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Document and Entity Information - shares	6 Months Ended
Document and Entity Information - shares	Jun. 30, 2016	Aug. 01, 2016
Document Information [Line Items]
Entity Registrant Name	SL GREEN REALTY CORP
Entity Central Index Key	0001040971
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Jun. 30, 2016
Document Fiscal Year Focus	2016
Document Fiscal Period Focus (Q1,Q2,Q3,FY)	Q2
Amendment Flag	false
Entity Common Stock, Shares Outstanding		100,319,785
SL Green Operating Partnership
Document Information [Line Items]
Entity Registrant Name	SL GREEN OPERATING PARTNERSHIP, LP.
Entity Central Index Key	0001492869
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Document Type	10-Q
Document Period End Date	Jun. 30, 2016
Document Fiscal Year Focus	2016
Document Fiscal Period Focus (Q1,Q2,Q3,FY)	Q2
Amendment Flag	false
Entity Common Stock, Shares Outstanding		1,497,718

Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Commercial real estate properties, at cost:
Land and land interests	$ 4,108,821	$ 4,779,159
Building and improvements	9,362,614	10,423,739
Building leasehold and improvements	1,435,255	1,431,259
Properties under capital lease	47,445	47,445
Total commercial real estate properties, at cost	14,954,135	16,681,602
Less: accumulated depreciation	(2,166,059)	(2,060,706)
Total commercial real estate properties, net	12,788,076	14,620,896
Assets held for sale	39,642	34,981
Cash and cash equivalents	276,226	255,399
Restricted cash	166,905	233,578
Investments in marketable securities	39,339	45,138
Tenant and other receivables, net of allowance of $18,728 and $17,618 in 2016 and 2015, respectively	57,551	63,491
Related party receivables	13,059	10,650
Deferred rents receivable, net of allowance of $22,917 and $21,730 in 2016 and 2015, respectively	443,981	498,776
Debt and preferred equity investments, net of discounts and deferred origination fees of $14,329 and $18,759 in 2016 and 2015, respectively	1,357,181	1,670,020
Investments in unconsolidated joint ventures	1,126,486	1,203,858
Deferred costs, net	256,303	239,920
Other assets	979,474	850,939
Total assets	17,544,223	19,727,646
Liabilities
Mortgages and other loans payable, net	5,524,110	6,881,920
Revolving credit facility, net	277,420	985,055
Term loan and senior unsecured notes, net	2,060,690	2,308,478
Accrued interest payable	36,378	42,406
Other liabilities	243,011	168,477
Accounts payable and accrued expenses	189,690	196,213
Deferred revenue	384,145	399,102
Capital lease obligations	41,751	41,360
Deferred land leases payable	2,236	1,783
Dividend and distributions payable	80,555	79,790
Security deposits	68,199	68,023
Liabilities related to assets held for sale	7	29,000
Junior subordinated deferrable interest debentures held by trusts that issued trust preferred securities	100,000	100,000
Total liabilities	9,008,192	11,301,607
Commitments and contingencies
Noncontrolling interests in Operating Partnership	486,452	424,206
Preferred units	302,460	282,516
Equity
Common stock, $0.01 par value, 160,000 shares authorized and 100,164 and 100,063 issued and outstanding at June 30, 2016 and December 31, 2015, respectively (including 87 shares held in treasury at June 30, 2016 and December 31, 2015)	1,003	1,001
Additional paid-in-capital	5,466,593	5,439,735
Treasury stock at cost	(10,000)	(10,000)
Accumulated other comprehensive loss	(16,558)	(8,749)
Retained earnings	1,655,320	1,643,546
Total SL Green stockholders' equity	7,318,290	7,287,465
Noncontrolling interests in other partnerships	428,829	431,852
Total equity	7,747,119	7,719,317
SL Green stockholders equity:
Total liabilities and equity/capital	17,544,223	19,727,646
Series I Preferred Stock
Equity
Series I Preferred Stock, $0.01 par value, $25.00 liquidation preference, 9,200 issued and outstanding at both June 30, 2016 and December 31, 2015	221,932	221,932
SL Green Operating Partnership
Commercial real estate properties, at cost:
Land and land interests	4,108,821	4,779,159
Building and improvements	9,362,614	10,423,739
Building leasehold and improvements	1,435,255	1,431,259
Properties under capital lease	47,445	47,445
Total commercial real estate properties, at cost	14,954,135	16,681,602
Less: accumulated depreciation	(2,166,059)	(2,060,706)
Total commercial real estate properties, net	12,788,076	14,620,896
Assets held for sale	39,642	34,981
Cash and cash equivalents	276,226	255,399
Restricted cash	166,905	233,578
Investments in marketable securities	39,339	45,138
Tenant and other receivables, net of allowance of $18,728 and $17,618 in 2016 and 2015, respectively	57,551	63,491
Related party receivables	13,059	10,650
Deferred rents receivable, net of allowance of $22,917 and $21,730 in 2016 and 2015, respectively	443,981	498,776
Debt and preferred equity investments, net of discounts and deferred origination fees of $14,329 and $18,759 in 2016 and 2015, respectively	1,357,181	1,670,020
Investments in unconsolidated joint ventures	1,126,486	1,203,858
Deferred costs, net	256,303	239,920
Other assets	979,474	850,939
Total assets	17,544,223	19,727,646
Liabilities
Mortgages and other loans payable, net	5,524,110	6,881,920
Revolving credit facility, net	277,420	985,055
Term loan and senior unsecured notes, net	2,060,690	2,308,478
Accrued interest payable	36,378	42,406
Other liabilities	243,011	168,477
Accounts payable and accrued expenses	189,690	196,213
Deferred revenue	384,145	399,102
Capital lease obligations	41,751	41,360
Deferred land leases payable	2,236	1,783
Dividend and distributions payable	80,555	79,790
Security deposits	68,199	68,023
Liabilities related to assets held for sale	7	29,000
Junior subordinated deferrable interest debentures held by trusts that issued trust preferred securities	100,000	100,000
Total liabilities	9,008,192	11,301,607
Commitments and contingencies
Noncontrolling interests in Operating Partnership	486,452	424,206
Limited partner interests in SLGOP (4,504 and 3,746 limited partner common units outstanding at June 30, 2016 and December 31, 2015, respectively)	486,452	424,206
Preferred units	302,460	282,516
SL Green stockholders equity:
SL Green partners' capital (1,041 and 1,035 general partner common units and 99,041 and 98,941 limited partner common units outstanding at June 30, 2016 and December 31, 2015, respectively)	7,112,916	7,074,282
Total SLGOP partners' capital	7,318,290	7,287,465
Noncontrolling interests in other partnerships	428,829	431,852
Total capital	7,747,119	7,719,317
Total liabilities and equity/capital	17,544,223	19,727,646
SL Green Operating Partnership \| Series I Preferred Stock
SL Green stockholders equity:
Series I Preferred Units, $25.00 liquidation preference, 9,200 issued and outstanding at both June 30, 2016 and December 31, 2015	$ 221,932	$ 221,932

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Tenant and other receivables, allowance	$ 18,728	$ 17,618
Deferred rents receivable, allowance	22,917	21,730
Debt and preferred equity investments, discount and deferred origination fees	$ 14,329	$ 18,759
Preferred stock, par value (in dollars per share)	$ 0.01
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	160,000,000	160,000,000
Common stock, shares issued (in shares)	100,164,000	100,063,000
Common stock, shares outstanding (in shares)	100,164,000	100,063,000
Treasury stock, shares (in shares)	87,000	87,000
Series I Preferred Stock
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, liquidation preference (in dollars per share)	$ 25.00	$ 25.00
Preferred stock, shares issued (in shares)	9,200,000	9,200,000
Preferred stock, shares outstanding (in shares)	9,200,000	9,200,000
SL Green Operating Partnership
Tenant and other receivables, allowance	$ 18,728	$ 17,618
Deferred rents receivable, allowance	22,917	21,730
Debt and preferred equity investments, discount and deferred origination fees	$ 14,329	$ 18,759
Limited partner interests in Operating Partnership, limited partner common units outstanding (shares)	4,504,000	3,746,000
SL Green partner's capital, general partner common units outstanding (shares)	1,041,000	1,035,000
SL Green partners' capital, limited partner common units outstanding (shares)	99,041,000	98,941,000
SL Green Operating Partnership \| Series I Preferred Stock
Preferred units, liquidation preference (in dollars per share)	$ 25.00	$ 25.00
Preferred units, shares issued	9,200,000	9,200,000
Preferred units, shares outstanding	9,200,000	9,200,000

Consolidated Statements of Operations - USD ($)	3 Months Ended		6 Months Ended
Consolidated Statements of Operations - USD ($)	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Revenues
Rental revenue, net	$ 416,809,000	$ 304,226,000	$ 762,416,000	$ 607,555,000
Escalation and reimbursement	48,616,000	41,407,000	94,227,000	82,376,000
Investment income	44,214,000	45,191,000	98,951,000	87,260,000
Other income	107,975,000	18,250,000	117,464,000	28,182,000
Total revenues	617,614,000	409,074,000	1,073,058,000	805,373,000
Expenses
Operating expenses, including $6,667 and $10,129 in 2016 and $4,472 and $8,189 in 2015 of related party expenses	75,324,000	70,114,000	154,844,000	146,891,000
Real estate taxes	62,124,000	56,286,000	123,798,000	112,009,000
Ground rent	8,307,000	8,086,000	16,615,000	16,274,000
Interest expense, net of interest income	89,089,000	75,746,000	183,761,000	151,553,000
Amortization of deferred financing costs	7,433,000	5,952,000	15,365,000	12,567,000
Depreciation and amortization	425,042,000	199,565,000	604,350,000	307,902,000
Transaction related costs	2,115,000	3,067,000	3,394,000	4,210,000
Marketing, general and administrative	24,484,000	23,200,000	48,516,000	48,664,000
Total expenses	693,918,000	442,016,000	1,150,643,000	800,070,000
(Loss) income from continuing operations before equity in net income from unconsolidated joint ventures, equity in net gain on sale of interest in unconsolidated joint venture/real estate, gain on sale of real estate, net, depreciable real estate reserves, loss on sale of investment in marketable securities and loss on early extinguishment of debt	(76,304,000)	(32,942,000)	(77,585,000)	5,303,000
Equity in net income from unconsolidated joint ventures	5,841,000	2,994,000	15,937,000	7,024,000
Equity in net gain on sale of interest in unconsolidated joint venture/real estate	33,448,000	769,000	43,363,000	769,000
Gain on sale of real estate, net	196,580,000	0	210,353,000.00	0
Depreciable real estate reserves	(10,387,000)	0	(10,387,000)	0
Loss on sale of investment in marketable securities	(83,000)	0	(83,000)	0
Loss on early extinguishment of debt	0	0	0	(49,000)
Income (loss) from continuing operations	149,095,000	(29,179,000)	181,598,000	13,047,000
Net income (loss) from discontinued operations	0	0	0	427,000
Gain on sale of discontinued operations	0	0	0	12,983,000
Net income (loss)	149,095,000	(29,179,000)	181,598,000	26,457,000
Net income attributable to noncontrolling interests:
Noncontrolling interests in the Operating Partnership	(5,586,000)	1,577,000	(6,508,000)	(166,000)
Net income attributable to noncontrolling interests	(3,435,000)	(6,626,000)	(5,409,000)	(12,553,000)
Preferred units distributions	(2,880,000)	(1,140,000)	(5,528,000)	(2,091,000)
Net income (loss) attributable to SL Green/SLGOP	137,194,000	(35,368,000)	164,153,000	11,647,000
Perpetual preferred stock dividends	(3,737,000)	(3,738,000)	(7,475,000)	(7,476,000)
Amounts attributable to SL Green common stockholders:
(Loss) income from continuing operations before purchase price fair value adjustment, gains on sale and discontinued operations	(77,056,000)	(39,846,000)	(76,947,000)	(9,467,000)
Equity in net gain on sale of interest in unconsolidated joint venture/real estate	32,058,000	740,000	41,634,000	740,000
Net income from discontinued operations	0	0	0	411,000
Gain on sale of discontinued operations	0	0	0	12,487,000
Gain on sale of real estate	188,410,000	0	201,964,000	0
Depreciable real estate reserves	(9,955,000)	0	(9,973,000)	0
Net income (loss) attributable to SL Green common stockholders	$ 133,457,000	$ (39,106,000)	$ 156,678,000	$ 4,171,000
Basic earnings per share:
(Loss) income from continuing operations before purchase price fair value adjustment, gains on sale and discontinued operations (usd per share)	$ (0.77)	$ (0.40)	$ (0.77)	$ (0.10)
Equity in net gain on sale of interest in unconsolidated joint venture/real estate (usd per share)	0.32	0.01	0.42	0.01
Gain on sale of discontinued operations (usd per share)	0.00	0.00	0.00	0.13
Gain on sale of real estate (in dollars per share)	1.88	0.00	2.02	0.00
Depreciable Real Estate Reserves, Effect on Earnings, Per Basic Share	(0.10)	0.00	(0.10)	0.00
Net income attributable to SL Green common stockholders (usd per share)	1.33	(0.39)	1.57	0.04
Diluted earnings per share:
(Loss) income from continuing operations before purchase price fair value adjustment, gains on sale and discontinued operations (usd per share)	(0.77)	(0.40)	(0.77)	(0.10)
Equity in net gain on sale of interest in unconsolidated joint venture/real estate (usd per share)	0.32	0.01	0.42	0.01
Gain on sale of discontinued operations (usd per share)	0.00	0.00	0.00	0.13
Gain on sale of real estate (in dollars per share)	1.88	0.00	2.01	0.00
Depreciable real estate reserves (in dollars per share)	(0.10)	0.00	(0.10)	0.00
Net income attributable to SL Green common stockholders (usd per share)	1.33	(0.39)	1.56	0.04
Dividends per share/unit (usd per share)	$ 0.72	$ 0.60	$ 1.44	$ 1.20
Basic weighted average common shares outstanding (in shares)	100,134,000	99,579,000	100,093,000	98,994,000
Diluted weighted average common shares and common share equivalents outstanding (in shares)	104,792,000	99,579,000	104,533,000	103,423,000
SL Green Operating Partnership
Revenues
Rental revenue, net	$ 416,809,000	$ 304,226,000	$ 762,416,000	$ 607,555,000
Escalation and reimbursement	48,616,000	41,407,000	94,227,000	82,376,000
Investment income	44,214,000	45,191,000	98,951,000	87,260,000
Other income	107,975,000	18,250,000	117,464,000	28,182,000
Total revenues	617,614,000	409,074,000	1,073,058,000	805,373,000
Expenses
Operating expenses, including $6,667 and $10,129 in 2016 and $4,472 and $8,189 in 2015 of related party expenses	75,324,000	70,114,000	154,844,000	146,891,000
Real estate taxes	62,124,000	56,286,000	123,798,000	112,009,000
Ground rent	8,307,000	8,086,000	16,615,000	16,274,000
Interest expense, net of interest income	89,089,000	75,746,000	183,761,000	151,553,000
Amortization of deferred financing costs	7,433,000	5,952,000	15,365,000	12,567,000
Depreciation and amortization	425,042,000	199,565,000	604,350,000	307,902,000
Transaction related costs	2,115,000	3,067,000	3,394,000	4,210,000
Marketing, general and administrative	24,484,000	23,200,000	48,516,000	48,664,000
Total expenses	693,918,000	442,016,000	1,150,643,000	800,070,000
(Loss) income from continuing operations before equity in net income from unconsolidated joint ventures, equity in net gain on sale of interest in unconsolidated joint venture/real estate, gain on sale of real estate, net, depreciable real estate reserves, loss on sale of investment in marketable securities and loss on early extinguishment of debt	(76,304,000)	(32,942,000)	(77,585,000)	5,303,000
Equity in net income from unconsolidated joint ventures	5,841,000	2,994,000	15,937,000	7,024,000
Equity in net gain on sale of interest in unconsolidated joint venture/real estate	33,448,000	769,000	43,363,000	769,000
Gain on sale of real estate, net	196,580,000	0	210,353,000	0
Depreciable real estate reserves	(10,387,000)	0	(10,387,000)	0
Loss on sale of investment in marketable securities	(83,000)	0	(83,000)	0
Loss on early extinguishment of debt	0	0	0	(49,000)
Income (loss) from continuing operations	149,095,000	(29,179,000)	181,598,000	13,047,000
Net income (loss) from discontinued operations	0	0	0	427,000
Gain on sale of discontinued operations	0	0	0	12,983,000
Net income (loss)	149,095,000	(29,179,000)	181,598,000	26,457,000
Net income attributable to noncontrolling interests:
Noncontrolling interests in the Operating Partnership			(6,508,000)
Net income attributable to noncontrolling interests	(3,435,000)	(6,626,000)	(5,409,000)	(12,553,000)
Preferred units distributions	(2,880,000)	(1,140,000)	(5,528,000)	(2,091,000)
Net income (loss) attributable to SL Green/SLGOP	142,780,000	(36,945,000)	170,661,000	11,813,000
Perpetual preferred unit distributions	(3,737,000)	(3,738,000)	(7,475,000)	(7,476,000)
Net income (loss) attributable to SLGOP common unitholders	139,043,000	(40,683,000)	163,186,000	4,337,000
Amounts attributable to SL Green common stockholders:
(Loss) income from continuing operations before purchase price fair value adjustment, gains on sale and discontinued operations	(80,598,000)	(41,452,000)	(80,143,000)	(9,842,000)
Equity in net gain on sale of interest in unconsolidated joint venture/real estate	33,448,000	769,000	43,363,000	769,000
Net income from discontinued operations	0	0	0	427,000
Gain on sale of discontinued operations	0	0	0	12,983,000
Gain on sale of real estate	196,580,000	0	210,353,000	0
Depreciable real estate reserves	(10,387,000)	0	(10,387,000)	0
Net income (loss) attributable to SL Green common stockholders	$ 139,043,000	$ (40,683,000)	$ 163,186,000	$ 4,337,000
Basic earnings per share:
(Loss) income from continuing operations before gains on sale and discontinued operations (usd per share)	$ (0.77)	$ (0.40)	$ (0.77)	$ (0.10)
Equity in net gain on sale of interest in unconsolidated joint venture/real estate (usd per share)	0.32	0.01	0.42	0.01
Net income from discontinued operations (usd per share)	0.00	0.00	0.00	0.00
Gain on sale of discontinued operations (usd per share)	0.00	0.00	0.00	0.13
Gain on sale of real estate (in dollars per share)	1.88	0.00	2.02	0.00
Depreciable Real Estate Reserves, Effect on Earnings, Per Basic Share	(0.10)	0.00	(0.10)	0.00
Net income attributable to SLGOP common unitholders (usd per share)	1.33	(0.39)	1.57	0.04
Diluted earnings per share:
(Loss) income from continuing operations before gains on sale and discontinued operations (in usd per share)	(0.77)	(0.40)	(0.77)	(0.10)
Equity in net gain on sale of interest in unconsolidated joint venture/real estate (usd per share)	0.32	0.01	0.42	0.01
Gain on sale of discontinued operations (usd per share)	0.00	0.00	0.00	0.13
Gain on sale of real estate (in dollars per share)	1.88	0.00	2.01	0.00
Depreciable real estate reserves (in dollars per share)	(0.10)	0.00	(0.10)	0.00
Net income attributable to SLGOP common unitholders (usd per share)	1.33	(0.39)	1.56	0.04
Dividends per share/unit (usd per share)	$ 0.72	$ 0.60	$ 1.44	$ 1.20
Basic weighted average common shares outstanding (in shares)	104,476,000	103,487,000	104,251,000	102,930,000
Basic weighted average common units outstanding (in shares)	104,476	103,487	104,251	102,930
Diluted weighted average common units and common unit equivalents outstanding (in shares)	104,792	103,487	104,533	103,423

Consolidated Statements of Operations (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Operating expenses, paid to related parties	$ 6,667	$ 4,472	$ 10,129	$ 8,189
SL Green Operating Partnership
Operating expenses, paid to related parties	$ 6,667	$ 4,472	$ 10,129	$ 8,189

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Net income (loss)	$ 149,095	$ (29,179)	$ 181,598	$ 26,457
Other comprehensive income (loss):
Change in net unrealized gain (loss) on derivative instruments, including SL Green's/SLGOP's share of joint venture net unrealized (loss) gain on derivative instruments	257	2,250	(7,315)	(3,430)
Change in unrealized gain (loss) on marketable securities	354	(1,304)	(869)	(654)
Other comprehensive income (loss)	611	946	(8,184)	(4,084)
Comprehensive income (loss)	149,706	(28,233)	173,414	22,373
Net income (loss) attributable to noncontrolling interests and preferred units distributions	(11,901)	(6,189)	(17,445)	(14,810)
Other comprehensive income (loss) attributable to noncontrolling interests	53	(42)	375	158
Comprehensive income attributable to SL Green/SLGOP	137,858	(34,464)	156,344	7,721
SL Green Operating Partnership
Net income (loss)	149,095	(29,179)	181,598	26,457
Other comprehensive income (loss):
Change in net unrealized gain (loss) on derivative instruments, including SL Green's/SLGOP's share of joint venture net unrealized (loss) gain on derivative instruments	257	2,250	(7,315)	(3,430)
Change in unrealized gain (loss) on marketable securities	354	(1,304)	(869)	(654)
Other comprehensive income (loss)	611	946	(8,184)	(4,084)
Comprehensive income (loss)	149,706	(28,233)	173,414	22,373
Net income (loss) attributable to noncontrolling interests and preferred units distributions	(3,435)	(6,626)	(5,409)	(12,553)
Other comprehensive income (loss) attributable to noncontrolling interests	53	(42)	375	158
Comprehensive income attributable to SL Green/SLGOP	$ 146,324	$ (34,901)	$ 168,380	$ 9,978

Consolidated Statement of Equity - 6 months ended Jun. 30, 2016 - USD ($) $ in Thousands	Total	Common Stock	Additional Paid- In-Capital	Treasury Stock	Accumulated Other Comprehensive Income (Loss)	Retained Earnings	Noncontrolling Interests
Beginning Balance at Dec. 31, 2015	$ 7,719,317	$ 1,001	$ 5,439,735	$ (10,000)	$ (8,749)	$ 1,643,546	$ 431,852
Beginning Balance (in shares) at Dec. 31, 2015		99,976,000
Increase (Decrease) in Stockholders' Equity
Net income	169,562					164,153	5,409
Other comprehensive loss	(7,809)				(7,809)
Preferred dividends	(7,475)					(7,475)
DRSPP proceeds (in shares)		1,000
DRSPP proceeds	89		89
Conversion of units of the Operating Partnership to common stock (in shares)		109,000
Conversion of units of the Operating Partnership to common stock	11,795	$ 1	11,794
Reallocation of noncontrolling interest in the Operating Partnership	(906)					(906)
Deferred compensation plan and stock award, net (in shares)		4,000
Deferred compensation plan and stock award, net	(2,150)		(2,150)
Amortization of deferred compensation plan	12,823		12,823
Issuance of common stock	(40)		(40)
Proceeds from stock options exercised (in shares)		74,000
Proceeds from stock options exercised	4,343	$ 1	4,342
Contributions to consolidated joint venture interests	1,434						1,434
Cash distributions to noncontrolling interests	(9,866)						(9,866)
Cash distributions declared ($1.44 per common share, none of which represented a return of capital for federal income tax purposes)	(143,998)					(143,998)
Ending Balance at Jun. 30, 2016	$ 7,747,119	$ 1,003	$ 5,466,593	$ (10,000)	$ (16,558)	$ 1,655,320	$ 428,829
Ending Balance (in shares) at Jun. 30, 2016		100,164,000

Consolidated Statement of Equity (Parenthetical) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Statement of Stockholders' Equity [Abstract]
Cash distribution declared, per common share (in dollars per share)	$ 0.72	$ 0.60	$ 1.44	$ 1.20

Consolidated Statement of Capital $ in Thousands	6 Months Ended
Consolidated Statement of Capital $ in Thousands	Jun. 30, 2016 USD ($) shares
Increase (Decrease) in Partner's Capital
DRSPP proceeds	$ 89
Conversion of common units	11,795
Reallocation of noncontrolling interests in the operating partnership	(906)
Deferred compensation plan and stock award, net	(2,150)
Amortization of deferred compensation plan	12,823
Contribution to consolidated joint venture interests	1,434
Cash distributions to noncontrolling interests	$ (9,866)
Common Stock
Increase (Decrease) in Partner's Capital
DRSPP proceeds (in shares) \| shares	1,000
Conversion of common units	$ 1
Deferred compensation plan and stock award, net (in shares) \| shares	4,000
Contributions - proceeds from stock options exercised (in shares) \| shares	74,000
Noncontrolling Interests
Increase (Decrease) in Partner's Capital
Contribution to consolidated joint venture interests	$ 1,434
Cash distributions to noncontrolling interests	(9,866)
SL Green Operating Partnership
Increase (Decrease) in Partner's Capital
Beginning Balance	7,719,317
Net income	169,562
Other comprehensive (loss)	(7,809)
Preferred distributions	(7,475)
DRSPP proceeds	89
Conversion of common units	11,755
Reallocation of noncontrolling interests in the operating partnership	(906)
Deferred compensation plan and stock award, net	(2,150)
Amortization of deferred compensation plan	12,823
Contribution to consolidated joint venture interests	1,434
Contributions - proceeds from stock options exercised	4,343
Cash distributions to noncontrolling interests	(9,866)
Cash distributions declared ($1.44 per common unit, none of which represented a return of capital for federal income tax purposes)	(143,998)
Ending Balance	7,747,119
SL Green Operating Partnership \| Preferred Units \| Series C Preferred Stock
Increase (Decrease) in Partner's Capital
Beginning Balance
Ending Balance
SL Green Operating Partnership \| Preferred Units \| Series I Preferred Stock
Increase (Decrease) in Partner's Capital
Beginning Balance	221,932
Ending Balance	221,932
SL Green Operating Partnership \| Common Stock \| Partners' Interest
Increase (Decrease) in Partner's Capital
Beginning Balance	$ 7,074,282
Beginning Balance (units) \| shares	99,976,000
Net income	$ 164,153
Preferred distributions	$ (7,475)
DRSPP proceeds (in shares) \| shares	1,000
DRSPP proceeds	$ 89
Conversion of common units (in shares) \| shares	109,000
Conversion of common units	$ 11,755
Reallocation of noncontrolling interests in the operating partnership	$ (906)
Deferred compensation plan and stock award, net (in shares) \| shares	4,000
Deferred compensation plan and stock award, net	$ (2,150)
Amortization of deferred compensation plan	$ 12,823
Contributions - proceeds from stock options exercised (in shares) \| shares	74,000
Contributions - proceeds from stock options exercised	$ 4,343
Cash distributions declared ($1.44 per common unit, none of which represented a return of capital for federal income tax purposes)	(143,998)
Ending Balance	$ 7,112,916
Ending Balance (units) \| shares	100,164,000
SL Green Operating Partnership \| Accumulated Other Comprehensive Income (Loss)
Increase (Decrease) in Partner's Capital
Beginning Balance	$ (8,749)
Other comprehensive (loss)	(7,809)
Ending Balance	(16,558)
SL Green Operating Partnership \| Noncontrolling Interests
Increase (Decrease) in Partner's Capital
Beginning Balance	431,852
Net income	5,409
Contribution to consolidated joint venture interests	1,434
Cash distributions to noncontrolling interests	(9,866)
Ending Balance	$ 428,829

Consolidated Statement of Capital (Parenthetical) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Cash distribution declared, per common share (in dollars per share)	$ 0.72	$ 0.60	$ 1.44	$ 1.20
SL Green Operating Partnership
Cash distribution declared, per common share (in dollars per share)	$ 0.72	$ 0.60	$ 1.44	$ 1.20

Consolidated Statements of Cash Flows - USD ($)

3 Months Ended

6 Months Ended

12 Months Ended

Jun. 30, 2016

Jun. 30, 2015

Jun. 30, 2016

Jun. 30, 2015

Dec. 31, 2015

Operating Activities

Net income (loss)

$ 149,095,000

$ (29,179,000)

$ 181,598,000

$ 26,457,000

Adjustments to reconcile net income to net cash provided by operating activities:

Depreciation and amortization

619,715,000

320,472,000

Equity in net income from unconsolidated joint ventures

(5,841,000)

(2,994,000)

(15,937,000)

(7,024,000)

Distributions of cumulative earnings from unconsolidated joint ventures

15,260,000

22,464,000

Equity in net gain on sale of interest in unconsolidated joint venture interest/real estate

(33,448,000)

(769,000)

(43,363,000)

(769,000)

Depreciable real estate reserves

10,387,000

Gain on sale of real estate

(196,580,000)

(210,353,000.00)

Gain on sale of discontinued operations

(12,983,000)

Loss on sale of investment in marketable securities

83,000

Loss on early extinguishment of debt

49,000

Deferred rents receivable

53,042,000

(65,260,000)

Other non-cash adjustments

(164,276,000)

^[1]

(3,592,000)

Changes in operating assets and liabilities:

Restricted cash—operations

(10,069,000)

(1,246,000)

Tenant and other receivables

4,820,000

(6,826,000)

Related party receivables

(2,386,000)

340,000

Deferred lease costs

(31,951,000)

(35,918,000)

Other assets

4,362,000

11,410,000

Accounts payable, accrued expenses and other liabilities and security deposits

(33,635,000)

(16,987,000)

Deferred revenue and land leases payable

(3,919,000)

2,872,000

Net cash provided by operating activities

373,378,000

233,459,000

Investing Activities

Acquisitions of real estate property

(37,728,000)

(42,556,000)

Additions to land, buildings and improvements

(157,118,000)

(122,520,000)

Escrowed cash—capital improvements/acquisition deposits/deferred purchase price

76,220,000

(229,853,000)

Investments in unconsolidated joint ventures

(25,389,000)

(109,135,000)

Distributions in excess of cumulative earnings from unconsolidated joint ventures

161,413,000

49,059,000

Net proceeds from disposition of real estate/joint venture interest

1,916,312,000

491,598,000

Proceeds from sale of marketable securities

5,180,000

295,000

Purchases of marketable securities

(331,000)

(7,769,000)

Other investments

(2,987,000)

(9,620,000)

Origination of debt and preferred equity investments

(227,196,000)

(387,216,000)

Repayments or redemption of debt and preferred equity investments

418,371,000

109,784,000

Net cash provided by investing activities

2,126,747,000

(257,933,000)

Financing Activities

Proceeds from mortgages and other loans payable

250,514,000

106,421,000

Repayments of mortgages and other loans payable

(1,663,616,000)

(489,138,000)

Proceeds from revolving credit facility and senior unsecured notes

700,000,000

1,055,000,000

Repayments of revolving credit facility and senior unsecured notes

(1,664,296,000)

(735,007,000)

Proceeds from stock options exercised and DRIP issuance

4,431,000

111,307,000

Proceeds from sale of common stock

124,999,000

Redemption of preferred stock

(2,849,000)

(200,000)

Distributions to noncontrolling interests in other partnerships

(9,866,000)

(111,715,000)

Contributions from noncontrolling interests in other partnerships

1,434,000

8,655,000

Distributions to noncontrolling interests in the Operating Partnership

(6,009,000)

(4,693,000)

Dividends/Distributions paid on common and preferred stock/units

(156,234,000)

(127,310,000)

Other obligations related to mortgage loan participations

76,500,000

25,000,000

Deferred loan costs and capitalized lease obligation

(9,307,000)

(4,358,000)

Net cash used in financing activities

(2,479,298,000)

(41,039,000)

Net increase in cash and cash equivalents

20,827,000

(65,513,000)

Cash and cash equivalents at beginning of year

255,399,000

281,409,000

$ 281,409,000

Cash and cash equivalents at end of period

276,226,000

215,896,000

276,226,000

215,896,000

255,399,000

Supplemental Disclosure of Non-Cash Investing and Financing Activities:

Issuance of units in the operating partnership relating to the investment in unconsolidated joint ventures

51,647,000

Redemption of units in the operating partnership

11,795,000

37,992,000

Derivative instruments at fair value

7,701,000

2,000,000

Exchange of debt investment for equity in joint venture

68,581,000

10,151,000

Transfer of restricted cash to operating cash and cash equivalents as a result of sale

21,578,000

Acquisition of subsidiary interest from noncontrolling interest

20,630,000

Tenant improvements and capital expenditures payable

11,637,000

17,661,000

Fair value adjustment to noncontrolling interest in operating partnership

906,000

20,670,000

Capital lease assets

Transfer of assets to assets held for sale

1,931,217,000

420,569,000

Transfer of liabilities related to assets held for sale

1,612,008,000

178,252,000

Deferred leasing payable

1,222,000

5,525,000

Removal of fully depreciated commercial real estate properties

13,471,000

SL Green Operating Partnership

Operating Activities

Net income (loss)

149,095,000

(29,179,000)

181,598,000

26,457,000

Adjustments to reconcile net income to net cash provided by operating activities:

Depreciation and amortization

619,715,000

320,472,000

Equity in net income from unconsolidated joint ventures

(5,841,000)

(2,994,000)

(15,937,000)

(7,024,000)

Distributions of cumulative earnings from unconsolidated joint ventures

15,260,000

22,464,000

Equity in net gain on sale of interest in unconsolidated joint venture interest/real estate

(33,448,000)

(769,000)

(43,363,000)

(769,000)

Depreciable real estate reserves

10,387,000

Gain on sale of real estate

(196,580,000)

(210,353,000)

Gain on sale of discontinued operations

(12,983,000)

Loss on sale of investment in marketable securities

83,000

Loss on early extinguishment of debt

49,000

Deferred rents receivable

53,042,000

(65,260,000)

Other non-cash adjustments

(164,276,000)

^[1]

(3,592,000)

Changes in operating assets and liabilities:

Restricted cash—operations

(10,069,000)

(1,246,000)

Tenant and other receivables

4,820,000

(6,826,000)

Related party receivables

(2,386,000)

340,000

Deferred lease costs

(31,951,000)

(35,918,000)

Other assets

4,362,000

11,410,000

Accounts payable, accrued expenses and other liabilities and security deposits

(33,635,000)

(16,987,000)

Deferred revenue and land leases payable

(3,919,000)

2,872,000

Net cash provided by operating activities

373,378,000

233,459,000

Investing Activities

Acquisitions of real estate property

(37,728,000)

(42,556,000)

Additions to land, buildings and improvements

(157,118,000)

(122,520,000)

Escrowed cash—capital improvements/acquisition deposits/deferred purchase price

76,220,000

(229,853,000)

Investments in unconsolidated joint ventures

(25,389,000)

(109,135,000)

Distributions in excess of cumulative earnings from unconsolidated joint ventures

161,413,000

49,059,000

Net proceeds from disposition of real estate/joint venture interest

1,916,312,000

491,598,000

Proceeds from sale of marketable securities

5,180,000

295,000

Purchases of marketable securities

(331,000)

(7,769,000)

Other investments

(2,987,000)

(9,620,000)

Origination of debt and preferred equity investments

(227,196,000)

(387,216,000)

Repayments or redemption of debt and preferred equity investments

418,371,000

109,784,000

Net cash provided by investing activities

2,126,747,000

(257,933,000)

Financing Activities

Proceeds from mortgages and other loans payable

250,514,000

106,421,000

Repayments of mortgages and other loans payable

(1,663,616,000)

(489,138,000)

Proceeds from revolving credit facility and senior unsecured notes

700,000,000

1,055,000,000

Repayments of revolving credit facility and senior unsecured notes

(1,664,296,000)

(735,007,000)

Proceeds from stock options exercised and DRIP issuance

4,431,000

111,307,000

Proceeds from sale of common stock

124,999,000

Redemption of preferred stock

(2,849,000)

(200,000)

Distributions to noncontrolling interests in other partnerships

(9,866,000)

(111,715,000)

Contributions from noncontrolling interests in other partnerships

1,434,000

8,655,000

Dividends/Distributions paid on common and preferred stock/units

(162,243,000)

(132,003,000)

Other obligations related to mortgage loan participations

76,500,000

25,000,000

Deferred loan costs and capitalized lease obligation

(9,307,000)

(4,358,000)

Net cash used in financing activities

(2,479,298,000)

(41,039,000)

Net increase in cash and cash equivalents

20,827,000

(65,513,000)

Cash and cash equivalents at beginning of year

255,399,000

281,409,000

Cash and cash equivalents at end of period

$ 276,226,000

$ 215,896,000

276,226,000

215,896,000

$ 255,399,000

Supplemental Disclosure of Non-Cash Investing and Financing Activities:

Issuance of units in the operating partnership relating to the investment in unconsolidated joint ventures

51,647,000

Redemption of units in the operating partnership

11,795,000

37,992,000

Derivative instruments at fair value

7,701,000

2,000,000

Exchange of debt investment for equity in joint venture

68,581,000

10,151,000

Transfer of restricted cash to operating cash and cash equivalents as a result of sale

21,578,000

Acquisition of subsidiary interest from noncontrolling interest

20,630,000

Tenant improvements and capital expenditures payable

11,637,000

17,661,000

Transfer of assets to assets held for sale

1,931,217,000

420,569,000

Transfer of liabilities related to assets held for sale

1,612,008,000

178,252,000

Deferred leasing payable

1,222,000

5,525,000

Removal of fully depreciated commercial real estate properties

13,471,000

Preferred Units

Supplemental Disclosure of Non-Cash Investing and Financing Activities:

Issuance of preferred units relating to the real estate acquisition

22,793,000

53,808,000

Preferred Units | SL Green Operating Partnership

Supplemental Disclosure of Non-Cash Investing and Financing Activities:

Issuance of preferred units relating to the real estate acquisition

$ 22,793,000

$ 53,808,000

[1]	Included in Other non-cash adjustments is $172.4 million for the six months ended June 30, 2016 for the amortization of the below-market lease at 388-390 Greenwich Street as a result of the tenant exercising their option to purchase the property and entering into an agreement to accelerate the sale

Consolidated Statements of Cash Flows (Parenthetical) $ in Millions	6 Months Ended
	Jun. 30, 2016 USD ($)
Amortization of acquired leases	$ 191.6
388-390 Greenwich Street
Amortization of acquired leases	172.4
SL Green Operating Partnership \| 388-390 Greenwich Street
Amortization of acquired leases	$ 172.4

Organization and Basis of Presentation

6 Months Ended

Jun. 30, 2016

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Organization and Basis of Presentation

SL Green Realty Corp., which is referred to as the Company or SL Green, a Maryland corporation, and SL Green Operating Partnership, L.P., which is referred to as SLGOP or the Operating Partnership, a Delaware limited partnership, were formed in June 1997 for the purpose of combining the commercial real estate business of S.L. Green Properties, Inc. and its affiliated partnerships and entities. The Operating Partnership received a contribution of interest in the real estate properties, as well as 95% of the economic interest in the management, leasing and construction companies which are referred to as the Service Corporation. All of the management, leasing and construction services that are provided to the properties that are wholly-owned by us and that are provided to certain joint ventures are conducted through SL Green Management LLC which is 100% owned by the Operating Partnership. The Company has qualified, and expects to qualify in the current fiscal year, as a real estate investment trust, or REIT, under the Internal Revenue Code of 1986, as amended, or the Code, and operates as a self-administered, self-managed REIT. A REIT is a legal entity that holds real estate interests and, through payments of dividends to stockholders, is permitted to minimize the payment of Federal income taxes at the corporate level. Unless the context requires otherwise, all references to "we," "our" and "us" means the Company and all entities owned or controlled by the Company, including the Operating Partnership.

Substantially all of our assets are held by, and all of our operations are conducted through, the Operating Partnership. The Company is the sole managing general partner of the Operating Partnership. As of June 30, 2016, noncontrolling investors held, in the aggregate, a 4.30% limited partnership interest in the Operating Partnership. We refer to these interests as the noncontrolling interests in the Operating Partnership. The Operating Partnership is considered a variable interest entity, or VIE, in which we are the primary beneficiary. See Note 11, "Noncontrolling Interests on the Company's Consolidated Financial Statements."

Reckson Associates Realty Corp., or Reckson, and Reckson Operating Partnership, L.P., or ROP, are wholly-owned subsidiaries of SL Green Realty Corp.

As of June 30, 2016, we owned the following interests in properties in the New York Metropolitan area, primarily in midtown Manhattan. Our investments in the New York Metropolitan area also include investments in Brooklyn, Long Island, Westchester County, Connecticut and New Jersey, which are collectively known as the Suburban properties:



		Consolidated			Unconsolidated		Total
Location	Property Type	Number of Properties		Approximate Square Feet (unaudited)	Number of Properties	Approximate Square Feet (unaudited)	Number of Properties	Approximate Square Feet (unaudited)	Weighted Average Occupancy(1) (unaudited)
Commercial:
Manhattan	Office	25		18,368,606	6	4,244,139	31	22,612,745	95.6	%
	Retail	10	(2)	418,563	9	352,952	19	771,515	87.8	%
	Development/Redevelopment	3		42,635	3	767,311	6	809,946	34.9	%
	Fee Interest	1		176,530	—	—	1	176,530	100.0	%
		39		19,006,334	18	5,364,402	57	24,370,736	93.4	%
Suburban	Office	26	(3)	4,235,300	2	640,000	28	4,875,300	82.1	%
	Retail	1		52,000	—	—	1	52,000	100.0	%
	Development/Redevelopment	1		1,000	1	—	2	1,000	100.0	%
		28		4,288,300	3	640,000	31	4,928,300	82.3	%
Total commercial properties		67		23,294,634	21	6,004,402	88	29,299,036	91.5	%
Residential:
Manhattan	Residential	4	(2)	762,587	17	2,957,282	21	3,719,869	67.5	%
Suburban	Residential	—		—	—	—	—	—	—	%
Total residential properties		4		762,587	17	2,957,282	21	3,719,869	67.5	%
Total portfolio⁽³⁾		71		24,057,221	38	8,961,684	109	33,018,905	88.8	%


(1)	The weighted average occupancy for commercial properties represents the total occupied square feet divided by the total acquisition square footage. The weighted average occupancy for residential properties represents the total occupied units divided by the total available units.


(2)	As of June 30, 2016, we owned a building that was comprised of approximately 270,132 square feet (unaudited) of retail space and approximately 222,855 square feet (unaudited) of residential space. For the purpose of this report, we have included the building in the retail properties count and have bifurcated the square footage into the retail and residential components.


(3)	Includes the property at 500 West Putnam, which is classified as held for sale at June 30, 2016.

As of June 30, 2016, we also managed an office building of approximately 336,000 square foot (unaudited), which is owned by a third party and held debt and preferred equity investments with a book value of $1.7 billion, including $0.3 billion of debt and preferred equity investments and other financing receivables that are included in other balance sheet line items.

Partnership Agreement

In accordance with the partnership agreement of the Operating Partnership, or the Operating Partnership Agreement, we allocate all distributions and profits and losses in proportion to the percentage of ownership interests of the respective partners. As the managing general partner of the Operating Partnership, we are required to take such reasonable efforts, as determined by us in our sole discretion, to cause the Operating Partnership to distribute sufficient amounts to enable the payment of sufficient dividends by us to minimize any Federal income or excise tax at the Company level. Under the Operating Partnership Agreement, each limited partner has the right to redeem units of limited partnership interests for cash, or if we so elect, shares of SL Green's common stock on a one-for-one basis.

Basis of Quarterly Presentation

The accompanying unaudited consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and notes required by accounting principles generally accepted in the United States for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for the fair presentation of the financial position of the Company and the Operating Partnership at June 30, 2016 and the results of operations for the periods presented have been included. The operating results for the period presented are not necessarily indicative of the results that may be expected for the year ending December 31, 2016. These financial statements should be read in conjunction with the financial statements and accompanying notes included in the Annual Report on Form 10-K for the year ended December 31, 2015 of the Company and the Operating Partnership.

