0001040971-23-000040 | 10-Q | XBRL Viewer

(1) The Company's consolidated balance sheets include assets and liabilities of consolidated variable interest entities ("VIEs"). See Note 2. The consolidated balance sheets include the following amounts related to our consolidated VIEs, excluding the Operating Partnership: $41.2 million and $41.2 million of land, $39.8 million and $41.0 million of building and improvements, $— million and $— million of building and leasehold improvements, $— million and $— million of right of use assets, $5.2 million and $4.4 million of accumulated depreciation, $664.1 million and $599.2 million of other assets included in other line items, $50.0 million and $49.8 million of real estate debt, net, $0.0 million and $0.2 million of accrued interest payable, $— million and $— million of lease liabilities, and $304.7 million and $146.4 million of other liabilities included in other line items as of September 30, 2023 and December 31, 2022, respectively.

[2]

(1) The Operating Partnership's consolidated balance sheets include assets and liabilities of consolidated variable interest entities ("VIEs"). See Note 2. The consolidated balance sheets include the following amounts related to our consolidated VIEs, excluding the Operating Partnership: $41.2 million and $41.2 million of land, $39.8 million and $41.0 million of building and improvements, $— million and $— million of building and leasehold improvements, $— million and $— million of right of use assets, $5.2 million and $4.4 million of accumulated depreciation, $664.1 million and $599.2 million of other assets included in other line items, $50.0 million and $49.8 million of real estate debt, net, $0.0 million and $0.2 million of accrued interest payable, $— million and $— million of lease liabilities, and $304.7 million and $146.4 million of other liabilities included in other line items as of September 30, 2023 and December 31, 2022, respectively.

Related Party Transactions (Tables)

9 Months Ended

Sep. 30, 2023

Schedule of amounts due from/to related parties

Amounts due from joint ventures and related parties as of September 30, 2023 and December 31, 2022 consisted of the following (in thousands):


	September 30, 2023		December 31, 2022
Due from joint ventures	$	8,219	$	26,812
Other	1,504		540
Related party receivables	$	9,723	$	27,352

Segment Information

9 Months Ended

Sep. 30, 2023

Segment Reporting [Abstract]

Segment Information

The Company has two reportable segments, real estate and debt and preferred equity investments. We evaluate real estate performance and allocate resources based on earnings contributions.

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

Selected consolidated results of operations for the three and nine months ended September 30, 2023 and 2022, and selected asset information as of September 30, 2023 and December 31, 2022, regarding our operating segments are as follows (in thousands):


	Real Estate Segment		Debt and Preferred Equity Segment		Total Company
Total revenues
Three months ended:
September 30, 2023	$	163,531	$	9,689	$	173,220
September 30, 2022	$	182,943	$	29,513	$	212,456
Nine months ended:
September 30, 2023	$	590,016	$	27,849	$	617,865
September 30, 2022	$	532,057	$	69,808	$	601,865
Net (loss) income
Three months ended:
September 30, 2023	$	(22,282)	$	588	$	(21,694)
September 30, 2022	$	(8,934)	$	21,145	$	12,211
Nine months ended:
September 30, 2023	$	(446,005)	$	6,726	$	(439,279)
September 30, 2022	$	(65,824)	$	53,571	$	(12,253)
Total assets
As of:
September 30, 2023	$	9,354,243	$	336,339	$	9,690,582
December 31, 2022	$	11,727,418	$	628,376	$	12,355,794

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 to the debt and preferred equity segment because that segment does not have dedicated personnel and the use of personnel and resources is dependent on transaction volume between the two segments and varies between periods. In addition, we base performance on the individual segments prior to allocating marketing, general and administrative expenses. For the three and nine months ended September 30, 2023, marketing, general and administrative expenses totaled $22.9 million and $69.1 million. For the three months ended September 30, 2022, marketing, general and administrative expenses totaled $21.3 million and $69.6 million. All other expenses, except interest, relate entirely to the real estate assets.

There were no transactions between the above two segments.