The consolidated balance sheets at December 31, 2015 have been derived from the audited financial statements as of that date but do not include all the information and footnotes required by accounting principles generally accepted in the United States for complete financial statements.

Significant Accounting Policies

6 Months Ended

Jun. 30, 2016

Accounting Policies [Abstract]

Significant Accounting Policies

Principles of Consolidation

The consolidated financial statements include our accounts and those of our subsidiaries, which are wholly-owned or controlled by us. Entities which we do not control through our voting interest and entities which are variable interest entities, but where we are not the primary beneficiary, are accounted for under the equity method. See Note 5, "Debt and Preferred Equity Investments" and Note 6, "Investments in Unconsolidated Joint Ventures." All significant intercompany balances and transactions have been eliminated.

We consolidate a variable interest entity, or VIE, in which we are considered the primary beneficiary. The primary beneficiary is the entity that has (i) the power to direct the activities that most significantly impact the entity's economic performance and (ii) the obligation to absorb losses of the VIE or the right to receive benefits from the VIE that could be significant to the VIE. Included in commercial real estate properties on our consolidated balance sheets as of June 30, 2016 and December 31, 2015 are $1.5 billion and $200.7 million, respectively, related to our consolidated VIEs. Included in mortgages and other loans payable on our consolidated balance sheets as of June 30, 2016 and December 31, 2015 are $594.6 million and $101.1 million, respectively, collateralized by the real estate assets of the related consolidated VIEs. As of June 30, 2016, assets held for sale and liabilities related to assets held for sale on the consolidated balance sheets did not include amounts related to consolidated VIEs.

A noncontrolling interest in a consolidated subsidiary is defined as the portion of the equity (net assets) in a subsidiary not attributable, directly or indirectly, to us. Noncontrolling interests are required to be presented as a separate component of equity in the consolidated balance sheet and the presentation of net income is modified to present earnings and other comprehensive income attributed to controlling and noncontrolling interests.

We assess the accounting treatment for each joint venture and debt and preferred equity investment. This assessment includes a review of each joint venture or limited liability company agreement to determine which party has what rights and whether those rights are protective or participating. For all VIEs, we review such agreements in order to determine which party has the power to direct the activities that most significantly impact the entity's economic performance. In situations where we and our partner approve, among other things, the annual budget, receive a detailed monthly reporting package, meet on a quarterly basis to review the results of the joint venture, review and approve the joint venture's tax return before filing, and approve all leases that cover more than a nominal amount of space relative to the total rentable space at each property, we do not consolidate the joint venture as we consider these to be substantive participation rights that result in shared power of the activities that most significantly impact the performance of the joint venture. Our joint venture agreements typically contain certain protective rights such as requiring partner approval to sell, finance or refinance the property and the payment of capital expenditures and operating expenditures outside of the approved budget or operating plan.

Investment in Commercial Real Estate Properties

On a periodic basis, we assess whether there are any indications that the value of our real estate properties may be other than temporarily impaired or that their carrying value may not be recoverable. A property's value is considered impaired if management's estimate of the aggregate future cash flows (undiscounted) to be generated by the property is less than the carrying value of the property. To the extent impairment has occurred, the loss will be measured as the excess of the carrying amount of the property over the calculated fair value of the property.

We also evaluate our real estate properties for potential impairment when a real estate property has been classified as held for sale. Real estate assets held for sale are valued at the lower of either their carrying value or fair value less costs to sell. We do not believe that there were any indicators of impairment at any of our consolidated properties at June 30, 2016, except for 500 West Putnam Avenue in Greenwich, Connecticut for which we recorded a $10.4 million depreciable real estate reserve during the three months ended June 30, 2016.

We allocate the purchase price of real estate to land and building (inclusive of tenant improvements) and, if determined to be material, intangibles, such as the value of above- and below-market leases and origination costs associated with the in-place leases. We depreciate the amount allocated to building (inclusive of tenant improvements) over their estimated useful lives, which generally range from three to 40 years. We amortize the amount allocated to the above- and below-market leases over the remaining term of the associated lease, which generally range from one to 14 years, and record it as either an increase (in the case of below-market leases) or a decrease (in the case of above-market leases) to rental income. We amortize the amount allocated to the values associated with in-place leases over the expected term of the associated lease, which generally ranges from one to 14 years. If a tenant vacates its space prior to the contractual termination of the lease and no rental payments are being made on the lease, any unamortized balance of the related intangible will be written off. The tenant improvements and origination costs are amortized as an expense over the remaining life of the lease (or charged against earnings if the lease is terminated prior to its contractual expiration date). We assess fair value of the leases based on estimated cash flow projections that utilize appropriate discount and capitalization rates and available market information. Estimates of future cash flows are based on a number of factors including the historical operating results, known trends, and market/economic conditions that may affect the property. To the extent acquired leases contain fixed rate renewal options that are below-market and determined to be material, we amortize such below-market lease value into rental income over the renewal period.

We recognized $156.8 million, $191.6 million, $8.3 million, and $22.6 million of rental revenue for the three and six months ended June 30, 2016 and 2015, respectively, for the amortization of aggregate below-market leases in excess of above-market leases and a reduction in lease origination costs, resulting from the allocation of the purchase price of the applicable properties. Included in rental revenue is $149.9 million and $172.4 million for the three and six months ended June 30, 2016 for the amortization of the below-market lease at 388-390 Greenwich Street as a result of the tenant exercising their option to purchase the property and entering into an agreement to accelerate the sale. We recognized as a reduction to interest expense the amortization of the above-market rate mortgages assumed of $0.7 million, $1.3 million, $0.6 million, and $1.2 million for the three and six months ended June 30, 2016 and 2015, respectively.

The following summarizes our identified intangible assets (acquired above-market leases and in-place leases) and intangible liabilities (acquired below-market leases) as of June 30, 2016 and December 31, 2015 (in thousands):



	June 30, 2016			December 31, 2015
Identified intangible assets (included in other assets):
Gross amount	$	1,022,430		$	939,518
Accumulated amortization	(420,167		)	(403,747		)
Net⁽¹⁾	$	602,263		$	535,771
Identified intangible liabilities (included in deferred revenue):
Gross amount	$	861,539		$	866,561
Accumulated amortization	(498,992		)	(486,928		)
Net⁽¹⁾	$	362,547		$	379,633


(1)	As of June 30, 2016 and December 31, 2015, $0.1 million and $0.2 million, respectively and $0.1 million and $0.1 million, respectively, of net intangible assets and net intangible liabilities, were reclassified to assets held for sale and liabilities related to assets held for sale.

In February 2016, we closed on the sale of 885 Third Avenue but did not meet the criteria for sale accounting under the full accrual method in ASC 360-20, Property, Plant and Equipment - Real Estate Sales. As a result the property remains on our consolidated balance sheet until the criteria is met.

Fair Value Measurements

See Note 16, "Fair Value Measurements."

Investment in Marketable Securities

We designate a security as held-to-maturity, available-for-sale, or trading at acquisition. As of June 30, 2016, we did not have any securities designated as held-to-maturity or trading. We account for our available-for-sale securities at fair value pursuant to Accounting Standards Codification, or ASC, 820-10, with the net unrealized gains or losses reported as a component of accumulated other comprehensive income or loss. Any unrealized losses that are determined to be other-than-temporary are recognized in earnings up to their credit component.

The cost of bonds and marketable securities sold is determined using the specific identification method.

At June 30, 2016 and December 31, 2015, we held the following marketable securities (in thousands):



	June 30, 2016		December 31, 2015
Equity marketable securities	$	334	$	4,704
Commercial mortgage-backed securities	39,005		40,434
Total marketable securities available-for-sale	$	39,339	$	45,138

The cost basis of the commercial mortgage-backed securities was $37.8 million and $38.7 million at June 30, 2016 and December 31, 2015, respectively. These securities mature at various times through 2049.

During the three and six months ended June 30, 2016 and 2015, we disposed of marketable securities for aggregate net proceeds of $4.3 million, $4.3 million, $0.2 million, and $0.3 million, respectively.

Investments in Unconsolidated Joint Ventures

We assess our investments in unconsolidated joint ventures for recoverability, and if it is determined that a loss in value of the investment is other than temporary, we write down the investment to its fair value. We evaluate our equity investments for impairment based on the joint ventures' projected discounted cash flows. We do not believe that the values of any of our equity investments were impaired at June 30, 2016.

We may originate loans for real estate acquisition, development and construction, where we expect to receive some of the residual profit from such projects. When the risk and rewards of these arrangements are essentially the same as an investor or joint venture partner, we account for these arrangements as real estate investments under the equity method of accounting for investments. Otherwise, we account for these arrangements consistent with our loan accounting for our debt and preferred equity investments.

Revenue Recognition

Rental revenue is recognized on a straight-line basis over the term of the lease. Rental revenue recognition commences when the tenant takes possession or controls the physical use of the leased space. In order for the tenant to take possession, the leased space must be substantially ready for its intended use. To determine whether the leased space is substantially ready for its intended use, management evaluates whether we are or the tenant is the owner of tenant improvements for accounting purposes. When management concludes that we are the owner of tenant improvements, rental revenue recognition begins when the tenant takes possession of the finished space, which is when such tenant improvements are substantially complete. In certain instances, when management concludes that we are not the owner (the tenant is the owner) of tenant improvements, rental revenue recognition begins when the tenant takes possession of or controls the space. When management concludes that we are the owner of tenant improvements for accounting purposes, we record amounts funded to construct the tenant improvements as a capital asset. For these tenant improvements, we record amounts reimbursed by tenants as a reduction of the capital asset. When management concludes that the tenant is the owner of tenant improvements for accounting purposes, we record our contribution towards those improvements as a lease incentive, which is included in deferred costs, net on our consolidated balance sheets and amortized as a reduction to rental revenue on a straight-line basis over the term of the lease. The excess of rents recognized over amounts contractually due pursuant to the underlying leases are included in deferred rents receivable on the consolidated balance sheets. We establish, on a current basis, an allowance for future potential tenant credit losses, which may occur against this account. The balance reflected on the consolidated balance sheets is net of such allowance.

In addition to base rent, our tenants also generally will pay their pro rata share of increases in real estate taxes and operating expenses for the building over a base year. In some leases, in lieu of paying additional rent based upon increases in building operating expenses, the tenant will pay additional rent based upon increases in the wage rate paid to porters over the porters' wage rate in effect during a base year or increases in the consumer price index over the index value in effect during a base year. In addition, many of our leases contain fixed percentage increases over the base rent to cover escalations. Electricity is most often supplied by the landlord either on a sub-metered basis, or rent inclusion basis (i.e., a fixed fee is included in the rent for electricity, which amount may increase based upon increases in electricity rates or increases in electrical usage by the tenant). Base building services other than electricity (such as heat, air conditioning and freight elevator service during business hours, and base building cleaning) are typically provided at no additional cost, with the tenant paying additional rent only for services which exceed base building services or for services which are provided outside normal business hours. These escalations are based on actual expenses incurred in the prior calendar year. If the expenses in the current year are different from those in the prior year, then during the current year, the escalations will be adjusted to reflect the actual expenses for the current year.

We record a gain on sale of real estate when title is conveyed to the buyer, subject to the buyer's financial commitment being sufficient to provide economic substance to the sale and provided that we have no substantial economic involvement with the buyer.

Interest income on debt and preferred equity investments is accrued based on the contractual terms of the instruments and when, in the opinion of management, it is deemed collectible. Some debt and preferred equity investments provide for accrual of interest at specified rates, which differ from current payment terms. Interest is recognized on such loans at the accrual rate subject to management's determination that accrued interest is ultimately collectible, based on the underlying collateral and operations of the borrower. If management cannot make this determination, interest income above the current pay rate is recognized only upon actual receipt.

Deferred origination fees, original issue discounts and loan origination costs, if any, are recognized as an adjustment to the interest income over the terms of the related investments using the effective interest method. Fees received in connection with loan commitments are also deferred until the loan is funded and are then recognized over the term of the loan as an adjustment to yield. Discounts or premiums associated with the purchase of loans are amortized or accreted into interest income as a yield adjustment on the effective interest method based on expected cashflows through the expected maturity date of the related investment. If we purchase a debt or preferred equity investment at a discount, intend to hold it until maturity and expect to recover the full value of the investment, we accrete the discount into income as an adjustment to yield over the term of the investment. If we purchase a debt or preferred equity investment at a discount with the intention of foreclosing on the collateral, we do not accrete the discount. For debt investments acquired at a discount for credit quality, the difference between contractual cash flows and expected cash flows at acquisition is not accreted. Anticipated exit fees, the collection of which is expected, are also recognized over the term of the loan as an adjustment to yield.

Debt and preferred equity investments are placed on a non-accrual status at the earlier of the date at which payments become 90 days past due or when, in the opinion of management, a full recovery of interest income becomes doubtful. Interest income recognition on any non-accrual debt or preferred equity investment is resumed when such non-accrual debt or preferred equity investment becomes contractually current and performance is demonstrated to be resumed. Interest is recorded as income on impaired loans only to the extent cash is received.

We may syndicate a portion of the loans that we originate or sell the loans individually. When a transaction meets the criteria for sale accounting, we derecognize the loan sold and recognize gain or loss based on the difference between the sales price and the carrying value of the loan sold. Any related unamortized deferred origination fees, original issue discounts, loan origination costs, discounts or premiums at the time of sale are recognized as an adjustment to the gain or loss on sale, which is included in investment income on the consolidated statement of operations. Any fees received at the time of sale or syndication are recognized as part of investment income.

Asset management fees are recognized on a straight-line basis over the term of the asset management agreement.

Reserve for Possible Credit Losses

The expense for possible credit losses in connection with debt and preferred equity investments is the charge to earnings to increase the allowance for possible credit losses to the level that we estimate to be adequate, based on Level 3 data, considering delinquencies, loss experience and collateral quality. Other factors considered include geographic trends, product diversification, the size of the portfolio and current economic conditions. Based upon these factors, we establish a provision for possible credit loss on each individual investment. When it is probable that we will be unable to collect all amounts contractually due, the investment is considered impaired.

Where impairment is indicated on an investment that is held to maturity, a valuation allowance is measured based upon the excess of the recorded investment amount over the net fair value of the collateral. Any deficiency between the carrying amount of an asset and the calculated value of the collateral is charged to expense. We continue to assess or adjust our estimates based on circumstances of a loan and the underlying collateral. If additional information reflects increased recovery of our investment, we will adjust our reserves accordingly. There were no loan reserves recorded during the three and six months ended June 30, 2016 and 2015.

Debt and preferred equity investments held for sale are carried at the lower of cost or fair market value using available market information obtained through consultation with dealers or other originators of such investments as well as discounted cash flow models based on Level 3 data pursuant to ASC 820-10. As circumstances change, management may conclude not to sell an investment designated as held for sale. In such situations, the investment will be reclassified at its net carrying value to debt and preferred equity investments held to maturity. For these reclassified investments, the difference between the current carrying value and the expected cash to be collected at maturity will be accreted into income over the remaining term of the investment.

Income Taxes

SL Green is taxed as a REIT under Section 856(c) of the Code. As a REIT, SL Green generally is not subject to Federal income tax. To maintain its qualification as a REIT, SL Green must distribute at least 90% of its REIT taxable income to its stockholders and meet certain other requirements. If SL Green fails to qualify as a REIT in any taxable year, SL Green will be subject to Federal income tax on SL Green's taxable income at regular corporate rates. SL Green may also be subject to certain state, local and franchise taxes. Under certain circumstances, Federal income and excise taxes may be due on SL Green's undistributed taxable income.

The Operating Partnership is a partnership and, as a result, all income and losses of the partnership are allocated to the partners for inclusion in their respective income tax returns. The only provision for income taxes included in the consolidated statements of operations relates to the Operating Partnership’s consolidated taxable REIT subsidiaries. The Operating Partnership may also be subject to certain state, local and franchise taxes.

Pursuant to amendments to the Code that became effective January 1, 2001, we have elected, and may elect in the future, to treat certain of our existing or newly created corporate subsidiaries as taxable REIT subsidiaries, or TRSs. In general, TRSs may perform non-customary services for the tenants of the Company, hold assets that we cannot hold directly and generally may engage in any real estate or non-real estate related business. The TRSs generate income, resulting in Federal and state income tax liability for these entities.

During the three and six months ended June 30, 2016 and 2015, we recorded Federal, state and local tax provisions of $0.3 million, $1.5 million, $1.1 million, and $1.4 million, respectively.

We follow a two-step approach for evaluating uncertain tax positions. Recognition (step one) occurs when an enterprise concludes that a tax position, based solely on its technical merits, is more-likely-than-not to be sustained upon examination. Measurement (step two) determines the amount of benefit that is more-likely-than-not to be realized upon settlement. Derecognition of a tax position that was previously recognized would occur when a company subsequently determines that a tax position no longer meets the more-likely-than-not threshold of being sustained. The use of a valuation allowance as a substitute for derecognition of tax positions is prohibited.

Stock-Based Employee Compensation Plans

We have a stock-based employee compensation plan, described more fully in Note 14, "Share-based Compensation."

The Company's stock options are recorded at fair value at the time of issuance. Fair value of the stock options is determined using the Black-Scholes option pricing model. The Black-Scholes model was developed for use in estimating the fair value of traded options, which have no vesting restrictions and are fully transferable. In addition, option valuation models require the input of highly subjective assumptions including the expected stock price volatility. Because our plan has characteristics significantly different from those of traded options and because changes in the subjective input assumptions can materially affect the fair value estimate, in our opinion, the existing models do not necessarily provide a reliable single measure of the fair value of the employee stock options.

Compensation cost for stock options, if any, is recognized over the vesting period of the award. Our policy is to grant options with an exercise price equal to the quoted closing market price of the Company's common stock on the grant date. Awards of stock or restricted stock are expensed as compensation over the benefit period based on the fair value of the stock on the grant date.

For share-based awards with a performance or market measure, we recognize compensation cost over the requisite service period, using the accelerated attribution expense method. The requisite service period begins on the date the compensation committee of SL Green's board of directors authorizes the award, adopts any relevant performance measures and communicates the award to the employees. For programs with awards that vest based on the achievement of a performance condition or market condition, we determine whether it is probable that the performance condition will be met, and estimate compensation cost based on the fair value of the award at the applicable reporting date estimated using a binomial model or market quotes. For share-based awards for which there is no pre-established performance measure, we recognize compensation cost over the service vesting period, which represents the requisite service period, on a straight-line basis. In accordance with the provisions of our share-based incentive compensation plans, we accept the return of shares of the Company's common stock, at the current quoted market price, from certain key employees to satisfy minimum statutory tax-withholding requirements related to shares that vested during the period.

Awards can also be made in the form of a separate series of units of limited partnership interest in the Operating Partnership called long-term incentive plan units, or LTIP units. LTIP units, which can be granted either as free-standing awards or in tandem with other awards under our stock incentive plan, are valued by reference to the value of the Company's common stock at the time of grant, and are subject to such conditions and restrictions as the compensation committee of the Company's board of directors may determine, including continued employment or service, computation of financial metrics and/or achievement of pre-established performance goals and objectives.

Earnings per Share of the Company

The Company presents both basic and diluted earnings per share, or EPS. Basic EPS excludes dilution and is computed by dividing net income or loss attributable to common stockholders by the weighted average number of common shares outstanding during the period. Basic EPS includes participating securities, consisting of unvested restricted stock that receive nonforfeitable dividends similar to shares of common stock. Diluted EPS reflects the potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted into common stock, where such exercise or conversion would result in a lower EPS amount. Diluted EPS also includes units of limited partnership interest. The dilutive effect of stock options is reflected in the weighted average diluted outstanding shares calculation by application of the treasury stock method. There is no dilutive effect for the exchangeable senior notes as the conversion premium will be paid in cash.

Earnings per Unit of the Operating Partnership

The Operating Partnership presents both basic and diluted earnings per unit, or EPU. Basic EPU excludes dilution and is computed by dividing net income or loss attributable to common unitholders by the weighted average number of common units outstanding during the period. Basic EPU includes participating securities, consisting of unvested restricted units that receive nonforfeitable dividends similar to shares of common units. Diluted EPU reflects the potential dilution that could occur if securities or other contracts to issue common units were exercised or converted into common units, where such exercise or conversion would result in a lower EPU amount. The dilutive effect of unit options is reflected in the weighted average diluted outstanding units calculation by application of the treasury stock method. There is no dilutive effect for the exchangeable senior notes as the conversion premium will be paid in cash.

Use of Estimates

The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from those estimates.

Concentrations of Credit Risk

Financial instruments that potentially subject us to concentrations of credit risk consist primarily of cash investments, debt and preferred equity investments and accounts receivable. We place our cash investments in excess of insured amounts with high quality financial institutions. The collateral securing our debt and preferred equity investments is located in New York City. See Note 5, "Debt and Preferred Equity Investments." We perform ongoing credit evaluations of our tenants and require most tenants to provide security deposits or letters of credit. Though these security deposits and letters of credit are insufficient to meet the total value of a tenant's lease obligation, they are a measure of good faith and a source of funds to offset the economic costs associated with lost rent and the costs associated with re-tenanting a space. Although the properties in our real estate portfolio are primarily located in Manhattan, we also have properties located in Brooklyn, Long Island, Westchester County, Connecticut and New Jersey. The tenants located in our buildings operate in various industries. Other than two tenants, who account for 9.1% and 6.4% of our share of annualized cash rent, no other tenant in our portfolio accounted for more than 5.0% of our share of annualized cash rent, including our share of joint venture annualized rent, at June 30, 2016. For the three months ended June 30, 2016, 10.0%, 9.3%, 7.2%, 6.7%, 5.9%, and 5.1% of our share of annualized cash rent for consolidated properties was attributable to 11 Madison Avenue, 1515 Broadway, 919 Third Avenue, 1185 Avenue of the Americas, 420 Lexington Avenue and One Madison Avenue, respectively. Annualized cash rent for all other consolidated properties was below 5.0%.

Reclassification

Certain prior year balances have been reclassified to conform to our current year presentation.

Accounting Standards Updates

In June 2016, the FASB issued Accounting Standards Update (ASU) No. 2016-13, Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. The guidance changes how entities will measure credit losses for most financial assets and certain other instruments that aren’t measured at fair value through net income. The guidance replaces the current ‘incurred loss’ model with an ‘expected loss’ approach. The guidance is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Early adoption is permitted after December 2018. The Company has not yet adopted this new guidance and is currently evaluating the impact of adopting this new accounting standard on the Company’s consolidated financial statements.

In March 2016, the FASB issued Accounting Standards Update (ASU) No. 2016-09, Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting. The guidance simplifies the accounting for share-based payment award transactions including: income tax consequences, classification of awards as either equity or liabilities and classification on the statement of cash flows. The guidance is effective for fiscal years beginning after December 15, 2016, including interim periods within those fiscal years. Early adoption is permitted. The Company has not yet adopted this new guidance and is currently evaluating the impact of adopting this new accounting standard on the Company’s consolidated financial statements.

In March 2016, the FASB issued ASU 2016-07, Investments Equity Method and Joint Ventures (Topic 323). The guidance eliminates the requirement that an entity retroactively adopt the equity method of accounting if an investment qualifies for use of the equity method as a result of an increase in the level of ownership or degree of influence. The amendments require that the equity method investor add the cost of acquiring the additional interest in the investee to the current basis of the investor’s previously held interest and adopt the equity method of accounting as of the date the investment becomes qualified for equity method accounting. The guidance is effective for all entities for fiscal years beginning after 15 December 2016 and interim periods within those years. Early adoption is permitted in any interim or annual period. The Company has not yet adopted this new guidance and is currently evaluating the impact of adopting this new accounting standard on the Company’s consolidated financial statements.

In February 2016, the FASB issued ASU 2016-02, Leases. The guidance requires lessees to recognize lease assets and lease liabilities for those leases classified as operating leases under the previous standard. The accounting applied by a lessor is largely unchanged from that applied under the previous standard. The Guidance is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. Early adoption is permitted. The Company has not yet adopted this new guidance and is currently evaluating the impact of adopting this new accounting standard on the Company’s consolidated financial statements.

In January 2016, the FASB issued ASU 2016-01 (ASU825-10), Recognition and Measurement of Financial Assets and Financial Liabilities. The guidance requires entities to measure equity investments that do not result in consolidation and are not accounted for under the equity method at fair value and to record changes in instruments-specific credit risk for financial liabilities measured under the fair value option in other comprehensive income. The guidance is effective for fiscal years beginning after December 15, 2017, and for interim periods therein. The Company has not yet adopted this new guidance and is currently evaluating the impact of adopting this new accounting standard on the Company’s consolidated financial statements.

In April 2015, the FASB issued final guidance to simplify the presentation of debt issuance costs by requiring debt issuance costs to be presented as a deduction from the corresponding debt liability (ASU 2015-03). The guidance requires that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability. The Company adopted the guidance effective January 1, 2016. Accordingly, as of June 30, 2016 and December 31, 2015, $101.5 million and $130.3 million, respectively, of deferred debt issuance cost, net of amortization are presented as a direct reduction within Mortgages and other loans payable, Revolving credit facility, Term loan and senior unsecured notes on the Company's consolidated balance sheets.

In February 2015, the FASB issued guidance that amends the current consolidation guidance, including introducing a separate consolidation analysis specific to limited partnerships and other similar entities (ASU 2015-02). Under this analysis, limited partnerships and other similar entities will be considered a VIE unless the limited partners hold substantive kick-out rights or participating rights. The Company adopted the guidance effective January 1, 2016. Under the revised guidance, certain entities, including the Operating Partnership, now qualify as variable interest entities while some of our entities originally classified as variable interest entities no longer meet the criteria. The change in designation did not have a material impact on our consolidated financial statements and did not change the consolidation conclusion on these entities.

In May 2014, the FASB issued a new comprehensive revenue recognition guidance which requires us to recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which we expect to be entitled in exchange for those goods and services (ASU 2014-09). The guidance also requires enhanced disclosures to help users of financial statements better understand the nature, amount, timing, and uncertainty of revenue that is recognized.

In March 2016, the FASB issued implementation guidance which clarifies principal versus agent considerations in reporting revenue gross versus net (ASU 2016-08).

In April 2016, the FASB issued implementation guidance which clarifies the identification of performance obligations (ASU 2016-10).

In April 2016, the FASB amended its new revenue recognition guidance on identifying performance obligations to allow entities to disregard items that are immaterial and clarify when a good or service is separately identifiable (ASU 2016-10).

In May 2016, the FASB issued implementation guidance relating to transition, collectability, noncash consideration and presentation matters (ASU 2016-12).

These ASUs are effective for annual and interim periods beginning after December 15, 2017. Early adoption is permitted, but not before interim and annual reporting periods beginning after December 15, 2016. The new guidance can be applied either retrospectively to each prior reporting period presented, or as a cumulative-effect adjustment as of the date of adoption. The Company has not yet adopted this guidance and is currently evaluating the new guidance to determine the impact it may have on our consolidated financial statements.

Property Acquisitions

6 Months Ended

Jun. 30, 2016

Business Combinations [Abstract]

Property Acquisitions

2016 Acquisitions

During the six months ended June 30, 2016, the property listed below was acquired from a third party. The following summarizes our preliminary allocation of the purchase price of the assets acquired and liabilities assumed upon the closing of this acquisition (in thousands):



	183 Broadway⁽¹⁾
Acquisition Date	March 2016
Ownership Type	Fee Interest
Property Type	Retail/Residential

Purchase Price Allocation:
Land	$	26,640
Building and building leasehold	2,960
Above-market lease value	—
Acquired in-place leases	—
Other assets, net of other liabilities	—
Assets acquired	29,600
Mark-to-market assumed debt	—
Below-market lease value	—
Derivatives	—
Liabilities assumed	—
Purchase price	$	29,600
Net consideration funded by us at closing, excluding consideration financed by debt	$	29,600
Equity and/or debt investment held	$	—
Debt assumed	$	—


(1)	We are currently in the process of analyzing the purchase price allocation and, as such, we have not allocated any value to intangible assets such as above- and below-market lease or in-place leases.

2015 Acquisitions

During the six months ended June 30, 2016, we finalized the purchase price allocations based on facts and circumstances that existed at the acquisition dates for the following 2015 acquisitions (in thousands):



	Upper Eastside Residential ⁽¹⁾		11 Madison Avenue ⁽¹⁾			1640 Flatbush Avenue⁽¹⁾
Acquisition Date	June 2015		August 2015			March 2015
Ownership Type	Fee Interest		Fee Interest			Fee Interest
Property Type	Residential/Retail		Office			Retail

Purchase Price Allocation:
Land	$	48,152	$	675,776		$	6,226
Building and building leasehold	—		1,553,602			501
Above-market lease value	—		19,764			—
Acquired in-place leases	1,922		366,949			146
Other assets, net of other liabilities	—		—			—
Assets acquired	50,074		2,616,091			6,873
Mark-to-market assumed debt	—		—			—
Below-market lease value	—		(187,732		)	(73		)
Derivatives	—		—			—
Liabilities assumed	—		(187,732		)	(73		)
Purchase price	$	50,074	$	2,428,359		$	6,800
Net consideration funded by us at closing, excluding consideration financed by debt	$	—	$	—		$	—
Equity and/or debt investment held	$	—	$	—		$	—
Debt assumed	$	—	$	—		$	—

(1)

Based on our preliminary analysis of the purchase price, we had allocated $17.5 million and $32.5 million to land and building, respectively, at the Upper Eastside Residential Property, $849.9 million and $1.6 billion to land and building, respectively, at 11 Madison Avenue, and $6.1 million and $0.7 million to land and building, respectively, at 1640 Flatbush Avenue. The impact to our consolidated statement of operations for the six months ended June 30, 2016 to adjust for the finalized purchase price allocations was $6.0 million in rental revenue for the amortization of aggregate below-market leases and $14.5 million of depreciation expense.

- Definition

The entire disclosure for a business combination (or series of individually immaterial business combinations) completed during the period, including background, timing, and recognized assets and liabilities. The disclosure may include leverage buyout transactions (as applicable).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1497-128463

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1490-128463

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1392-128463

Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e7008-128479

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1486-128463

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
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-Name Accounting Standards Codification
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-Name Accounting Standards Codification
-Topic 805
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-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6996-128479

+ Details

Properties Held for Sale and Property Dispositions

6 Months Ended

Jun. 30, 2016

Discontinued Operations and Disposal Groups [Abstract]

Properties Held for Sale and Property Dispositions

Properties Held for Sale

During the three months ended June 30, 2016, we entered into an agreement to sell the property at 500 West Putnam Avenue in Greenwich, Connecticut for $41.0 million and recorded a $10.4 million depreciable real estate reserve on the property. We closed on the sale in July.

Property Dispositions

The following table summarizes the properties sold during the six months ended June 30, 2016:



Property	Disposition Date	Property Type	Approximate Square Feet	Sales Price⁽¹⁾ (in millions)		Gain on Sale⁽²⁾ (in millions)
248-252 Bedford Avenue	February 2016	Residential	66,611	$	55.0	$	15.3
885 Third Avenue ⁽³⁾	February 2016	Land	607,000	453.0		—
7 International Drive	May 2016	Land	31 Acres	20.0		(6.9		)
388 Greenwich	June 2016	Office	2,635,000	2,002.3		206.5


(1)	Sales price represents the gross sales price for a property or the gross asset valuation for interests in a property.


(2)	The gain on sale for 248-252 Bedford Avenue and 388 Greenwich are net of $1.3 million and $1.6 million, respectively in employee compensation awards accrued in connection with the realization of the investment gain as a bonus to certain employees that were instrumental in realizing the gain on sale. Additionally, amounts do not include adjustments for expenses recorded in subsequent periods.


(3)	In February 2016, we closed on the sale of 885 Third Avenue. The sale did not meet the criteria for sale accounting and as a result the property remains on our consolidated balance sheet until the criteria is met. An estimated loss relating to the sale of $6.6 million was recorded in December 2015.

Discontinued Operations

The Company adopted ASU 2014-08 effective January 1, 2015 which raised the threshold for disposals to qualify as discontinued operations to dispositions which represent a strategic shift in an entity’s operations. The guidance was applied prospectively for new disposals. As a result, the results of operations for 500 West Putnam Avenue in Greenwich, Connecticut, which was classified as held for sale at June 30, 2016 along with 120 West 45th Street and 131-137 Spring Street, which were classified as held for sale at June 30, 2015, are included in continuing operations for all periods presented.

Discontinued operations for the six months ended June 30, 2015 included the results of operations of 180 Maiden Lane, which was held for sale at December 31, 2014 and sold in January 2015, as follows (in thousands):



	Three and six months ended June 30, 2015
Revenues
Rental revenue	$	236
Escalation and reimbursement revenues	(127		)
Other income	—
Total revenues	109
Operating expenses	(631		)
Real estate taxes	250
Ground rent	—
Transaction related costs	(49		)
Depreciable real estate reserves	109
Interest expense, net of interest income	3
Amortization of deferred financing costs	—
Depreciation and amortization
Total expenses	(318		)
Net income from discontinued operations	$	427

- Definition

The entire disclosure related to a disposal group. Includes, but is not limited to, a discontinued operation, disposal classified as held-for-sale or disposed of by means other than sale or disposal of an individually significant component.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=65878427&loc=SL51721533-107759

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 4B
-URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721665-107760

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
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-URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721675-107760

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 3A
-URI http://asc.fasb.org/extlink&oid=64862545&loc=SL51724579-110230

Reference 5: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 205
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-URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721663-107760

Reference 6: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 360
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-Paragraph 3
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 205
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-Section 50
-Paragraph 1
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Reference 8: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 205
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-Paragraph 5B
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Reference 9: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 205
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-Paragraph 3A
-URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721659-107760

Reference 10: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 5A
-URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721671-107760

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-Name Accounting Standards Codification
-Topic 205
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-Section 50
-Paragraph 5D
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
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Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721683-107760

+ Details

Debt and Preferred Equity Investments

6 Months Ended

Jun. 30, 2016

Investments, Debt and Equity Securities [Abstract]

Debt and Preferred Equity Investments

During the six months ended June 30, 2016 and 2015, our debt and preferred equity investments, net of discounts and deferred origination fees, increased $255.0 million and $386.2 million, respectively, due to originations, purchases, advances under future funding obligations, discount and fee amortization, and paid-in-kind interest, net of premium amortization. We recorded repayments, participations and sales of $567.9 million and $109.8 million during the six months ended June 30, 2016 and 2015, respectively, which offset the increases in debt and preferred equity investments.

Certain debt investments that were participated out but did not meet the conditions for sale accounting are included in other assets and other liabilities on the consolidated balance sheets.

Debt Investments

As of June 30, 2016 and December 31, 2015 we held the following debt investments with an aggregate weighted average current yield of 9.55% at June 30, 2016 (in thousands):



Loan Type	June 30, 2016 Future Funding Obligations		June 30, 2016 Senior Financing		June 30, 2016 Carrying Value ⁽¹⁾		December 31, 2015 Carrying Value ⁽¹⁾		Maturity Date ⁽²⁾
Fixed Rate Investments:
Mezzanine Loan	$	—	$	165,000	$	72,271	$	72,102	October 2016
Jr. Mortgage Participation/Mezzanine Loan	—		1,109,000		189,380		104,661		March 2017
Mezzanine Loan^(3a)	10,000		502,100		55,988		41,115		June 2017
Mortgage Loan⁽⁴⁾	—		—		26,284		26,262		February 2019
Mortgage Loan	—		—		447		513		August 2019
Mezzanine Loan	—		15,000		3,500		3,500		September 2021
Mezzanine Loan^(3b)	—		89,527		19,939		19,936		November 2023
Mezzanine Loan^(3c)	—		115,000		12,921		24,916		June 2024
Mezzanine Loan	—		95,000		30,000		30,000		January 2025
Mezzanine Loan⁽⁵⁾	—		—		—		49,691
Jr. Mortgage Participation⁽⁶⁾	—		—		—		49,000
Other⁽⁶⁾⁽⁷⁾	—		—		—		23,510
Other⁽⁶⁾⁽⁷⁾	—		—		—		66,183
Total fixed rate	$	10,000	$	2,090,627	$	410,730	$	511,389
Floating Rate Investments:
Mortgage/Mezzanine Loan⁽⁸⁾	—		—		105,278		94,901		October 2016
Mezzanine Loan	—		360,000		99,811		99,530		November 2016
Mezzanine Loan	8,459		136,384		52,827		49,751		December 2016
Mezzanine Loan	281		39,201		13,761		13,731		December 2016
Mortgage/Mezzanine Loan^(3d)	43,572		—		137,150		134,264		January 2017
Mezzanine Loan	1,127		118,949		28,796		28,551		January 2017
Mezzanine Loan^(3e)(9)	—		40,000		15,212		68,977		June 2017
Mortgage/ Mezzanine Loan	—		—		32,679		—		June 2017
Mortgage/Mezzanine Loan	—		—		22,919		22,877		July 2017
Mortgage/Mezzanine Loan	—		—		16,931		16,901		September 2017
Mortgage/Mezzanine Loan	4,234		—		19,607		19,282		October 2017
Mezzanine Loan	—		60,000		14,931		14,904		November 2017
Mezzanine Loan^(3f)	—		85,000		15,011		29,505		December 2017
Mezzanine Loan^(3g)	—		65,000		14,542		28,563		December 2017
Mortgage/Mezzanine Loan^(3h)	795		—		14,998		14,942		December 2017
Jr. Mortgage Participation	—		40,000		19,880		19,846		April 2018
Mezzanine Loan	—		175,000		34,785		34,725		April 2018
Jr. Mortgage Participation/Mezzanine Loan⁽³ⁱ⁾	—		55,000		10,512		20,510		July 2018
Mortgage/Mezzanine Loan⁽¹⁰⁾	523		20,523		10,829		31,210		August 2018
Mezzanine Loan	2,325		45,025		34,318		—		October 2018
Mezzanine Loan	—		33,000		26,812		26,777		December 2018
Mezzanine Loan	4,560		156,383		54,731		52,774		December 2018
Mezzanine Loan	23,456		217,202		55,217		49,625		December 2018



Loan Type	June 30, 2016 Future Funding Obligations		June 30, 2016 Senior Financing		June 30, 2016 Carrying Value ⁽¹⁾		December 31, 2015 Carrying Value ⁽¹⁾		Maturity Date ⁽²⁾
Mezzanine Loan	6,383		16,383		5,363		—		January 2019
Mezzanine Loan	—		38,000		21,869		21,845		March 2019
Mezzanine Loan	—		265,000		24,646		—		April 2019
Mezzanine Loan⁽¹¹⁾	—		—		—		22,625
Mezzanine Loan⁽¹²⁾	—		—		—		74,700
Mezzanine Loan⁽¹³⁾	—		—		—		66,398
Jr. Mortgage Participation/Mezzanine Loan⁽⁶⁾	—		—		—		18,395
Mezzanine Loan⁽¹⁴⁾	—		—		—		40,346
Total floating rate	$	95,715	$	1,966,050	$	903,415	$	1,116,455
Total	$	105,715	$	4,056,677	$	1,314,145	$	1,627,844


(1)	Carrying value is net of discounts, premiums, original issue discounts and deferred origination fees.


(2)	Represents contractual maturity, excluding any unexercised extension options.

(3)

Carrying value is net of the following amount that was participated out, which is included in other assets and other liabilities on the consolidated balance sheets as a result of the transfer not meeting the conditions for sale accounting: (a) $41.3 million, (b) $5.0 million, (c) $12.0 million, (d) $36.3 million, (e) $14.5 million, (f) $14.6 million, (g) $14.1 million, (h) $5.1 million and (i) $10.0 million.


(4)	In September 2014, we acquired a $26.4 million mortgage loan at a $0.2 million discount and a $5.7 million junior mortgage participation at a $5.7 million discount. The junior mortgage participation was a nonperforming loan at acquisition and is currently on non-accrual status.


(5)	In April 2016, we closed on an option to acquire a 20% interest in the underlying asset at a previously agreed upon purchase option valuation, and our mezzanine loan was simultaneously repaid.


(6)	These loans were repaid in March 2016.


(7)	These loans were collateralized by defeasance securities.


(8)	In April 2016, the maturity date was extended to October 2016.


(9)	In March 2016, the mortgage was sold.


(10)	In January 2016, the loans were modified. In March 2016, the mortgage was sold.


(11)	This loan was repaid in June 2016.


(12)	This loan was repaid in May 2016.


(13)	In March 2016, we contributed our interest in the loan in exchange for a joint venture interest which is now accounted for under the equity method of accounting. It is included in unconsolidated joint ventures on the consolidated balance sheets.


(14)	These loans were repaid in February 2016.

Preferred Equity Investments

As of June 30, 2016 and December 31, 2015, we held the following preferred equity investments with an aggregate weighted average current yield of 7.97% at June 30, 2016 (in thousands):



Type	June 30, 2016 Future Funding Obligations		June 30, 2016 Senior Financing		June 30, 2016 Carrying Value ⁽¹⁾		December 31, 2015 Carrying Value ⁽¹⁾		Initial Mandatory Redemption
Preferred equity	$	—	$	71,486	$	9,974	$	9,967	March 2018
Preferred equity	4,779		59,966		33,062		32,209		November 2018
Total	$	4,779	$	131,452	$	43,036	$	42,176


(1)	Carrying value is net of deferred origination fees.

At June 30, 2016 and December 31, 2015, all debt and preferred equity investments were performing in accordance with the terms of the relevant investments, with the exception of a junior mortgage participation acquired in September 2014, which has a carrying value of zero.

We have determined that we have one portfolio segment of financing receivables at June 30, 2016 and 2015 comprising commercial real estate which is primarily recorded in debt and preferred equity investments. Included in other assets is an additional amount of financing receivables totaling $119.3 million and $121.5 million at June 30, 2016 and December 31, 2015, respectively. No financing receivables were 90 days past due at June 30, 2016.

- Definition

The entire disclosure for investments in certain debt and equity securities.

+ References + Details

Investments in Unconsolidated Joint Ventures

6 Months Ended

Jun. 30, 2016

Equity Method Investments and Joint Ventures [Abstract]

Investments in Unconsolidated Joint Ventures

We have investments in several real estate joint ventures with various partners. As of June 30, 2016, 650 Fifth Avenue, 800 Third Avenue, 21 East 66th Street, 605 West 42^nd Street and certain properties within the Stonehenge Portfolio are VIEs in which we are not the primary beneficiary. Our net equity investment in these VIEs was $216.9 million as of June 30, 2016. As of December 31, 2015, 650 Fifth Avenue and 33 Beekman were VIEs in which we were not the primary beneficiary. Our net equity investment in these VIEs was $39.7 million as of December 31, 2015. Our maximum loss is limited to the amount of our equity investment in these VIEs. All other investments below are voting interest entities. As we do not control the joint ventures listed below, we account for them under the equity method of accounting.

The table below provides general information on each of our joint ventures as of June 30, 2016:



Property	Partner	Ownership Interest	Economic Interest	Approximate Square Feet	Acquisition Date	Acquisition Price⁽¹⁾ (in thousands)
100 Park Avenue	Prudential Real Estate Investors	49.90%	49.90%	834,000	January 2000	$	95,800
717 Fifth Avenue	Jeff Sutton/Private Investor	10.92%	10.92%	119,500	September 2006	251,900
800 Third Avenue	Private Investors	60.52%	60.52%	526,000	December 2006	285,000
1745 Broadway	Ivanhoe Cambridge, Inc.	56.88%	56.88%	674,000	April 2007	520,000
Jericho Plaza ⁽²⁾	Onyx Equities/Private Investor	11.67%	11.67%	640,000	April 2007	210,000
11 West 34th Street	Private Investor/ Jeff Sutton	30.00%	30.00%	17,150	December 2010	10,800
3 Columbus Circle⁽³⁾	The Moinian Group	48.90%	48.90%	741,500	January 2011	500,000
280 Park Avenue	Vornado Realty Trust	50.00%	50.00%	1,219,158	March 2011	400,000
1552-1560 Broadway⁽⁴⁾	Jeff Sutton	50.00%	50.00%	35,897	August 2011	136,550
724 Fifth Avenue	Jeff Sutton	50.00%	50.00%	65,040	January 2012	223,000
10 East 53rd Street	Canadian Pension Plan Investment Board	55.00%	55.00%	354,300	February 2012	252,500
521 Fifth Avenue	Plaza Global Real Estate Partners LP	50.50%	50.50%	460,000	November 2012	315,000
21 East 66th Street⁽⁵⁾	Private Investors	32.28%	32.28%	16,736	December 2012	75,000
650 Fifth Avenue⁽⁶⁾	Jeff Sutton	50.00%	50.00%	32,324	November 2013
121 Greene Street	Jeff Sutton	50.00%	50.00%	7,131	September 2014	27,400
175-225 Third Street Brooklyn, New York	KCLW 3rd Street LLC/LIVWRK LLC	95.00%	95.00%	—	October 2014	74,600
55 West 46th Street	Prudential Real Estate Investors	25.00%	25.00%	347,000	November 2014	295,000
Stonehenge Portfolio	Various	Various	Various	2,046,733	Various	36,668
131-137 Spring Street	Invesco Real Estate	20.00%	20.00%	68,342	August 2015	277,750
76 11th Avenue⁽⁷⁾	Oxford/Vornado	33.33%	36.58%	764,000	March 2016	138,240
605 West 42nd Street⁽⁸⁾	The Moinian Group	20.00%	20.00%	927,358	April 2016	759,000


(1)	Acquisition price represents the actual or implied gross purchase price for the joint venture, which is not adjusted for subsequent acquisitions of additional interests.


(2)	Our ownership percentage was reduced in the first quarter of 2016, from 77.78% to 11.67%, upon completion of the restructuring of the joint venture.


(3)	As a result of the sale of a condominium interest in September 2012, Young & Rubicam, Inc., or Y&R, owns floors three through eight at the property. Because the joint venture has an option to repurchase these floors, the gain associated with this sale was deferred.


(4)	The purchase price represents only the purchase of the 1552 Broadway interest which comprised approximately 13,045 square feet. The joint venture also owns a long-term leasehold interest in the retail space and certain other spaces at 1560 Broadway, which is adjacent to 1552 Broadway.


(5)	We hold a 32.28% interest in three retail and two residential units at the property and a 16.14% interest in three residential units at the property.

(6)

The joint venture owns a long-term leasehold interest in the retail space at 650 Fifth Avenue. In connection with the ground lease obligation, SLG provided a performance guaranty and our joint venture partner executed a contribution agreement to reflect its pro rata obligation. In the event the property is converted into a condominium unit and the landlord elects the purchase option, the joint venture shall be obligated to acquire the unit at the then fair value.


(7)	The joint venture owns two mezzanine notes secured by interests in the entity that owns 76 11th Avenue. The difference between our ownership interest and our economic interest results from our right to 50% of the total exit fee while each of our partners is entitled to receive 25% of the total exit fee.


(8)	The Company was granted an option to purchase the interest at an agreed upon valuation in July 2014 when it originated a $50.0 million mezzanine loan to the project's developer. The mezzanine loan was repaid prior to the closing of the Company's acquisition of its joint venture interest.

Acquisition, Development and Construction Arrangements

Based on the characteristics of the following arrangements, which are similar to those of an investment, combined with the expected residual profit of not greater than 50%, we have accounted for these debt and preferred equity investments under the equity method. As of June 30, 2016 and December 31, 2015, the carrying value for acquisition, development and construction arrangements were as follows (in thousands):



Loan Type	June 30, 2016		December 31, 2015		Initial Maturity Date
Mezzanine loan and preferred equity	$	100,000	$	99,936	March 2017
Mezzanine loan⁽¹⁾	45,719		45,942		February 2022
	$	145,719	$	145,878


(1)	We have an option to convert our loan to an equity interest subject to certain conditions. We have determined that our option to convert the loan to equity is not a derivative financial instrument pursuant to GAAP.

Sale of Joint Venture Interest or Property

The following table summarizes the investments in unconsolidated joint ventures sold during the six months ended June 30, 2016:



Property	Ownership Percentage	Disposition Date	Type of Sale	Gross Asset Valuation (in thousands)⁽¹⁾		Gain on Sale (in thousands)⁽²⁾
1 Jericho Plaza ⁽³⁾	66.11%	February 2016	Office	$	95,200	$	3,300
7 Renaissance Square	50.00%	March 2016	Office	$	20,700	$	4,200
EOP Denver	4.79%	March 2016	Office	$	180,700	$	2,800
33 Beekman ⁽⁴⁾	45.90%	May 2016	Residential	$	196,000	$	33,000


(1)	Represents implied gross valuation for the joint venture or sales price of the property.


(2)	Represents the Company's share of the gain. The gain on sale is net of $1.1 million employee compensation awards accrued in connection with the realization of these investment gains as a bonus to certain employees that were instrumental in realizing the gains on sale.


(3)	Our ownership percentage was reduced in the first quarter of 2016, from 77.78% to 11.67%, upon completion of the restructuring of the joint venture.


(4)	In connection with the sale of the property, we also recognized a promote of $10.8 million.

Mortgages and Other Loans Payable

We generally finance our joint ventures with non-recourse debt. However, in certain cases we have provided guarantees or master leases for tenant space. These guarantees and master leases terminate upon the satisfaction of specified circumstances or repayment of the underlying loans. The first mortgage notes and other loans payable collateralized by the respective joint venture properties and assignment of leases at June 30, 2016 and December 31, 2015, respectively, are as follows (amounts in thousands):



Property	Maturity Date	Interest Rate⁽¹⁾		June 30, 2016		December 31, 2015
Fixed Rate Debt:
1745 Broadway	January 2017	5.68	%	$	340,000	$	340,000
521 Fifth Avenue	November 2019	3.73	%	170,000		170,000
717 Fifth Avenue⁽²⁾	July 2022	4.45	%	300,000		300,000
717 Fifth Avenue⁽²⁾	July 2022	6.27	%	355,328		325,704
21 East 66th Street	April 2023	3.60	%	12,000		12,000
3 Columbus Circle	March 2025	3.61	%	350,000		350,000
800 Third Avenue	February 2026	3.17	%	177,000		20,910
Stonehenge Portfolio⁽³⁾	Various	4.19	%	364,249		430,627
280 Park Avenue				—		692,963



Property	Maturity Date	Interest Rate⁽¹⁾		June 30, 2016			December 31, 2015
7 Renaissance Square				—			2,927
Total fixed rate debt				$	2,068,577		$	2,645,131
Floating Rate Debt:
650 Fifth Avenue ⁽⁴⁾	October 2016	3.94	%	$	65,000		$	65,000
175-225 Third Street	December 2016	4.50	%	40,000			40,000
10 East 53rd Street	February 2017	2.94	%	125,000			125,000
724 Fifth Avenue	April 2017	2.86	%	275,000			275,000
1552 Broadway ⁽⁵⁾	April 2017	4.66	%	185,410			190,409
55 West 46th Street ⁽⁶⁾	October 2017	2.74	%	151,536			150,000
Jericho Plaza⁽⁷⁾	March 2018	4.59	%	75,799			163,750
605 West 42nd Street	July 2018	2.56	%	539,000			—
280 Park Avenue	June 2019	2.44	%	900,000			30,000
121 Greene Street	November 2019	1.94	%	15,000			15,000
131-137 Spring Street	August 2020	1.99	%	141,000			141,000
11 West 34th Street	January 2021	1.89	%	23,000			23,000
100 Park Avenue	February 2021	2.19	%	360,000			360,000
21 East 66th Street	June 2033	2.00	%	1,765			1,805
Stonehenge Portfolio⁽⁸⁾	Various	5.81	%	65,489			10,500
33 Beekman				—			73,518
Total floating rate debt				$	2,962,999		$	1,663,982
Total joint venture mortgages and other loans payable				$	5,031,576		$	4,309,113
Deferred financing costs, net				(109,083		)	(42,565		)
Total joint venture mortgages and other loans payable, net				$	4,922,493		$	4,266,548


(1)	Effective weighted average interest rate for the three months ended June 30, 2016, taking into account interest rate hedges in effect during the period.


(2)	These loans are comprised of a $300.0 million fixed rate mortgage loan and $355.3 million mezzanine loan. The mezzanine loan is subject to accretion based on the difference between contractual interest rate and contractual pay rate.


(3)	Amount is comprised of $13.2 million, $34.6 million, , $140.3 million, and $176.2 million in fixed-rate mortgages that mature in October 2016, November 2017, August 2019, and June 2024, respectively.


(4)	This loan has a committed amount of $97.0 million, of which $32.0 million was unfunded as of June 30, 2016.


(5)	These loans are comprised of a $145.0 million mortgage loan and a $41.5 million mezzanine loan. As of June 30, 2016, $0.6 million of the mortgage loan and $0.5 million of the mezzanine loan were unfunded.


(6)	This loan has a committed amount of $190.0 million, of which $38.5 million was unfunded as of June 30, 2016.


(7)	We hold an 11.67% non-controlling interest in the joint venture and the property secures a two year $100.0 million loan, of which $75.8 million is currently outstanding.


(8)	Amount is comprised of $55.2 million and $10.3 million in floating-rate mortgages that mature in June 2017 and December 2017, respectively.

We act as the operating partner and day-to-day manager for all our joint ventures, except for 800 Third Avenue, Jericho Plaza, 280 Park Avenue, 3 Columbus Circle, 21 East 66th Street, 175-225 Third Street, 605 West 42nd Street and the Stonehenge Portfolio. We are entitled to receive fees for providing management, leasing, construction supervision and asset management services to certain of our joint ventures. We incurred a $2.0 million loss and earned $2.5 million, $2.1 million and $4.9 million from these services for the three and six months ended June 2016 and 2015, respectively. In addition, we have the ability to earn incentive fees based on the ultimate financial performance of certain of the joint venture properties.

The combined balance sheets for the unconsolidated joint ventures, at June 30, 2016 and December 31, 2015 are as follows (in thousands):



	June 30, 2016		December 31, 2015
Assets
Commercial real estate property, net	$	6,510,775	$	6,122,468
Debt and preferred equity investments, net	304,901		145,878
Other assets	741,839		715,840
Total assets	$	7,557,515	$	6,984,186
Liabilities and members' equity
Mortgages and other loans payable, net	$	4,922,493	$	4,266,548
Other liabilities	534,611		523,160
Members' equity	2,100,411		2,194,478
Total liabilities and members' equity	$	7,557,515	$	6,984,186
Company's investments in unconsolidated joint ventures	$	1,126,486	$	1,203,858

The combined statements of operations for the unconsolidated joint ventures, from acquisition date through the three and six months ended June 30, 2016 and 2015, are as follows (in thousands):



	Three Months Ended June 30,					Six Months Ended June 30,
	2016		2015			2016			2015
Total revenues	$	151,575	$	143,535		$	314,087		$	272,451
Operating expenses	27,166		26,345			54,420			51,831
Ground rent	3,715		2,572			6,926			5,164
Real estate taxes	24,332		22,335			48,542			41,711
Interest expense, net of interest income	46,351		51,715			96,087			95,722
Amortization of deferred financing costs	7,276		3,145			10,512			6,155
Transaction related costs	—		3			—			11
Depreciation and amortization	37,294		37,894			75,145			70,878
Total expenses	146,134		144,009			291,632			271,472
Loss on early extinguishment of debt	—		—			(1,606		)	(833		)
Net income (loss) before gain on sale	$	5,441	$	(474	)	$	20,849		$	146
Company's equity in net income from unconsolidated joint ventures	$	5,841	$	2,994		$	15,937		$	7,024

Deferred Costs

6 Months Ended

Jun. 30, 2016

Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]

Deferred Costs

Deferred costs at June 30, 2016 and December 31, 2015 consisted of the following (in thousands):



	June 30, 2016			December 31, 2015
Deferred leasing	$	447,805		$	415,406
Less: accumulated amortization	(191,502		)	(175,486		)
Deferred costs, net	$	256,303		$	239,920

Mortgages and Other Loans Payable

6 Months Ended

Jun. 30, 2016

Mortgages and Other Loans Payable

Mortgages and Other Loans Payable

The first mortgages and other loans payable collateralized by the respective properties and assignment of leases or debt investments at June 30, 2016 and December 31, 2015, respectively, were as follows (amounts in thousands):



Property	Maturity Date	Interest Rate⁽¹⁾		June 30, 2016			December 31, 2015
Fixed Rate Debt:
Landmark Square	December 2016	4.00	%	$	78,682		$	79,562
FHLB Facility	January 2017	1.03	%	105,000			—
FHLB Facility	January 2017	0.80	%	100,000			—
485 Lexington Avenue	February 2017	5.61	%	450,000			450,000
762 Madison Avenue	February 2017	3.86	%	7,784			7,872
885 Third Avenue⁽²⁾	July 2017	6.26	%	267,650			267,650
Unsecured Loan	June 2018	4.81	%	16,000			16,000
One Madison Avenue	May 2020	5.91	%	530,876			542,817
100 Church Street	July 2022	4.68	%	223,294			225,099
919 Third Avenue⁽³⁾	June 2023	5.12	%	500,000			500,000
400 East 57th Street	February 2024	4.13	%	66,998			67,644
400 East 58th Street	February 2024	4.13	%	28,713			28,990
420 Lexington Avenue	October 2024	3.99	%	300,000			300,000
1515 Broadway	March 2025	3.93	%	896,248			900,000
11 Madison Avenue	September 2025	3.84	%	1,400,000			1,400,000
Series J Preferred Units⁽⁴⁾	April 2051	3.75	%	4,000			4,000
388-390 Greenwich Street⁽⁵⁾				—			1,004,000
500 West Putnam Avenue⁽⁶⁾				—			22,376
Total fixed rate debt				$	4,975,245		$	5,816,010
Floating Rate Debt:
Master Repurchase Agreement⁽⁷⁾	July 2016	3.59	%	$	134,259		$	253,424
FHLB Facility	December 2016	0.72	%	24,000			45,750
600 Lexington Avenue	October 2017	2.63	%	110,857			112,795
719 Seventh Avenue	February 2018	3.49	%	27,514			—
183,187 Broadway & 5-7 Dey Street	May 2018	3.11	%	58,000			40,000
1080 Amsterdam	November 2018	4.19	%	3,525			3,525
220 East 42nd Street	October 2020	2.04	%	275,000			275,000
388-390 Greenwich Street⁽⁵⁾				—			446,000
248-252 Bedford Avenue⁽⁸⁾				—			29,000
Total floating rate debt				$	633,155		$	1,205,494
Total fixed rate and floating rate debt				$	5,608,400		$	7,021,504
Mortgages reclassed to liabilities related to assets held for sale⁽⁵⁾⁽⁸⁾				—			(29,000		)
Total mortgages and other loans payable				$	5,608,400		$	6,992,504
Deferred financing costs, net of amortization				(84,290		)	(110,584		)
Total mortgages and other loans payable, net				$	5,524,110		$	6,881,920


(1)	Effective weighted average interest rate for the quarter ended June 30, 2016, taking into account interest rate hedges in effect during the period.


(2)	In February 2016, we closed on the sale of 885 Third Avenue. The sale did not meet the criteria for sale accounting and as a result the property remains on our consolidated balance sheet until the criteria is met.


(3)	We own a 51.0% controlling interest in the consolidated joint venture that is the borrower on this loan.

(4)

In connection with the acquisition of a commercial real estate property, the Operating Partnership issued $4.0 million, 3.75% Series J Preferred Units of limited partnership interest, or the Series J Preferred Units, with a mandatory liquidation preference of $1,000.00 per unit. The Series J Preferred Units are accounted for as debt because they can be redeemed in cash by the Operating Partnership on the earlier of (i) the date of the sale of the property or (ii) April 30, 2051 or at the option of the unitholders as provided for in the related agreement.


(5)	In June 2016, we closed on the sale of 388-390 Greenwich Street. At March 31, 2016, this property was classified as a held for sale property and the related mortgage, net of deferred financing costs, net of amortization of $24.5 million, was included in liabilities related to assets held for sale.


(6)	In January 2016, the mortgage was repaid.


(7)	In July 2016, we entered into a new Master Repurchase Agreement, with a maximum facility capacity of $300.0 million that bears interest ranging from 225 and 400 basis points over 30-day LIBOR, depending on the pledged collateral. The new MRA has an initial maturity date of July 2018, with an extension term of one additional year.


(8)	The property at 248-252 Bedford Avenue in Brooklyn, New York was sold in February 2016. At December 31, 2015 this property was held for sale and the related mortgage, net of deferred financing, net of amortization costs of $0.9 million, was included in liabilities related to assets held for sale.

Federal Home Loan Bank of New York Facility

The Company’s wholly-owned subsidiary, Belmont Insurance Company, or Belmont, a New York licensed captive insurance company, is a member of the Federal Home Loan Bank of New York, or FHLBNY. As a member, Belmont may borrow funds from the FHLBNY in the form of secured advances. As of June 30, 2016, we had $229.0 million in outstanding secured advances with a weighted average borrowing rate of 0.90%.

On January 12, 2016, the Federal Housing Finance Agency, or FHFA, adopted a final regulation on Federal Home Loan Bank, or FHLB, membership. The rule excludes captive insurance entities from FHLB membership on a going-forward basis and provides termination rules for current captive insurance members. Unless the final rule is modified, Belmont's membership will terminate on February 19, 2017, at which point we would be required to repay all funds borrowed from the FHLBNY.

Master Repurchase Agreement

The Master Repurchase Agreement, as amended in December 2013, or MRA, provides us with the ability to sell certain debt investments with a simultaneous agreement to repurchase the same at a certain date or on demand. This MRA has a maximum facility capacity of $300.0 million and bears interest ranging from 250 and 325 basis points over 30-day LIBOR depending on the pledged collateral. Since December 6, 2015, we have been required to pay monthly in arrears a 25 basis point fee on the excess of $150.0 million over the average daily balance during the period if the average daily balance is less than $150.0 million. We seek to mitigate risks associated with our repurchase agreement by managing the credit quality of our assets, early repayments, interest rate volatility, liquidity, and market value. The margin call provisions under our repurchase facility permit valuation adjustments based on capital markets activity, and are not limited to collateral-specific credit marks. To monitor credit risk associated with our debt investments, our asset management team regularly reviews our investment portfolio and is in contact with our borrowers in order to monitor the collateral and enforce our rights as necessary. The risk associated with potential margin calls is further mitigated by our ability to recollateralize the facility with additional assets from our portfolio of debt investments, our ability to satisfy margin calls with cash or cash equivalents and access to additional liquidity through the 2012 credit facility, as defined below.

At June 30, 2016 and December 31, 2015, the gross book value of the properties and debt and preferred equity investments collateralizing the mortgages and other loans payable, not including assets held for sale, was approximately $8.7 billion and $10.8 billion, respectively.

In July 2016, we entered into a new Master Repurchase Agreement, with a maximum facility capacity of $300.0 million that bears interest ranging from 225 and 400 basis points over 30-day LIBOR depending on the pledged collateral. The new MRA has an initial maturity date of July 2018, with an extension term of one additional year.

Corporate Indebtedness

6 Months Ended

Jun. 30, 2016

Debt Disclosure [Abstract]

Corporate Indebtedness

2012 Credit Facility

In July 2015, we entered into the third amendment to the credit facility that was originally entered into by the Company in November 2012, referred to as the 2012 credit facility. As of June 30, 2016, the 2012 credit facility, as amended, consisted of a $1.6 billion revolving credit facility and a $933.0 million term loan, with a maturity date of March 29, 2019 and June 30, 2019, respectively. The revolving credit facility has an as-of-right extension to March 29, 2020. We also have an option, subject to customary conditions, to increase the capacity under the revolving credit facility to $3.0 billion at any time prior to the maturity date for the revolving credit facility without the consent of existing lenders, by obtaining additional commitments from our existing lenders and other financial institutions.

As of June 30, 2016, the 2012 credit facility bore interest at a spread over LIBOR ranging from (i) 87.5 basis points to 155 basis points for loans under the revolving credit facility and (ii) 95 basis points to 190 basis points for loans under the term loan facility, in each case based on the credit rating assigned to the senior unsecured long term indebtedness of ROP.

At June 30, 2016, the applicable spread was 125 basis points for the revolving credit facility and 140 basis points for the term loan facility. At June 30, 2016, the effective interest rate was 1.69% for the revolving credit facility and 1.95% for the term loan facility. We are required to pay quarterly in arrears a 12.5 to 30 basis point facility fee on the total commitments under the revolving credit facility based on the credit rating assigned to the senior unsecured long term indebtedness of ROP. As of June 30, 2016, the facility fee was 25 basis points.

As of June 30, 2016, we had $73.6 million of outstanding letters of credit, $285.0 million drawn under the revolving credit facility and $933.0 million outstanding under the term loan facility, with total undrawn capacity of $1.2 billion under the 2012 credit facility. At June 30, 2016 and December 31, 2015 the revolving credit facility had a carrying value of $277.4 million and $985.1 million, respectively, net of deferred financing costs. At June 30, 2016 and December 31, 2015, the term loan facility had a carrying value of $930.0 million and $929.5 million, respectively, net of deferred financing costs.

The Company, the Operating Partnership and ROP are all borrowers jointly and severally obligated under the 2012 credit facility. None of our other subsidiaries are obligors under the 2012 credit facility.

The 2012 credit facility includes certain restrictions and covenants (see Restrictive Covenants below).

Senior Unsecured Notes

The following table sets forth our senior unsecured notes and other related disclosures as of June 30, 2016 and December 31, 2015, respectively, by scheduled maturity date (dollars in thousands):



Issuance	June 30, 2016 Unpaid Principal Balance		June 30, 2016 Accreted Balance			December 31, 2015 Accreted Balance			Coupon Rate⁽¹⁾		Effective Rate		Term (in Years)	Maturity Date
October 12, 2010⁽²⁾	$	345,000	$	327,489		$	321,130		3.00	%	3.00	%	7	October 2017
August 5, 2011⁽³⁾	250,000		249,845			249,810			5.00	%	5.00	%	7	August 2018
March 16, 2010⁽³⁾	250,000		250,000			250,000			7.75	%	7.75	%	10	March 2020
November 15, 2012⁽³⁾	200,000		200,000			200,000			4.50	%	4.50	%	10	December 2022
December 17, 2015⁽³⁾	100,000		100,000			100,000			4.27	%	4.27	%	10	December 2025
March 26, 2007⁽⁴⁾	10,008		10,008			10,008			3.00	%	3.00	%	20	March 2027
March 31, 2006⁽⁵⁾	—		—			255,296
	$	1,155,008	$	1,137,342		$	1,386,244
Deferred financing costs, net			(6,652		)	(7,280		)
	$	1,155,008	$	1,130,690		$	1,378,964


(1)	Interest on the senior unsecured notes is payable semi-annually with principal and unpaid interest due on the scheduled maturity dates.

(2)

Issued by the Operating Partnership. Interest on these exchangeable notes is payable semi-annually on April 15 and October 15. The notes had an initial exchange rate representing an exchange price that was set at a 30.0% premium to the last reported sale price of SL Green's common stock on October 6, 2010, or $85.81. The initial exchange rate is subject to adjustment under certain circumstances. The current exchange rate is 12.4998 shares of SL Green's common stock per $1,000 principal amount of these notes. The notes are senior unsecured obligations of the Operating Partnership and are exchangeable upon the occurrence of specified events and during the period beginning on the twenty-second scheduled trading day prior to the maturity date and ending on the second business day prior to the maturity date, into cash or a combination of cash and shares of SL Green's common stock, if any, at our option. As a result of meeting specified events (as defined in the Indenture Agreement), these notes became exchangeable commencing January 1, 2016 and remained exchangeable through March 31, 2016. The notes are guaranteed by ROP. On the issuance date, $78.3 million of the debt balance was recorded in equity. As of June 30, 2016, $17.5 million remained to be amortized into the debt balance.


(3)	Issued by the Company, the Operating Partnership and ROP, as co-obligors.

(4)

Issued by the Operating Partnership. Interest on these remaining exchangeable notes is payable semi-annually on March 30 and September 30. The notes have an initial exchange rate representing an exchange price that was set at a 25.0% premium to the last reported sale price of the Company's common stock on March 20, 2007, or $173.30. The initial exchange rate is subject to adjustment under certain circumstances. The current exchange rate is 5.7985 shares of SL Green's common stock per $1,000 principal amount of these notes. The notes are senior unsecured obligations of the Operating Partnership and are exchangeable upon the occurrence of specified events and during the period beginning on the twenty-second scheduled trading day prior to the maturity date and ending on the second business day prior to the maturity date, into cash or a combination of cash and shares of SL Green's common stock, if any, at our option. The notes are currently redeemable at the Operating Partnership’s option. The Operating Partnership may be required to repurchase the notes on March 30, 2017 and 2022, and upon the occurrence of certain designated events.


(5)	Issued by ROP, balance was repaid in March 2016.

Restrictive Covenants

The terms of the 2012 credit facility, as amended, and certain of our senior unsecured notes include certain restrictions and covenants which may limit, among other things, our ability to pay dividends, make certain types of investments, incur additional indebtedness, incur liens and enter into negative pledge agreements and dispose of assets, and which require compliance with financial ratios relating to the maximum ratio of total indebtedness to total asset value, a minimum ratio of EBITDA to fixed charges, a maximum ratio of secured indebtedness to total asset value and a maximum ratio of unsecured indebtedness to unencumbered asset value. The dividend restriction referred to above provides that, we will not during any time when a default is continuing, make distributions with respect to common stock or other equity interests, except to enable the Company to continue to qualify as a REIT for Federal income tax purposes. As of June 30, 2016 and 2015, we were in compliance with all such covenants.

Junior Subordinated Deferrable Interest Debentures

In June 2005, the Company and the Operating Partnership issued $100.0 million in unsecured trust preferred securities through a newly formed trust, SL Green Capital Trust I, or the Trust, which is a wholly-owned subsidiary of the Operating Partnership. The securities mature in 2035 and bear interest at 125 basis points over the three-month LIBOR. Interest payments may be deferred for a period of up to eight consecutive quarters if the Operating Partnership exercises its right to defer such payments. The Trust preferred securities are redeemable at the option of the Operating Partnership, in whole or in part, with no prepayment premium. We do not consolidate the Trust even though it is a variable interest entity as we are not the primary beneficiary. Because the Trust is not consolidated, we have recorded the debt on our consolidated balance sheets and the related payments are classified as interest expense.

Principal Maturities

Combined aggregate principal maturities of mortgages and other loans payable, 2012 credit facility, trust preferred securities, senior unsecured notes and our share of joint venture debt as of June 30, 2016, including as-of-right extension options and put options, were as follows (in thousands):



	Scheduled Amortization		Principal		Revolving Credit Facility		Unsecured Term Loan		Trust Preferred Securities		Senior Unsecured Notes		Total		Joint Venture Debt
Remaining 2016	$	29,859	$	236,194	$	—	$	—	$	—	$	—	$	266,053	$	163,575
2017	63,644		1,094,548		—		—		—		355,008		1,513,200		549,135
2018	64,119		47,039		—		—		—		250,000		361,158		9,293
2019	70,255		—		—		933,000		—		—		1,003,255		554,686
2020	52,799		679,531		285,000		—		—		250,000		1,267,330		30,298
Thereafter	147,604		3,122,974		—		—		100,000		300,000		3,670,578		547,167
	$	428,280	$	5,180,286	$	285,000	$	933,000	$	100,000	$	1,155,008	$	8,081,574	$	1,854,154

Consolidated interest expense, excluding capitalized interest, was comprised of the following (in thousands):



	Three Months Ended June 30,						Six Months Ended June 30,
	2016			2015			2016			2015
Interest expense	$	95,568		$	84,083		$	197,722		$	169,099
Interest capitalized	(5,433		)	(7,611		)	(12,051		)	(16,169		)
Interest income	(1,046		)	(726		)	(1,910		)	(1,377		)
Interest expense, net	$	89,089		$	75,746		$	183,761		$	151,553

Related Party Transactions

6 Months Ended

Jun. 30, 2016

Related Party Transactions

Cleaning/ Security/ Messenger and Restoration Services

Alliance Building Services, or Alliance, and its affiliates are partially owned by Gary Green, a son of Stephen L. Green, the chairman of SL Green's board of directors, and provide services to certain properties owned by us. Alliance’s affiliates include First Quality Maintenance, L.P., or First Quality, Classic Security LLC, Bright Star Couriers LLC and Onyx Restoration Works, and provide cleaning, extermination, security, messenger, and restoration services, respectively. In addition, First Quality has the non-exclusive opportunity to provide cleaning and related services to individual tenants at our properties on a basis separately negotiated with any tenant seeking such additional services. The Service Corporation has entered into an arrangement with Alliance whereby it will receive a profit participation above a certain threshold for services provided by Alliance to certain tenants at certain buildings above the base services specified in their lease agreements. Income earned from profit participation, which is included in other income on the consolidated statements of operations, was $0.9 million, $1.7 million, $1.0 million and $1.9 million for the three and six months ended June 30, 2016 and 2015, respectively. We also recorded expenses, inclusive of capitalized expenses of $7.1 million, $10.9 million, $4.6 million, and $8.6 million for the three and six months ended June 30, 2016 and 2015, respectively, for these services (excluding services provided directly to tenants).

Management Fees

S.L. Green Management Corp., a consolidated entity, receives property management fees from an entity in which Stephen L. Green owns an interest. We received management fees from this entity of $0.1 million and $0.2 million for the three and six months ended June 30, 2016 and 2015.

Other

Amounts due from related parties at June 30, 2016 and December 31, 2015 consisted of the following (in thousands):



	June 30, 2016		December 31, 2015
Due from joint ventures	$	1,443	$	1,334
Other	11,616		9,316
Related party receivables	$	13,059	$	10,650

Noncontrolling Interests on the Company's Consolidated Financial Statements

6 Months Ended

Jun. 30, 2016

Noncontrolling Interest [Abstract]

Noncontrolling Interests on the Company's Consolidated Financial Statements

Noncontrolling interests represent the common and preferred units of limited partnership interest in the Operating Partnership not held by the Company as well as third party equity interests in our other consolidated subsidiaries. Noncontrolling interests in the Operating Partnership are shown in mezzanine equity while the noncontrolling interests in our other consolidated subsidiaries are shown in the equity section of the Company’s consolidated financial statements.

Common Units of Limited Partnership Interest in the Operating Partnership

As of June 30, 2016 and December 31, 2015, the noncontrolling interest unit holders owned 4.30%, or 4,504,212 units, and 3.61%, or 3,745,766 units, of the Operating Partnership, respectively. At June 30, 2016, 4,504,212 shares of SL Green's common stock were reserved for issuance upon the redemption of units of limited partnership interest of the Operating Partnership.

Noncontrolling interests in the Operating Partnership is recorded at the greater of its cost basis or fair market value based on the closing stock price of SL Green's common stock at the end of the reporting period.

Below is the rollforward analysis of the activity relating to the noncontrolling interests in the Operating Partnership as of June 30, 2016 and December 31, 2015 (in thousands):



	June 30, 2016			December 31, 2015
Balance at beginning of period	$	424,206		$	469,524
Distributions	(6,009		)	(9,710		)
Issuance of common units	73,011			30,506
Redemption of common units	(11,795		)	(55,697		)
Net income	6,508			10,565
Accumulated other comprehensive income allocation	(375		)	(67		)
Fair value adjustment	906			(20,915		)
Balance at end of period	$	486,452		$	424,206

Preferred Units of Limited Partnership Interest in the Operating Partnership

The Operating Partnership has 1,902,000 4.50% Series G Preferred Units of limited partnership interest, or the Series G Preferred Units outstanding, with a liquidation preference of $25.00 per unit, which were issued in January 2012 in conjunction with an acquisition. The Series G Preferred unitholders receive annual dividends of $1.125 per unit paid on a quarterly basis and dividends are cumulative, subject to certain provisions. The Series G Preferred Units are convertible into a number of common units of limited partnership interest in the Operating Partnership equal to (i) the liquidation preference plus accumulated and unpaid distributions on the conversion date divided by (ii) $88.50. The common units of limited partnership interest in the Operating Partnership may be redeemed in exchange for SL Green's common stock on a 1-to-1 basis. The Series G Preferred Units also provide the holder with the right to require the Operating Partnership to repurchase the Series G Preferred Units for cash before January 31, 2022.

The Operating Partnership has 60 Series F Preferred Units outstanding with a mandatory liquidation preference of $1,000.00 per unit.

The Operating Partnership has authorized up to 700,000 3.50% Series K Preferred Units of limited partnership interest, or the Series K Preferred Units, with a liquidation preference of $25.00 per unit. In August 2014, the Company issued 563,954 Series K Preferred Units in conjunction with an acquisition. The Series K Preferred unitholders receive annual dividends of $0.875 per unit paid on a quarterly basis and dividends are cumulative, subject to certain provisions. The Series K Preferred Units can be redeemed at any time, at the option of the unitholder, either for cash or are convertible into a number of common units of limited partnership interest in the Operating Partnership equal to (i) the liquidation preference plus accumulated and unpaid distributions on the conversion date divided by (ii) $134.67.

The Operating Partnership has authorized up to 500,000 4.00% Series L Preferred Units of limited partnership interest, or the Series L Preferred Units, with a liquidation preference of $25.00 per unit. In August 2014, the Company issued 378,634 Series L Preferred Units in conjunction with an acquisition. The Series L Preferred unitholders receive annual dividends of $1.00 per unit paid on a quarterly basis and dividends are cumulative, subject to certain provisions. The Series L Preferred Units can be redeemed at any time at par for cash at the option of the unitholder.

The Operating Partnership has authorized up to 1,600,000 3.75% Series M Preferred Units of limited partnership interest, or the Series M Preferred Units, with a liquidation preference of $25.00 per unit. In February 2015, the Company issued 1,600,000 Series M Preferred Units in conjunction with the acquisition of ownership interests in and relating to certain residential and retail real estate properties. The Series M Preferred unitholders receive annual dividends of $0.9375 per unit paid on a quarterly basis and dividends are cumulative, subject to certain provisions. The Series M Preferred Units can be redeemed at any time at par for cash at the option of the unitholder.

The Operating Partnership has authorized up to 552,303 3.00% Series N Preferred Units of limited partnership interest, or the Series N Preferred Units, with a liquidation preference of $25.00 per unit. In June 2015, the Company issued 552,303 Series N Preferred Units in conjunction with an acquisition. The Series N Preferred unitholders receive annual dividends of $0.75 per unit paid on a quarterly basis and dividends are cumulative, subject to certain provisions. The Series N Preferred Units can be redeemed at any time at par for cash at the option of the unitholder.

The Operating Partnership has authorized an aggregate of one 6.25% Series O Preferred Unit of limited partnership interest, or the Series O Preferred Unit. In June 2015, the Company issued the Series O Preferred Unit in connection with an acquisition.

The Operating Partnership has authorized up to 200,000 4.00% Series P Preferred Units of limited partnership interest, or the Series P Preferred Units, with a liquidation preference of $25.00 per unit. In July 2015, the Company issued 200,000 Series P Preferred Units in conjunction with an acquisition. The Series P Preferred unitholders receive annual dividends of $1.00 per unit paid on a quarterly basis and dividends are cumulative, subject to certain provisions. The Series P Preferred Units can be redeemed at any time at par for cash at the option of the unitholder.

The Operating Partnership has authorized up to 268,000 3.50% Series Q Preferred Units of limited partnership interest, or the Series Q Preferred Units, with a liquidation preference of $25.00 per unit. In July 2015, the Company issued 268,000 Series Q Preferred Units in conjunction with an acquisition. The Series Q Preferred unitholders receive annual dividends of $0.875 per unit paid on a quarterly basis and dividends are cumulative, subject to certain provisions. The Series Q Preferred Units can be redeemed at any time, at the option of the unitholder, either for cash or are convertible into a number of common units of limited partnership interest in the Operating Partnership equal to (i) the liquidation preference plus accumulated and unpaid distributions on the conversion date divided by (ii) $148.95.

The Operating Partnership has authorized up to 400,000 3.50% Series R Preferred Units of limited partnership interest, or the Series R Preferred Units, with a liquidation preference of $25.00 per unit. In August 2015, the Company issued 400,000 Series R Preferred Units in conjunction with an acquisition. The Series R Preferred unitholders receive annual dividends of $0.875 per unit paid on a quarterly basis and dividends are cumulative, subject to certain provisions. The Series R Preferred Units can be redeemed at any time, at the option of the unitholder, either for cash or are convertible into a number of common units of limited partnership interest in the Operating Partnership equal to (i) the liquidation preference plus accumulated and unpaid distributions on the conversion date divided by (ii) $154.89.

The Operating Partnership has authorized up to 1,077,280 4.00% Series S Preferred Units of limited partnership interest, or the Series S Preferred Units, with a liquidation preference of $25.00 per unit. In August 2015, the Company issued 1,077,280 Series S Preferred Units in conjunction with an acquisition. The Series S Preferred unitholders receive annual dividends of $1.00 per unit paid on a quarterly basis and dividends are cumulative, subject to certain provisions. The Series S Preferred Units can be redeemed at any time at par for cash at the option of the unitholder.

The Operating Partnership has authorized up to 230,000 2.75% Series T Preferred Units of limited partnership interest, or the Series T Preferred Units, with a liquidation preference of $25.00 per unit. In March 2016, the Company issued 230,000 Series T Preferred Units in conjunction with an acquisition. The Series T Preferred unitholders receive annual dividends of $0.6875 per unit paid on a quarterly basis and dividends are cumulative, subject to certain provisions. The Series T Preferred Units can be redeemed at any time, at the option of the unitholder, either for cash or are convertible into a number of common units of limited partnership interest in the Operating Partnership equal to (i) the liquidation preference plus accumulated and unpaid distributions on the conversion date divided by (ii) $119.02.

The Operating Partnership has authorized up to 680,000 4.50% Series U Preferred Units of limited partnership interest, or the Series U Preferred Units, with a liquidation preference of $25.00 per unit. In March 2016, the Company issued 680,000 Series U Preferred Units in conjunction with an acquisition. The Series U Preferred unitholders initially receive annual dividends of $1.125 per unit paid on a quarterly basis and dividends are cumulative, subject to certain provisions. The annual dividend is subject to reduction upon the occurence of certain circumstances set forth in the terms of the Series U Preferred Units. The minimum annual dividend is $0.75 per unit. The Series U Preferred Units can be redeemed at any time at par for cash at the option of the unitholder.

Through a consolidated subsidiary, we have authorized up to 109,161 3.5% Series A Preferred Units of limited partnership interest, or the Greene Series A Preferred Units, with a liquidation preference of $1,000.00 per unit. In August 2015, the Company issued 109,161 Greene Series A Preferred Units in conjunction with an acquisition. The Greene Series A Preferred unitholders receive annual dividends of $35.00 per unit paid on a quarterly basis and dividends are cumulative, subject to certain provisions. The Greene Series A Preferred Units can be redeemed at any time, at the option of the unitholder, either for cash or are convertible on a one-for-one basis, into the Series B Preferred Units of limited partnership interest, or the Greene Series B Preferred Units. The Greene Series B Preferred Units can be converted at any time, at the option of the unitholder, into a number of common stock equal to 6.71348 shares of common stock for each Greene Series B Preferred Unit. As of June 30, 2016, no Greene Series B Preferred Units have been issued.

Below is the rollforward analysis of the activity relating to the preferred units in the Operating Partnership as of June 30, 2016 and December 31, 2015 (in thousands):



	June 30, 2016			December 31, 2015
Balance at beginning of period	$	282,516		$	71,115
Issuance of preferred units	22,793			211,601
Redemption of preferred units	(2,849		)	(200		)
Balance at end of period	$	302,460		$	282,516

Stockholders' Equity of the Company

6 Months Ended

Jun. 30, 2016

Stockholders' Equity Note [Abstract]

Stockholders' Equity of the Company

Stockholders’ Equity of the Company

Common Stock

Our authorized capital stock consists of 260,000,000 shares, $0.01 par value per share, consisting of 160,000,000 shares of common stock, $0.01 par value per share, 75,000,000 shares of excess stock, at $0.01 par value per share, and 25,000,000 shares of preferred stock, par value $0.01 per share. As of June 30, 2016, 100,164,358 shares of common stock and no shares of excess stock were issued and outstanding.

At-The-Market Equity Offering Program

In March 2015, the Company, along with the Operating Partnership, entered into a new "at-the-market" equity offering program, or ATM Program, to sell an aggregate of $300.0 million of SL Green's common stock. During the year ended December 31, 2015, we sold 91,180 shares of our common stock for aggregate net proceeds of $12.0 million. The net proceeds from these offerings were contributed to the Operating Partnership in exchange for 91,180 units of limited partnership interest of the Operating Partnership. The Company did not make any sales of its common stock under an ATM program in the first six months of 2016.

Perpetual Preferred Stock

We have 9,200,000 shares of our 6.50% Series I Cumulative Redeemable Preferred Stock, or the Series I Preferred Stock, outstanding with a mandatory liquidation preference of $25.00 per share. The Series I Preferred stockholders receive annual dividends of $1.625 per share paid on a quarterly basis and dividends are cumulative, subject to certain provisions. We are entitled to redeem the Series I Preferred Stock at par for cash at our option on or after August 10, 2017. In August 2012, we received $221.9 million in net proceeds from the issuance of the Series I Preferred Stock, which were recorded net of underwriters' discount and issuance costs, and contributed the net proceeds to the Operating Partnership in exchange for 9,200,000 units of 6.50% Series I Cumulative Redeemable Preferred Units of limited partnership interest, or the Series I Preferred Units.

Dividend Reinvestment and Stock Purchase Plan

In February 2015, the Company filed a registration statement with the SEC for our dividend reinvestment and stock purchase plan, or DRSPP, which automatically became effective upon filing. The Company registered 3,500,000 shares of SL Green's common stock under the DRSPP. The DRSPP commenced on September 24, 2001.

Earnings per Share

SL Green's earnings per share for the three and six months ended June 30, 2016 and 2015 are computed as follows (in thousands):



	Three Months Ended June 30,					Six Months Ended June 30,
Numerator	2016		2015			2016		2015
Basic Earnings:
Income (loss) attributable to SL Green common stockholders	$	133,457	$	(39,106	)	$	156,678	$	4,171
Effect of Dilutive Securities:
Redemption of units to common shares	5,586		—			6,508		166
Diluted Earnings:
Income (loss) attributable to SL Green common stockholders	$	139,043	$	(39,106	)	$	163,186	$	4,337



	Three Months Ended June 30,		Six Months Ended June 30,
Denominator	2016	2015	2016	2015
Basic Shares:
Weighted average common stock outstanding	100,134	99,579	100,093	98,994
Effect of Dilutive Securities:
Operating Partnership units redeemable for common shares	4,342	—	4,158	3,936
Stock-based compensation plans	316	—	282	493
Diluted weighted average common stock outstanding	104,792	99,579	104,533	103,423

SL Green has excluded 739,636, 228,122, 845,026 and 748,000 common stock equivalents from the diluted shares outstanding for the three and six months ended June 30, 2016 and 2015, respectively, as they were anti-dilutive. Additionally, SL Green has excluded 4,367,272 from the diluted shares outstanding for three months ended June 30, 2015 as they were anti-dilutive as a result of the net loss attributable to SL Green common stockholders.

- Definition

The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SAB Topic 4.E)
-URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21484-112644

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21488-112644

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(e))
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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-Paragraph 1
-Subparagraph (SX 210.5-02(31))
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
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-Section S99
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Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(30))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(d))
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Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
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-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 50
-Paragraph 2
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Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
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-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Preferred Stock
-URI http://asc.fasb.org/extlink&oid=6521494

Reference 15: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
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Reference 16: http://www.xbrl.org/2003/role/presentationRef
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+ Details

Partners' Capital of the Operating Partnership

6 Months Ended

Jun. 30, 2016

Stockholders' Equity

Partners' Capital of the Operating Partnership

Stockholders’ Equity of the Company

Common Stock

At-The-Market Equity Offering Program

Perpetual Preferred Stock

Dividend Reinvestment and Stock Purchase Plan

Earnings per Share

SL Green's earnings per share for the three and six months ended June 30, 2016 and 2015 are computed as follows (in thousands):



	Three Months Ended June 30,					Six Months Ended June 30,
Numerator	2016		2015			2016		2015
Basic Earnings:
Income (loss) attributable to SL Green common stockholders	$	133,457	$	(39,106	)	$	156,678	$	4,171
Effect of Dilutive Securities:
Redemption of units to common shares	5,586		—			6,508		166
Diluted Earnings:
Income (loss) attributable to SL Green common stockholders	$	139,043	$	(39,106	)	$	163,186	$	4,337



	Three Months Ended June 30,		Six Months Ended June 30,
Denominator	2016	2015	2016	2015
Basic Shares:
Weighted average common stock outstanding	100,134	99,579	100,093	98,994
Effect of Dilutive Securities:
Operating Partnership units redeemable for common shares	4,342	—	4,158	3,936
Stock-based compensation plans	316	—	282	493
Diluted weighted average common stock outstanding	104,792	99,579	104,533	103,423

SL Green Operating Partnership

Stockholders' Equity

Partners' Capital of the Operating Partnership

The Company is the sole general partner of the Operating Partnership and at June 30, 2016 owned 100,164,358 general and limited partnership interests in the Operating Partnership and 9,200,000 Series I Preferred Units. Partnership interests in the Operating Partnership are denominated as “common units of limited partnership interest” (also referred to as “OP Units”) or “preferred units of limited partnership interest” (also referred to as “Preferred Units”). All references to OP Units and Preferred Units outstanding exclude such units held by the Company. A holder of an OP Unit may present such OP Unit to the Operating Partnership for redemption at any time (subject to restrictions agreed upon at the issuance of OP Units to particular holders that may restrict such right for a period of time, generally one year from issuance). Upon presentation of an OP Unit for redemption, the Operating Partnership must redeem such OP Unit in exchange for the cash equal to the then value of a share of common stock of the Company, except that the Company may, at its election, in lieu of cash redemption, acquire such OP Unit for one share of common stock. Because the number of shares of common stock outstanding at all times equals the number of OP Units that the Company owns, one share of common stock is generally the economic equivalent of one OP Unit, and the quarterly distribution that may be paid to the holder of an OP Unit equals the quarterly dividend that may be paid to the holder of a share of common stock. Each series of Preferred Units makes a distribution that is set in accordance with an amendment to the partnership agreement of the Operating Partnership. Preferred Units may also be convertible into OP Units at the election of the holder thereof or the Company, subject to the terms of such Preferred Units.

Net income (loss) allocated to the preferred unitholders and common unitholders reflects their pro-rata share of net income (loss) and distributions.

Limited Partner Units

As of June 30, 2016, limited partners other than SL Green owned 4.30%, or 4,504,212 common units, of the Operating Partnership.

Preferred Units

Preferred units not owned by SL Green are further described in Note 11, “Noncontrolling Interests on the Company’s Consolidated Financial Statements - Preferred Units of Limited Partnership Interest in the Operating Partnership.”

Earnings per Unit

The Operating Partnership's earnings per unit for the three and six months ended June 30, 2016 and 2015, respectively are computed as follows (in thousands):



	Three Months Ended June 30,					Six Months Ended June 30,
Numerator	2016		2015			2016		2015
Basic and Diluted Earnings:
Net income (loss) attributable to SLGOP common unitholders	$	139,043	$	(40,683	)	$	163,186	$	4,337



	Three Months Ended June 30,		Six Months Ended June 30,
Denominator	2016	2015	2016	2015
Basic units:
Weighted average common units outstanding	104,476	103,487	104,251	102,930
Effect of Dilutive Securities:
Stock-based compensation plans	316	—	282	493
Diluted weighted average common units outstanding	104,792	103,487	104,533	103,423

The Operating Partnership has excluded 739,636, 228,122, 845,026 and 748,000 common unit equivalents from the diluted units outstanding for the three and six months ended June 30, 2016 and 2015, respectively, as they were anti-dilutive. Additionally, SLGOP has excluded 459,216 from the diluted shares outstanding for three months ended June 30, 2015 as they were anti-dilutive as a result of the net loss attributable to SLGOP common unitholders.

- Definition

+ References

+ Details

Share-based Compensation

6 Months Ended

Jun. 30, 2016

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Share-based Compensation

We have stock-based employee and director compensation plans. Our employees are compensated through the Operating Partnership. Under each plan, whenever the Company issues common or preferred stock, the Operating Partnership issues an equivalent number of units of limited partnership interest of a corresponding class to the Company.

Fourth Amended and Restated 2005 Stock Option and Incentive Plan

The Fourth Amended and Restated 2005 Stock Option and Incentive Plan, or the 2005 Plan, was approved by the Company's board of directors in April 2016 and its stockholders in June 2016 at the Company's annual meeting of stockholders. The 2005 Plan authorizes the issuance of stock options, stock appreciation rights, unrestricted and restricted stock, phantom shares, dividend equivalent rights, cash-based awards and other equity-based awards. Subject to adjustments upon certain corporate transactions or events, awards with respect to up to a maximum of 27,030,000 fungible units may be granted under the 2005 Plan. Currently, different types of awards count against the limit on the number of fungible units differently, with (1) full-value awards (i.e., those that deliver the full value of the award upon vesting, such as restricted stock) granted after the effective date of the Fourth Amendment 2005 Plan counting as 3.74 Fungible Units per share subject to such awards, (2) stock options, stock appreciation rights and other awards that do not deliver full value and expire five years from the date of grant counting as 0.73 fungible units per share subject to such awards, and (3) all other awards (e.g., ten-year stock options) counting as 1.0 fungible units per share subject to such awards. Awards granted under the 2005 Plan prior to the approval of the fourth amendment and restatement in June 2016 continue to count against the fungible unit limit based on the ratios that were in effect at the time such awards were granted, which may be different than the current ratios. As a result, depending on the types of awards issued, the 2005 Plan may result in the issuance of more or less than 27,030,000 shares. If a stock option or other award granted under the 2005 Plan expires or terminates, the common stock subject to any portion of the award that expires or terminates without having been exercised or paid, as the case may be, will again become available for the issuance of additional awards. Shares of SL Green's common stock distributed under the 2005 Plan may be treasury shares or authorized but unissued shares. Currently, unless the 2005 Plan has been previously terminated by the Company's board of directors, new awards may be granted under the 2005 Plan until June 2, 2026, which is the tenth anniversary of the date that the 2005 Plan was most recently approved by the Company's stockholders. As of June 30, 2016, 10.3 million fungible units were available for issuance under the 2005 Plan after reserving for shares underlying outstanding restricted stock units, phantom stock units granted pursuant to our Non-Employee Directors' Deferral Program and LTIP Units, including, among others, outstanding LTIP Units issued under our 2011 Long-Term Outperformance Plan.

Options are granted under the plan at the fair market value on the date of grant and, subject to employment, generally expire five or ten years from the date of grant, are not transferable other than on death, and generally vest in one to five years commencing one year from the date of grant.

The fair value of each stock option granted is estimated on the date of grant using the Black-Scholes option pricing model based on historical information with the following weighted average assumptions for grants during the six months ended June 30, 2016 and the year ended December 31, 2015.



	June 30, 2016		December 31, 2015
Dividend yield	2.30	%	1.97	%
Expected life of option	4.2 years		3.6 years
Risk-free interest rate	1.08	%	1.43	%
Expected stock price volatility	29.08	%	32.34	%

A summary of the status of the Company's stock options as of June 30, 2016 and December 31, 2015, and changes during the six months ended June 30, 2016 and year ended December 31, 2015 are as follows:



	June 30, 2016					December 31, 2015
	Options Outstanding			Weighted Average Exercise Price		Options Outstanding			Weighted Average Exercise Price
Balance at beginning of period	$	1,595,007		$	95.52	$	1,462,726		$	87.98
Granted	109,500			99.65		389,836			112.54
Exercised	(75,201		)	75.42		(217,438		)	74.69
Lapsed or cancelled	(39,200		)	113.38		(40,117		)	98.61
Balance at end of period	$	1,590,106		$	96.32	$	1,595,007		$	95.52
Options exercisable at end of period	865,289			$	89.14	589,055			$	89.85
Weighted average fair value of options granted during the period	$	2,258,336				$	9,522,613

All options were granted with strike prices ranging from $20.67 to $137.18. The remaining weighted average contractual life of the options outstanding was 3.6 years and the remaining average contractual life of the options exercisable was 2.9 years.

During the three and six months ended June 30, 2016 and 2015, respectively, we recognized $1.9 million, $3.9 million, $1.9 million, and $3.9 million of compensation expense, respectively, for these options. As of June 30, 2016, there was $12.3 million of total unrecognized compensation cost related to unvested stock options, which is expected to be recognized over a weighted average period of 1.6 years.

Stock-based Compensation

Effective January 1, 1999, the Company implemented a deferred compensation plan, or the Deferred Plan, where shares issued under the Deferred Plan were granted to certain employees, including our executives and vesting will occur annually upon the completion of a service period or our meeting established financial performance criteria. Annual vesting occurs at rates ranging from 15% to 35% once performance criteria are reached.

A summary of the Company's restricted stock as of June 30, 2016 and December 31, 2015 and charges during the six months ended June 30, 2016 and the year ended December 31, 2015, are as follows:



	June 30, 2016			December 31, 2015
Balance at beginning of period	3,137,881			3,000,979
Granted	7,500			143,053
Cancelled	(34,600		)	(6,151		)
Balance at end of period	3,110,781			3,137,881
Vested during the period	81,322			87,081
Compensation expense recorded	$	3,372,434		$	7,540,747
Weighted average fair value of restricted stock granted during the period	$	781,330		$	16,061,201

The fair value of restricted stock that vested during the six months ended June 30, 2016 and the year ended December 31, 2015 was $7.3 million and $7.4 million, respectively. As of June 30, 2016 there was $14.7 million of total unrecognized compensation cost related to restricted stock, which is expected to be recognized over a weighted average period of 2.5 years.

For the three and six months months ended June 30, 2016 and 2015, $1.4 million, $2.9 million, $1.8 million, and $3.4 million, respectively, was capitalized to assets associated with compensation expense related to our long-term compensation plans, restricted stock and stock options.

We have granted LTIP Units, which include bonus, time-based and performance based awards, with a fair value of $28.1 million and $25.4 million as of June 30, 2016 and December 31, 2015, respectively. The grant date fair value of the LTIP Unit awards was calculated in accordance with ASC 718. A third party consultant determined the fair value of the LTIP Units to have a discount from SL Green's common stock price. The discount was calculated by considering the inherent uncertainty that the LTIP Units will reach parity with other common partnership units and the illiquidity due to transfer restrictions. As of June 30, 2016, there was $10.5 million of total unrecognized compensation expense related to the time-based and performance based awards, which is expected to be recognized over a weighted average period of 1.3 years. During the three and six months ended June 30, 2016 and 2015, we recorded compensation expense related to bonus, time-based and performance based awards of $3.3 million, $12.8 million, $3.1 million, and $16.3 million, respectively.

2010 Notional Unit Long-Term Compensation Plan

In December 2009, the compensation committee of the Company's board of directors approved the general terms of the SL Green Realty Corp. 2010 Notional Unit Long-Term Compensation Program, or the 2010 Long-Term Compensation Plan. The 2010 Long-Term Compensation Plan is a long-term incentive compensation plan pursuant to which award recipients could earn, in the aggregate, from $15.0 million up to $75.0 million of LTIP Units in the Operating Partnership based on the Company's stock price appreciation over three years beginning on December 1, 2009; provided that, if maximum performance had been achieved, $25.0 million of awards could be earned at any time after the beginning of the second year and an additional $25.0 million of awards could be earned at any time after the beginning of the third year. In order to achieve maximum performance under the 2010 Long-Term Compensation Plan, the Company's aggregate stock price appreciation during the performance period had to equal or exceed 50%. The compensation committee determined that maximum performance had been achieved at or shortly after the beginning of each of the second and third years of the performance period and for the full performance period and, accordingly, 385,583 LTIP Units, 327,416 LTIP Units and 327,416 LTIP Units were earned under the 2010 Long-Term Compensation Plan in December 2010, 2011 and 2012, respectively. Substantially in accordance with the original terms of the program, 50% of these LTIP Units vested on December 17, 2012 (accelerated from the original January 1, 2013 vesting date), 25% of these LTIP Units vested on December 11, 2013 (accelerated from the original January 1, 2014 vesting date) and the remainder vested on January 1, 2015 based on continued employment. In accordance with the terms of the 2010 Long-Term Compensation Plan, distributions were not paid on any LTIP Units until they were earned, at which time we paid all distributions that would have been paid on the earned LTIP Units since the beginning of the performance period.

The cost of the 2010 Long-Term Compensation Plan ($31.7 million, subject to forfeitures) was amortized into earnings through the final vesting period of January 1, 2015.

2011 Outperformance Plan

In August 2011, the compensation committee of the Company's board of directors approved the general terms of the SL Green Realty Corp. 2011 Outperformance Plan, or the 2011 Outperformance Plan. Participants in the 2011 Outperformance Plan could earn, in the aggregate, up to $85.0 million of LTIP Units in the Operating Partnership based on our total return to stockholders for the three-year period beginning September 1, 2011. Under the 2011 Outperformance Plan, participants were entitled to share in a "performance pool" comprised of LTIP Units with a value equal to 10% of the amount by which our total return to stockholders during the three-year period exceeded a cumulative total return to stockholders of 25%, subject to the maximum of $85.0 million of LTIP Units; provided that if maximum performance was achieved, one-third of each award could be earned at any time after the beginning of the second year and an additional one-third of each award could be earned at any time after the beginning of the third year. LTIP Units earned under the 2011 Outperformance Plan were subject to vesting requirements, with 50% of any awards earned vested on August 31, 2014 and the remaining 50% vesting on August 31, 2015, based on continued employment with us through such dates. Participants were not entitled to distributions with respect to LTIP Units granted under the 2011 Outperformance Plan unless and until they were earned. For LTIP Units that were earned, each participant was also entitled to the distributions that would have been paid had the number of earned LTIP Units been issued at the beginning of the performance period, with such distributions being paid in the form of additional LTIP Units. Thereafter, distributions are to be paid currently with respect to all earned LTIP Units, whether vested or unvested. In June 2014, the compensation committee determined that maximum performance had been achieved during the third year of the performance period and, accordingly, 560,908 LTIP Units, representing two-thirds of each award, were earned, subject to vesting, under the 2011 Outperformance Plan. In September 2014, the compensation committee determined that maximum performance had been achieved for the full three-year performance period and, accordingly, 280,454 LTIP units, representing the final third of each award, were earned, subject to vesting, under the 2011 Outperformance Plan.

The cost of the 2011 Outperformance Plan ($26.7 million, subject to forfeitures) was amortized into earnings through the final vesting period. We recorded no compensation expense during the three and six months ended June 30, 2016, and $3.2 million, and $3.9 million during the three and six months ended June 30, 2015 related to the 2011 Outperformance Plan.

2014 Outperformance Plan

In August 2014, the compensation committee of the Company's board of directors approved the general terms of the SL Green Realty Corp. 2014 Outperformance Plan, or the 2014 Outperformance Plan. Participants in the 2014 Outperformance Plan may earn, in the aggregate, up to 610,000 LTIP Units in our Operating Partnership based on our total return to stockholders for the three-year period beginning September 1, 2014. For each individual award, two-thirds of the LTIP Units may be earned based on the Company’s absolute total return to stockholders and one-third of the LTIP Units may be earned based on relative total return to stockholders compared to the constituents of the MSCI REIT Index. Awards earned based on absolute total return to stockholders will be determined independently of awards earned based on relative total return to stockholders. In the event the Company’s performance reaches either threshold before the end of the three-year performance period, a pro-rata portion of the maximum award may be earned. For each component, if the Company’s performance reaches the maximum threshold beginning with the 19th month of the performance period, participants will earn one-third of the maximum award that may be earned for that component. If the Company’s performance reaches the maximum threshold during the third year of the performance period for a component, participants will earn two-thirds (or an additional one-third) of the maximum award that may be earned for that component. LTIP Units earned under the 2014 Outperformance Plan will be subject to continued vesting requirements, with 50% of any awards earned vesting on August 31, 2017 and the remaining 50% vesting on August 31, 2018, subject to continued employment with us through such dates. Participants will not be entitled to distributions with respect to LTIP Units granted under the 2014 Outperformance Plan unless and until they are earned. If LTIP Units are earned, each participant will also be entitled to the distributions that would have been paid had the number of earned LTIP Units been issued at the beginning of the performance period, with such distributions being paid in the form of cash or additional LTIP Units. Thereafter, distributions will be paid currently with respect to all earned LTIP Units, whether vested or unvested.

The cost of the 2014 Outperformance Plan ($27.9 million, subject to forfeitures), based on the portion of the 2014 Outperformance Plan granted as of June 30, 2016, will be amortized into earnings through the final vesting period. We recorded compensation expense of $3.3 million, $4.8 million, $1.5 million, and $2.9 million during the three and six months ended June 30, 2016 and 2015, respectively, related to the 2014 Outperformance Plan.

Deferred Compensation Plan for Directors

Under our Non-Employee Director's Deferral Program, which commenced July 2004, the Company's non-employee directors may elect to defer up to 100% of their annual retainer fee, chairman fees, meeting fees and annual stock grant. Unless otherwise elected by a participant, fees deferred under the program shall be credited in the form of phantom stock units. The program provides that a director's phantom stock units generally will be settled in an equal number of shares of common stock upon the earlier of (i) the January 1 coincident with or the next following such director's termination of service from the Board of Directors or (ii) a change in control by us, as defined by the program. Phantom stock units are credited to each non-employee director quarterly using the closing price of SL Green's common stock on the first business day of the respective quarter. Each participating non-employee director is also credited with dividend equivalents or phantom stock units based on the dividend rate for each quarter, which are either paid in cash currently or credited to the director’s account as additional phantom stock units.

During the six months ended June 30, 2016, 7,276 phantom stock units were earned and 8,749 shares of common stock were issued to our board of directors. We recorded compensation expense of $0.2 million, $1.8 million, $0.3 million, and $1.7 million during the three and six months ending June 30, 2016 and 2015 related to the Deferred Compensation Plan. As of June 30, 2016, there were 87,968 phantom stock units outstanding pursuant to our Non-Employee Director's Deferral Program.

Employee Stock Purchase Plan

In 2007, the Company's board of directors adopted the 2008 Employee Stock Purchase Plan, or ESPP, to encourage our employees to increase their efforts to make our business more successful by providing equity-based incentives to eligible employees. The ESPP is intended to qualify as an "employee stock purchase plan" under Section 423 of the Code, and has been adopted by the board to enable our eligible employees to purchase the Company's shares of common stock through payroll deductions. The ESPP became effective on January 1, 2008 with a maximum of 500,000 shares of the common stock available for issuance, subject to adjustment upon a merger, reorganization, stock split or other similar corporate change. The Company filed a registration statement on Form S-8 with the SEC with respect to the ESPP. The common stock is offered for purchase through a series of successive offering periods. Each offering period will be three months in duration and will begin on the first day of each calendar quarter, with the first offering period having commenced on January 1, 2008. The ESPP provides for eligible employees to purchase the common stock at a purchase price equal to 85% of the lesser of (1) the market value of the common stock on the first day of the offering period or (2) the market value of the common stock on the last day of the offering period. The ESPP was approved by our stockholders at our 2008 annual meeting of stockholders. As of June 30, 2016, 91,273 shares of SL Green's common stock had been issued under the ESPP.

- Definition

The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details.

+ References + Details

Accumulated Other Comprehensive Loss

6 Months Ended

Jun. 30, 2016

Accumulated Other Comprehensive Income (Loss) [Line Items]

Accumulated Other Comprehensive Loss of the Company/Operating Partnership

Stockholders’ Equity of the Company

Common Stock

At-The-Market Equity Offering Program

Perpetual Preferred Stock

Dividend Reinvestment and Stock Purchase Plan

Earnings per Share

SL Green's earnings per share for the three and six months ended June 30, 2016 and 2015 are computed as follows (in thousands):



	Three Months Ended June 30,					Six Months Ended June 30,
Numerator	2016		2015			2016		2015
Basic Earnings:
Income (loss) attributable to SL Green common stockholders	$	133,457	$	(39,106	)	$	156,678	$	4,171
Effect of Dilutive Securities:
Redemption of units to common shares	5,586		—			6,508		166
Diluted Earnings:
Income (loss) attributable to SL Green common stockholders	$	139,043	$	(39,106	)	$	163,186	$	4,337



	Three Months Ended June 30,		Six Months Ended June 30,
Denominator	2016	2015	2016	2015
Basic Shares:
Weighted average common stock outstanding	100,134	99,579	100,093	98,994
Effect of Dilutive Securities:
Operating Partnership units redeemable for common shares	4,342	—	4,158	3,936
Stock-based compensation plans	316	—	282	493
Diluted weighted average common stock outstanding	104,792	99,579	104,533	103,423

SL Green Realty Corp

Accumulated Other Comprehensive Income (Loss) [Line Items]

Accumulated Other Comprehensive Loss of the Company/Operating Partnership

Accumulated Other Comprehensive Loss

The following tables set forth the changes in accumulated other comprehensive income (loss) by component as of June 30, 2016 (in thousands):



	Net unrealized (loss) gain on derivative instruments⁽¹⁾			SL Green’s share of joint venture net unrealized (loss) gain on derivative instruments⁽²⁾			Unrealized gain (loss) on marketable securities			Total
Balance at December 31, 2015	$	(10,160	)	$	(592	)	$	2,003		$	(8,749	)
Other comprehensive loss before reclassifications	(7,547		)	(6,658		)	(841		)	(15,046		)
Amounts reclassified from accumulated other comprehensive income	6,175			1,062			—			7,237
Balance at June 30, 2016	$	(11,532	)	$	(6,188	)	$	1,162		$	(16,558	)

(1)

Amount reclassified from accumulated other comprehensive income (loss) is included in interest expense in the respective consolidated statements of operations. As of June 30, 2016 and December 31, 2015, the deferred net losses from these terminated hedges, which is included in accumulated other comprehensive loss relating to net unrealized loss on derivative instrument, was $8.4 million and $9.7 million, respectively.


(2)	Amount reclassified from accumulated other comprehensive income (loss) is included in equity in net income from unconsolidated joint ventures in the respective consolidated statements of operations.

- Definition

+ References

+ Details

Fair Value Measurements

6 Months Ended

Jun. 30, 2016

Fair Value Disclosures [Abstract]

Fair Value Measurements

We are required to disclose fair value information with regard to our financial instruments, whether or not recognized in the consolidated balance sheets, for which it is practical to estimate fair value. The FASB guidance defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants on the measurement date. We measure and/or disclose the estimated fair value of financial assets and liabilities based on a hierarchy that distinguishes between market participant assumptions based on market data obtained from sources independent of the reporting entity and the reporting entity’s own assumptions about market participant assumptions. This hierarchy consists of three broad levels: Level 1 - quoted prices (unadjusted) in active markets for identical assets or liabilities that the reporting entity can access at the measurement date; Level 2 - inputs other than quoted prices included within Level 1, that are observable for the asset or liability, either directly or indirectly; and Level 3 - unobservable inputs for the asset or liability that are used when little or no market data is available. We follow this hierarchy for our assets and liabilities measured at fair value on a recurring and nonrecurring basis. In instances in which the determination of the fair value measurement is based on inputs from different levels of the fair value hierarchy, the level in the fair value hierarchy within which the entire fair value measurement falls is based on the lowest level of input that is significant to the fair value measurement in its entirety. Our assessment of the significance of the particular input to the fair value measurement in its entirety requires judgment and considers factors specific to the asset or liability.

The following tables set forth the assets and liabilities that we measure at fair value on a recurring and non-recurring basis by their levels in the fair value hierarchy at June 30, 2016 and December 31, 2015 (in thousands):



	June 30, 2016
	Total		Level 1		Level 2		Level 3
Assets:
Marketable securities	$	39,339	$	334	$	39,005	$	—
Interest rate cap and swap agreements (included in other assets)	$	—	$	—	$	—	$	—
Liabilities:
Interest rate cap and swap agreements (included in accrued interest payable and other liabilities)	$	3,036	$	—	$	3,036	$	—
Interest rate cap and swap agreements (included in liabilities related to assets held for sale)	$	—	$	—	$	—	$	—



	December 31, 2015
	Total		Level 1		Level 2		Level 3
Assets:
Marketable securities	$	45,138	$	4,704	$	40,434	$	—
Interest rate cap and swap agreements (included in other assets)	$	204	$	—	$	204	$	—
Liabilities:
Interest rate cap and swap agreements (included in accrued interest payable and other liabilities)	$	10,776	$	—	$	10,776	$	—

We determine other than temporary impairment in real estate investments and debt and preferred equity investments, including intangibles, utilizing cash flow projections that apply, among other things, estimated revenue and expense growth rates, discount rates and capitalization rates, which are classified as Level 3 inputs.

The marketable securities classified as Level 1 were derived from quoted prices in active markets. The valuation technique used to measure the fair value of the marketable securities classified as Level 2 were valued based on quoted market prices or model driven valuations using the significant inputs derived from or corroborated by observable market data. Marketable securities in an unrealized loss position are not considered to be other than temporarily impaired. We do not intend to sell these securities and it is not more likely than not that we will be required to sell the investments before recovery of their amortized cost bases.

The fair value of derivative instruments is based on current market data received from financial sources that trade such instruments and are based on prevailing market data and derived from third party proprietary models based on well-recognized financial principles and reasonable estimates about relevant future market conditions, which are classified as Level 2 inputs.

The financial assets and liabilities that are not measured at fair value on our consolidated balance sheets include cash and cash equivalents, restricted cash, accounts receivable, accounts payable and accrued expenses, debt and preferred equity investments, mortgages and other loans payable and other secured and unsecured debt. The carrying amount of cash and cash equivalents, restricted cash, accounts receivable, and accounts payable and accrued expenses reported in our consolidated balance sheets approximates fair value due to the short term nature of these instruments. The fair value of debt and preferred equity investments, which is classified as Level 3, is estimated by discounting the future cash flows using current interest rates at which similar loans with the same maturities would be made to borrowers with similar credit ratings. The fair value of borrowings, which is classified as Level 3, is estimated by discounting the contractual cash flows of each debt to their present value using adjusted market interest rates, which is provided by a third-party specialist.

The following table provides the carrying value and fair value of these financial instruments as of June 30, 2016 and December 31, 2015 (in thousands):



	June 30, 2016				December 31, 2015
	Carrying Value		Fair Value		Carrying Value		Fair Value

Debt and preferred equity investments	$	1,357,181	⁽¹⁾		$	1,670,020	⁽¹⁾

Fixed rate debt	$	6,612,587	$	7,058,553	$	7,232,254	$	7,591,388
Variable rate debt	1,451,155		1,445,621		3,202,494		3,179,186
	$	8,063,742	$	8,504,174	$	10,434,748	$	10,770,574


(1)	At June 30, 2016, debt and preferred equity investments had an estimated fair value ranging between $1.4 billion and $1.5 billion. At December 31, 2015, debt and preferred equity investments had an estimated fair value ranging between $1.7 billion and $1.8 billion.

Disclosure about fair value of financial instruments was based on pertinent information available to us as of June 30, 2016 and December 31, 2015. Although we are not aware of any factors that would significantly affect the reasonable fair value amounts, such amounts have not been comprehensively revalued for purposes of these financial statements since that date and current estimates of fair value may differ significantly from the amounts presented herein.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Financial Instruments: Derivatives and Hedging

6 Months Ended

Jun. 30, 2016

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Financial Instruments: Derivatives and Hedging

In the normal course of business, we use a variety of commonly used derivative instruments, such as interest rate swaps, caps, collar and floors, to manage, or hedge interest rate risk. We hedge our exposure to variability in future cash flows for forecasted transactions in addition to anticipated future interest payments on existing debt. We recognize all derivatives on the balance sheets at fair value. Derivatives that are not hedges are adjusted to fair value through earnings. If a derivative is a hedge, depending on the nature of the hedge, changes in the fair value of the derivative will either be offset against the change in fair value of the hedge asset, liability, or firm commitment through earnings, or recognized in other comprehensive income until the hedged item is recognized in earnings. The ineffective portion of a derivative's change in fair value will be immediately recognized in earnings. Reported net income and equity may increase or decrease prospectively, depending on future levels of interest rates and other variables affecting the fair values of derivative instruments and hedged items, but will have no effect on cash flows. Currently, all of our designated derivative instruments are effective hedging instruments.

The following table summarizes the notional value at inception and fair value of our consolidated derivative financial instruments at June 30, 2016 based on Level 2 information. The notional value is an indication of the extent of our involvement in these instruments at that time, but does not represent exposure to credit, interest rate or market risks (amounts in thousands).



	Notional Value		Strike Rate		Effective Date	Expiration Date	Balance Sheet Location	Fair Value
Interest Rate Swap	$	200,000	0.938	%	October 2014	December 2017	Other Liabilities	$	(1,202	)
Interest Rate Swap	150,000		0.940	%	October 2014	December 2017	Other Liabilities	(906		)
Interest Rate Swap	150,000		0.940	%	October 2014	December 2017	Other Liabilities	(906		)
Interest Rate Cap	117,392		6.000	%	October 2014	October 2016	Other Liabilities	—
Interest Rate Swap	14,409		0.500	%	January 2015	January 2017	Other Liabilities	(4		)
Interest Rate Swap	8,018		0.852	%	February 2015	February 2017	Other Liabilities	(18		)
Interest Rate Cap	137,500		4.000	%	September 2015	September 2017	Other Assets	—
Interest Rate Cap	1,450,000		4.750	%	May 2016	May 2017	Other Assets	—
							Total	$	(3,036	)

During both the three and six months ended June 30, 2016, we recorded a gain on the changes in the fair value of $0.5 million, which is included in interest expense on the consolidated statements of operations. During both the three and six months ended June 30, 2015, we recorded a gain on the changes in the fair value of $0.1 million, which is included in interest expense on the consolidated statements of operations.

The Company has agreements with each of its derivative counterparties that contain a provision where if the Company either defaults or is capable of being declared in default on any of its indebtedness, then the Company could also be declared in default on its derivative obligations. As of June 30, 2016, the fair value of derivatives in a net liability position including accrued interest but excluding any adjustment for nonperformance risk related to these agreements was $3.1 million. As of June 30, 2016, the Company has not posted any collateral related to these agreements and was not in breach of any agreement provisions. If the Company had breached any of these provisions, it could have been required to settle its obligations under the agreements at their aggregate termination value of $3.2 million at June 30, 2016.

Gains and losses on terminated hedges are included in accumulated other comprehensive loss, and are recognized into earnings over the term of the related mortgage obligation. Over time, the realized and unrealized gains and losses held in accumulated other comprehensive loss will be reclassified into earnings as an adjustment to interest expense in the same periods in which the hedged interest payments affect earnings. We estimate that $4.5 million of the current balance held in accumulated other comprehensive loss will be reclassified into interest expense and $1.8 million of the portion related to our share of joint venture accumulated other comprehensive loss will be reclassified into equity in net income from unconsolidated joint ventures within the next 12 months.

The following table presents the effect of our derivative financial instruments and our share of our joint ventures' derivative financial instruments that are designated and qualify as hedging instruments on the consolidated statements of operations for the three months ended June 30, 2016 and 2015, respectively (in thousands):



	Amount of (Loss) Gain Recognized in Other Comprehensive Loss (Effective Portion)						Location of (Loss) Reclassified from Accumulated Other Comprehensive Loss into Income	Amount of Loss Reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion)				Location of (Loss) or Gain Recognized in Income on Derivative	Amount of (Loss) or Gain Recognized into Income (Ineffective Portion)
	Three Months Ended June 30,							Three Months Ended June 30,					Three Months Ended June 30,
Derivative	2016			2015				2016		2015			2016			2015
Interest Rate Swaps/Caps	$	(1,186	)	$	(1,095	)	Interest expense	$	4,468	$	2,737	Interest expense	$	1		$	(14	)
Share of unconsolidated joint ventures' derivative instruments	(3,005		)	277			Equity in net income from unconsolidated joint ventures	567		331		Equity in net income from unconsolidated joint ventures	(600		)	16
	$	(4,191	)	$	(818	)		$	5,035	$	3,068		$	(599	)	$	2

The following table presents the effect of our derivative financial instruments and our share of our joint ventures' derivative financial instruments that are designated and qualify as hedging instruments on the consolidated statements of operations for the six months ended June 30, 2016 and 2015, respectively (in thousands):



	Amount of (Loss) Gain Recognized in Other Comprehensive Loss (Effective Portion)						Location of (Loss) Reclassified from Accumulated Other Comprehensive Loss into Income	Amount of Loss Reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion)				Location of (Loss) or Gain Recognized in Income on Derivative	Amount of (Loss) or Gain Recognized into Income (Ineffective Portion)
	Six Months Ended June 30,							Six Months Ended June 30,					Six Months Ended June 30,
Derivative	2016			2015				2016		2015			2016			2015
Interest Rate Swaps/Caps	$	(8,105	)	$	(8,616	)	Interest expense	$	6,631	$	5,484	Interest expense	$	(38	)	$	(424	)
Share of unconsolidated joint ventures' derivative instruments	(5,770		)	(960		)	Equity in net income from unconsolidated joint ventures	918		662		Equity in net income from unconsolidated joint ventures	(1,036		)	—
	$	(13,875	)	$	(9,576	)		$	7,549	$	6,146		$	(1,074	)	$	(424	)

- Definition

The entire disclosure for derivative instruments and hedging activities including, but not limited to, risk management strategies, non-hedging derivative instruments, assets, liabilities, revenue and expenses, and methodologies and assumptions used in determining the amounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6441202&loc=d3e80720-113993

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
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-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5579240-113959

Reference 6: http://www.xbrl.org/2003/role/presentationRef
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-SubTopic 30
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Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
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-Section 50
-Paragraph 1A
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Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
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-Paragraph 4H
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Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 30
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+ Details

Commitments and Contingencies

6 Months Ended

Jun. 30, 2016

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Legal Proceedings

As of June 30, 2016, the Company and the Operating Partnership were not involved in any material litigation nor, to management's knowledge, was any material litigation threatened against us or our portfolio which if adversely determined could have a material adverse impact on us.

Environmental Matters

The Company believes that its properties are in compliance in all material respects with applicable Federal, state and local ordinances and regulations regarding environmental issues. Management is not aware of any environmental liability that it believes would have a materially adverse impact on our financial position, results of operations or cash flows. Management is unaware of any instances in which it would incur significant environmental cost if any of our properties were sold.

Capital and Ground Leases Arrangements

The following is a schedule of future minimum lease payments under capital leases and non-cancellable operating leases with initial terms in excess of one year as of June 30, 2016 (in thousands):



	Capital lease			Non-cancellable operating leases
Remaining 2016	$	1,145		$	15,468
2017	2,387			31,049
2018	2,387			31,049
2019	2,411			31,066
2020	2,620			31,436
Thereafter	825,483			764,353
Total minimum lease payments	$	836,433		$	904,421
Amount representing interest	(794,682		)
Capital lease obligations	$	41,751

Segment Information

6 Months Ended

Jun. 30, 2016

Segment Reporting [Abstract]

Segment Information

The Company is a REIT engaged in all aspects of property ownership and management including investment, leasing, operations, capital improvements, development, redevelopment, financing, construction and maintenance in the New York Metropolitan area and have two reportable segments, real estate and debt and preferred equity. We evaluate real estate performance and allocate resources based on earnings contribution to income from continuing operations.

The primary sources of revenue are generated from tenant rents and escalations and reimbursement revenue. Real estate property operating expenses consist primarily of security, maintenance, utility costs, real estate taxes and ground rent expense (at certain applicable properties). See Note 5, "Debt and Preferred Equity Investments," for additional details on our debt and preferred equity investments.

Selected results of operations for the three and six months ended June 30, 2016 and 2015, and selected asset information as of June 30, 2016 and December 31, 2015, regarding our operating segments are as follows (in thousands):



	Real Estate Segment			Debt and Preferred Equity Segment		Total Company
Total revenues
Three months ended:
June 30, 2016	$	569,824		$	47,790	$	617,614
June 30, 2015	361,730			47,344		409,074
Six months ended:
June 30, 2016	968,180			104,878		1,073,058
June 30, 2015	713,832			91,541		805,373
(Loss) Income from continuing operations before equity in net gain on sale of interest in unconsolidated joint venture/real estate, gain on sale of real estate, depreciable real estate reserves net of recoveries, and loss on sale of investment in marketable securities
Three months ended:
June 30, 2016	$	(112,337	)	$	41,874	$	(70,463	)
June 30, 2015	(67,807		)	37,859		(29,948		)
Six months ended:
June 30, 2016	(153,270		)	91,622		(61,648		)
June 30, 2015	(63,170		)	75,448		12,278
Total assets
As of:
June 30, 2016	$	15,865,286		$	1,678,937	$	17,544,223
December 31, 2015	18,045,370			1,682,276		19,727,646

Income from continuing operations represents total revenues less total expenses for the real estate segment and total investment income less allocated interest expense for the debt and preferred equity segment. Interest costs for the debt and preferred equity segment includes actual costs incurred for investments collateralizing the MRA. Interest is imputed on the remaining investments using our corporate borrowing cost. We also allocate loan loss reserves, net of recoveries, and transaction related costs to the debt and preferred equity segment. We do not allocate marketing, general and administrative expenses (totaling $24.5 million $48.5 million, $23.2 million and $48.7 million for the three and six months ended June 30, 2016 and 2015, respectively) to the debt and preferred equity segment since we base performance on the individual segments prior to allocating marketing, general and administrative expenses. All other expenses, except interest, relate entirely to the real estate assets.

There were no transactions between the above two segments.

The table below reconciles income from continuing operations to net income for the three months and six months ended June 30, 2016, and 2015 (in thousands):



	Three Months Ended June 30,						Six Months Ended June 30,
	2016			2015			2016			2015
(Loss) Income from continuing operations before equity in net gain on sale of interest in unconsolidated joint venture/real estate, gain on sale of real estate, depreciable real estate reserves net of recoveries, and loss on sale of investment in marketable securities	$	(70,463	)	$	(29,948	)	$	(61,648	)	$	12,278
Equity in net gain on sale of interest in unconsolidated joint venture/real estate	33,448			769			43,363			769
Gain on sale of real estate, net	196,580			—			210,353			—
Depreciable real estate reserves	(10,387		)	—			(10,387		)	—
Loss on sale of investment in marketable securities	(83		)	—			(83		)	—
Income (loss) from continuing operations	149,095			(29,179		)	181,598			13,047
Net income (loss) from discontinued operations	—			—			—			427
Gain on sale of discontinued operations	—			—			—			12,983
Net income (loss)	$	149,095		$	(29,179	)	$	181,598		$	26,457

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

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+ Details

Significant Accounting Policies (Policies)	6 Months Ended
Significant Accounting Policies (Policies)	Jun. 30, 2016
Accounting Policies [Abstract]
Principles of Consolidation	Principles of Consolidation The consolidated financial statements include our accounts and those of our subsidiaries, which are wholly-owned or controlled by us. Entities which we do not control through our voting interest and entities which are variable interest entities, but where we are not the primary beneficiary, are accounted for under the equity method. See Note 5, "Debt and Preferred Equity Investments" and Note 6, "Investments in Unconsolidated Joint Ventures." All significant intercompany balances and transactions have been eliminated. We consolidate a variable interest entity, or VIE, in which we are considered the primary beneficiary. The primary beneficiary is the entity that has (i) the power to direct the activities that most significantly impact the entity's economic performance and (ii) the obligation to absorb losses of the VIE or the right to receive benefits from the VIE that could be significant to the VIE. Included in commercial real estate properties on our consolidated balance sheets as of June 30, 2016 and December 31, 2015 are $1.5 billion and $200.7 million, respectively, related to our consolidated VIEs. Included in mortgages and other loans payable on our consolidated balance sheets as of June 30, 2016 and December 31, 2015 are $594.6 million and $101.1 million, respectively, collateralized by the real estate assets of the related consolidated VIEs. As of June 30, 2016, assets held for sale and liabilities related to assets held for sale on the consolidated balance sheets did not include amounts related to consolidated VIEs. A noncontrolling interest in a consolidated subsidiary is defined as the portion of the equity (net assets) in a subsidiary not attributable, directly or indirectly, to us. Noncontrolling interests are required to be presented as a separate component of equity in the consolidated balance sheet and the presentation of net income is modified to present earnings and other comprehensive income attributed to controlling and noncontrolling interests. We assess the accounting treatment for each joint venture and debt and preferred equity investment. This assessment includes a review of each joint venture or limited liability company agreement to determine which party has what rights and whether those rights are protective or participating. For all VIEs, we review such agreements in order to determine which party has the power to direct the activities that most significantly impact the entity's economic performance. In situations where we and our partner approve, among other things, the annual budget, receive a detailed monthly reporting package, meet on a quarterly basis to review the results of the joint venture, review and approve the joint venture's tax return before filing, and approve all leases that cover more than a nominal amount of space relative to the total rentable space at each property, we do not consolidate the joint venture as we consider these to be substantive participation rights that result in shared power of the activities that most significantly impact the performance of the joint venture. Our joint venture agreements typically contain certain protective rights such as requiring partner approval to sell, finance or refinance the property and the payment of capital expenditures and operating expenditures outside of the approved budget or operating plan.
Investment in Commercial Real Estate Properties	Investment in Commercial Real Estate Properties On a periodic basis, we assess whether there are any indications that the value of our real estate properties may be other than temporarily impaired or that their carrying value may not be recoverable. A property's value is considered impaired if management's estimate of the aggregate future cash flows (undiscounted) to be generated by the property is less than the carrying value of the property. To the extent impairment has occurred, the loss will be measured as the excess of the carrying amount of the property over the calculated fair value of the property. We also evaluate our real estate properties for potential impairment when a real estate property has been classified as held for sale. Real estate assets held for sale are valued at the lower of either their carrying value or fair value less costs to sell. We do not believe that there were any indicators of impairment at any of our consolidated properties at June 30, 2016, except for 500 West Putnam Avenue in Greenwich, Connecticut for which we recorded a $10.4 million depreciable real estate reserve during the three months ended June 30, 2016. We allocate the purchase price of real estate to land and building (inclusive of tenant improvements) and, if determined to be material, intangibles, such as the value of above- and below-market leases and origination costs associated with the in-place leases. We depreciate the amount allocated to building (inclusive of tenant improvements) over their estimated useful lives, which generally range from three to 40 years. We amortize the amount allocated to the above- and below-market leases over the remaining term of the associated lease, which generally range from one to 14 years, and record it as either an increase (in the case of below-market leases) or a decrease (in the case of above-market leases) to rental income. We amortize the amount allocated to the values associated with in-place leases over the expected term of the associated lease, which generally ranges from one to 14 years. If a tenant vacates its space prior to the contractual termination of the lease and no rental payments are being made on the lease, any unamortized balance of the related intangible will be written off. The tenant improvements and origination costs are amortized as an expense over the remaining life of the lease (or charged against earnings if the lease is terminated prior to its contractual expiration date). We assess fair value of the leases based on estimated cash flow projections that utilize appropriate discount and capitalization rates and available market information. Estimates of future cash flows are based on a number of factors including the historical operating results, known trends, and market/economic conditions that may affect the property. To the extent acquired leases contain fixed rate renewal options that are below-market and determined to be material, we amortize such below-market lease value into rental income over the renewal period.
Fair Value Measurements	Fair Value Measurements We are required to disclose fair value information with regard to our financial instruments, whether or not recognized in the consolidated balance sheets, for which it is practical to estimate fair value. The FASB guidance defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants on the measurement date. We measure and/or disclose the estimated fair value of financial assets and liabilities based on a hierarchy that distinguishes between market participant assumptions based on market data obtained from sources independent of the reporting entity and the reporting entity’s own assumptions about market participant assumptions. This hierarchy consists of three broad levels: Level 1 - quoted prices (unadjusted) in active markets for identical assets or liabilities that the reporting entity can access at the measurement date; Level 2 - inputs other than quoted prices included within Level 1, that are observable for the asset or liability, either directly or indirectly; and Level 3 - unobservable inputs for the asset or liability that are used when little or no market data is available. We follow this hierarchy for our assets and liabilities measured at fair value on a recurring and nonrecurring basis. In instances in which the determination of the fair value measurement is based on inputs from different levels of the fair value hierarchy, the level in the fair value hierarchy within which the entire fair value measurement falls is based on the lowest level of input that is significant to the fair value measurement in its entirety. Our assessment of the significance of the particular input to the fair value measurement in its entirety requires judgment and considers factors specific to the asset or liability. We determine other than temporary impairment in real estate investments and debt and preferred equity investments, including intangibles, utilizing cash flow projections that apply, among other things, estimated revenue and expense growth rates, discount rates and capitalization rates, which are classified as Level 3 inputs. The marketable securities classified as Level 1 were derived from quoted prices in active markets. The valuation technique used to measure the fair value of the marketable securities classified as Level 2 were valued based on quoted market prices or model driven valuations using the significant inputs derived from or corroborated by observable market data. Marketable securities in an unrealized loss position are not considered to be other than temporarily impaired. We do not intend to sell these securities and it is not more likely than not that we will be required to sell the investments before recovery of their amortized cost bases. The fair value of derivative instruments is based on current market data received from financial sources that trade such instruments and are based on prevailing market data and derived from third party proprietary models based on well-recognized financial principles and reasonable estimates about relevant future market conditions, which are classified as Level 2 inputs. The financial assets and liabilities that are not measured at fair value on our consolidated balance sheets include cash and cash equivalents, restricted cash, accounts receivable, accounts payable and accrued expenses, debt and preferred equity investments, mortgages and other loans payable and other secured and unsecured debt. The carrying amount of cash and cash equivalents, restricted cash, accounts receivable, and accounts payable and accrued expenses reported in our consolidated balance sheets approximates fair value due to the short term nature of these instruments. The fair value of debt and preferred equity investments, which is classified as Level 3, is estimated by discounting the future cash flows using current interest rates at which similar loans with the same maturities would be made to borrowers with similar credit ratings. The fair value of borrowings, which is classified as Level 3, is estimated by discounting the contractual cash flows of each debt to their present value using adjusted market interest rates, which is provided by a third-party specialist.
Investment in Marketable Securities	Investment in Marketable Securities We designate a security as held-to-maturity, available-for-sale, or trading at acquisition. As of June 30, 2016, we did not have any securities designated as held-to-maturity or trading. We account for our available-for-sale securities at fair value pursuant to Accounting Standards Codification, or ASC, 820-10, with the net unrealized gains or losses reported as a component of accumulated other comprehensive income or loss. Any unrealized losses that are determined to be other-than-temporary are recognized in earnings up to their credit component. The cost of bonds and marketable securities sold is determined using the specific identification method.
Investments in Unconsolidated Joint Ventures	Investments in Unconsolidated Joint Ventures We assess our investments in unconsolidated joint ventures for recoverability, and if it is determined that a loss in value of the investment is other than temporary, we write down the investment to its fair value. We evaluate our equity investments for impairment based on the joint ventures' projected discounted cash flows. We do not believe that the values of any of our equity investments were impaired at June 30, 2016. We may originate loans for real estate acquisition, development and construction, where we expect to receive some of the residual profit from such projects. When the risk and rewards of these arrangements are essentially the same as an investor or joint venture partner, we account for these arrangements as real estate investments under the equity method of accounting for investments. Otherwise, we account for these arrangements consistent with our loan accounting for our debt and preferred equity investments.
Revenue Recognition	Revenue Recognition Rental revenue is recognized on a straight-line basis over the term of the lease. Rental revenue recognition commences when the tenant takes possession or controls the physical use of the leased space. In order for the tenant to take possession, the leased space must be substantially ready for its intended use. To determine whether the leased space is substantially ready for its intended use, management evaluates whether we are or the tenant is the owner of tenant improvements for accounting purposes. When management concludes that we are the owner of tenant improvements, rental revenue recognition begins when the tenant takes possession of the finished space, which is when such tenant improvements are substantially complete. In certain instances, when management concludes that we are not the owner (the tenant is the owner) of tenant improvements, rental revenue recognition begins when the tenant takes possession of or controls the space. When management concludes that we are the owner of tenant improvements for accounting purposes, we record amounts funded to construct the tenant improvements as a capital asset. For these tenant improvements, we record amounts reimbursed by tenants as a reduction of the capital asset. When management concludes that the tenant is the owner of tenant improvements for accounting purposes, we record our contribution towards those improvements as a lease incentive, which is included in deferred costs, net on our consolidated balance sheets and amortized as a reduction to rental revenue on a straight-line basis over the term of the lease. The excess of rents recognized over amounts contractually due pursuant to the underlying leases are included in deferred rents receivable on the consolidated balance sheets. We establish, on a current basis, an allowance for future potential tenant credit losses, which may occur against this account. The balance reflected on the consolidated balance sheets is net of such allowance. In addition to base rent, our tenants also generally will pay their pro rata share of increases in real estate taxes and operating expenses for the building over a base year. In some leases, in lieu of paying additional rent based upon increases in building operating expenses, the tenant will pay additional rent based upon increases in the wage rate paid to porters over the porters' wage rate in effect during a base year or increases in the consumer price index over the index value in effect during a base year. In addition, many of our leases contain fixed percentage increases over the base rent to cover escalations. Electricity is most often supplied by the landlord either on a sub-metered basis, or rent inclusion basis (i.e., a fixed fee is included in the rent for electricity, which amount may increase based upon increases in electricity rates or increases in electrical usage by the tenant). Base building services other than electricity (such as heat, air conditioning and freight elevator service during business hours, and base building cleaning) are typically provided at no additional cost, with the tenant paying additional rent only for services which exceed base building services or for services which are provided outside normal business hours. These escalations are based on actual expenses incurred in the prior calendar year. If the expenses in the current year are different from those in the prior year, then during the current year, the escalations will be adjusted to reflect the actual expenses for the current year. We record a gain on sale of real estate when title is conveyed to the buyer, subject to the buyer's financial commitment being sufficient to provide economic substance to the sale and provided that we have no substantial economic involvement with the buyer. Interest income on debt and preferred equity investments is accrued based on the contractual terms of the instruments and when, in the opinion of management, it is deemed collectible. Some debt and preferred equity investments provide for accrual of interest at specified rates, which differ from current payment terms. Interest is recognized on such loans at the accrual rate subject to management's determination that accrued interest is ultimately collectible, based on the underlying collateral and operations of the borrower. If management cannot make this determination, interest income above the current pay rate is recognized only upon actual receipt. Deferred origination fees, original issue discounts and loan origination costs, if any, are recognized as an adjustment to the interest income over the terms of the related investments using the effective interest method. Fees received in connection with loan commitments are also deferred until the loan is funded and are then recognized over the term of the loan as an adjustment to yield. Discounts or premiums associated with the purchase of loans are amortized or accreted into interest income as a yield adjustment on the effective interest method based on expected cashflows through the expected maturity date of the related investment. If we purchase a debt or preferred equity investment at a discount, intend to hold it until maturity and expect to recover the full value of the investment, we accrete the discount into income as an adjustment to yield over the term of the investment. If we purchase a debt or preferred equity investment at a discount with the intention of foreclosing on the collateral, we do not accrete the discount. For debt investments acquired at a discount for credit quality, the difference between contractual cash flows and expected cash flows at acquisition is not accreted. Anticipated exit fees, the collection of which is expected, are also recognized over the term of the loan as an adjustment to yield. Debt and preferred equity investments are placed on a non-accrual status at the earlier of the date at which payments become 90 days past due or when, in the opinion of management, a full recovery of interest income becomes doubtful. Interest income recognition on any non-accrual debt or preferred equity investment is resumed when such non-accrual debt or preferred equity investment becomes contractually current and performance is demonstrated to be resumed. Interest is recorded as income on impaired loans only to the extent cash is received. We may syndicate a portion of the loans that we originate or sell the loans individually. When a transaction meets the criteria for sale accounting, we derecognize the loan sold and recognize gain or loss based on the difference between the sales price and the carrying value of the loan sold. Any related unamortized deferred origination fees, original issue discounts, loan origination costs, discounts or premiums at the time of sale are recognized as an adjustment to the gain or loss on sale, which is included in investment income on the consolidated statement of operations. Any fees received at the time of sale or syndication are recognized as part of investment income. Asset management fees are recognized on a straight-line basis over the term of the asset management agreement.
Reserve for Possible Credit Losses	Reserve for Possible Credit Losses The expense for possible credit losses in connection with debt and preferred equity investments is the charge to earnings to increase the allowance for possible credit losses to the level that we estimate to be adequate, based on Level 3 data, considering delinquencies, loss experience and collateral quality. Other factors considered include geographic trends, product diversification, the size of the portfolio and current economic conditions. Based upon these factors, we establish a provision for possible credit loss on each individual investment. When it is probable that we will be unable to collect all amounts contractually due, the investment is considered impaired. Where impairment is indicated on an investment that is held to maturity, a valuation allowance is measured based upon the excess of the recorded investment amount over the net fair value of the collateral. Any deficiency between the carrying amount of an asset and the calculated value of the collateral is charged to expense. We continue to assess or adjust our estimates based on circumstances of a loan and the underlying collateral. If additional information reflects increased recovery of our investment, we will adjust our reserves accordingly. There were no loan reserves recorded during the three and six months ended June 30, 2016 and 2015. Debt and preferred equity investments held for sale are carried at the lower of cost or fair market value using available market information obtained through consultation with dealers or other originators of such investments as well as discounted cash flow models based on Level 3 data pursuant to ASC 820-10. As circumstances change, management may conclude not to sell an investment designated as held for sale. In such situations, the investment will be reclassified at its net carrying value to debt and preferred equity investments held to maturity. For these reclassified investments, the difference between the current carrying value and the expected cash to be collected at maturity will be accreted into income over the remaining term of the investment.
Income Taxes	Income Taxes SL Green is taxed as a REIT under Section 856(c) of the Code. As a REIT, SL Green generally is not subject to Federal income tax. To maintain its qualification as a REIT, SL Green must distribute at least 90% of its REIT taxable income to its stockholders and meet certain other requirements. If SL Green fails to qualify as a REIT in any taxable year, SL Green will be subject to Federal income tax on SL Green's taxable income at regular corporate rates. SL Green may also be subject to certain state, local and franchise taxes. Under certain circumstances, Federal income and excise taxes may be due on SL Green's undistributed taxable income. The Operating Partnership is a partnership and, as a result, all income and losses of the partnership are allocated to the partners for inclusion in their respective income tax returns. The only provision for income taxes included in the consolidated statements of operations relates to the Operating Partnership’s consolidated taxable REIT subsidiaries. The Operating Partnership may also be subject to certain state, local and franchise taxes. Pursuant to amendments to the Code that became effective January 1, 2001, we have elected, and may elect in the future, to treat certain of our existing or newly created corporate subsidiaries as taxable REIT subsidiaries, or TRSs. In general, TRSs may perform non-customary services for the tenants of the Company, hold assets that we cannot hold directly and generally may engage in any real estate or non-real estate related business. The TRSs generate income, resulting in Federal and state income tax liability for these entities. During the three and six months ended June 30, 2016 and 2015, we recorded Federal, state and local tax provisions of $0.3 million, $1.5 million, $1.1 million, and $1.4 million, respectively. We follow a two-step approach for evaluating uncertain tax positions. Recognition (step one) occurs when an enterprise concludes that a tax position, based solely on its technical merits, is more-likely-than-not to be sustained upon examination. Measurement (step two) determines the amount of benefit that is more-likely-than-not to be realized upon settlement. Derecognition of a tax position that was previously recognized would occur when a company subsequently determines that a tax position no longer meets the more-likely-than-not threshold of being sustained. The use of a valuation allowance as a substitute for derecognition of tax positions is prohibited.
Stock-Based Employee Compensation Plans	Stock-Based Employee Compensation Plans We have a stock-based employee compensation plan, described more fully in Note 14, "Share-based Compensation." The Company's stock options are recorded at fair value at the time of issuance. Fair value of the stock options is determined using the Black-Scholes option pricing model. The Black-Scholes model was developed for use in estimating the fair value of traded options, which have no vesting restrictions and are fully transferable. In addition, option valuation models require the input of highly subjective assumptions including the expected stock price volatility. Because our plan has characteristics significantly different from those of traded options and because changes in the subjective input assumptions can materially affect the fair value estimate, in our opinion, the existing models do not necessarily provide a reliable single measure of the fair value of the employee stock options. Compensation cost for stock options, if any, is recognized over the vesting period of the award. Our policy is to grant options with an exercise price equal to the quoted closing market price of the Company's common stock on the grant date. Awards of stock or restricted stock are expensed as compensation over the benefit period based on the fair value of the stock on the grant date. For share-based awards with a performance or market measure, we recognize compensation cost over the requisite service period, using the accelerated attribution expense method. The requisite service period begins on the date the compensation committee of SL Green's board of directors authorizes the award, adopts any relevant performance measures and communicates the award to the employees. For programs with awards that vest based on the achievement of a performance condition or market condition, we determine whether it is probable that the performance condition will be met, and estimate compensation cost based on the fair value of the award at the applicable reporting date estimated using a binomial model or market quotes. For share-based awards for which there is no pre-established performance measure, we recognize compensation cost over the service vesting period, which represents the requisite service period, on a straight-line basis. In accordance with the provisions of our share-based incentive compensation plans, we accept the return of shares of the Company's common stock, at the current quoted market price, from certain key employees to satisfy minimum statutory tax-withholding requirements related to shares that vested during the period. Awards can also be made in the form of a separate series of units of limited partnership interest in the Operating Partnership called long-term incentive plan units, or LTIP units. LTIP units, which can be granted either as free-standing awards or in tandem with other awards under our stock incentive plan, are valued by reference to the value of the Company's common stock at the time of grant, and are subject to such conditions and restrictions as the compensation committee of the Company's board of directors may determine, including continued employment or service, computation of financial metrics and/or achievement of pre-established performance goals and objectives.
Earnings per Share of the Company	Earnings per Share of the Company The Company presents both basic and diluted earnings per share, or EPS. Basic EPS excludes dilution and is computed by dividing net income or loss attributable to common stockholders by the weighted average number of common shares outstanding during the period. Basic EPS includes participating securities, consisting of unvested restricted stock that receive nonforfeitable dividends similar to shares of common stock. Diluted EPS reflects the potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted into common stock, where such exercise or conversion would result in a lower EPS amount. Diluted EPS also includes units of limited partnership interest. The dilutive effect of stock options is reflected in the weighted average diluted outstanding shares calculation by application of the treasury stock method. There is no dilutive effect for the exchangeable senior notes as the conversion premium will be paid in cash.
Earnings per Unit of the Operating Partnership	Earnings per Unit of the Operating Partnership The Operating Partnership presents both basic and diluted earnings per unit, or EPU. Basic EPU excludes dilution and is computed by dividing net income or loss attributable to common unitholders by the weighted average number of common units outstanding during the period. Basic EPU includes participating securities, consisting of unvested restricted units that receive nonforfeitable dividends similar to shares of common units. Diluted EPU reflects the potential dilution that could occur if securities or other contracts to issue common units were exercised or converted into common units, where such exercise or conversion would result in a lower EPU amount. The dilutive effect of unit options is reflected in the weighted average diluted outstanding units calculation by application of the treasury stock method. There is no dilutive effect for the exchangeable senior notes as the conversion premium will be paid in cash.
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from those estimates.
Concentrations of Credit Risk	Concentrations of Credit Risk Financial instruments that potentially subject us to concentrations of credit risk consist primarily of cash investments, debt and preferred equity investments and accounts receivable. We place our cash investments in excess of insured amounts with high quality financial institutions. The collateral securing our debt and preferred equity investments is located in New York City. See Note 5, "Debt and Preferred Equity Investments." We perform ongoing credit evaluations of our tenants and require most tenants to provide security deposits or letters of credit. Though these security deposits and letters of credit are insufficient to meet the total value of a tenant's lease obligation, they are a measure of good faith and a source of funds to offset the economic costs associated with lost rent and the costs associated with re-tenanting a space. Although the properties in our real estate portfolio are primarily located in Manhattan, we also have properties located in Brooklyn, Long Island, Westchester County, Connecticut and New Jersey. The tenants located in our buildings operate in various industries.
Reclassification	Reclassification Certain prior year balances have been reclassified to conform to our current year presentation.
Accounting Standards Updates	Accounting Standards Updates In June 2016, the FASB issued Accounting Standards Update (ASU) No. 2016-13, Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. The guidance changes how entities will measure credit losses for most financial assets and certain other instruments that aren’t measured at fair value through net income. The guidance replaces the current ‘incurred loss’ model with an ‘expected loss’ approach. The guidance is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Early adoption is permitted after December 2018. The Company has not yet adopted this new guidance and is currently evaluating the impact of adopting this new accounting standard on the Company’s consolidated financial statements. In March 2016, the FASB issued Accounting Standards Update (ASU) No. 2016-09, Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting. The guidance simplifies the accounting for share-based payment award transactions including: income tax consequences, classification of awards as either equity or liabilities and classification on the statement of cash flows. The guidance is effective for fiscal years beginning after December 15, 2016, including interim periods within those fiscal years. Early adoption is permitted. The Company has not yet adopted this new guidance and is currently evaluating the impact of adopting this new accounting standard on the Company’s consolidated financial statements. In March 2016, the FASB issued ASU 2016-07, Investments Equity Method and Joint Ventures (Topic 323). The guidance eliminates the requirement that an entity retroactively adopt the equity method of accounting if an investment qualifies for use of the equity method as a result of an increase in the level of ownership or degree of influence. The amendments require that the equity method investor add the cost of acquiring the additional interest in the investee to the current basis of the investor’s previously held interest and adopt the equity method of accounting as of the date the investment becomes qualified for equity method accounting. The guidance is effective for all entities for fiscal years beginning after 15 December 2016 and interim periods within those years. Early adoption is permitted in any interim or annual period. The Company has not yet adopted this new guidance and is currently evaluating the impact of adopting this new accounting standard on the Company’s consolidated financial statements. In February 2016, the FASB issued ASU 2016-02, Leases. The guidance requires lessees to recognize lease assets and lease liabilities for those leases classified as operating leases under the previous standard. The accounting applied by a lessor is largely unchanged from that applied under the previous standard. The Guidance is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. Early adoption is permitted. The Company has not yet adopted this new guidance and is currently evaluating the impact of adopting this new accounting standard on the Company’s consolidated financial statements. In January 2016, the FASB issued ASU 2016-01 (ASU825-10), Recognition and Measurement of Financial Assets and Financial Liabilities. The guidance requires entities to measure equity investments that do not result in consolidation and are not accounted for under the equity method at fair value and to record changes in instruments-specific credit risk for financial liabilities measured under the fair value option in other comprehensive income. The guidance is effective for fiscal years beginning after December 15, 2017, and for interim periods therein. The Company has not yet adopted this new guidance and is currently evaluating the impact of adopting this new accounting standard on the Company’s consolidated financial statements. In April 2015, the FASB issued final guidance to simplify the presentation of debt issuance costs by requiring debt issuance costs to be presented as a deduction from the corresponding debt liability (ASU 2015-03). The guidance requires that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability. The Company adopted the guidance effective January 1, 2016. Accordingly, as of June 30, 2016 and December 31, 2015, $101.5 million and $130.3 million, respectively, of deferred debt issuance cost, net of amortization are presented as a direct reduction within Mortgages and other loans payable, Revolving credit facility, Term loan and senior unsecured notes on the Company's consolidated balance sheets. In February 2015, the FASB issued guidance that amends the current consolidation guidance, including introducing a separate consolidation analysis specific to limited partnerships and other similar entities (ASU 2015-02). Under this analysis, limited partnerships and other similar entities will be considered a VIE unless the limited partners hold substantive kick-out rights or participating rights. The Company adopted the guidance effective January 1, 2016. Under the revised guidance, certain entities, including the Operating Partnership, now qualify as variable interest entities while some of our entities originally classified as variable interest entities no longer meet the criteria. The change in designation did not have a material impact on our consolidated financial statements and did not change the consolidation conclusion on these entities. In May 2014, the FASB issued a new comprehensive revenue recognition guidance which requires us to recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which we expect to be entitled in exchange for those goods and services (ASU 2014-09). The guidance also requires enhanced disclosures to help users of financial statements better understand the nature, amount, timing, and uncertainty of revenue that is recognized. In March 2016, the FASB issued implementation guidance which clarifies principal versus agent considerations in reporting revenue gross versus net (ASU 2016-08). In April 2016, the FASB issued implementation guidance which clarifies the identification of performance obligations (ASU 2016-10). In April 2016, the FASB amended its new revenue recognition guidance on identifying performance obligations to allow entities to disregard items that are immaterial and clarify when a good or service is separately identifiable (ASU 2016-10). In May 2016, the FASB issued implementation guidance relating to transition, collectability, noncash consideration and presentation matters (ASU 2016-12). These ASUs are effective for annual and interim periods beginning after December 15, 2017. Early adoption is permitted, but not before interim and annual reporting periods beginning after December 15, 2016. The new guidance can be applied either retrospectively to each prior reporting period presented, or as a cumulative-effect adjustment as of the date of adoption. The Company has not yet adopted this guidance and is currently evaluating the new guidance to determine the impact it may have on our consolidated financial statements.

Organization and Basis of Presentation (Tables)

6 Months Ended

Jun. 30, 2016

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of commercial office properties



		Consolidated			Unconsolidated		Total
Location	Property Type	Number of Properties		Approximate Square Feet (unaudited)	Number of Properties	Approximate Square Feet (unaudited)	Number of Properties	Approximate Square Feet (unaudited)	Weighted Average Occupancy(1) (unaudited)
Commercial:
Manhattan	Office	25		18,368,606	6	4,244,139	31	22,612,745	95.6	%
	Retail	10	(2)	418,563	9	352,952	19	771,515	87.8	%
	Development/Redevelopment	3		42,635	3	767,311	6	809,946	34.9	%
	Fee Interest	1		176,530	—	—	1	176,530	100.0	%
		39		19,006,334	18	5,364,402	57	24,370,736	93.4	%
Suburban	Office	26	(3)	4,235,300	2	640,000	28	4,875,300	82.1	%
	Retail	1		52,000	—	—	1	52,000	100.0	%
	Development/Redevelopment	1		1,000	1	—	2	1,000	100.0	%
		28		4,288,300	3	640,000	31	4,928,300	82.3	%
Total commercial properties		67		23,294,634	21	6,004,402	88	29,299,036	91.5	%
Residential:
Manhattan	Residential	4	(2)	762,587	17	2,957,282	21	3,719,869	67.5	%
Suburban	Residential	—		—	—	—	—	—	—	%
Total residential properties		4		762,587	17	2,957,282	21	3,719,869	67.5	%
Total portfolio⁽³⁾		71		24,057,221	38	8,961,684	109	33,018,905	88.8	%


(1)	The weighted average occupancy for commercial properties represents the total occupied square feet divided by the total acquisition square footage. The weighted average occupancy for residential properties represents the total occupied units divided by the total available units.


(2)	As of June 30, 2016, we owned a building that was comprised of approximately 270,132 square feet (unaudited) of retail space and approximately 222,855 square feet (unaudited) of residential space. For the purpose of this report, we have included the building in the retail properties count and have bifurcated the square footage into the retail and residential components.


(3)	Includes the property at 500 West Putnam, which is classified as held for sale at June 30, 2016.

Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2016

Accounting Policies [Abstract]

Summary of identified intangible assets (acquired above-market leases and in-place leases) and intangible liabilities (acquired below-market leases)



	June 30, 2016			December 31, 2015
Identified intangible assets (included in other assets):
Gross amount	$	1,022,430		$	939,518
Accumulated amortization	(420,167		)	(403,747		)
Net⁽¹⁾	$	602,263		$	535,771
Identified intangible liabilities (included in deferred revenue):
Gross amount	$	861,539		$	866,561
Accumulated amortization	(498,992		)	(486,928		)
Net⁽¹⁾	$	362,547		$	379,633


(1)	As of June 30, 2016 and December 31, 2015, $0.1 million and $0.2 million, respectively and $0.1 million and $0.1 million, respectively, of net intangible assets and net intangible liabilities, were reclassified to assets held for sale and liabilities related to assets held for sale.

Schedule of marketable securities

At June 30, 2016 and December 31, 2015, we held the following marketable securities (in thousands):



	June 30, 2016		December 31, 2015
Equity marketable securities	$	334	$	4,704
Commercial mortgage-backed securities	39,005		40,434
Total marketable securities available-for-sale	$	39,339	$	45,138

- Definition

Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities.

+ References + Details

Property Acquisitions (Tables)

6 Months Ended

Jun. 30, 2016

2016 Acquisitions

Property Acquisitions

Schedule of Recognized Identified Assets Acquired and Liabilities Assumed



	183 Broadway⁽¹⁾
Acquisition Date	March 2016
Ownership Type	Fee Interest
Property Type	Retail/Residential

Purchase Price Allocation:
Land	$	26,640
Building and building leasehold	2,960
Above-market lease value	—
Acquired in-place leases	—
Other assets, net of other liabilities	—
Assets acquired	29,600
Mark-to-market assumed debt	—
Below-market lease value	—
Derivatives	—
Liabilities assumed	—
Purchase price	$	29,600
Net consideration funded by us at closing, excluding consideration financed by debt	$	29,600
Equity and/or debt investment held	$	—
Debt assumed	$	—


(1)	We are currently in the process of analyzing the purchase price allocation and, as such, we have not allocated any value to intangible assets such as above- and below-market lease or in-place leases.

2015 Acquisitions

Property Acquisitions

Schedule of Recognized Identified Assets Acquired and Liabilities Assumed



	Upper Eastside Residential ⁽¹⁾		11 Madison Avenue ⁽¹⁾			1640 Flatbush Avenue⁽¹⁾
Acquisition Date	June 2015		August 2015			March 2015
Ownership Type	Fee Interest		Fee Interest			Fee Interest
Property Type	Residential/Retail		Office			Retail

Purchase Price Allocation:
Land	$	48,152	$	675,776		$	6,226
Building and building leasehold	—		1,553,602			501
Above-market lease value	—		19,764			—
Acquired in-place leases	1,922		366,949			146
Other assets, net of other liabilities	—		—			—
Assets acquired	50,074		2,616,091			6,873
Mark-to-market assumed debt	—		—			—
Below-market lease value	—		(187,732		)	(73		)
Derivatives	—		—			—
Liabilities assumed	—		(187,732		)	(73		)
Purchase price	$	50,074	$	2,428,359		$	6,800
Net consideration funded by us at closing, excluding consideration financed by debt	$	—	$	—		$	—
Equity and/or debt investment held	$	—	$	—		$	—
Debt assumed	$	—	$	—		$	—

(1)

Properties Held for Sale and Property Dispositions (Tables)

6 Months Ended

Jun. 30, 2016

Discontinued Operations and Disposal Groups [Abstract]

Summary of properties sold and income from discontinued operations

The following table summarizes the properties sold during the six months ended June 30, 2016:



Property	Disposition Date	Property Type	Approximate Square Feet	Sales Price⁽¹⁾ (in millions)		Gain on Sale⁽²⁾ (in millions)
248-252 Bedford Avenue	February 2016	Residential	66,611	$	55.0	$	15.3
885 Third Avenue ⁽³⁾	February 2016	Land	607,000	453.0		—
7 International Drive	May 2016	Land	31 Acres	20.0		(6.9		)
388 Greenwich	June 2016	Office	2,635,000	2,002.3		206.5


(1)	Sales price represents the gross sales price for a property or the gross asset valuation for interests in a property.


(2)	The gain on sale for 248-252 Bedford Avenue and 388 Greenwich are net of $1.3 million and $1.6 million, respectively in employee compensation awards accrued in connection with the realization of the investment gain as a bonus to certain employees that were instrumental in realizing the gain on sale. Additionally, amounts do not include adjustments for expenses recorded in subsequent periods.


(3)	In February 2016, we closed on the sale of 885 Third Avenue. The sale did not meet the criteria for sale accounting and as a result the property remains on our consolidated balance sheet until the criteria is met. An estimated loss relating to the sale of $6.6 million was recorded in December 2015.



	Three and six months ended June 30, 2015
Revenues
Rental revenue	$	236
Escalation and reimbursement revenues	(127		)
Other income	—
Total revenues	109
Operating expenses	(631		)
Real estate taxes	250
Ground rent	—
Transaction related costs	(49		)
Depreciable real estate reserves	109
Interest expense, net of interest income	3
Amortization of deferred financing costs	—
Depreciation and amortization
Total expenses	(318		)
Net income from discontinued operations	$	427

- Definition

Tabular disclosure of information related to a disposal group. Includes, but is not limited to, a discontinued operation, disposal classified as held-for-sale or disposed of by means other than sale or disposal of an individually significant component.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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+ Details

Debt and Preferred Equity Investments (Tables)

6 Months Ended

Jun. 30, 2016

Investments, Debt and Equity Securities [Abstract]

Summary of debt investments

As of June 30, 2016 and December 31, 2015 we held the following debt investments with an aggregate weighted average current yield of 9.55% at June 30, 2016 (in thousands):



Loan Type	June 30, 2016 Future Funding Obligations		June 30, 2016 Senior Financing		June 30, 2016 Carrying Value ⁽¹⁾		December 31, 2015 Carrying Value ⁽¹⁾		Maturity Date ⁽²⁾
Fixed Rate Investments:
Mezzanine Loan	$	—	$	165,000	$	72,271	$	72,102	October 2016
Jr. Mortgage Participation/Mezzanine Loan	—		1,109,000		189,380		104,661		March 2017
Mezzanine Loan^(3a)	10,000		502,100		55,988		41,115		June 2017
Mortgage Loan⁽⁴⁾	—		—		26,284		26,262		February 2019
Mortgage Loan	—		—		447		513		August 2019
Mezzanine Loan	—		15,000		3,500		3,500		September 2021
Mezzanine Loan^(3b)	—		89,527		19,939		19,936		November 2023
Mezzanine Loan^(3c)	—		115,000		12,921		24,916		June 2024
Mezzanine Loan	—		95,000		30,000		30,000		January 2025
Mezzanine Loan⁽⁵⁾	—		—		—		49,691
Jr. Mortgage Participation⁽⁶⁾	—		—		—		49,000
Other⁽⁶⁾⁽⁷⁾	—		—		—		23,510
Other⁽⁶⁾⁽⁷⁾	—		—		—		66,183
Total fixed rate	$	10,000	$	2,090,627	$	410,730	$	511,389
Floating Rate Investments:
Mortgage/Mezzanine Loan⁽⁸⁾	—		—		105,278		94,901		October 2016
Mezzanine Loan	—		360,000		99,811		99,530		November 2016
Mezzanine Loan	8,459		136,384		52,827		49,751		December 2016
Mezzanine Loan	281		39,201		13,761		13,731		December 2016
Mortgage/Mezzanine Loan^(3d)	43,572		—		137,150		134,264		January 2017
Mezzanine Loan	1,127		118,949		28,796		28,551		January 2017
Mezzanine Loan^(3e)(9)	—		40,000		15,212		68,977		June 2017
Mortgage/ Mezzanine Loan	—		—		32,679		—		June 2017
Mortgage/Mezzanine Loan	—		—		22,919		22,877		July 2017
Mortgage/Mezzanine Loan	—		—		16,931		16,901		September 2017
Mortgage/Mezzanine Loan	4,234		—		19,607		19,282		October 2017
Mezzanine Loan	—		60,000		14,931		14,904		November 2017
Mezzanine Loan^(3f)	—		85,000		15,011		29,505		December 2017
Mezzanine Loan^(3g)	—		65,000		14,542		28,563		December 2017
Mortgage/Mezzanine Loan^(3h)	795		—		14,998		14,942		December 2017
Jr. Mortgage Participation	—		40,000		19,880		19,846		April 2018
Mezzanine Loan	—		175,000		34,785		34,725		April 2018
Jr. Mortgage Participation/Mezzanine Loan⁽³ⁱ⁾	—		55,000		10,512		20,510		July 2018
Mortgage/Mezzanine Loan⁽¹⁰⁾	523		20,523		10,829		31,210		August 2018
Mezzanine Loan	2,325		45,025		34,318		—		October 2018
Mezzanine Loan	—		33,000		26,812		26,777		December 2018
Mezzanine Loan	4,560		156,383		54,731		52,774		December 2018
Mezzanine Loan	23,456		217,202		55,217		49,625		December 2018



Loan Type	June 30, 2016 Future Funding Obligations		June 30, 2016 Senior Financing		June 30, 2016 Carrying Value ⁽¹⁾		December 31, 2015 Carrying Value ⁽¹⁾		Maturity Date ⁽²⁾
Mezzanine Loan	6,383		16,383		5,363		—		January 2019
Mezzanine Loan	—		38,000		21,869		21,845		March 2019
Mezzanine Loan	—		265,000		24,646		—		April 2019
Mezzanine Loan⁽¹¹⁾	—		—		—		22,625
Mezzanine Loan⁽¹²⁾	—		—		—		74,700
Mezzanine Loan⁽¹³⁾	—		—		—		66,398
Jr. Mortgage Participation/Mezzanine Loan⁽⁶⁾	—		—		—		18,395
Mezzanine Loan⁽¹⁴⁾	—		—		—		40,346
Total floating rate	$	95,715	$	1,966,050	$	903,415	$	1,116,455
Total	$	105,715	$	4,056,677	$	1,314,145	$	1,627,844


(1)	Carrying value is net of discounts, premiums, original issue discounts and deferred origination fees.


(2)	Represents contractual maturity, excluding any unexercised extension options.

(3)


(4)	In September 2014, we acquired a $26.4 million mortgage loan at a $0.2 million discount and a $5.7 million junior mortgage participation at a $5.7 million discount. The junior mortgage participation was a nonperforming loan at acquisition and is currently on non-accrual status.


(5)	In April 2016, we closed on an option to acquire a 20% interest in the underlying asset at a previously agreed upon purchase option valuation, and our mezzanine loan was simultaneously repaid.


(6)	These loans were repaid in March 2016.


(7)	These loans were collateralized by defeasance securities.


(8)	In April 2016, the maturity date was extended to October 2016.


(9)	In March 2016, the mortgage was sold.


(10)	In January 2016, the loans were modified. In March 2016, the mortgage was sold.


(11)	This loan was repaid in June 2016.


(12)	This loan was repaid in May 2016.


(13)	In March 2016, we contributed our interest in the loan in exchange for a joint venture interest which is now accounted for under the equity method of accounting. It is included in unconsolidated joint ventures on the consolidated balance sheets.


(14)	These loans were repaid in February 2016.

Summary of preferred equity investments

As of June 30, 2016 and December 31, 2015, we held the following preferred equity investments with an aggregate weighted average current yield of 7.97% at June 30, 2016 (in thousands):



Type	June 30, 2016 Future Funding Obligations		June 30, 2016 Senior Financing		June 30, 2016 Carrying Value ⁽¹⁾		December 31, 2015 Carrying Value ⁽¹⁾		Initial Mandatory Redemption
Preferred equity	$	—	$	71,486	$	9,974	$	9,967	March 2018
Preferred equity	4,779		59,966		33,062		32,209		November 2018
Total	$	4,779	$	131,452	$	43,036	$	42,176


(1)	Carrying value is net of deferred origination fees.

Investments in Unconsolidated Joint Ventures (Tables)

6 Months Ended

Jun. 30, 2016

Equity Method Investments and Joint Ventures [Abstract]

Schedule of general information on joint ventures

The table below provides general information on each of our joint ventures as of June 30, 2016:



Property	Partner	Ownership Interest	Economic Interest	Approximate Square Feet	Acquisition Date	Acquisition Price⁽¹⁾ (in thousands)
100 Park Avenue	Prudential Real Estate Investors	49.90%	49.90%	834,000	January 2000	$	95,800
717 Fifth Avenue	Jeff Sutton/Private Investor	10.92%	10.92%	119,500	September 2006	251,900
800 Third Avenue	Private Investors	60.52%	60.52%	526,000	December 2006	285,000
1745 Broadway	Ivanhoe Cambridge, Inc.	56.88%	56.88%	674,000	April 2007	520,000
Jericho Plaza ⁽²⁾	Onyx Equities/Private Investor	11.67%	11.67%	640,000	April 2007	210,000
11 West 34th Street	Private Investor/ Jeff Sutton	30.00%	30.00%	17,150	December 2010	10,800
3 Columbus Circle⁽³⁾	The Moinian Group	48.90%	48.90%	741,500	January 2011	500,000
280 Park Avenue	Vornado Realty Trust	50.00%	50.00%	1,219,158	March 2011	400,000
1552-1560 Broadway⁽⁴⁾	Jeff Sutton	50.00%	50.00%	35,897	August 2011	136,550
724 Fifth Avenue	Jeff Sutton	50.00%	50.00%	65,040	January 2012	223,000
10 East 53rd Street	Canadian Pension Plan Investment Board	55.00%	55.00%	354,300	February 2012	252,500
521 Fifth Avenue	Plaza Global Real Estate Partners LP	50.50%	50.50%	460,000	November 2012	315,000
21 East 66th Street⁽⁵⁾	Private Investors	32.28%	32.28%	16,736	December 2012	75,000
650 Fifth Avenue⁽⁶⁾	Jeff Sutton	50.00%	50.00%	32,324	November 2013
121 Greene Street	Jeff Sutton	50.00%	50.00%	7,131	September 2014	27,400
175-225 Third Street Brooklyn, New York	KCLW 3rd Street LLC/LIVWRK LLC	95.00%	95.00%	—	October 2014	74,600
55 West 46th Street	Prudential Real Estate Investors	25.00%	25.00%	347,000	November 2014	295,000
Stonehenge Portfolio	Various	Various	Various	2,046,733	Various	36,668
131-137 Spring Street	Invesco Real Estate	20.00%	20.00%	68,342	August 2015	277,750
76 11th Avenue⁽⁷⁾	Oxford/Vornado	33.33%	36.58%	764,000	March 2016	138,240
605 West 42nd Street⁽⁸⁾	The Moinian Group	20.00%	20.00%	927,358	April 2016	759,000


(1)	Acquisition price represents the actual or implied gross purchase price for the joint venture, which is not adjusted for subsequent acquisitions of additional interests.


(2)	Our ownership percentage was reduced in the first quarter of 2016, from 77.78% to 11.67%, upon completion of the restructuring of the joint venture.


(3)	As a result of the sale of a condominium interest in September 2012, Young & Rubicam, Inc., or Y&R, owns floors three through eight at the property. Because the joint venture has an option to repurchase these floors, the gain associated with this sale was deferred.


(4)	The purchase price represents only the purchase of the 1552 Broadway interest which comprised approximately 13,045 square feet. The joint venture also owns a long-term leasehold interest in the retail space and certain other spaces at 1560 Broadway, which is adjacent to 1552 Broadway.


(5)	We hold a 32.28% interest in three retail and two residential units at the property and a 16.14% interest in three residential units at the property.

(6)


(7)	The joint venture owns two mezzanine notes secured by interests in the entity that owns 76 11th Avenue. The difference between our ownership interest and our economic interest results from our right to 50% of the total exit fee while each of our partners is entitled to receive 25% of the total exit fee.


(8)	The Company was granted an option to purchase the interest at an agreed upon valuation in July 2014 when it originated a $50.0 million mezzanine loan to the project's developer. The mezzanine loan was repaid prior to the closing of the Company's acquisition of its joint venture interest.

As of June 30, 2016 and December 31, 2015, the carrying value for acquisition, development and construction arrangements were as follows (in thousands):



Loan Type	June 30, 2016		December 31, 2015		Initial Maturity Date
Mezzanine loan and preferred equity	$	100,000	$	99,936	March 2017
Mezzanine loan⁽¹⁾	45,719		45,942		February 2022
	$	145,719	$	145,878


(1)	We have an option to convert our loan to an equity interest subject to certain conditions. We have determined that our option to convert the loan to equity is not a derivative financial instrument pursuant to GAAP.

The following table summarizes the investments in unconsolidated joint ventures sold during the six months ended June 30, 2016:



Property	Ownership Percentage	Disposition Date	Type of Sale	Gross Asset Valuation (in thousands)⁽¹⁾		Gain on Sale (in thousands)⁽²⁾
1 Jericho Plaza ⁽³⁾	66.11%	February 2016	Office	$	95,200	$	3,300
7 Renaissance Square	50.00%	March 2016	Office	$	20,700	$	4,200
EOP Denver	4.79%	March 2016	Office	$	180,700	$	2,800
33 Beekman ⁽⁴⁾	45.90%	May 2016	Residential	$	196,000	$	33,000


(1)	Represents implied gross valuation for the joint venture or sales price of the property.


(2)	Represents the Company's share of the gain. The gain on sale is net of $1.1 million employee compensation awards accrued in connection with the realization of these investment gains as a bonus to certain employees that were instrumental in realizing the gains on sale.


(3)	Our ownership percentage was reduced in the first quarter of 2016, from 77.78% to 11.67%, upon completion of the restructuring of the joint venture.


(4)	In connection with the sale of the property, we also recognized a promote of $10.8 million.

Schedule of first mortgage notes payable collateralized by the respective joint venture properties and assignment of leases

The first mortgage notes and other loans payable collateralized by the respective joint venture properties and assignment of leases at June 30, 2016 and December 31, 2015, respectively, are as follows (amounts in thousands):



Property	Maturity Date	Interest Rate⁽¹⁾		June 30, 2016		December 31, 2015
Fixed Rate Debt:
1745 Broadway	January 2017	5.68	%	$	340,000	$	340,000
521 Fifth Avenue	November 2019	3.73	%	170,000		170,000
717 Fifth Avenue⁽²⁾	July 2022	4.45	%	300,000		300,000
717 Fifth Avenue⁽²⁾	July 2022	6.27	%	355,328		325,704
21 East 66th Street	April 2023	3.60	%	12,000		12,000
3 Columbus Circle	March 2025	3.61	%	350,000		350,000
800 Third Avenue	February 2026	3.17	%	177,000		20,910
Stonehenge Portfolio⁽³⁾	Various	4.19	%	364,249		430,627
280 Park Avenue				—		692,963



Property	Maturity Date	Interest Rate⁽¹⁾		June 30, 2016			December 31, 2015
7 Renaissance Square				—			2,927
Total fixed rate debt				$	2,068,577		$	2,645,131
Floating Rate Debt:
650 Fifth Avenue ⁽⁴⁾	October 2016	3.94	%	$	65,000		$	65,000
175-225 Third Street	December 2016	4.50	%	40,000			40,000
10 East 53rd Street	February 2017	2.94	%	125,000			125,000
724 Fifth Avenue	April 2017	2.86	%	275,000			275,000
1552 Broadway ⁽⁵⁾	April 2017	4.66	%	185,410			190,409
55 West 46th Street ⁽⁶⁾	October 2017	2.74	%	151,536			150,000
Jericho Plaza⁽⁷⁾	March 2018	4.59	%	75,799			163,750
605 West 42nd Street	July 2018	2.56	%	539,000			—
280 Park Avenue	June 2019	2.44	%	900,000			30,000
121 Greene Street	November 2019	1.94	%	15,000			15,000
131-137 Spring Street	August 2020	1.99	%	141,000			141,000
11 West 34th Street	January 2021	1.89	%	23,000			23,000
100 Park Avenue	February 2021	2.19	%	360,000			360,000
21 East 66th Street	June 2033	2.00	%	1,765			1,805
Stonehenge Portfolio⁽⁸⁾	Various	5.81	%	65,489			10,500
33 Beekman				—			73,518
Total floating rate debt				$	2,962,999		$	1,663,982
Total joint venture mortgages and other loans payable				$	5,031,576		$	4,309,113
Deferred financing costs, net				(109,083		)	(42,565		)
Total joint venture mortgages and other loans payable, net				$	4,922,493		$	4,266,548


(1)	Effective weighted average interest rate for the three months ended June 30, 2016, taking into account interest rate hedges in effect during the period.


(2)	These loans are comprised of a $300.0 million fixed rate mortgage loan and $355.3 million mezzanine loan. The mezzanine loan is subject to accretion based on the difference between contractual interest rate and contractual pay rate.


(3)	Amount is comprised of $13.2 million, $34.6 million, , $140.3 million, and $176.2 million in fixed-rate mortgages that mature in October 2016, November 2017, August 2019, and June 2024, respectively.


(4)	This loan has a committed amount of $97.0 million, of which $32.0 million was unfunded as of June 30, 2016.


(5)	These loans are comprised of a $145.0 million mortgage loan and a $41.5 million mezzanine loan. As of June 30, 2016, $0.6 million of the mortgage loan and $0.5 million of the mezzanine loan were unfunded.


(6)	This loan has a committed amount of $190.0 million, of which $38.5 million was unfunded as of June 30, 2016.


(7)	We hold an 11.67% non-controlling interest in the joint venture and the property secures a two year $100.0 million loan, of which $75.8 million is currently outstanding.


(8)	Amount is comprised of $55.2 million and $10.3 million in floating-rate mortgages that mature in June 2017 and December 2017, respectively.

Schedule of combined balance sheets for the unconsolidated joint ventures

The combined balance sheets for the unconsolidated joint ventures, at June 30, 2016 and December 31, 2015 are as follows (in thousands):



	June 30, 2016		December 31, 2015
Assets
Commercial real estate property, net	$	6,510,775	$	6,122,468
Debt and preferred equity investments, net	304,901		145,878
Other assets	741,839		715,840
Total assets	$	7,557,515	$	6,984,186
Liabilities and members' equity
Mortgages and other loans payable, net	$	4,922,493	$	4,266,548
Other liabilities	534,611		523,160
Members' equity	2,100,411		2,194,478
Total liabilities and members' equity	$	7,557,515	$	6,984,186
Company's investments in unconsolidated joint ventures	$	1,126,486	$	1,203,858

Schedule of combined statements of income for the unconsolidated joint ventures

The combined statements of operations for the unconsolidated joint ventures, from acquisition date through the three and six months ended June 30, 2016 and 2015, are as follows (in thousands):



	Three Months Ended June 30,					Six Months Ended June 30,
	2016		2015			2016			2015
Total revenues	$	151,575	$	143,535		$	314,087		$	272,451
Operating expenses	27,166		26,345			54,420			51,831
Ground rent	3,715		2,572			6,926			5,164
Real estate taxes	24,332		22,335			48,542			41,711
Interest expense, net of interest income	46,351		51,715			96,087			95,722
Amortization of deferred financing costs	7,276		3,145			10,512			6,155
Transaction related costs	—		3			—			11
Depreciation and amortization	37,294		37,894			75,145			70,878
Total expenses	146,134		144,009			291,632			271,472
Loss on early extinguishment of debt	—		—			(1,606		)	(833		)
Net income (loss) before gain on sale	$	5,441	$	(474	)	$	20,849		$	146
Company's equity in net income from unconsolidated joint ventures	$	5,841	$	2,994		$	15,937		$	7,024

Deferred Costs (Tables)

6 Months Ended

Jun. 30, 2016

Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]

Schedule of components of deferred costs

Deferred costs at June 30, 2016 and December 31, 2015 consisted of the following (in thousands):



	June 30, 2016			December 31, 2015
Deferred leasing	$	447,805		$	415,406
Less: accumulated amortization	(191,502		)	(175,486		)
Deferred costs, net	$	256,303		$	239,920

Mortgages and Other Loans Payable (Tables)

6 Months Ended

Jun. 30, 2016

Mortgages and Other Loans Payable

Schedule of first mortgages and other loans payable collateralized by the respective properties and assignment of leases



Property	Maturity Date	Interest Rate⁽¹⁾		June 30, 2016			December 31, 2015
Fixed Rate Debt:
Landmark Square	December 2016	4.00	%	$	78,682		$	79,562
FHLB Facility	January 2017	1.03	%	105,000			—
FHLB Facility	January 2017	0.80	%	100,000			—
485 Lexington Avenue	February 2017	5.61	%	450,000			450,000
762 Madison Avenue	February 2017	3.86	%	7,784			7,872
885 Third Avenue⁽²⁾	July 2017	6.26	%	267,650			267,650
Unsecured Loan	June 2018	4.81	%	16,000			16,000
One Madison Avenue	May 2020	5.91	%	530,876			542,817
100 Church Street	July 2022	4.68	%	223,294			225,099
919 Third Avenue⁽³⁾	June 2023	5.12	%	500,000			500,000
400 East 57th Street	February 2024	4.13	%	66,998			67,644
400 East 58th Street	February 2024	4.13	%	28,713			28,990
420 Lexington Avenue	October 2024	3.99	%	300,000			300,000
1515 Broadway	March 2025	3.93	%	896,248			900,000
11 Madison Avenue	September 2025	3.84	%	1,400,000			1,400,000
Series J Preferred Units⁽⁴⁾	April 2051	3.75	%	4,000			4,000
388-390 Greenwich Street⁽⁵⁾				—			1,004,000
500 West Putnam Avenue⁽⁶⁾				—			22,376
Total fixed rate debt				$	4,975,245		$	5,816,010
Floating Rate Debt:
Master Repurchase Agreement⁽⁷⁾	July 2016	3.59	%	$	134,259		$	253,424
FHLB Facility	December 2016	0.72	%	24,000			45,750
600 Lexington Avenue	October 2017	2.63	%	110,857			112,795
719 Seventh Avenue	February 2018	3.49	%	27,514			—
183,187 Broadway & 5-7 Dey Street	May 2018	3.11	%	58,000			40,000
1080 Amsterdam	November 2018	4.19	%	3,525			3,525
220 East 42nd Street	October 2020	2.04	%	275,000			275,000
388-390 Greenwich Street⁽⁵⁾				—			446,000
248-252 Bedford Avenue⁽⁸⁾				—			29,000
Total floating rate debt				$	633,155		$	1,205,494
Total fixed rate and floating rate debt				$	5,608,400		$	7,021,504
Mortgages reclassed to liabilities related to assets held for sale⁽⁵⁾⁽⁸⁾				—			(29,000		)
Total mortgages and other loans payable				$	5,608,400		$	6,992,504
Deferred financing costs, net of amortization				(84,290		)	(110,584		)
Total mortgages and other loans payable, net				$	5,524,110		$	6,881,920


(1)	Effective weighted average interest rate for the quarter ended June 30, 2016, taking into account interest rate hedges in effect during the period.


(2)	In February 2016, we closed on the sale of 885 Third Avenue. The sale did not meet the criteria for sale accounting and as a result the property remains on our consolidated balance sheet until the criteria is met.


(3)	We own a 51.0% controlling interest in the consolidated joint venture that is the borrower on this loan.

(4)


(5)	In June 2016, we closed on the sale of 388-390 Greenwich Street. At March 31, 2016, this property was classified as a held for sale property and the related mortgage, net of deferred financing costs, net of amortization of $24.5 million, was included in liabilities related to assets held for sale.


(6)	In January 2016, the mortgage was repaid.


(7)	In July 2016, we entered into a new Master Repurchase Agreement, with a maximum facility capacity of $300.0 million that bears interest ranging from 225 and 400 basis points over 30-day LIBOR, depending on the pledged collateral. The new MRA has an initial maturity date of July 2018, with an extension term of one additional year.


(8)	The property at 248-252 Bedford Avenue in Brooklyn, New York was sold in February 2016. At December 31, 2015 this property was held for sale and the related mortgage, net of deferred financing, net of amortization costs of $0.9 million, was included in liabilities related to assets held for sale.

Corporate Indebtedness (Tables)

6 Months Ended

Jun. 30, 2016

Debt Disclosure [Abstract]

Schedule of senior unsecured notes and other related disclosures by scheduled maturity date

The following table sets forth our senior unsecured notes and other related disclosures as of June 30, 2016 and December 31, 2015, respectively, by scheduled maturity date (dollars in thousands):



Issuance	June 30, 2016 Unpaid Principal Balance		June 30, 2016 Accreted Balance			December 31, 2015 Accreted Balance			Coupon Rate⁽¹⁾		Effective Rate		Term (in Years)	Maturity Date
October 12, 2010⁽²⁾	$	345,000	$	327,489		$	321,130		3.00	%	3.00	%	7	October 2017
August 5, 2011⁽³⁾	250,000		249,845			249,810			5.00	%	5.00	%	7	August 2018
March 16, 2010⁽³⁾	250,000		250,000			250,000			7.75	%	7.75	%	10	March 2020
November 15, 2012⁽³⁾	200,000		200,000			200,000			4.50	%	4.50	%	10	December 2022
December 17, 2015⁽³⁾	100,000		100,000			100,000			4.27	%	4.27	%	10	December 2025
March 26, 2007⁽⁴⁾	10,008		10,008			10,008			3.00	%	3.00	%	20	March 2027
March 31, 2006⁽⁵⁾	—		—			255,296
	$	1,155,008	$	1,137,342		$	1,386,244
Deferred financing costs, net			(6,652		)	(7,280		)
	$	1,155,008	$	1,130,690		$	1,378,964


(1)	Interest on the senior unsecured notes is payable semi-annually with principal and unpaid interest due on the scheduled maturity dates.

(2)


(3)	Issued by the Company, the Operating Partnership and ROP, as co-obligors.

(4)


(5)	Issued by ROP, balance was repaid in March 2016.

Schedule of combined aggregate principal maturities



	Scheduled Amortization		Principal		Revolving Credit Facility		Unsecured Term Loan		Trust Preferred Securities		Senior Unsecured Notes		Total		Joint Venture Debt
Remaining 2016	$	29,859	$	236,194	$	—	$	—	$	—	$	—	$	266,053	$	163,575
2017	63,644		1,094,548		—		—		—		355,008		1,513,200		549,135
2018	64,119		47,039		—		—		—		250,000		361,158		9,293
2019	70,255		—		—		933,000		—		—		1,003,255		554,686
2020	52,799		679,531		285,000		—		—		250,000		1,267,330		30,298
Thereafter	147,604		3,122,974		—		—		100,000		300,000		3,670,578		547,167
	$	428,280	$	5,180,286	$	285,000	$	933,000	$	100,000	$	1,155,008	$	8,081,574	$	1,854,154

Schedule of consolidated interest expense, excluding capitalized interest

Consolidated interest expense, excluding capitalized interest, was comprised of the following (in thousands):



	Three Months Ended June 30,						Six Months Ended June 30,
	2016			2015			2016			2015
Interest expense	$	95,568		$	84,083		$	197,722		$	169,099
Interest capitalized	(5,433		)	(7,611		)	(12,051		)	(16,169		)
Interest income	(1,046		)	(726		)	(1,910		)	(1,377		)
Interest expense, net	$	89,089		$	75,746		$	183,761		$	151,553

- Definition

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(e),(f))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21538-112644

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21521-112644

+ Details

Related Party Transactions (Tables)

6 Months Ended

Jun. 30, 2016

Schedule of amounts due from/to related parties

Amounts due from related parties at June 30, 2016 and December 31, 2015 consisted of the following (in thousands):



	June 30, 2016		December 31, 2015
Due from joint ventures	$	1,443	$	1,334
Other	11,616		9,316
Related party receivables	$	13,059	$	10,650

Noncontrolling Interests on the Company's Consolidated Financial Statements (Tables)

6 Months Ended

Jun. 30, 2016

Noncontrolling Interest [Abstract]

Schedule of Noncontrolling Interest

Below is the rollforward analysis of the activity relating to the noncontrolling interests in the Operating Partnership as of June 30, 2016 and December 31, 2015 (in thousands):



	June 30, 2016			December 31, 2015
Balance at beginning of period	$	424,206		$	469,524
Distributions	(6,009		)	(9,710		)
Issuance of common units	73,011			30,506
Redemption of common units	(11,795		)	(55,697		)
Net income	6,508			10,565
Accumulated other comprehensive income allocation	(375		)	(67		)
Fair value adjustment	906			(20,915		)
Balance at end of period	$	486,452		$	424,206

Schedule of Preferred Unit Activity

Below is the rollforward analysis of the activity relating to the preferred units in the Operating Partnership as of June 30, 2016 and December 31, 2015 (in thousands):



	June 30, 2016			December 31, 2015
Balance at beginning of period	$	282,516		$	71,115
Issuance of preferred units	22,793			211,601
Redemption of preferred units	(2,849		)	(200		)
Balance at end of period	$	302,460		$	282,516

Stockholders' Equity of the Company (Tables)

6 Months Ended

Jun. 30, 2016

Stockholders' Equity Note [Abstract]

Schedule of Earnings Per Share

SL Green's earnings per share for the three and six months ended June 30, 2016 and 2015 are computed as follows (in thousands):



	Three Months Ended June 30,					Six Months Ended June 30,
Numerator	2016		2015			2016		2015
Basic Earnings:
Income (loss) attributable to SL Green common stockholders	$	133,457	$	(39,106	)	$	156,678	$	4,171
Effect of Dilutive Securities:
Redemption of units to common shares	5,586		—			6,508		166
Diluted Earnings:
Income (loss) attributable to SL Green common stockholders	$	139,043	$	(39,106	)	$	163,186	$	4,337



	Three Months Ended June 30,		Six Months Ended June 30,
Denominator	2016	2015	2016	2015
Basic Shares:
Weighted average common stock outstanding	100,134	99,579	100,093	98,994
Effect of Dilutive Securities:
Operating Partnership units redeemable for common shares	4,342	—	4,158	3,936
Stock-based compensation plans	316	—	282	493
Diluted weighted average common stock outstanding	104,792	99,579	104,533	103,423

Partners' Capital of the Operating Partnership (Tables)

6 Months Ended

Jun. 30, 2016

Equity [Abstract]

Schedule of calculation of numerator and denominator in earnings per unit

The Operating Partnership's earnings per unit for the three and six months ended June 30, 2016 and 2015, respectively are computed as follows (in thousands):



	Three Months Ended June 30,					Six Months Ended June 30,
Numerator	2016		2015			2016		2015
Basic and Diluted Earnings:
Net income (loss) attributable to SLGOP common unitholders	$	139,043	$	(40,683	)	$	163,186	$	4,337



	Three Months Ended June 30,		Six Months Ended June 30,
Denominator	2016	2015	2016	2015
Basic units:
Weighted average common units outstanding	104,476	103,487	104,251	102,930
Effect of Dilutive Securities:
Stock-based compensation plans	316	—	282	493
Diluted weighted average common units outstanding	104,792	103,487	104,533	103,423

Share-based Compensation (Tables)

6 Months Ended

Jun. 30, 2016

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of weighted average assumptions used to estimate the grant date fair value of options granted



	June 30, 2016		December 31, 2015
Dividend yield	2.30	%	1.97	%
Expected life of option	4.2 years		3.6 years
Risk-free interest rate	1.08	%	1.43	%
Expected stock price volatility	29.08	%	32.34	%

Summary of the status of stock options and changes during the period



	June 30, 2016					December 31, 2015
	Options Outstanding			Weighted Average Exercise Price		Options Outstanding			Weighted Average Exercise Price
Balance at beginning of period	$	1,595,007		$	95.52	$	1,462,726		$	87.98
Granted	109,500			99.65		389,836			112.54
Exercised	(75,201		)	75.42		(217,438		)	74.69
Lapsed or cancelled	(39,200		)	113.38		(40,117		)	98.61
Balance at end of period	$	1,590,106		$	96.32	$	1,595,007		$	95.52
Options exercisable at end of period	865,289			$	89.14	589,055			$	89.85
Weighted average fair value of options granted during the period	$	2,258,336				$	9,522,613

Summary of restricted stock and charges during the period

A summary of the Company's restricted stock as of June 30, 2016 and December 31, 2015 and charges during the six months ended June 30, 2016 and the year ended December 31, 2015, are as follows:



	June 30, 2016			December 31, 2015
Balance at beginning of period	3,137,881			3,000,979
Granted	7,500			143,053
Cancelled	(34,600		)	(6,151		)
Balance at end of period	3,110,781			3,137,881
Vested during the period	81,322			87,081
Compensation expense recorded	$	3,372,434		$	7,540,747
Weighted average fair value of restricted stock granted during the period	$	781,330		$	16,061,201

Accumulated Other Comprehensive Loss (Tables)

6 Months Ended

Jun. 30, 2016

SL Green Realty Corp

Accumulated Other Comprehensive Income (Loss) [Line Items]

Schedule of Accumulated Other Comprehensive Income (Loss)

The following tables set forth the changes in accumulated other comprehensive income (loss) by component as of June 30, 2016 (in thousands):



	Net unrealized (loss) gain on derivative instruments⁽¹⁾			SL Green’s share of joint venture net unrealized (loss) gain on derivative instruments⁽²⁾			Unrealized gain (loss) on marketable securities			Total
Balance at December 31, 2015	$	(10,160	)	$	(592	)	$	2,003		$	(8,749	)
Other comprehensive loss before reclassifications	(7,547		)	(6,658		)	(841		)	(15,046		)
Amounts reclassified from accumulated other comprehensive income	6,175			1,062			—			7,237
Balance at June 30, 2016	$	(11,532	)	$	(6,188	)	$	1,162		$	(16,558	)

(1)


(2)	Amount reclassified from accumulated other comprehensive income (loss) is included in equity in net income from unconsolidated joint ventures in the respective consolidated statements of operations.

Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2016

Fair Value Disclosures [Abstract]

Fair Value Measurements, Recurring and Nonrecurring



	June 30, 2016
	Total		Level 1		Level 2		Level 3
Assets:
Marketable securities	$	39,339	$	334	$	39,005	$	—
Interest rate cap and swap agreements (included in other assets)	$	—	$	—	$	—	$	—
Liabilities:
Interest rate cap and swap agreements (included in accrued interest payable and other liabilities)	$	3,036	$	—	$	3,036	$	—
Interest rate cap and swap agreements (included in liabilities related to assets held for sale)	$	—	$	—	$	—	$	—



	December 31, 2015
	Total		Level 1		Level 2		Level 3
Assets:
Marketable securities	$	45,138	$	4,704	$	40,434	$	—
Interest rate cap and swap agreements (included in other assets)	$	204	$	—	$	204	$	—
Liabilities:
Interest rate cap and swap agreements (included in accrued interest payable and other liabilities)	$	10,776	$	—	$	10,776	$	—

Fair Value, by Balance Sheet Grouping

The following table provides the carrying value and fair value of these financial instruments as of June 30, 2016 and December 31, 2015 (in thousands):



	June 30, 2016				December 31, 2015
	Carrying Value		Fair Value		Carrying Value		Fair Value

Debt and preferred equity investments	$	1,357,181	⁽¹⁾		$	1,670,020	⁽¹⁾

Fixed rate debt	$	6,612,587	$	7,058,553	$	7,232,254	$	7,591,388
Variable rate debt	1,451,155		1,445,621		3,202,494		3,179,186
	$	8,063,742	$	8,504,174	$	10,434,748	$	10,770,574


(1)	At June 30, 2016, debt and preferred equity investments had an estimated fair value ranging between $1.4 billion and $1.5 billion. At December 31, 2015, debt and preferred equity investments had an estimated fair value ranging between $1.7 billion and $1.8 billion.

- Definition

Tabular disclosure of financial instruments measured at fair value, including those classified in shareholders' equity measured on a recurring or nonrecurring basis. Disclosures include, but are not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. Nonrecurring fair value measurements are those that are required or permitted in the statement of financial position in particular circumstances.

+ References + Details

Financial Instruments: Derivatives and Hedging (Tables)

6 Months Ended

Jun. 30, 2016

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of notional and fair value of derivative financial instruments and foreign currency hedges



	Notional Value		Strike Rate		Effective Date	Expiration Date	Balance Sheet Location	Fair Value
Interest Rate Swap	$	200,000	0.938	%	October 2014	December 2017	Other Liabilities	$	(1,202	)
Interest Rate Swap	150,000		0.940	%	October 2014	December 2017	Other Liabilities	(906		)
Interest Rate Swap	150,000		0.940	%	October 2014	December 2017	Other Liabilities	(906		)
Interest Rate Cap	117,392		6.000	%	October 2014	October 2016	Other Liabilities	—
Interest Rate Swap	14,409		0.500	%	January 2015	January 2017	Other Liabilities	(4		)
Interest Rate Swap	8,018		0.852	%	February 2015	February 2017	Other Liabilities	(18		)
Interest Rate Cap	137,500		4.000	%	September 2015	September 2017	Other Assets	—
Interest Rate Cap	1,450,000		4.750	%	May 2016	May 2017	Other Assets	—
							Total	$	(3,036	)

Schedule of effect of derivative financial instruments on consolidated statements of income



	Amount of (Loss) Gain Recognized in Other Comprehensive Loss (Effective Portion)						Location of (Loss) Reclassified from Accumulated Other Comprehensive Loss into Income	Amount of Loss Reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion)				Location of (Loss) or Gain Recognized in Income on Derivative	Amount of (Loss) or Gain Recognized into Income (Ineffective Portion)
	Three Months Ended June 30,							Three Months Ended June 30,					Three Months Ended June 30,
Derivative	2016			2015				2016		2015			2016			2015
Interest Rate Swaps/Caps	$	(1,186	)	$	(1,095	)	Interest expense	$	4,468	$	2,737	Interest expense	$	1		$	(14	)
Share of unconsolidated joint ventures' derivative instruments	(3,005		)	277			Equity in net income from unconsolidated joint ventures	567		331		Equity in net income from unconsolidated joint ventures	(600		)	16
	$	(4,191	)	$	(818	)		$	5,035	$	3,068		$	(599	)	$	2

The following table presents the effect of our derivative financial instruments and our share of our joint ventures' derivative financial instruments that are designated and qualify as hedging instruments on the consolidated statements of operations for the six months ended June 30, 2016 and 2015, respectively (in thousands):



	Amount of (Loss) Gain Recognized in Other Comprehensive Loss (Effective Portion)						Location of (Loss) Reclassified from Accumulated Other Comprehensive Loss into Income	Amount of Loss Reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion)				Location of (Loss) or Gain Recognized in Income on Derivative	Amount of (Loss) or Gain Recognized into Income (Ineffective Portion)
	Six Months Ended June 30,							Six Months Ended June 30,					Six Months Ended June 30,
Derivative	2016			2015				2016		2015			2016			2015
Interest Rate Swaps/Caps	$	(8,105	)	$	(8,616	)	Interest expense	$	6,631	$	5,484	Interest expense	$	(38	)	$	(424	)
Share of unconsolidated joint ventures' derivative instruments	(5,770		)	(960		)	Equity in net income from unconsolidated joint ventures	918		662		Equity in net income from unconsolidated joint ventures	(1,036		)	—
	$	(13,875	)	$	(9,576	)		$	7,549	$	6,146		$	(1,074	)	$	(424	)

- Definition

Tabular disclosure of pertinent information about a derivative or group of derivatives on a disaggregated basis, such as for individual instruments, or small groups of similar instruments. May include a combination of the type of instrument, risks being hedged, notional amount, hedge designation, related hedged item, inception date, maturity date, or other relevant item.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=64837297&loc=d3e41641-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624163-113959

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64837297&loc=d3e41678-113959

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=64837297&loc=d3e41638-113959

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5580258-113959

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5579245-113959

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5579240-113959

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64837297&loc=d3e41620-113959

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(n)(2))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

Commitments and Contingencies (Tables)

6 Months Ended

Jun. 30, 2016

Commitments and Contingencies Disclosure [Abstract]

Schedule of Future Minimum Rental Payments for Operating Leases

The following is a schedule of future minimum lease payments under capital leases and non-cancellable operating leases with initial terms in excess of one year as of June 30, 2016 (in thousands):



	Capital lease			Non-cancellable operating leases
Remaining 2016	$	1,145		$	15,468
2017	2,387			31,049
2018	2,387			31,049
2019	2,411			31,066
2020	2,620			31,436
Thereafter	825,483			764,353
Total minimum lease payments	$	836,433		$	904,421
Amount representing interest	(794,682		)
Capital lease obligations	$	41,751

Schedule of Future Minimum Lease Payments for Capital Leases

The following is a schedule of future minimum lease payments under capital leases and non-cancellable operating leases with initial terms in excess of one year as of June 30, 2016 (in thousands):



	Capital lease			Non-cancellable operating leases
Remaining 2016	$	1,145		$	15,468
2017	2,387			31,049
2018	2,387			31,049
2019	2,411			31,066
2020	2,620			31,436
Thereafter	825,483			764,353
Total minimum lease payments	$	836,433		$	904,421
Amount representing interest	(794,682		)
Capital lease obligations	$	41,751

Segment Information (Tables)

6 Months Ended

Jun. 30, 2016

Segment Reporting [Abstract]

Schedule of selected results of operations and selected asset information



	Real Estate Segment			Debt and Preferred Equity Segment		Total Company
Total revenues
Three months ended:
June 30, 2016	$	569,824		$	47,790	$	617,614
June 30, 2015	361,730			47,344		409,074
Six months ended:
June 30, 2016	968,180			104,878		1,073,058
June 30, 2015	713,832			91,541		805,373
(Loss) Income from continuing operations before equity in net gain on sale of interest in unconsolidated joint venture/real estate, gain on sale of real estate, depreciable real estate reserves net of recoveries, and loss on sale of investment in marketable securities
Three months ended:
June 30, 2016	$	(112,337	)	$	41,874	$	(70,463	)
June 30, 2015	(67,807		)	37,859		(29,948		)
Six months ended:
June 30, 2016	(153,270		)	91,622		(61,648		)
June 30, 2015	(63,170		)	75,448		12,278
Total assets
As of:
June 30, 2016	$	15,865,286		$	1,678,937	$	17,544,223
December 31, 2015	18,045,370			1,682,276		19,727,646

Schedule of reconciliation of income from continuing operations to net income attributable to SL Green common stockholders

The table below reconciles income from continuing operations to net income for the three months and six months ended June 30, 2016, and 2015 (in thousands):



	Three Months Ended June 30,						Six Months Ended June 30,
	2016			2015			2016			2015
(Loss) Income from continuing operations before equity in net gain on sale of interest in unconsolidated joint venture/real estate, gain on sale of real estate, depreciable real estate reserves net of recoveries, and loss on sale of investment in marketable securities	$	(70,463	)	$	(29,948	)	$	(61,648	)	$	12,278
Equity in net gain on sale of interest in unconsolidated joint venture/real estate	33,448			769			43,363			769
Gain on sale of real estate, net	196,580			—			210,353			—
Depreciable real estate reserves	(10,387		)	—			(10,387		)	—
Loss on sale of investment in marketable securities	(83		)	—			(83		)	—
Income (loss) from continuing operations	149,095			(29,179		)	181,598			13,047
Net income (loss) from discontinued operations	—			—			—			427
Gain on sale of discontinued operations	—			—			—			12,983
Net income (loss)	$	149,095		$	(29,179	)	$	181,598		$	26,457

Organization and Basis of Presentation (Details) - SL Green Operating Partnership	6 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Organization
Percentage of ownership in SL Green Management LLC owned by operating partnership (percent)	100.00%
Noncontrolling interest in the operating partnership (as a percent)	4.30%	3.61%
Service Corporation
Organization
Economic interest in variable interest entity (as a percent)	95.00%

Significant Accounting Policies (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Principles of Consolidation
Commercial real estate properties	$ 12,788,076	$ 14,620,896
Mortgages and other loans payable, net	5,524,110	6,881,920
Consolidated VIEs
Principles of Consolidation
Commercial real estate properties	1,500,000	200,700
Mortgages and other loans payable, net	$ 594,600	$ 101,100

Significant Accounting Policies (Investments in Commercial Real Estate Properties)(Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Investment in Commercial Real Estate Properties
Depreciable real estate reserves	$ (10,387)	$ 0	$ (10,387)	$ 0
Rental revenue from amortization of acquired leases	156,800	8,300	191,600	22,600
Reduction in interest expense from amortization of above-market rate mortgages	700	$ 600	1,300	$ 1,200
Identified intangible assets (included in other assets):
Gross amount	1,022,430		1,022,430		$ 939,518
Accumulated amortization	(420,167)		(420,167)		(403,747)
Net	602,263		602,263		535,771
Identified intangible liabilities (included in deferred revenue):
Gross amount	861,539		861,539		866,561
Accumulated amortization	(498,992)		(498,992)		(486,928)
Net	362,547		362,547		379,633
Net intangible assets reclassed to assets held for sale	100		100		100
Net intangible liabilities reclassed to liabilities relates to assets held for sale	200		$ 200		$ 100
Minimum \| Above-market leases
Investment in Commercial Real Estate Properties
Estimated useful life of other intangible assets (in years)			1 year
Minimum \| Below-market leases
Investment in Commercial Real Estate Properties
Estimated useful life of other intangible assets (in years)			1 year
Minimum \| In-place leases
Investment in Commercial Real Estate Properties
Estimated useful life of other intangible assets (in years)			1 year
Maximum \| Above-market leases
Investment in Commercial Real Estate Properties
Estimated useful life of other intangible assets (in years)			14 years
Maximum \| Below-market leases
Investment in Commercial Real Estate Properties
Estimated useful life of other intangible assets (in years)			14 years
Maximum \| In-place leases
Investment in Commercial Real Estate Properties
Estimated useful life of other intangible assets (in years)			14 years
Building \| Minimum
Investment in Commercial Real Estate Properties
Estimated useful life (in years)			3 years
Building \| Maximum
Investment in Commercial Real Estate Properties
Estimated useful life (in years)			40 years
500 West Putnam Avenue
Investment in Commercial Real Estate Properties
Depreciable real estate reserves			$ 10,400
388-390 Greenwich Street
Investment in Commercial Real Estate Properties
Rental revenue from amortization of acquired leases	$ 149,900		$ 172,400

Significant Accounting Policies (Investment in Marketable Securities)(Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Investment in Marketable Securities
Marketable securities	$ 39,339		$ 39,339		$ 45,138
Cost basis	37,800		37,800		38,700
Proceeds from sale of marketable securities	4,300	$ 200	4,300	$ 300
Fair Value
Investment in Marketable Securities
Marketable securities	39,339		39,339		45,138
Equity marketable securities
Investment in Marketable Securities
Marketable securities	334		334		4,704
Commercial mortgage-backed securities
Investment in Marketable Securities
Marketable securities	$ 39,005		$ 39,005		$ 40,434

Significant Accounting Policies (Revenue Recognition/Income Taxes)(Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Accounting Policies [Abstract]
Days past due for income recognition on debt and preferred equity investments to be suspended			90 days
Income taxes
Federal, state and local tax provision	$ 0.3	$ 1.1	$ 1.5	$ 1.4

Significant Accounting Policies (Concentrations of Credit Risk/Accounting Standards Updates)(Details) $ in Millions	6 Months Ended
	Jun. 30, 2016 USD ($) Tenant	Dec. 31, 2015 USD ($)
Concentration of Credit Risk
Deferred debt issuance costs \| $	$ 101.5	$ 130.3
Annualized rent \| Customer concentration
Concentration of Credit Risk
Number of tenants (tenants) \| Tenant	2
Maximum percentage of annualized rent for any one tenant not individually disclosed (percent) (more than)	5.00%
Annualized rent \| 11 Madison Avenue \| Customer concentration
Concentration of Credit Risk
Percentage of concentration (percent)	10.00%
Annualized rent \| 1515 Broadway \| Customer concentration
Concentration of Credit Risk
Percentage of concentration (percent)	9.30%
Annualized rent \| 919 Third Avenue \| Customer concentration
Concentration of Credit Risk
Percentage of concentration (percent)	7.20%
Annualized rent \| 1185 Avenue of the Americas \| Customer concentration
Concentration of Credit Risk
Percentage of concentration (percent)	6.70%
Annualized rent \| 420 Lexington Avenue \| Customer concentration
Concentration of Credit Risk
Percentage of concentration (percent)	5.90%
Annualized rent \| 1 Madison Ave \| Customer concentration
Concentration of Credit Risk
Percentage of concentration (percent)	5.10%
Tenant 1 \| Annualized rent \| Customer concentration
Concentration of Credit Risk
Percentage of concentration (percent)	9.10%
Tenant 2 \| Annualized rent \| Customer concentration
Concentration of Credit Risk
Percentage of concentration (percent)	6.40%

Property Acquisitions (Details) - USD ($) $ in Thousands	1 Months Ended				3 Months Ended		6 Months Ended
Property Acquisitions (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Aug. 31, 2015	Jun. 30, 2015	Mar. 31, 2015	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Recognized Identifiable Assets Acquired and Liabilities Assumed
Impact to rental revenue for amortization of aggregate below-market leases					$ 416,809	$ 304,226	$ 762,416	$ 607,555
Impact to depreciation expense					$ 425,042	199,565	604,350	307,902
183 Broadway
Recognized Identifiable Assets Acquired and Liabilities Assumed
Land	$ 26,640
Building and building leasehold	2,960
Above market lease value	0
Acquired in-place leases	0
Other assets, net of other liabilities	0
Assets acquired	29,600
Mark-to-market assumed debt	0
Below market lease value	0
Derivatives	0
Liabilities assumed	0
Purchase price	29,600
Net consideration funded by us at closing, excluding consideration financed by debt	29,600
Equity and/or debt investment held	0
Debt assumed	$ 0
Upper East Side Residential
Recognized Identifiable Assets Acquired and Liabilities Assumed
Land			$ 48,152			48,152		48,152
Building and building leasehold			0			0		0
Above market lease value			0			0		0
Acquired in-place leases			1,922			1,922		1,922
Other assets, net of other liabilities			0			0		0
Assets acquired			50,074			50,074		50,074
Mark-to-market assumed debt			0			0		0
Below market lease value			0			0		0
Derivatives			0			0		0
Liabilities assumed			0			0		0
Purchase price			50,074			50,074		50,074
Net consideration funded by us at closing, excluding consideration financed by debt			0
Equity and/or debt investment held			0
Debt assumed			0
Upper East Side Residential \| As Previously Reported
Recognized Identifiable Assets Acquired and Liabilities Assumed
Land			17,500			17,500		17,500
Building and building leasehold			$ 32,500			$ 32,500		$ 32,500
11 Madison Avenue
Recognized Identifiable Assets Acquired and Liabilities Assumed
Land		$ 675,776
Building and building leasehold		1,553,602
Above market lease value		19,764
Acquired in-place leases		366,949
Other assets, net of other liabilities		0
Assets acquired		2,616,091
Mark-to-market assumed debt		0
Below market lease value		(187,732)
Derivatives		0
Liabilities assumed		(187,732)
Purchase price		2,428,359
Net consideration funded by us at closing, excluding consideration financed by debt		0
Equity and/or debt investment held		0
Debt assumed		0
11 Madison Avenue \| As Previously Reported
Recognized Identifiable Assets Acquired and Liabilities Assumed
Land		849,900
Building and building leasehold		$ 1,600,000
1640 Flatbush Avenue
Recognized Identifiable Assets Acquired and Liabilities Assumed
Land				$ 6,226
Building and building leasehold				501
Above market lease value				0
Acquired in-place leases				146
Other assets, net of other liabilities				0
Assets acquired				6,873
Mark-to-market assumed debt				0
Below market lease value				(73)
Derivatives				0
Liabilities assumed				(73)
Purchase price				6,800
Net consideration funded by us at closing, excluding consideration financed by debt				0
Equity and/or debt investment held				0
Debt assumed				0
1640 Flatbush Avenue \| As Previously Reported
Recognized Identifiable Assets Acquired and Liabilities Assumed
Land				6,100
Building and building leasehold				$ 700
Upper East Side Residential, 11 Madison Avenue and 1640 Flatbush Avenue
Recognized Identifiable Assets Acquired and Liabilities Assumed
Impact to rental revenue for amortization of aggregate below-market leases							6,000
Impact to depreciation expense							$ 14,500

Properties Held for Sale and Property Dispositions (Properties Held for Sale) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Property Dispositions and Assets Held for Sale
Depreciable real estate reserves	$ (10,387)	$ 0	$ (10,387)	$ 0
500 West Putnam Avenue
Property Dispositions and Assets Held for Sale
Agreed sale consideration	41,000
Depreciable real estate reserves	$ 10,400

Properties Held for Sale and Property Dispositions (Property Dispositions) (Details) $ in Thousands	1 Months Ended				3 Months Ended		6 Months Ended
	Jun. 30, 2016 USD ($) ft²	May 31, 2016 USD ($) a	Feb. 29, 2016 USD ($) ft²	Dec. 31, 2015 USD ($)	Jun. 30, 2016 USD ($) ft²	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($) ft²	Jun. 30, 2015 USD ($)
Properties Sold [Abstract]
Approximate Square Feet (sqft/acres) \| ft²	33,018,905				33,018,905		33,018,905
Gain on Sale					$ 0	$ 0	$ 0	$ 12,983
Employee compensation award							1,100
Revenues
Rental revenue								236
Escalation and reimbursement revenues								(127)
Other income								0
Total revenues								109
Operating expenses								(631)
Real estate taxes								250
Ground rent								0
Transaction related costs								(49)
Depreciable real estate reserves								109
Interest expense, net of interest income								3
Amortization of deferred financing costs								0
Total expenses								(318)
Net income from discontinued operations					$ 0	$ 0	$ 0	$ 427
248-252 Bedford Avenue
Properties Sold [Abstract]
Approximate Square Feet (sqft/acres) \| ft²			66,611
Sales Price			$ 55,000
Gain on Sale			15,300
Employee compensation award			$ 1,300
885 Third Avenue
Properties Sold [Abstract]
Approximate Square Feet (sqft/acres) \| ft²			607,000
Sales Price			$ 453,000
Gain on Sale			$ 0	$ (6,600)
7 International Drive
Properties Sold [Abstract]
Approximate Square Feet (sqft/acres) \| a		31
Sales Price		$ 20,000
Gain on Sale		$ (6,900)
388 Greenwich
Properties Sold [Abstract]
Approximate Square Feet (sqft/acres) \| ft²	2,635,000				2,635,000		2,635,000
Sales Price	$ 2,002,300
Gain on Sale	206,500
Employee compensation award	$ 1,600

Debt and Preferred Equity Investments (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Apr. 30, 2016	Dec. 31, 2015	Sep. 30, 2014	Jul. 31, 2014
Debt investment
Increase in debt and preferred equity investments (net of discounts), including investments classified as held-for-sale	$ 255,000	$ 386,200
Decrease in debt and preferred equity investments (net of discounts), including investments classified as held-for-sale	$ 567,900	$ 109,800
Aggregate weighted average current yield (as a percent)	9.55%
Debt Investments Held [Abstract]
Carrying Value, Net of Discounts and Deferred Origination Fees	$ 1,357,181			$ 1,670,020
Debt investment
Debt Investments Held [Abstract]
Future Funding Obligations	105,715
Senior Financing	4,056,677
Carrying Value, Net of Discounts and Deferred Origination Fees	1,314,145			1,627,844
Mezzanine Loan, June 2017
Debt Investments Held [Abstract]
Amount participated out	41,300
Mezzanine Loan, November 2023
Debt Investments Held [Abstract]
Amount participated out	5,000
Mezzanine Loan, June 2024
Debt Investments Held [Abstract]
Amount participated out	12,000
Mezzanine Loan Repaid in April 2016
Debt Investments Held [Abstract]
Carrying Value, Net of Discounts and Deferred Origination Fees						$ 50,000
Purchase option, percentage of underlying asset			20.00%
Mortgage/Mezzanine Loan, January 2017
Debt Investments Held [Abstract]
Amount participated out	36,300
Mezzanine Loan, June 2017
Debt Investments Held [Abstract]
Amount participated out	14,500
Mezzanine Loan, December 2017
Debt Investments Held [Abstract]
Amount participated out	14,600
Mezzanine Loan, December 2017
Debt Investments Held [Abstract]
Amount participated out	14,100
Mortgage/Mezzanine Loan, December 2017
Debt Investments Held [Abstract]
Amount participated out	5,100
Junior Mortgage Participation/Mezzanine Loan, July 2018
Debt Investments Held [Abstract]
Amount participated out	10,000
Total fixed rate
Debt Investments Held [Abstract]
Future Funding Obligations	10,000
Senior Financing	2,090,627
Carrying Value, Net of Discounts and Deferred Origination Fees	410,730			511,389
Total fixed rate \| Mezzanine Loan, October 2016
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	165,000
Carrying Value, Net of Discounts and Deferred Origination Fees	72,271			72,102
Total fixed rate \| Junior Mortgage Participation/Mezzanine Loan, March 2017
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	1,109,000
Carrying Value, Net of Discounts and Deferred Origination Fees	189,380			104,661
Total fixed rate \| Mezzanine Loan, June 2017
Debt Investments Held [Abstract]
Future Funding Obligations	10,000
Senior Financing	502,100
Carrying Value, Net of Discounts and Deferred Origination Fees	55,988			41,115
Total fixed rate \| Mortgage Loan, February 2019
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	0
Carrying Value, Net of Discounts and Deferred Origination Fees	26,284			26,262
Loan acquired					$ 26,400
Discount amount					200
Total fixed rate \| Mortgage Loan, August 2019
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	0
Carrying Value, Net of Discounts and Deferred Origination Fees	447			513
Total fixed rate \| Mezzanine Loan, September 2021
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	15,000
Carrying Value, Net of Discounts and Deferred Origination Fees	3,500			3,500
Total fixed rate \| Mezzanine Loan, November 2023
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	89,527
Carrying Value, Net of Discounts and Deferred Origination Fees	19,939			19,936
Total fixed rate \| Mezzanine Loan, June 2024
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	115,000
Carrying Value, Net of Discounts and Deferred Origination Fees	12,921			24,916
Total fixed rate \| Mezzanine Loan, January 2025
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	95,000
Carrying Value, Net of Discounts and Deferred Origination Fees	30,000			30,000
Total fixed rate \| Mezzanine Loan Repaid in April 2016
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	0
Carrying Value, Net of Discounts and Deferred Origination Fees	0			49,691
Total fixed rate \| Junior Mortgage Participation Loan Repaid in March 2016
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	0
Carrying Value, Net of Discounts and Deferred Origination Fees	0			49,000
Total fixed rate \| Loan Collateralized by Defeasance Securities Repaid in March 2016
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	0
Carrying Value, Net of Discounts and Deferred Origination Fees	0			23,510
Total fixed rate \| Loan Collateralized by Defeasance Securities Repaid in March 2016
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	0
Carrying Value, Net of Discounts and Deferred Origination Fees	0			66,183
Total fixed rate \| Junior Mortgage Participation, Related To Mortgage Loan, February 2019
Debt Investments Held [Abstract]
Loan acquired					5,700
Discount amount					$ 5,700
Total floating rate
Debt Investments Held [Abstract]
Future Funding Obligations	95,715
Senior Financing	1,966,050
Carrying Value, Net of Discounts and Deferred Origination Fees	903,415			1,116,455
Total floating rate \| Mortgage/Mezzanine Loan, October 2016
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	0
Carrying Value, Net of Discounts and Deferred Origination Fees	105,278			94,901
Total floating rate \| Mezzanine Loan, November 2016
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	360,000
Carrying Value, Net of Discounts and Deferred Origination Fees	99,811			99,530
Total floating rate \| Mezzanine Loan, December 2016
Debt Investments Held [Abstract]
Future Funding Obligations	8,459
Senior Financing	136,384
Carrying Value, Net of Discounts and Deferred Origination Fees	52,827			49,751
Total floating rate \| Mezzanine Loan, December 2016
Debt Investments Held [Abstract]
Future Funding Obligations	281
Senior Financing	39,201
Carrying Value, Net of Discounts and Deferred Origination Fees	13,761			13,731
Total floating rate \| Mortgage/Mezzanine Loan, January 2017
Debt Investments Held [Abstract]
Future Funding Obligations	43,572
Senior Financing	0
Carrying Value, Net of Discounts and Deferred Origination Fees	137,150			134,264
Total floating rate \| Mezzanine Loan, January 2017
Debt Investments Held [Abstract]
Future Funding Obligations	1,127
Senior Financing	118,949
Carrying Value, Net of Discounts and Deferred Origination Fees	28,796			28,551
Total floating rate \| Mezzanine Loan, June 2017
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	40,000
Carrying Value, Net of Discounts and Deferred Origination Fees	15,212			68,977
Total floating rate \| Mortgage/Mezzanine Loan, June 2017
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	0
Carrying Value, Net of Discounts and Deferred Origination Fees	32,679			0
Total floating rate \| Mortgage/Mezzanine Loan, July 2017
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	0
Carrying Value, Net of Discounts and Deferred Origination Fees	22,919			22,877
Total floating rate \| Mortgage/Mezzanine Loan, September 2017
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	0
Carrying Value, Net of Discounts and Deferred Origination Fees	16,931			16,901
Total floating rate \| Mortgage/Mezzanine Loan, October 2017
Debt Investments Held [Abstract]
Future Funding Obligations	4,234
Senior Financing	0
Carrying Value, Net of Discounts and Deferred Origination Fees	19,607			19,282
Total floating rate \| Mezzanine Loan, November 2017
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	60,000
Carrying Value, Net of Discounts and Deferred Origination Fees	14,931			14,904
Total floating rate \| Mezzanine Loan, December 2017
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	85,000
Carrying Value, Net of Discounts and Deferred Origination Fees	15,011			29,505
Total floating rate \| Mezzanine Loan, December 2017
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	65,000
Carrying Value, Net of Discounts and Deferred Origination Fees	14,542			28,563
Total floating rate \| Mortgage/Mezzanine Loan, December 2017
Debt Investments Held [Abstract]
Future Funding Obligations	795
Senior Financing	0
Carrying Value, Net of Discounts and Deferred Origination Fees	14,998			14,942
Total floating rate \| Junior Participation Loan, April 2018
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	40,000
Carrying Value, Net of Discounts and Deferred Origination Fees	19,880			19,846
Total floating rate \| Mezzanine Loan, April 2018
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	175,000
Carrying Value, Net of Discounts and Deferred Origination Fees	34,785			34,725
Total floating rate \| Junior Mortgage Participation/Mezzanine Loan, July 2018
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	55,000
Carrying Value, Net of Discounts and Deferred Origination Fees	10,512			20,510
Total floating rate \| Mortgage/Mezzanine Loan, August 2018
Debt Investments Held [Abstract]
Future Funding Obligations	523
Senior Financing	20,523
Carrying Value, Net of Discounts and Deferred Origination Fees	10,829			31,210
Total floating rate \| Mezzanine Loan, October 2018
Debt Investments Held [Abstract]
Future Funding Obligations	2,325
Senior Financing	45,025
Carrying Value, Net of Discounts and Deferred Origination Fees	34,318			0
Total floating rate \| Mezzanine Loan, December 2018
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	33,000
Carrying Value, Net of Discounts and Deferred Origination Fees	26,812			26,777
Total floating rate \| Mezzanine Loan, December 2018
Debt Investments Held [Abstract]
Future Funding Obligations	4,560
Senior Financing	156,383
Carrying Value, Net of Discounts and Deferred Origination Fees	54,731			52,774
Total floating rate \| Mezzanine Loan, December 2018
Debt Investments Held [Abstract]
Future Funding Obligations	23,456
Senior Financing	217,202
Carrying Value, Net of Discounts and Deferred Origination Fees	55,217			49,625
Total floating rate \| Mezzanine Loan, January 2019
Debt Investments Held [Abstract]
Future Funding Obligations	6,383
Senior Financing	16,383
Carrying Value, Net of Discounts and Deferred Origination Fees	5,363			0
Total floating rate \| Mezzanine Loan, March 2019
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	38,000
Carrying Value, Net of Discounts and Deferred Origination Fees	21,869			21,845
Total floating rate \| Mezzanine Loan, April 2019
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	265,000
Carrying Value, Net of Discounts and Deferred Origination Fees	24,646			0
Total floating rate \| Mezzanine Loan Repaid in June 2016
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	0
Carrying Value, Net of Discounts and Deferred Origination Fees	0			22,625
Total floating rate \| Mezzanine Loan Repaid in May 2016
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	0
Carrying Value, Net of Discounts and Deferred Origination Fees	0			74,700
Total floating rate \| Mezzanine Loan Contributed for a Joint Venture Interest
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	0
Carrying Value, Net of Discounts and Deferred Origination Fees	0			66,398
Total floating rate \| Jr Mortgage Participation/Mezzanine Loan Repaid in March 2016
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	0
Carrying Value, Net of Discounts and Deferred Origination Fees	0			18,395
Total floating rate \| Mezzanine Loan Repaid in February 2016
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	0
Carrying Value, Net of Discounts and Deferred Origination Fees	$ 0			$ 40,346

Debt and Preferred Equity Investments (Preferred Equity Investments)(Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Preferred equity investment
Aggregate weighted average current yield (as a percent)	9.55%
Carrying Value, Net of Discounts and Deferred Origination Fees	$ 1,357,181	$ 1,670,020
Preferred Equity, March 2018
Preferred equity investment
Future Funding Obligations	0
Senior Financing	71,486
Carrying Value, Net of Discounts and Deferred Origination Fees	9,974	9,967
Preferred Equity, November 2018
Preferred equity investment
Future Funding Obligations	4,779
Senior Financing	59,966
Carrying Value, Net of Discounts and Deferred Origination Fees	$ 33,062	32,209
Preferred equity investments
Preferred equity investment
Aggregate weighted average current yield (as a percent)	7.97%
Future Funding Obligations	$ 4,779
Senior Financing	131,452
Carrying Value, Net of Discounts and Deferred Origination Fees	$ 43,036	$ 42,176

Debt and Preferred Equity Investments (Narrative)(Details)	6 Months Ended	12 Months Ended
	Jun. 30, 2016 USD ($) segment	Dec. 31, 2015 USD ($) segment	Jun. 30, 2015 USD ($)
Preferred equity investment
Carrying Value, Net of Discounts and Deferred Origination Fees	$ 1,357,181,000	$ 1,670,020,000
Number of portfolio segments of financial receivables (segment) \| segment	1	1
Additional amount of financing receivables included in other assets	$ 119,300,000		$ 121,500,000
Junior Mortgage Participation Acquired in September 2014
Preferred equity investment
Carrying Value, Net of Discounts and Deferred Origination Fees	$ 0	$ 0

Investments in Unconsolidated Joint Ventures (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2016 USD ($) ft² unit note	Apr. 30, 2016	Dec. 31, 2015 USD ($)	Jul. 31, 2014 USD ($)
General information on each joint venture
Net equity investment in VIEs in which the entity is not primary beneficiary \| $	$ 216,900		$ 39,700
Approximate Square Feet (sqft)	33,018,905
Mezzanine Loan Repaid in April 2016
General information on each joint venture
Ownership Interest (as a percent)		20.00%
Mezzanine loan \| $				$ 50,000
100 Park Avenue
General information on each joint venture
Ownership Interest (as a percent)	49.90%
Economic Interest (as a percent)	49.90%
Approximate Square Feet (sqft)	834,000
Acquisition Price \| $	$ 95,800
717 Fifth Avenue
General information on each joint venture
Ownership Interest (as a percent)	10.92%
Economic Interest (as a percent)	10.92%
Approximate Square Feet (sqft)	119,500
Acquisition Price \| $	$ 251,900
800 Third Avenue
General information on each joint venture
Ownership Interest (as a percent)	60.52%
Economic Interest (as a percent)	60.52%
Approximate Square Feet (sqft)	526,000
Acquisition Price \| $	$ 285,000
1745 Broadway
General information on each joint venture
Ownership Interest (as a percent)	56.88%
Economic Interest (as a percent)	56.88%
Approximate Square Feet (sqft)	674,000
Acquisition Price \| $	$ 520,000
Jericho Plaza
General information on each joint venture
Ownership Interest (as a percent)	11.67%		77.78%
Economic Interest (as a percent)	11.67%
Approximate Square Feet (sqft)	640,000
Acquisition Price \| $	$ 210,000
11 West 34th Street
General information on each joint venture
Ownership Interest (as a percent)	30.00%
Economic Interest (as a percent)	30.00%
Approximate Square Feet (sqft)	17,150
Acquisition Price \| $	$ 10,800
3 Columbus Circle
General information on each joint venture
Ownership Interest (as a percent)	48.90%
Economic Interest (as a percent)	48.90%
Approximate Square Feet (sqft)	741,500
Acquisition Price \| $	$ 500,000
280 Park Avenue
General information on each joint venture
Ownership Interest (as a percent)	50.00%
Economic Interest (as a percent)	50.00%
Approximate Square Feet (sqft)	1,219,158
Acquisition Price \| $	$ 400,000
1552-1560 Broadway
General information on each joint venture
Ownership Interest (as a percent)	50.00%
Economic Interest (as a percent)	50.00%
Approximate Square Feet (sqft)	35,897
Acquisition Price \| $	$ 136,550
724 Fifth Avenue
General information on each joint venture
Ownership Interest (as a percent)	50.00%
Economic Interest (as a percent)	50.00%
Approximate Square Feet (sqft)	65,040
Acquisition Price \| $	$ 223,000
10 East 53rd Street
General information on each joint venture
Ownership Interest (as a percent)	55.00%
Economic Interest (as a percent)	55.00%
Approximate Square Feet (sqft)	354,300
Acquisition Price \| $	$ 252,500
521 Fifth Avenue
General information on each joint venture
Ownership Interest (as a percent)	50.50%
Economic Interest (as a percent)	50.50%
Approximate Square Feet (sqft)	460,000
Acquisition Price \| $	$ 315,000
21 East 66th Street
General information on each joint venture
Ownership Interest (as a percent)	32.28%
Economic Interest (as a percent)	32.28%
Approximate Square Feet (sqft)	16,736
Acquisition Price \| $	$ 75,000
21 East 66th Street \| Three Retail and Two Residential Units
General information on each joint venture
Ownership Interest (as a percent)	32.28%
Number of Stores \| unit	3
Number Of Residential Units \| unit	2
21 East 66th Street \| Three Residential Units
General information on each joint venture
Ownership Interest (as a percent)	16.14%
Number Of Residential Units \| unit	3
650 Fifth Avenue
General information on each joint venture
Ownership Interest (as a percent)	50.00%
Economic Interest (as a percent)	50.00%
Approximate Square Feet (sqft)	32,324
121 Greene Street
General information on each joint venture
Ownership Interest (as a percent)	50.00%
Economic Interest (as a percent)	50.00%
Approximate Square Feet (sqft)	7,131
Acquisition Price \| $	$ 27,400
175-225 Third Street Brooklyn, New York
General information on each joint venture
Ownership Interest (as a percent)	95.00%
Economic Interest (as a percent)	95.00%
Approximate Square Feet (sqft)	0
Acquisition Price \| $	$ 74,600
55 West 46th Street
General information on each joint venture
Ownership Interest (as a percent)	25.00%
Economic Interest (as a percent)	25.00%
Approximate Square Feet (sqft)	347,000
Acquisition Price \| $	$ 295,000
Stonehenge Portfolio
General information on each joint venture
Approximate Square Feet (sqft)	2,046,733
Acquisition Price \| $	$ 36,668
131-137 Spring Street
General information on each joint venture
Ownership Interest (as a percent)	20.00%
Economic Interest (as a percent)	20.00%
Approximate Square Feet (sqft)	68,342
Acquisition Price \| $	$ 277,750
76 11th Avenue
General information on each joint venture
Ownership Interest (as a percent)	33.33%
Economic Interest (as a percent)	36.58%
Approximate Square Feet (sqft)	764,000
Acquisition Price \| $	$ 138,240
Number of mezzanine notes secured by interests in the entity which owns 76 11th avenue \| note	2
Exit fee, percentage owned	50.00%
605 West 42nd Street
General information on each joint venture
Ownership Interest (as a percent)	20.00%
Economic Interest (as a percent)	20.00%
Approximate Square Feet (sqft)	927,358
Acquisition Price \| $	$ 759,000
1552 Broadway
General information on each joint venture
Approximate Square Feet (sqft)	13,045
Partners' Interest \| 76 11th Avenue \| Joint venture
General information on each joint venture
Exit fee, percentage owned	25.00%

Investments in Unconsolidated Joint Ventures (Acquisition, Development and Construction Arrangements/Sale of Joint Venture Interest or Property)(Details) - USD ($) $ in Thousands	1 Months Ended			3 Months Ended		6 Months Ended
	May 31, 2016	Mar. 31, 2016	Feb. 29, 2016	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]
Acquisition, development and construction arrangements, carrying value				$ 145,719		$ 145,719		$ 145,878
Gain on Sale				0	$ 0	0	$ 12,983
Employee compensation award						1,100
1 Jericho Plaza
Schedule of Equity Method Investments [Line Items]
Ownership Percentage		11.67%	66.11%					77.78%
Gross Asset Valuation			$ 95,200
Gain on Sale			$ 3,300
7 Renaissance Square
Schedule of Equity Method Investments [Line Items]
Ownership Percentage		50.00%
Gross Asset Valuation		$ 20,700
Gain on Sale		$ 4,200
EOP Denver
Schedule of Equity Method Investments [Line Items]
Ownership Percentage		4.79%
Gross Asset Valuation		$ 180,700
Gain on Sale		$ 2,800
33 Beekman
Schedule of Equity Method Investments [Line Items]
Ownership Percentage	45.90%
Gross Asset Valuation	$ 196,000
Gain on Sale	33,000
Promote recognized	$ 10,800
Mezzanine loan and preferred equity due March 2017
Schedule of Equity Method Investments [Line Items]
Acquisition, development and construction arrangements, carrying value				100,000		100,000		$ 99,936
Mezzanine loan due February 2022
Schedule of Equity Method Investments [Line Items]
Acquisition, development and construction arrangements, carrying value				$ 45,719		$ 45,719		$ 45,942

Investments in Unconsolidated Joint Ventures (Mortgages and Other Loans Payable)(Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Total fixed rate debt	$ 4,975,245	$ 5,816,010
Total floating rate debt	633,155	1,205,494
Total fixed rate and floating rate debt	5,608,400	7,021,504
Deferred financing costs, net	$ (101,500)	(130,300)
1745 Broadway
Debt Instrument [Line Items]
Ownership Percentage	56.88%
521 Fifth Avenue
Debt Instrument [Line Items]
Ownership Percentage	50.50%
717 Fifth Avenue
Debt Instrument [Line Items]
Ownership Percentage	10.92%
21 East 66th Street
Debt Instrument [Line Items]
Ownership Percentage	32.28%
3 Columbus Circle
Debt Instrument [Line Items]
Ownership Percentage	48.90%
800 Third Avenue
Debt Instrument [Line Items]
Ownership Percentage	60.52%
280 Park Avenue
Debt Instrument [Line Items]
Ownership Percentage	50.00%
650 Fifth Avenue
Debt Instrument [Line Items]
Ownership Percentage	50.00%
175-225 Third Street Brooklyn, New York
Debt Instrument [Line Items]
Ownership Percentage	95.00%
10 East 53rd Street
Debt Instrument [Line Items]
Ownership Percentage	55.00%
724 Fifth Avenue
Debt Instrument [Line Items]
Ownership Percentage	50.00%
55 West 46th Street
Debt Instrument [Line Items]
Ownership Percentage	25.00%
605 West 42nd Street
Debt Instrument [Line Items]
Ownership Percentage	20.00%
121 Greene Street
Debt Instrument [Line Items]
Ownership Percentage	50.00%
131-137 Spring Street
Debt Instrument [Line Items]
Ownership Percentage	20.00%
11 West 34th Street
Debt Instrument [Line Items]
Ownership Percentage	30.00%
100 Park Avenue
Debt Instrument [Line Items]
Ownership Percentage	49.90%
Joint venture
Debt Instrument [Line Items]
Total fixed rate debt	$ 2,068,577	2,645,131
Total floating rate debt	2,962,999	1,663,982
Total fixed rate and floating rate debt	5,031,576	4,309,113
Deferred financing costs, net	(109,083)	(42,565)
Total joint venture mortgages and other loans payable, net	4,922,493	4,266,548
Joint venture \| 1745 Broadway
Debt Instrument [Line Items]
Total fixed rate debt	340,000	340,000
Joint venture \| 521 Fifth Avenue
Debt Instrument [Line Items]
Total fixed rate debt	170,000	170,000
Joint venture \| 717 Fifth Avenue \| Mortgage loan
Debt Instrument [Line Items]
Committed amount	300,000
Joint venture \| 717 Fifth Avenue \| Mezzanine loans
Debt Instrument [Line Items]
Committed amount	355,300
Joint venture \| 717 Fifth Avenue \| Initial Maturity July 2022
Debt Instrument [Line Items]
Total fixed rate debt	300,000	300,000
Joint venture \| 717 Fifth Avenue \| Initial Maturity July 2022, 2
Debt Instrument [Line Items]
Total fixed rate debt	355,328	325,704
Joint venture \| 21 East 66th Street
Debt Instrument [Line Items]
Total fixed rate debt	12,000	12,000
Total floating rate debt	1,765	1,805
Joint venture \| 3 Columbus Circle
Debt Instrument [Line Items]
Total fixed rate debt	350,000	350,000
Joint venture \| 800 Third Avenue
Debt Instrument [Line Items]
Total fixed rate debt	177,000	20,910
Joint venture \| Stonehenge Portfolio
Debt Instrument [Line Items]
Total fixed rate debt	364,249	430,627
Total floating rate debt	65,489	10,500
Joint venture \| Stonehenge Portfolio \| Initial Maturity October 2016
Debt Instrument [Line Items]
Total fixed rate debt	13,200
Joint venture \| Stonehenge Portfolio \| Initial Maturity November 2017
Debt Instrument [Line Items]
Total fixed rate debt	34,600
Joint venture \| Stonehenge Portfolio \| Initial Maturity August 2019
Debt Instrument [Line Items]
Total fixed rate debt	140,300
Joint venture \| Stonehenge Portfolio \| Initial Maturity June 2024
Debt Instrument [Line Items]
Total fixed rate debt	176,200
Joint venture \| Stonehenge Portfolio \| Initial Maturity June 2017
Debt Instrument [Line Items]
Total floating rate debt	55,200
Joint venture \| Stonehenge Portfolio \| Initial Maturity December 2017
Debt Instrument [Line Items]
Total floating rate debt	10,300
Joint venture \| 280 Park Avenue
Debt Instrument [Line Items]
Total fixed rate debt	0	692,963
Total floating rate debt	900,000	30,000
Joint venture \| 7 Renaissance Square
Debt Instrument [Line Items]
Total fixed rate debt	0	2,927
Joint venture \| 650 Fifth Avenue
Debt Instrument [Line Items]
Total floating rate debt	65,000	65,000
Joint venture \| 650 Fifth Avenue \| Mortgage loan
Debt Instrument [Line Items]
Committed amount	97,000
Unfunded amount	32,000
Joint venture \| 175-225 Third Street Brooklyn, New York
Debt Instrument [Line Items]
Total floating rate debt	40,000	40,000
Joint venture \| 10 East 53rd Street
Debt Instrument [Line Items]
Total floating rate debt	125,000	125,000
Joint venture \| 724 Fifth Avenue
Debt Instrument [Line Items]
Total floating rate debt	275,000	275,000
Joint venture \| 1552 Broadway
Debt Instrument [Line Items]
Total floating rate debt	185,410	190,409
Joint venture \| 1552 Broadway \| Mortgage loan
Debt Instrument [Line Items]
Committed amount	145,000
Unfunded amount	600
Joint venture \| 1552 Broadway \| Mezzanine loans
Debt Instrument [Line Items]
Committed amount	41,500
Unfunded amount	500
Joint venture \| 55 West 46th Street
Debt Instrument [Line Items]
Total floating rate debt	151,536	150,000
Joint venture \| 55 West 46th Street \| Mortgage loan
Debt Instrument [Line Items]
Committed amount	190,000
Unfunded amount	38,500
Joint venture \| Jericho Plaza
Debt Instrument [Line Items]
Total floating rate debt	$ 75,799	163,750
Ownership Percentage	11.67%
Term (in Years)	2 years
Face amount of loan	$ 100,000
Joint venture \| 605 West 42nd Street
Debt Instrument [Line Items]
Total floating rate debt	539,000	0
Joint venture \| 121 Greene Street
Debt Instrument [Line Items]
Total floating rate debt	15,000	15,000
Joint venture \| 131-137 Spring Street
Debt Instrument [Line Items]
Total floating rate debt	141,000	141,000
Joint venture \| 11 West 34th Street
Debt Instrument [Line Items]
Total floating rate debt	23,000	23,000
Joint venture \| 100 Park Avenue
Debt Instrument [Line Items]
Total floating rate debt	360,000	360,000
Joint venture \| 33 Beekman
Debt Instrument [Line Items]
Total floating rate debt	$ 0	$ 73,518
Weighted Average \| Joint venture \| 1745 Broadway
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	5.68%
Weighted Average \| Joint venture \| 521 Fifth Avenue
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	3.73%
Weighted Average \| Joint venture \| 717 Fifth Avenue \| Initial Maturity July 2022
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	4.45%
Weighted Average \| Joint venture \| 717 Fifth Avenue \| Initial Maturity July 2022, 2
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	6.27%
Weighted Average \| Joint venture \| 21 East 66th Street
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	3.60%
Interest rate, floating rate debt (as a percent)	2.00%
Weighted Average \| Joint venture \| 3 Columbus Circle
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	3.61%
Weighted Average \| Joint venture \| 800 Third Avenue
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	3.17%
Weighted Average \| Joint venture \| Stonehenge Portfolio
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	4.19%
Interest rate, floating rate debt (as a percent)	5.81%
Weighted Average \| Joint venture \| 280 Park Avenue
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)	2.44%
Weighted Average \| Joint venture \| 650 Fifth Avenue
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)	3.94%
Weighted Average \| Joint venture \| 175-225 Third Street Brooklyn, New York
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)	4.50%
Weighted Average \| Joint venture \| 10 East 53rd Street
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)	2.94%
Weighted Average \| Joint venture \| 724 Fifth Avenue
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)	2.86%
Weighted Average \| Joint venture \| 1552 Broadway
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)	4.66%
Weighted Average \| Joint venture \| 55 West 46th Street
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)	2.74%
Weighted Average \| Joint venture \| Jericho Plaza
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)	4.59%
Weighted Average \| Joint venture \| 605 West 42nd Street
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)	2.56%
Weighted Average \| Joint venture \| 121 Greene Street
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)	1.94%
Weighted Average \| Joint venture \| 131-137 Spring Street
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)	1.99%
Weighted Average \| Joint venture \| 11 West 34th Street
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)	1.89%
Weighted Average \| Joint venture \| 100 Park Avenue
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)	2.19%

Investments in Unconsolidated Joint Ventures (Schedules of Combined Financial Statements for the Unconsolidated Joint Ventures)(Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Assets
Commercial real estate property, net	$ 12,788,076		$ 12,788,076		$ 14,620,896
Other assets	979,474		979,474		850,939
Liabilities and members' equity
Mortgages and other loans payable, net	5,524,110		5,524,110		6,881,920
Other liabilities	243,011		243,011		168,477
Company's investments in unconsolidated joint ventures	1,126,486		1,126,486		1,203,858
Combined statements of income for the unconsolidated joint ventures
Operating expenses	75,324	$ 70,114	154,844	$ 146,891
Ground rent	8,307	8,086	16,615	16,274
Real estate taxes	62,124	56,286	123,798	112,009
Interest expense, net of interest income	89,089	75,746	183,761	151,553
Amortization of deferred financing costs	7,433	5,952	15,365	12,567
Transaction related costs	2,115	3,067	3,394	4,210
Depreciation and amortization	425,042	199,565	604,350	307,902
Total expenses	693,918	442,016	1,150,643	800,070
Company's equity in net income from unconsolidated joint ventures	5,841	2,994	15,937	7,024
SL Green Operating Partnership
Assets
Commercial real estate property, net	12,788,076		12,788,076		14,620,896
Other assets	979,474		979,474		850,939
Liabilities and members' equity
Mortgages and other loans payable, net	5,524,110		5,524,110		6,881,920
Other liabilities	243,011		243,011		168,477
Company's investments in unconsolidated joint ventures	1,126,486		1,126,486		1,203,858
Combined statements of income for the unconsolidated joint ventures
Operating expenses	75,324	70,114	154,844	146,891
Ground rent	8,307	8,086	16,615	16,274
Real estate taxes	62,124	56,286	123,798	112,009
Interest expense, net of interest income	89,089	75,746	183,761	151,553
Amortization of deferred financing costs	7,433	5,952	15,365	12,567
Transaction related costs	2,115	3,067	3,394	4,210
Depreciation and amortization	425,042	199,565	604,350	307,902
Total expenses	693,918	442,016	1,150,643	800,070
Company's equity in net income from unconsolidated joint ventures	5,841	2,994	15,937	7,024
Joint venture
Investment in Unconsolidated Joint Ventures
Management fees, base revenue	2,000	2,500	2,100	4,900
Assets
Commercial real estate property, net	6,510,775		6,510,775		6,122,468
Debt and preferred equity investments, net	304,901		304,901		145,878
Other assets	741,839		741,839		715,840
Total assets	7,557,515		7,557,515		6,984,186
Liabilities and members' equity
Mortgages and other loans payable, net	4,922,493		4,922,493		4,266,548
Other liabilities	534,611		534,611		523,160
Members' equity	2,100,411		2,100,411		2,194,478
Total liabilities and members' equity	7,557,515		7,557,515		$ 6,984,186
Combined statements of income for the unconsolidated joint ventures
Total revenues	151,575	143,535	314,087	272,451
Operating expenses	27,166	26,345	54,420	51,831
Ground rent	3,715	2,572	6,926	5,164
Real estate taxes	24,332	22,335	48,542	41,711
Interest expense, net of interest income	46,351	51,715	96,087	95,722
Amortization of deferred financing costs	7,276	3,145	10,512	6,155
Transaction related costs	0	3	0	11
Depreciation and amortization	37,294	37,894	75,145	70,878
Total expenses	146,134	144,009	291,632	271,472
Loss on early extinguishment of debt	0	0	(1,606)	(833)
Net income (loss) before gain on sale	5,441	(474)	20,849	146
Company's equity in net income from unconsolidated joint ventures	$ 5,841	$ 2,994	$ 15,937	$ 7,024

Deferred Costs (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Deferred leasing	$ 447,805	$ 415,406
Less: accumulated amortization	(191,502)	(175,486)
Deferred costs, net	$ 256,303	$ 239,920

Mortgages and Other Loans Payable (Details) - USD ($)		1 Months Ended	6 Months Ended
Mortgages and Other Loans Payable (Details) - USD ($)	Dec. 06, 2015	Jul. 31, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Total fixed rate debt			$ 4,975,245,000		$ 5,816,010,000
Total floating rate debt			633,155,000		1,205,494,000
Total fixed rate and floating rate debt			5,608,400,000		7,021,504,000
Mortgages reclassed to liabilities related to assets held for sale			0		(29,000,000)
Total mortgages and other loans payable			5,608,400,000		6,992,504,000
Deferred financing costs, net of amortization			(84,290,000)		(110,584,000)
Total mortgages and other loans payable, net			5,524,110,000		6,881,920,000
Deferred financing costs, net of amortization			101,500,000		130,300,000
Federal Home Loan Bank Advances outstanding			$ 229,000,000
Federal Home Loan Bank, advances, weighted-average borrowing rate (as a percent)			0.90%
Book value of collateral			$ 8,700,000,000		10,800,000,000
Series J Preferred Units
Debt Instrument [Line Items]
Total fixed rate debt			4,000,000		4,000,000
Limited partnership interest			$ 4,000,000
Preferred Units (as a percent)			3.75%
Preferred Units, liquidation preference (in dollars per unit)			$ 1,000.00
Series J Preferred Units \| Weighted Average
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)			3.75%
FHLB Advance Maturing in January 2017
Debt Instrument [Line Items]
Total fixed rate debt			$ 105,000,000		0
FHLB Advance Maturing in January 2017 \| Weighted Average
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)			1.03%
FHLB Advance Maturing in January 2017, 2
Debt Instrument [Line Items]
Total fixed rate debt			$ 100,000,000		0
FHLB Advance Maturing in January 2017, 2 \| Weighted Average
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)			0.80%
Unsecured Loan
Debt Instrument [Line Items]
Total fixed rate debt			$ 16,000,000		16,000,000
Unsecured Loan \| Weighted Average
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)			4.81%
Master Repurchase Agreement
Debt Instrument [Line Items]
Total floating rate debt			$ 134,259,000		253,424,000
Maximum facility capacity			$ 300,000,000.0
Basis Point Fee (as a percent)	0.25%
Threshold amount for basis point fee to be applicable (less than)	$ 150,000,000.0
Master Repurchase Agreement \| Weighted Average
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)			3.59%
Master Repurchase Agreement \| Minimum \| LIBOR
Debt Instrument [Line Items]
Credit facility, interest rate (as a percent)			2.50%
Master Repurchase Agreement \| Maximum \| LIBOR
Debt Instrument [Line Items]
Credit facility, interest rate (as a percent)			3.25%
FHLB Advance Maturing in December 2016
Debt Instrument [Line Items]
Total floating rate debt			$ 24,000,000		45,750,000
FHLB Advance Maturing in December 2016 \| Weighted Average
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)			0.72%
Landmark Square
Debt Instrument [Line Items]
Total fixed rate debt			$ 78,682,000		79,562,000
Landmark Square \| Weighted Average
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)			4.00%
485 Lexington Avenue
Debt Instrument [Line Items]
Total fixed rate debt			$ 450,000,000		450,000,000
485 Lexington Avenue \| Weighted Average
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)			5.61%
762 Madison Avenue
Debt Instrument [Line Items]
Total fixed rate debt			$ 7,784,000		7,872,000
762 Madison Avenue \| Weighted Average
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)			3.86%
885 Third Avenue
Debt Instrument [Line Items]
Total fixed rate debt			$ 267,650,000		267,650,000
885 Third Avenue \| Weighted Average
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)			6.26%
One Madison Avenue
Debt Instrument [Line Items]
Total fixed rate debt			$ 530,876,000		542,817,000
One Madison Avenue \| Weighted Average
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)			5.91%
100 Church Street
Debt Instrument [Line Items]
Total fixed rate debt			$ 223,294,000		225,099,000
100 Church Street \| Weighted Average
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)			4.68%
919 Third Avenue
Debt Instrument [Line Items]
Total fixed rate debt			$ 500,000,000		500,000,000
Interest in property (as a percent)			51.00%
919 Third Avenue \| Weighted Average
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)			5.12%
400 East 57th Street
Debt Instrument [Line Items]
Total fixed rate debt			$ 66,998,000		67,644,000
400 East 57th Street \| Weighted Average
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)			4.13%
400 East 58th Street
Debt Instrument [Line Items]
Total fixed rate debt			$ 28,713,000		28,990,000
400 East 58th Street \| Weighted Average
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)			4.13%
420 Lexington Avenue
Debt Instrument [Line Items]
Total fixed rate debt			$ 300,000,000		300,000,000
420 Lexington Avenue \| Weighted Average
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)			3.99%
1515 Broadway
Debt Instrument [Line Items]
Total fixed rate debt			$ 896,248,000		900,000,000
1515 Broadway \| Weighted Average
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)			3.93%
11 Madison Avenue
Debt Instrument [Line Items]
Total fixed rate debt			$ 1,400,000,000		1,400,000,000
11 Madison Avenue \| Weighted Average
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)			3.84%
388-390 Greenwich Street
Debt Instrument [Line Items]
Total fixed rate debt			$ 0		1,004,000,000
Total floating rate debt			0		446,000,000
Deferred financing costs, net of amortization				$ 24,500,000
500 West Putnam Avenue
Debt Instrument [Line Items]
Total fixed rate debt			0		22,376,000
600 Lexington Avenue
Debt Instrument [Line Items]
Total floating rate debt			$ 110,857,000		112,795,000
600 Lexington Avenue \| Weighted Average
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)			2.63%
719 Seventh Avenue
Debt Instrument [Line Items]
Total floating rate debt			$ 27,514,000		0
719 Seventh Avenue \| Weighted Average
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)			3.49%
183,187 Broadway & 5-7 Dey Street
Debt Instrument [Line Items]
Total floating rate debt			$ 58,000,000		40,000,000
183,187 Broadway & 5-7 Dey Street \| Weighted Average
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)			3.11%
1080 Amsterdam
Debt Instrument [Line Items]
Total floating rate debt			$ 3,525,000		3,525,000
1080 Amsterdam \| Weighted Average
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)			4.19%
220 East 42nd Street
Debt Instrument [Line Items]
Total floating rate debt			$ 275,000,000		275,000,000
220 East 42nd Street \| Weighted Average
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)			2.04%
248-252 Bedford Avenue
Debt Instrument [Line Items]
Total floating rate debt			$ 0		29,000,000
Deferred financing costs, net of amortization					$ 900,000
Subsequent Event \| Master Repurchase Agreement, 2
Debt Instrument [Line Items]
Maximum facility capacity		$ 300,000,000.0
Subsequent Event \| Master Repurchase Agreement, 2 \| Minimum \| LIBOR
Debt Instrument [Line Items]
Credit facility, interest rate (as a percent)		2.25%
Subsequent Event \| Master Repurchase Agreement, 2 \| Maximum \| LIBOR
Debt Instrument [Line Items]
Credit facility, interest rate (as a percent)		4.00%

Corporate Indebtedness (Details) - USD ($)	6 Months Ended
Corporate Indebtedness (Details) - USD ($)	Jun. 30, 2016	Dec. 31, 2015
Corporate Indebtedness
Outstanding under line of credit facility	$ 277,420,000	$ 985,055,000
Long-term debt, carrying value	8,081,574,000
Revolving credit facility
Corporate Indebtedness
Credit facility, maximum borrowing capacity	1,600,000,000.0
Maximum borrowing capacity, optional expansion	$ 3,000,000,000
Effective rate (as a percent)	1.69%
Facility fee (as a percent)	0.25%
Outstanding under line of credit facility	$ 285,000,000
Revolving credit facility \| Minimum
Corporate Indebtedness
Facility fee (as a percent)	0.125%
Revolving credit facility \| Maximum
Corporate Indebtedness
Facility fee (as a percent)	0.30%
Revolving credit facility \| LIBOR
Corporate Indebtedness
Interest rate added to base rate (as a percent)	1.25%
Revolving credit facility \| LIBOR \| Minimum
Corporate Indebtedness
Interest rate added to base rate (as a percent)	0.875%
Revolving credit facility \| LIBOR \| Maximum
Corporate Indebtedness
Interest rate added to base rate (as a percent)	1.55%
Term loan
Corporate Indebtedness
Credit facility, maximum borrowing capacity	$ 933,000,000
Effective rate (as a percent)	1.95%
Long-term debt, carrying value	$ 933,000,000
Term loan \| Line of Credit
Corporate Indebtedness
Long-term debt, carrying value	$ 930,000,000	929,500,000
Term loan \| LIBOR
Corporate Indebtedness
Interest rate added to base rate (as a percent)	1.40%
Term loan \| LIBOR \| Minimum
Corporate Indebtedness
Interest rate added to base rate (as a percent)	0.95%
Term loan \| LIBOR \| Maximum
Corporate Indebtedness
Interest rate added to base rate (as a percent)	1.90%
2012 Credit Facility
Corporate Indebtedness
Letters of credit	$ 73,600,000
Ability to borrow under line of credit facility	1,200,000,000
Long-term debt, carrying value	285,000,000
2012 Credit Facility \| Line of Credit
Corporate Indebtedness
Long-term debt, carrying value	$ 277,400,000	$ 985,100,000

Corporate Indebtedness (Senior Unsecured Notes)(Details)	6 Months Ended
	Jun. 30, 2016 USD ($)	Dec. 31, 2015 USD ($)	Oct. 06, 2010 USD ($) $ / shares	Mar. 20, 2007 $ / shares
Debt disclosures by scheduled maturity date
Accreted Balance	$ 2,060,690,000	$ 2,308,478,000
Deferred financing costs, net	(101,500,000)	(130,300,000)
Senior unsecured notes
Debt disclosures by scheduled maturity date
Unpaid Principal Balance	1,155,008,000
Accreted Balance	1,137,342,000	1,386,244,000
Deferred financing costs, net	(6,652,000)	(7,280,000)
Accreted Balance, Net of Deferred Financing Costs	1,130,690,000	1,378,964,000
Senior unsecured notes \| 3.00% Senior unsecured notes maturing on October 15, 2017
Debt disclosures by scheduled maturity date
Unpaid Principal Balance	345,000,000
Accreted Balance	$ 327,489,000	321,130,000
Coupon Rate (as a percent)	3.00%
Effective rate (as a percent)	3.00%
Term (in Years)	7 years
Premium on sale price to calculate exchange price of notes (as a percent)			30.00%
Exchange price (in dollars per share) \| $ / shares			$ 85.81
Adjusted exchange rate for the debentures (in shares)	12.4998
Principal amount of debentures, basis for conversion	$ 1,000
Amount of convertible debt recorded in equity			$ 78,300,000
Debt Instrument, Unamortized Discount	17,500,000
Senior unsecured notes \| 5.00% Senior unsecured notes maturing on August 15, 2018
Debt disclosures by scheduled maturity date
Unpaid Principal Balance	250,000,000
Accreted Balance	$ 249,845,000	249,810,000
Coupon Rate (as a percent)	5.00%
Effective rate (as a percent)	5.00%
Term (in Years)	7 years
Senior unsecured notes \| 7.75% Senior unsecured notes maturing on March 15, 2020
Debt disclosures by scheduled maturity date
Unpaid Principal Balance	$ 250,000,000
Accreted Balance	$ 250,000,000	250,000,000
Coupon Rate (as a percent)	7.75%
Effective rate (as a percent)	7.75%
Term (in Years)	10 years
Senior unsecured notes \| 4.50% Senior unsecured notes maturing on December 1, 2022
Debt disclosures by scheduled maturity date
Unpaid Principal Balance	$ 200,000,000
Accreted Balance	$ 200,000,000	200,000,000
Coupon Rate (as a percent)	4.50%
Effective rate (as a percent)	4.50%
Term (in Years)	10 years
Senior unsecured notes \| 4.27% Senior unsecured notes maturing on December 17, 2025
Debt disclosures by scheduled maturity date
Unpaid Principal Balance	$ 100,000,000
Accreted Balance	$ 100,000,000	100,000,000
Coupon Rate (as a percent)	4.27%
Effective rate (as a percent)	4.27%
Term (in Years)	10 years
Senior unsecured notes \| 3.00% Senior unsecured notes maturing on March 30, 2027
Debt disclosures by scheduled maturity date
Unpaid Principal Balance	$ 10,008,000
Accreted Balance	$ 10,008,000	10,008,000
Coupon Rate (as a percent)	3.00%
Effective rate (as a percent)	3.00%
Term (in Years)	20 years
Premium on sale price to calculate exchange price of notes (as a percent)				25.00%
Exchange price (in dollars per share) \| $ / shares				$ 173.30
Adjusted exchange rate for the debentures (in shares)	5.7985
Principal amount of debentures, basis for conversion	$ 1,000
Senior unsecured notes \| Senior Unsecured Notes repaid in March 2016
Debt disclosures by scheduled maturity date
Unpaid Principal Balance	0
Accreted Balance	$ 0	$ 255,296,000

Corporate Indebtedness (Junior Subordinated Deferrable Interest Debentures and Principal Maturities)(Details) - USD ($)	1 Months Ended	6 Months Ended
	Jun. 30, 2005	Jun. 30, 2016
Scheduled Amortization and Principal Repayments
Remaining 2016		$ 266,053,000
2017		1,513,200,000
2018		361,158,000
2019		1,003,255,000
2020		1,267,330,000
Thereafter		3,670,578,000
Total amortization of debt and principal repayments		8,081,574,000
Joint Venture Debt
Principal Repayments and Joint Venture Debt
Remaining 2016		163,575,000
2017		549,135,000
2018		9,293,000
2019		554,686,000
2020		30,298,000
Thereafter		547,167,000
Total principal repayments		1,854,154,000
Trust Preferred Securities
Debt Instrument [Line Items]
Proceeds from Issuance of Debt	$ 100,000,000.0
Scheduled Amortization and Principal Repayments
Remaining 2016		0
2017		0
2018		0
2019		0
2020		0
Thereafter		100,000,000
Total amortization of debt and principal repayments		100,000,000
Mortgages and other loans payable
Scheduled Amortization
Remaining 2016		29,859,000
2017		63,644,000
2018		64,119,000
2019		70,255,000
2020		52,799,000
Thereafter		147,604,000
Total amortization of debt		428,280,000
Principal Repayments and Joint Venture Debt
Remaining 2016		236,194,000
2017		1,094,548,000
2018		47,039,000
2019		0
2020		679,531,000
Thereafter		3,122,974,000
Total principal repayments		5,180,286,000
Revolving Credit Facility
Scheduled Amortization and Principal Repayments
Remaining 2016		0
2017		0
2018		0
2019		0
2020		285,000,000
Thereafter		0
Total amortization of debt and principal repayments		285,000,000
Unsecured Term Loan
Scheduled Amortization and Principal Repayments
Remaining 2016		0
2017		0
2018		0
2019		933,000,000
2020		0
Thereafter		0
Total amortization of debt and principal repayments		933,000,000
Senior Unsecured Notes
Scheduled Amortization and Principal Repayments
Remaining 2016		0
2017		355,008,000
2018		250,000,000
2019		0
2020		250,000,000
Thereafter		300,000,000
Total amortization of debt and principal repayments		$ 1,155,008,000
LIBOR \| Trust Preferred Securities
Debt Instrument [Line Items]
Interest rate added to base rate (as a percent)		1.25%
LIBOR \| Unsecured Term Loan
Debt Instrument [Line Items]
Interest rate added to base rate (as a percent)		1.40%

Corporate Indebtedness (Schedule of Consolidated Interest Expense, Excluding Capitalized Interest)(Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Interest expense
Interest expense	$ 95,568	$ 84,083	$ 197,722	$ 169,099
Interest capitalized	(5,433)	(7,611)	(12,051)	(16,169)
Interest income	(1,046)	(726)	(1,910)	(1,377)
Interest expense, net	$ 89,089	$ 75,746	$ 183,761	$ 151,553

Related Party Transactions (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Amounts due from/to related parties
Due from joint ventures	$ 1,443		$ 1,443		$ 1,334
Other	11,616		11,616		9,316
Related party receivables	13,059		13,059		$ 10,650
Alliance Building Services
Related Party Transactions
Profit participation from related party	900	$ 1,000	1,700	$ 1,900
Payments made for services	7,100	4,600	10,900	8,600
Entity with Stephen L Green ownership interest
Related Party Transactions
Property management fees from related party	$ 100	$ 200	$ 100	$ 200

Noncontrolling Interests on the Company's Consolidated Financial Statements (Details)	1 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended
	Jan. 31, 2012 $ / shares shares	Jun. 30, 2016 USD ($) $ / shares	Jun. 30, 2015 USD ($) shares	Jun. 30, 2016 USD ($) $ / shares	Jun. 30, 2015 USD ($) shares	Dec. 31, 2015 USD ($) unit	Jun. 30, 2016 USD ($)	Jun. 30, 2016 shares	Jun. 30, 2016	Jun. 30, 2016 unit	Aug. 31, 2015 shares	Jul. 31, 2015 shares	Feb. 28, 2015 shares	Aug. 31, 2014 shares
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Balance at beginning of period \| $				$ 424,206,000
Net income \| $		$ 5,586,000	$ (1,577,000)	6,508,000	$ 166,000
Accumulated other comprehensive income allocation \| $		(53,000)	42,000	(375,000)	(158,000)
Balance at end of period \| $		486,452,000		$ 486,452,000		$ 424,206,000
Number of company common stock issued on conversion of Series B preferred units				6.71348
SL Green Operating Partnership
Organization
Noncontrolling interest in the operating partnership (as a percent)						3.61%			4.30%
Number of units of operating partnership owned by the noncontrolling interest unit holders (shares)						3,745,766		4,504,212		4,504,212
Shares of common stock reserved for issuance upon redemption of units of limited partnership interest in operating partnership (shares) \| shares								4,504,212
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Balance at beginning of period \| $				$ 424,206,000	469,524,000	$ 469,524,000
Distributions \| $				(6,009,000)		(9,710,000)
Issuance of common units \| $				73,011,000		30,506,000
Redemption of common units \| $				(11,795,000)		(55,697,000)
Net income \| $				6,508,000		10,565,000
Accumulated other comprehensive income allocation \| $		(53,000)	$ 42,000	(375,000)	$ (158,000)	(67,000)
Fair value adjustment \| $				906,000		(20,915,000)
Balance at end of period \| $		$ 486,452,000		$ 486,452,000		$ 424,206,000
SL Green Operating Partnership \| Series G Preferred Units
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Number of preferred units issued (in shares) \| shares	1,902,000
Dividend rate preferred units (as a percent)	4.50%
Liquidation preference of preferred units (in dollars per share)	$ 25.00
Annual dividends on preferred units (in dollars per share)				$ 1.125
Operating partnership common stock value use for conversion of preferred units (in dollars per share)	$ 88.50
Number of company common stock issue on redemption of operation partnership common units	1
SL Green Operating Partnership \| Series F Preferred Units
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Number of preferred units issued (in shares) \| shares								60
Mandatory liquidation preference (in dollars per share) \| $							$ 1,000.00
SL Green Operating Partnership \| Series K Preferred Units
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Number of preferred units issued (in shares) \| shares														563,954
Dividend rate preferred units (as a percent)				3.50%
Liquidation preference of preferred units (in dollars per share)		$ 25.00		$ 25.00
Annual dividends on preferred units (in dollars per share)				0.875
Operating partnership common stock value use for conversion of preferred units (in dollars per share)		134.67		$ 134.67
Preferred Units, shares authorized \| shares								700,000
SL Green Operating Partnership \| Series L Preferred Units
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Number of preferred units issued (in shares) \| shares														378,634
Dividend rate preferred units (as a percent)				4.00%
Liquidation preference of preferred units (in dollars per share)		25.00		$ 25.00
Annual dividends on preferred units (in dollars per share)				$ 1.00
Preferred Units, shares authorized \| shares								500,000
SL Green Operating Partnership \| Series M Preferred Units
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Number of preferred units issued (in shares) \| shares													1,600,000
Dividend rate preferred units (as a percent)				3.75%
Liquidation preference of preferred units (in dollars per share)		25.00		$ 25.00
Annual dividends on preferred units (in dollars per share)				$ 0.9375
Preferred Units, shares authorized \| shares								1,600,000
SL Green Operating Partnership \| Series N Preferred Units
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Number of preferred units issued (in shares) \| shares			552,303		552,303
Dividend rate preferred units (as a percent)				3.00%
Liquidation preference of preferred units (in dollars per share)		25.00		$ 25.00
Annual dividends on preferred units (in dollars per share)				$ 0.75
Preferred Units, shares authorized \| shares								552,303
SL Green Operating Partnership \| Series O Preferred Units
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Dividend rate preferred units (as a percent)				6.25%
Preferred Units, shares authorized \| shares								1
SL Green Operating Partnership \| Series P Preferred Units
Organization
Shares of common stock reserved for issuance upon redemption of units of limited partnership interest in operating partnership (shares) \| shares								200,000
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Number of preferred units issued (in shares) \| shares												200,000
Dividend rate preferred units (as a percent)				4.00%
Liquidation preference of preferred units (in dollars per share)		25.00		$ 25.00
Annual dividends on preferred units (in dollars per share)				$ 1.00
SL Green Operating Partnership \| Series Q Preferred Units
Organization
Shares of common stock reserved for issuance upon redemption of units of limited partnership interest in operating partnership (shares) \| shares								268,000
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Number of preferred units issued (in shares) \| shares												268,000
Dividend rate preferred units (as a percent)				3.50%
Liquidation preference of preferred units (in dollars per share)		25.00		$ 25.00
Annual dividends on preferred units (in dollars per share)				0.875
Operating partnership common stock value use for conversion of preferred units (in dollars per share)		148.95		$ 148.95
SL Green Operating Partnership \| Series R Preferred Units
Organization
Shares of common stock reserved for issuance upon redemption of units of limited partnership interest in operating partnership (shares) \| shares								400,000
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Number of preferred units issued (in shares) \| shares											400,000
Dividend rate preferred units (as a percent)				3.50%
Liquidation preference of preferred units (in dollars per share)		25.00		$ 25.00
Annual dividends on preferred units (in dollars per share)				0.875
Operating partnership common stock value use for conversion of preferred units (in dollars per share)		154.89		$ 154.89
SL Green Operating Partnership \| Series S Preferred Units
Organization
Shares of common stock reserved for issuance upon redemption of units of limited partnership interest in operating partnership (shares) \| shares								1,077,280
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Number of preferred units issued (in shares) \| shares											1,077,280
Dividend rate preferred units (as a percent)				4.00%
Liquidation preference of preferred units (in dollars per share)		25.00		$ 25.00
Annual dividends on preferred units (in dollars per share)				$ 1.00
SL Green Operating Partnership \| Series T Preferred Units
Organization
Shares of common stock reserved for issuance upon redemption of units of limited partnership interest in operating partnership (shares) \| shares								230,000
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Number of preferred units issued (in shares) \| shares								230,000
Dividend rate preferred units (as a percent)				2.75%
Liquidation preference of preferred units (in dollars per share)		25.00		$ 25.00
Annual dividends on preferred units (in dollars per share)				0.6875
Operating partnership common stock value use for conversion of preferred units (in dollars per share)		119.02		$ 119.02
SL Green Operating Partnership \| Series U Preferred Units
Organization
Shares of common stock reserved for issuance upon redemption of units of limited partnership interest in operating partnership (shares) \| shares								680,000
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Number of preferred units issued (in shares) \| shares								680,000
Dividend rate preferred units (as a percent)				4.50%
Liquidation preference of preferred units (in dollars per share)		25.00		$ 25.00
Annual dividends on preferred units (in dollars per share)				1.125
SL Green Operating Partnership \| Series U Preferred Units \| Minimum
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Annual dividends on preferred units (in dollars per share)				$ 0.75
SL Green Operating Partnership \| Series A Preferred Units
Organization
Shares of common stock reserved for issuance upon redemption of units of limited partnership interest in operating partnership (shares) \| shares								109,161
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Number of preferred units issued (in shares) \| shares											109,161
Dividend rate preferred units (as a percent)				3.50%
Liquidation preference of preferred units (in dollars per share)		$ 1,000.00		$ 1,000.00
Annual dividends on preferred units (in dollars per share)				$ 35.00
SL Green Operating Partnership \| Series B Preferred Units
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Number of preferred units issued (in shares) \| shares								0

Noncontrolling Interests on the Company's Consolidated Financial Statements (Common Unit Activity) (Details) - SL Green Operating Partnership - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Rollforward Analysis of Preferred Unit Activity
Issuance of preferred units	$ 73,011	$ 30,506
Redemption of preferred units	(11,795)	(55,697)
Preferred Units
Rollforward Analysis of Preferred Unit Activity
Balance at beginning of period	282,516	71,115
Issuance of preferred units	22,793	211,601
Redemption of preferred units	(2,849)	(200)
Balance at end of period	$ 302,460	$ 282,516

Stockholders' Equity of the Company (Details) - $ / shares	Jun. 30, 2016	Dec. 31, 2015
Stockholders' Equity Note [Abstract]
Authorized capital stock (shares)	260,000,000
Authorized shares, par value (in dollars per share)	$ 0.01
Common stock, shares authorized (in shares)	160,000,000	160,000,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Excess stock, shares authorized (shares)	75,000,000
Excess stock, par value (in dollars per share)	$ 0.01
Preferred stock, shares authorized (shares)	25,000,000
Preferred stock, par value (in dollars per share)	$ 0.01
Shares issued (shares)	100,164,358
Excess shares issued (shares)	0

Stockholders' Equity of the Company (At-the-Market Equity Offering Program and Perpetual Preferred Stock)(Details) - USD ($)	1 Months Ended	6 Months Ended		12 Months Ended
	Aug. 31, 2012	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015	Mar. 31, 2015	Feb. 28, 2015
Stockholders' Equity
Proceeds from sale of common stock		$ 0	$ 124,999,000
Common stock, shares authorized (in shares)		160,000,000		160,000,000
New At-the-Market Equity offering programs
Stockholders' Equity
Aggregate value of the shares of common stock to be sold (up to)					$ 300,000,000.0
Contributions - net proceeds from common stock offering (in shares)				91,180
Proceeds from sale of common stock				$ 12,000,000
Series I Preferred Stock
Stockholders' Equity
Preferred stock, shares outstanding (in shares)		9,200,000		9,200,000
Dividend rate preferred units (as a percent)		6.50%
Perpetual Preferred stock, liquidation preference (in dollars per share)		$ 25.00		$ 25.00
Perpetual Preferred stock, annual dividends per share (in dollars per share)		$ 1.625
Contributions of net proceeds from sale of preferred stock	$ 221,900,000
Dividend Reinvestment and Stock Purchase Plan (DRIP)
Stockholders' Equity
Common stock, shares authorized (in shares)						3,500,000

Stockholders' Equity of the Company (Earnings per Share)(Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Basic Earnings:
Income attributable to SL Green common stockholders	$ 133,457	$ (39,106)	$ 156,678	$ 4,171
Diluted Earnings:
Income attributable to SL Green common stockholders	$ 139,043	$ (39,106)	$ 163,186	$ 4,337
Basic Shares:
Weighted average common shares outstanding (shares)	100,134,000	99,579,000	100,093,000	98,994,000
Effect of Dilutive Securities:
Operating Partnership units redeemable for common shares (shares)	4,342,000	0	4,158,000	3,936,000
Stock-based compensation plans (shares)	316,000	0	282,000	493,000
Diluted weighted average common stock outstanding (shares)	104,792,000	99,579,000	104,533,000	103,423,000
Common stock shares excluded from the diluted shares outstanding (shares)	739,636	845,026	228,122	748,000
Common stock shares excluded from the diluted shares outstanding due to net loss (shares)		4,367,272
Common Stock
Effect of Dilutive Securities:
Redemption of units to common shares	$ 5,586	$ 0	$ 6,508	$ 166

Partners' Capital of the Operating Partnership (Details)	Jun. 30, 2016 shares	Jun. 30, 2016	Jun. 30, 2016 unit	Dec. 31, 2015 unit shares
Common Stock
Stockholders' Equity
Units outstanding (units)	100,164,000			99,976,000
SL Green Operating Partnership
Stockholders' Equity
Noncontrolling interest in the operating partnership (as a percent)		4.30%		3.61%
Number of units of operating partnership owned by the noncontrolling interest unit holders (units)	4,504,212		4,504,212	3,745,766
SL Green Operating Partnership \| Series I Preferred Units
Stockholders' Equity
Units outstanding (units)	9,200,000
SL Green Operating Partnership \| Common Stock
Stockholders' Equity
Units outstanding (units)	100,164,358

Partners' Capital of the Operating Partnership (EPS) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Stockholders' Equity
Net income (loss) attributable to SLGOP common unitholders	$ 133,457	$ (39,106)	$ 156,678	$ 4,171
Weighted average common shares outstanding (shares)	100,134,000	99,579,000	100,093,000	98,994,000
Common stock shares excluded from the diluted shares outstanding (shares)	739,636	845,026	228,122	748,000
Common stock shares excluded from the diluted shares outstanding due to net loss (shares)		4,367,272
SL Green Operating Partnership
Stockholders' Equity
Net income (loss) attributable to SLGOP common unitholders	$ 139,043	$ (40,683)	$ 163,186	$ 4,337
Weighted average common shares outstanding (shares)	104,476,000	103,487,000	104,251,000	102,930,000
Stock-based compensation plans (shares)	316,000	0	282,000	493,000
Diluted weighted average common units outstanding (shares)	104,792,000	103,487,000	104,533,000	103,423,000
Common stock shares excluded from the diluted shares outstanding (shares)	739,636	228,122	845,026	748,000
Common stock shares excluded from the diluted shares outstanding due to net loss (shares)		459,216

Share-based Compensation (Additional Information) (Details)	1 Months Ended			3 Months Ended		6 Months Ended		12 Months Ended
	Jan. 31, 2015 USD ($)	Aug. 31, 2014 shares	Aug. 31, 2011 USD ($)	Jun. 30, 2016 USD ($) unit / shares fungible_unit shares	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($) unit / shares fungible_unit $ / shares shares	Jun. 30, 2015 USD ($)	Dec. 31, 2015 USD ($) shares	Dec. 31, 2014 shares	Sep. 30, 2014 shares	Jun. 30, 2014 shares	Dec. 11, 2013	Dec. 31, 2012 shares	Dec. 17, 2012	Dec. 31, 2011 shares	Dec. 31, 2010 shares	Dec. 31, 2009 USD ($)	Jan. 01, 2008 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Capitalized to assets associated with compensation expense related to our long-term compensation plans, restricted stock and stock options				$ 1,400,000	$ 1,800,000	$ 2,900,000	$ 3,400,000
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period of commencement of option vesting, from date of grant (in years)						1 year
Exercise price of options granted, low end of the range (in dollars per share) \| $ / shares						$ 20.67
Exercise price of options granted, high end of the range (in dollars per share) \| $ / shares						$ 137.18
Remaining weighted average contractual life of the options outstanding (in years)						3 years 7 months 6 days
Remaining average contractual life of the options exercisable (in years)						2 years 10 months 24 days
Total unrecognized compensation cost related to unvested stock awards				12,300,000		$ 12,300,000
Weighted average period for recognition of compensation cost related to unvested stock awards (in years)						1 year 7 months 6 days
Weighted average fair value of options granted during the period						$ 2,258,336		$ 9,522,613
Stock options \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award expiration period (in years)						5 years
Options vesting period (in years)						1 year
Stock options \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award expiration period (in years)						10 years
Options vesting period (in years)						5 years
Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense						$ 3,372,434		7,540,747
Total unrecognized compensation cost related to unvested stock awards				$ 14,700,000		$ 14,700,000
Weighted average period for recognition of compensation cost related to unvested stock awards (in years)						2 years 6 months
Annual award vesting rate, low end of range (as a percent)						15.00%
Annual award vesting rate, high end of range (as a percent)						35.00%
Fair value of restricted stock vested during the period						$ 7,300,000		7,400,000
Weighted average fair value of options granted during the period						$ 781,330		$ 16,061,201
Awards granted (in shares) \| shares						7,500		143,053
Awards outstanding (in shares) \| shares				3,110,781		3,110,781		3,137,881	3,000,979
LTIP units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average fair value of options granted during the period						$ 28,100,000		$ 25,400,000
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation cost related to unvested stock awards				$ 10,500,000		$ 10,500,000
Weighted average period for recognition of compensation cost related to unvested stock awards (in years)						1 year 3 months 18 days
Share-based Compensation				$ 3,300,000	12,800,000	$ 3,100,000	16,300,000
Third Amendment and Restated 2005 Stock Option and Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum fungible units that may be granted (in shares) \| fungible_unit				27,030,000		27,030,000
Fungible units per share (in fungible units per share) \| unit / shares				3.74		3.74
Shares that may be issued if equal to fungible units (shares) (less than) \| shares				27,030,000		27,030,000
Fungible units \| fungible_unit				10,300,000		10,300,000
Third Amendment and Restated 2005 Stock Option and Incentive Plan \| Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense				$ 1,900,000	3,900,000	$ 1,900,000	3,900,000
Stock options, stock appreciation rights and other awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fungible units per share (in fungible units per share) \| unit / shares				0.73		0.73
Award expiration period (in years)						5 years
All other awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fungible units per share (in fungible units per share) \| unit / shares				1		1
Award expiration period (in years)						10 years
2010 Notional Unit Long-Term Compensation Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Capitalized to assets associated with compensation expense related to our long-term compensation plans, restricted stock and stock options	$ 31,700,000
Approximate amount of awards that may be earned by recipients after beginning of the second year if maximum performance achieved																	$ 25,000,000
Approximate amount of awards that may be earned by recipients after beginning of the third year if maximum performance achieved																	$ 25,000,000
Minimum stock price appreciation to earn maximum amount of awards (as a percent)																	50.00%
LTIP units earned (in shares) \| shares													327,416		327,416	385,583
Percentage of LTIP Units earned, vested (percent)												25.00%		50.00%
2010 Notional Unit Long-Term Compensation Plan \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Approximate amount of LTIP units that may be earned by the recipients based on stock price appreciation																	$ 15,000,000
2010 Notional Unit Long-Term Compensation Plan \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Approximate amount of LTIP units that may be earned by the recipients based on stock price appreciation																	$ 75,000,000
2011 Outperformance Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense				$ 0	3,200,000	$ 0	3,900,000
Capitalized to assets associated with compensation expense related to our long-term compensation plans, restricted stock and stock options						26,700,000
Approximate amount of LTIP units that may be earned by the recipients based on stock price appreciation			$ 85,000,000
LTIP units earned (in shares) \| shares										280,454	560,908
Value of LTIP Units that could be earned expressed as percentage of outperformance amount in excess of the 30% benchmark (percent)			10.00%
Duration period return to stockholders exceeds 25% (in years)			3 years
Cumulative return to stockholders (percent)			25.00%
Return to stockholders			$ 85,000,000.0
Performance period (in years)			3 years
2011 Outperformance Plan \| Earned anytime after beginning of the second year
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of units vested			33.33%
2011 Outperformance Plan \| Earned anytime after beginning of the third year
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of units vested			66.67%
2011 Outperformance Plan \| Vested on August 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of units vested			50.00%
2011 Outperformance Plan \| Vesting on August 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of units vested			50.00%
2014 Outperformance Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense				3,300,000	4,800,000	1,500,000	2,900,000
Capitalized to assets associated with compensation expense related to our long-term compensation plans, restricted stock and stock options						27,900,000
LTIP units earned (in shares) \| shares		610,000
Performance period (in years)		3 years
Award period (in years)		3 years
Percentage of LTIP units that may be earned based on the Company's absolute total return to stockholders		66.67%
Percentage of LTIP units that may be earned based on relative total return to stockholders compared to constituents of the MSCI REIT index		33.33%
2014 Outperformance Plan \| Vesting on August 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of units vested		50.00%
2014 Outperformance Plan \| Vesting on August 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of units vested		50.00%
Deferred Stock Compensation Plan for Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense				$ 200,000	$ 300,000	$ 1,800,000	$ 1,700,000
Maximum percentage of the annual retainer fee, chairman fees and meeting fees that may be deferred by non-employee directors (percent)				100.00%		100.00%
Awards granted (in shares) \| shares						7,276
Shares issued (in shares) \| shares						8,749
Awards outstanding (in shares) \| shares				87,968		87,968
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock available for issuance (shares) \| shares																		500,000
Duration of each offering period starting the first day of each calendar quarter (in months)						3 months
Purchase price as a percentage of market value of the common stock (percent)				85.00%		85.00%
Shares of common stock issued (shares) \| shares				91,273		91,273

Share-based Compensation (Details)	6 Months Ended	12 Months Ended
Share-based Compensation (Details)	Jun. 30, 2016 USD ($) $ / shares shares	Dec. 31, 2015 USD ($) $ / shares shares
Stock options
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Dividend yield (as a percent)	2.30%	1.97%
Expected life of option (in years)	4 years 2 months 12 days	3 years 7 months 6 days
Risk-free interest rate (as a percent)	1.08%	1.43%
Expected stock price volatility (as a percent)	29.08%	32.34%
Options Outstanding
Balance at beginning of period (in shares)	1,595,007	1,462,726
Granted (in shares)	109,500	389,836
Exercised (in shares)	(75,201)	(217,438)
Lapsed or cancelled (in shares)	(39,200)	(40,117)
Balance at end of period (in shares)	1,590,106	1,595,007
Options exercisable at end of period (in shares)	865,289	589,055
Weighted average fair value of options granted during the period \| $	$ 2,258,336	$ 9,522,613
Weighted Average Exercise Price
Balance at beginning of year (in dollars per share) \| $ / shares	$ 95.52	$ 87.98
Granted (in dollars per share) \| $ / shares	99.65	112.54
Exercised (in dollars per share) \| $ / shares	75.42	74.69
Lapsed or cancelled (in dollars per share) \| $ / shares	113.38	98.61
Balance at end of period (in dollars per share) \| $ / shares	96.32	95.52
Options exercisable at end of period (in dollars per share) \| $ / shares	$ 89.14	$ 89.85
Restricted Stock Awards
Options Outstanding
Weighted average fair value of options granted during the period \| $	$ 781,330	$ 16,061,201
Summary of restricted stock
Balance at beginning of year (in shares)	3,137,881	3,000,979
Granted (in shares)	7,500	143,053
Cancelled (in shares)	(34,600)	(6,151)
Balance at end of period (in shares)	3,110,781	3,137,881
Vested during the period (in shares)	81,322	87,081
Compensation expense recorded \| $	$ 3,372,434	$ 7,540,747

Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) of the Company [Roll Forward]
Beginning Balance	$ (8,749)
Ending Balance	(16,558)
SL Green Realty Corp
Accumulated Other Comprehensive Income (Loss) of the Company [Roll Forward]
Beginning Balance	(8,749)
Other comprehensive loss before reclassifications	(15,046)
Amounts reclassified from accumulated other comprehensive income	7,237
Ending Balance	(16,558)
Deferred net losses from terminated hedges	8,400	$ 9,700
SL Green Realty Corp \| Net unrealized (loss) gain on derivative instruments
Accumulated Other Comprehensive Income (Loss) of the Company [Roll Forward]
Beginning Balance	(10,160)
Other comprehensive loss before reclassifications	(7,547)
Amounts reclassified from accumulated other comprehensive income	6,175
Ending Balance	(11,532)
SL Green Realty Corp \| Unrealized gain (loss) on marketable securities
Accumulated Other Comprehensive Income (Loss) of the Company [Roll Forward]
Beginning Balance	2,003
Other comprehensive loss before reclassifications	(841)
Amounts reclassified from accumulated other comprehensive income	0
Ending Balance	1,162
SL Green Realty Corp \| Joint venture \| Net unrealized (loss) gain on derivative instruments
Accumulated Other Comprehensive Income (Loss) of the Company [Roll Forward]
Beginning Balance	(592)
Other comprehensive loss before reclassifications	(6,658)
Amounts reclassified from accumulated other comprehensive income	1,062
Ending Balance	$ (6,188)

Fair Value Measurements (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Fair Value of Financial Instruments
Marketable securities	$ 39,339	$ 45,138
Interest rate cap and swap agreements (included in other assets)	0	204
Debt and preferred equity investments	1,357,181	1,670,020
Accrued Interest Payable And Other Liabilities
Fair Value of Financial Instruments
Interest rate cap and swap agreements	3,036	10,776
Liabilities Held for Sale
Fair Value of Financial Instruments
Interest rate cap and swap agreements	0
Carrying Value
Fair Value of Financial Instruments
Debt and preferred equity investments	1,357,181
Fixed rate debt	6,612,587	7,232,254
Variable rate debt	1,451,155	3,202,494
Total	8,063,742	10,434,748
Fair Value
Fair Value of Financial Instruments
Marketable securities	39,339	45,138
Total	8,504,174	10,770,574
Estimated fair value of debt and preferred equity investments, low end of range	1,400,000	1,700,000
Estimated fair value of debt and preferred equity investments, high end of range	1,500,000	1,800,000
Level 1
Fair Value of Financial Instruments
Interest rate cap and swap agreements (included in other assets)	0	0
Level 1 \| Accrued Interest Payable And Other Liabilities
Fair Value of Financial Instruments
Interest rate cap and swap agreements	0	0
Level 1 \| Liabilities Held for Sale
Fair Value of Financial Instruments
Interest rate cap and swap agreements	0
Level 2
Fair Value of Financial Instruments
Interest rate cap and swap agreements (included in other assets)	0	204
Level 2 \| Accrued Interest Payable And Other Liabilities
Fair Value of Financial Instruments
Interest rate cap and swap agreements	3,036	10,776
Level 2 \| Liabilities Held for Sale
Fair Value of Financial Instruments
Interest rate cap and swap agreements	0
Level 3
Fair Value of Financial Instruments
Marketable securities	0	0
Interest rate cap and swap agreements (included in other assets)	0	0
Level 3 \| Accrued Interest Payable And Other Liabilities
Fair Value of Financial Instruments
Interest rate cap and swap agreements	0	0
Level 3 \| Liabilities Held for Sale
Fair Value of Financial Instruments
Interest rate cap and swap agreements	0
Level 3 \| Fair Value
Fair Value of Financial Instruments
Fixed rate debt	7,058,553	7,591,388
Variable rate debt	1,445,621	3,179,186
Equity marketable securities
Fair Value of Financial Instruments
Marketable securities	334	4,704
Equity marketable securities \| Level 1
Fair Value of Financial Instruments
Marketable securities	334	4,704
Commercial mortgage-backed securities
Fair Value of Financial Instruments
Marketable securities	39,005	40,434
Commercial mortgage-backed securities \| Level 2
Fair Value of Financial Instruments
Marketable securities	$ 39,005	$ 40,434

Financial Instruments: Derivatives and Hedging (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Financial Instruments: Derivatives and Hedging
Fair Value	$ 0		$ 0		$ 204,000
Derivative, Fair Value, Net	(3,036,000)		(3,036,000)
Gain (loss) from changes in fair value	500,000	$ 100,000	500,000	$ 100,000
Fair value of derivatives in a net liability position	3,100,000		3,100,000
Aggregate termination value	3,200,000		3,200,000
Estimated current balance held in accumulated other comprehensive loss to be reclassified into earnings within the next 12 months			4,500,000
Share of joint venture of accumulated other comprehensive loss reclassified into equity in net income from unconsolidated joint ventures within the next 12 months			1,800,000
Amount of (Loss) Gain Recognized in Other Comprehensive Loss (Effective Portion)	(4,191,000)	(818,000)	(13,875,000)	(9,576,000)
Amount of Loss Reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion)	5,035,000	3,068,000	7,549,000	6,146,000
Amount of (Loss) or Gain Recognized into Income (Ineffective Portion)	(599,000)	2,000	(1,074,000)	(424,000)
Joint venture
Financial Instruments: Derivatives and Hedging
Amount of (Loss) Gain Recognized in Other Comprehensive Loss (Effective Portion)	(3,005,000)	277,000	(5,770,000)	(960,000)
Amount of Loss Reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion)	567,000	331,000	918,000	662,000
Amount of (Loss) or Gain Recognized into Income (Ineffective Portion)	(600,000)	16,000	(1,036,000)	0
Interest Rate Swap Expiring in December 2017
Financial Instruments: Derivatives and Hedging
Notional Value	$ 200,000,000		$ 200,000,000
Strike Rate (as a percent)	0.9375%		0.9375%
Fair Value	$ (1,202,000)		$ (1,202,000)
Interest Rate Swap Expiring in December 2017
Financial Instruments: Derivatives and Hedging
Notional Value	$ 150,000,000		$ 150,000,000
Strike Rate (as a percent)	0.94%		0.94%
Fair Value	$ (906,000)		$ (906,000)
Interest Rate Swap Expiring in December 2017
Financial Instruments: Derivatives and Hedging
Notional Value	$ 150,000,000		$ 150,000,000
Strike Rate (as a percent)	0.94%		0.94%
Fair Value	$ (906,000)		$ (906,000)
Interest Rate Cap Expiring October 2016
Financial Instruments: Derivatives and Hedging
Notional Value	$ 117,392,000		$ 117,392,000
Strike Rate (as a percent)	6.00%		6.00%
Fair Value	$ 0		$ 0
Interest Rate Swap Expiring in January 2017
Financial Instruments: Derivatives and Hedging
Notional Value	$ 14,409,000		$ 14,409,000
Strike Rate (as a percent)	0.50%		0.50%
Fair Value	$ (4,000)		$ (4,000)
Interest Rate Swap Expiring in February 2017
Financial Instruments: Derivatives and Hedging
Notional Value	$ 8,018,000		$ 8,018,000
Strike Rate (as a percent)	0.852%		0.852%
Fair Value	$ (18,000)		$ (18,000)
Interest Rate Cap Expiring in September 2017
Financial Instruments: Derivatives and Hedging
Notional Value	$ 137,500,000		$ 137,500,000
Strike Rate (as a percent)	4.00%		4.00%
Fair Value	$ 0		$ 0
Interest Rate Cap Expiring in May 2017
Financial Instruments: Derivatives and Hedging
Notional Value	$ 1,450,000,000		$ 1,450,000,000
Strike Rate (as a percent)	4.75%		4.75%
Fair Value	$ 0		$ 0
Interest Rate Swaps/Caps
Financial Instruments: Derivatives and Hedging
Amount of (Loss) Gain Recognized in Other Comprehensive Loss (Effective Portion)	(1,186,000)	(1,095,000)	(8,105,000)	(8,616,000)
Amount of Loss Reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion)	4,468,000	2,737,000	6,631,000	5,484,000
Amount of (Loss) or Gain Recognized into Income (Ineffective Portion)	$ 1,000	$ (14,000)	$ (38,000)	$ (424,000)

Commitments and Contingencies (Details) $ in Thousands	6 Months Ended
Commitments and Contingencies (Details) $ in Thousands	Jun. 30, 2016 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Initial term of non cancellable operating leases, minimum (in years)	1 year
Capital lease
Remaining 2016	$ 1,145
2017	2,387
2018	2,387
2019	2,411
2020	2,620
Thereafter	825,483
Total minimum lease payments	836,433
Amount representing interest	(794,682)
Capital lease obligations	41,751
Non-cancellable operating leases
Remaining 2016	15,468
2017	31,049
2018	31,049
2019	31,066
2020	31,436
Thereafter	764,353
Total minimum lease payments	$ 904,421

Segment Information (Details) $ in Thousands	3 Months Ended		6 Months Ended
Segment Information (Details) $ in Thousands	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($) segment	Jun. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)
Segment information
Number of reportable segments (segment) \| segment			2
Total revenues	$ 617,614	$ 409,074	$ 1,073,058	$ 805,373
(Loss) Income from continuing operations before equity in net gain on sale of interest in unconsolidated joint venture/real estate, gain on sale of real estate, depreciable real estate reserves net of recoveries, and loss on sale of investment in marketable securities	(70,463)	(29,948)	(61,648)	12,278
Total assets	17,544,223		17,544,223		$ 19,727,646
Marketing, general and administrative	24,484	23,200	48,516	48,664
Operating Segments \| Real Estate Segment
Segment information
Total revenues	569,824	361,730	968,180	713,832
(Loss) Income from continuing operations before equity in net gain on sale of interest in unconsolidated joint venture/real estate, gain on sale of real estate, depreciable real estate reserves net of recoveries, and loss on sale of investment in marketable securities	(112,337)	(67,807)	(153,270)	(63,170)
Total assets	15,865,286		15,865,286		18,045,370
Operating Segments \| Debt and Preferred Equity Segment
Segment information
Total revenues	47,790	47,344	104,878	91,541
(Loss) Income from continuing operations before equity in net gain on sale of interest in unconsolidated joint venture/real estate, gain on sale of real estate, depreciable real estate reserves net of recoveries, and loss on sale of investment in marketable securities	41,874	$ 37,859	91,622	$ 75,448
Total assets	$ 1,678,937		$ 1,678,937		$ 1,682,276

Segment Information (Schedule of Reconciliation of Income from Continuing Operations to Net Income Attributable to SL Green Common Stockholders)(Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Reconciliation of income from continuing operations to net income attributable to SL Green common stockholders
(Loss) Income from continuing operations before equity in net gain on sale of interest in unconsolidated joint venture/real estate, gain on sale of real estate, depreciable real estate reserves net of recoveries, and loss on sale of investment in marketable securities	$ (70,463,000)	$ (29,948,000)	$ (61,648,000)	$ 12,278,000
Equity in net gain on sale of interest in unconsolidated joint venture/real estate	33,448,000	769,000	43,363,000	769,000
Gain on sale of real estate, net	196,580,000	0	210,353,000.00	0
Depreciable real estate reserves	(10,387,000)	0	(10,387,000)	0
Loss on sale of investment in marketable securities	(83,000)	0	(83,000)	0
Income (loss) from continuing operations	149,095,000	(29,179,000)	181,598,000	13,047,000
Net income (loss) from discontinued operations	0	0	0	427,000
Gain on sale of discontinued operations	0	0	0	12,983,000
Net income (loss)	$ 149,095,000	$ (29,179,000)	$ 181,598,000	$ 26,457,000

Organization and Basis of Presentation (Schedule of Commercial Office Properties)(Details) $ in Billions	6 Months Ended
	Jun. 30, 2016 USD ($) ft² building shares
Real estate properties
Number of Properties \| building	109
Approximate Square Feet unaudited (sqft)	33,018,905
Weighted Average Occupancy unaudited (as a percent)	88.80%
Debt and preferred equity investments including investments held by unconsolidated joint ventures \| $	$ 1.7
Debt and preferred equity investments and other financing receivables included in other balance sheet items \| $	$ 0.3
Number of shares to be received on redemption of one unit of limited partnership interests (shares) \| shares	1
Commercial properties
Real estate properties
Number of Properties \| building	88
Approximate Square Feet unaudited (sqft)	29,299,036
Weighted Average Occupancy unaudited (as a percent)	91.50%
Residential
Real estate properties
Number of Properties \| building	21
Approximate Square Feet unaudited (sqft)	3,719,869
Weighted Average Occupancy unaudited (as a percent)	67.50%
Managed office properties
Real estate properties
Approximate Square Feet unaudited (sqft)	336,000
Consolidated properties
Real estate properties
Number of Properties \| building	71
Approximate Square Feet unaudited (sqft)	24,057,221
Consolidated properties \| Commercial properties
Real estate properties
Number of Properties \| building	67
Approximate Square Feet unaudited (sqft)	23,294,634
Consolidated properties \| Residential
Real estate properties
Number of Properties \| building	4
Approximate Square Feet unaudited (sqft)	762,587
Unconsolidated properties
Real estate properties
Number of Properties \| building	38
Approximate Square Feet unaudited (sqft)	8,961,684
Unconsolidated properties \| Commercial properties
Real estate properties
Number of Properties \| building	21
Approximate Square Feet unaudited (sqft)	6,004,402
Unconsolidated properties \| Residential
Real estate properties
Number of Properties \| building	17
Approximate Square Feet unaudited (sqft)	2,957,282
Manhattan
Real estate properties
Number of Properties \| building	57
Approximate Square Feet unaudited (sqft)	24,370,736
Weighted Average Occupancy unaudited (as a percent)	93.40%
Manhattan \| Office
Real estate properties
Number of Properties \| building	31
Approximate Square Feet unaudited (sqft)	22,612,745
Weighted Average Occupancy unaudited (as a percent)	95.60%
Manhattan \| Retail
Real estate properties
Number of Properties \| building	19
Approximate Square Feet unaudited (sqft)	771,515
Weighted Average Occupancy unaudited (as a percent)	87.80%
Manhattan \| Development/Redevelopment
Real estate properties
Number of Properties \| building	6
Approximate Square Feet unaudited (sqft)	809,946
Weighted Average Occupancy unaudited (as a percent)	34.90%
Manhattan \| Fee Interest
Real estate properties
Number of Properties \| building	1
Approximate Square Feet unaudited (sqft)	176,530
Weighted Average Occupancy unaudited (as a percent)	100.00%
Manhattan \| Residential
Real estate properties
Number of Properties \| building	21
Approximate Square Feet unaudited (sqft)	3,719,869
Weighted Average Occupancy unaudited (as a percent)	67.50%
Manhattan \| Consolidated properties
Real estate properties
Number of Properties \| building	39
Approximate Square Feet unaudited (sqft)	19,006,334
Manhattan \| Consolidated properties \| Office
Real estate properties
Number of Properties \| building	25
Approximate Square Feet unaudited (sqft)	18,368,606
Manhattan \| Consolidated properties \| Retail
Real estate properties
Number of Properties \| building	10
Approximate Square Feet unaudited (sqft)	418,563
Manhattan \| Consolidated properties \| Development/Redevelopment
Real estate properties
Number of Properties \| building	3
Approximate Square Feet unaudited (sqft)	42,635
Manhattan \| Consolidated properties \| Fee Interest
Real estate properties
Number of Properties \| building	1
Approximate Square Feet unaudited (sqft)	176,530
Manhattan \| Consolidated properties \| Residential
Real estate properties
Number of Properties \| building	4
Approximate Square Feet unaudited (sqft)	762,587
Manhattan \| Consolidated properties \| Dual property type, retail portion
Real estate properties
Approximate Square Feet unaudited (sqft)	270,132
Manhattan \| Consolidated properties \| Dual property type, residential portion
Real estate properties
Approximate Square Feet unaudited (sqft)	222,855
Manhattan \| Unconsolidated properties
Real estate properties
Number of Properties \| building	18
Approximate Square Feet unaudited (sqft)	5,364,402
Manhattan \| Unconsolidated properties \| Office
Real estate properties
Number of Properties \| building	6
Approximate Square Feet unaudited (sqft)	4,244,139
Manhattan \| Unconsolidated properties \| Retail
Real estate properties
Number of Properties \| building	9
Approximate Square Feet unaudited (sqft)	352,952
Manhattan \| Unconsolidated properties \| Development/Redevelopment
Real estate properties
Number of Properties \| building	3
Approximate Square Feet unaudited (sqft)	767,311
Manhattan \| Unconsolidated properties \| Fee Interest
Real estate properties
Number of Properties \| building	0
Approximate Square Feet unaudited (sqft)	0
Manhattan \| Unconsolidated properties \| Residential
Real estate properties
Number of Properties \| building	17
Approximate Square Feet unaudited (sqft)	2,957,282
Suburban
Real estate properties
Number of Properties \| building	31
Approximate Square Feet unaudited (sqft)	4,928,300
Weighted Average Occupancy unaudited (as a percent)	82.30%
Suburban \| Office
Real estate properties
Number of Properties \| building	28
Approximate Square Feet unaudited (sqft)	4,875,300
Weighted Average Occupancy unaudited (as a percent)	82.10%
Suburban \| Retail
Real estate properties
Number of Properties \| building	1
Approximate Square Feet unaudited (sqft)	52,000
Weighted Average Occupancy unaudited (as a percent)	100.00%
Suburban \| Development/Redevelopment
Real estate properties
Number of Properties \| building	2
Approximate Square Feet unaudited (sqft)	1,000
Weighted Average Occupancy unaudited (as a percent)	100.00%
Suburban \| Residential
Real estate properties
Number of Properties \| building	0
Approximate Square Feet unaudited (sqft)	0
Weighted Average Occupancy unaudited (as a percent)	0.00%
Suburban \| Consolidated properties
Real estate properties
Number of Properties \| building	28
Approximate Square Feet unaudited (sqft)	4,288,300
Suburban \| Consolidated properties \| Office
Real estate properties
Number of Properties \| building	26
Approximate Square Feet unaudited (sqft)	4,235,300
Suburban \| Consolidated properties \| Retail
Real estate properties
Number of Properties \| building	1
Approximate Square Feet unaudited (sqft)	52,000
Suburban \| Consolidated properties \| Development/Redevelopment
Real estate properties
Number of Properties \| building	1
Approximate Square Feet unaudited (sqft)	1,000
Suburban \| Consolidated properties \| Residential
Real estate properties
Number of Properties \| building	0
Approximate Square Feet unaudited (sqft)	0
Suburban \| Unconsolidated properties
Real estate properties
Number of Properties \| building	3
Approximate Square Feet unaudited (sqft)	640,000
Suburban \| Unconsolidated properties \| Office
Real estate properties
Number of Properties \| building	2
Approximate Square Feet unaudited (sqft)	640,000
Suburban \| Unconsolidated properties \| Retail
Real estate properties
Number of Properties \| building	0
Approximate Square Feet unaudited (sqft)	0
Suburban \| Unconsolidated properties \| Development/Redevelopment
Real estate properties
Number of Properties \| building	1
Approximate Square Feet unaudited (sqft)	0
Suburban \| Unconsolidated properties \| Residential
Real estate properties
Number of Properties \| building	0
Approximate Square Feet unaudited (sqft)	0