- 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 22
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-22

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 15
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-15

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 31
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-31

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 32
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-32

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-42

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 32
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-32

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 40
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-40

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-Name Accounting Standards Codification
-Publisher FASB
-URI https://asc.fasb.org//280/tableOfContent

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 26
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-26

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 34
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-34

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 41
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-41

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 21
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-21

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 21
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-21

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 32
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-32

+ Details

Consolidated Statements of Operations (Partnership) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Revenues
Rental revenue, net	$ 150,991	$ 162,952	$ 531,978	$ 474,215
Investment income	9,689	29,513	27,849	69,808
Other income	12,540	19,991	58,038	57,842
Total revenues	173,220	212,456	617,865	601,865
Expenses
Operating expenses	49,585	45,011	148,606	127,151
Real estate taxes	31,195	35,111	112,463	96,677
Operating lease rent	7,253	7,388	20,209	20,429
Interest expense, net of interest income	27,440	21,824	109,714	51,854
Amortization of deferred financing costs	2,152	2,043	6,327	5,908
Depreciation and amortization	50,212	48,462	197,844	142,359
Loan loss and other investment reserves, net of recoveries	0	0	6,890	0
Transaction related costs	166	292	1,083	321
Marketing, general and administrative	22,873	21,276	69,132	69,574
Total expenses	190,876	181,407	672,268	514,273
Equity in net loss from unconsolidated joint ventures	(15,126)	(21,997)	(44,470)	(31,262)
Equity in net loss on sale of interest in unconsolidated joint venture/real estate	0	0	(79)	(131)
Purchase price and other fair value adjustments	10,183	(1,117)	(6,987)	(7,348)
Gain (loss) on sale of real estate, net	516	4,276	(27,813)	(61,104)
Depreciable real estate reserves and impairment	389	0	(305,527)	0
Net (loss) income	(21,694)	12,211	(439,279)	(12,253)
Net loss (income) attributable to noncontrolling interests:
Noncontrolling interests in other partnerships	1,794	993	4,459	(2,269)
Preferred units distributions	(1,903)	(1,598)	(5,352)	(4,844)
Net (loss) income attributable to SL Green	(20,229)	11,115	(412,679)	(17,535)
Perpetual preferred stock dividends	(3,738)	(3,738)	(11,213)	(11,213)
SL Green Operating Partnership
Revenues
Rental revenue, net	150,991	162,952	531,978	474,215
Investment income	9,689	29,513	27,849	69,808
Other income	12,540	19,991	58,038	57,842
Total revenues	173,220	212,456	617,865	601,865
Expenses
Operating expenses	49,585	45,011	148,606	127,151
Real estate taxes	31,195	35,111	112,463	96,677
Operating lease rent	7,253	7,388	20,209	20,429
Interest expense, net of interest income	27,440	21,824	109,714	51,854
Amortization of deferred financing costs	2,152	2,043	6,327	5,908
Depreciation and amortization	50,212	48,462	197,844	142,359
Loan loss and other investment reserves, net of recoveries	0	0	6,890	0
Transaction related costs	166	292	1,083	321
Marketing, general and administrative	22,873	21,276	69,132	69,574
Total expenses	190,876	181,407	672,268	514,273
Equity in net loss from unconsolidated joint ventures	(15,126)	(21,997)	(44,470)	(31,262)
Equity in net loss on sale of interest in unconsolidated joint venture/real estate	0	0	(79)	(131)
Purchase price and other fair value adjustments	10,183	(1,117)	(6,987)	(7,348)
Gain (loss) on sale of real estate, net	516	4,276	(27,813)	(61,104)
Depreciable real estate reserves and impairment	389	0	(305,527)	0
Net (loss) income	(21,694)	12,211	(439,279)	(12,253)
Net loss (income) attributable to noncontrolling interests:
Noncontrolling interests in other partnerships	1,794	993	4,459	(2,269)
Preferred units distributions	(1,903)	(1,598)	(5,352)	(4,844)
Net (loss) income attributable to SL Green	(21,803)	11,606	(440,172)	(19,366)
Perpetual preferred stock dividends	(3,738)	(3,738)	(11,213)	(11,213)
Net (loss) income attributable to SLGOP common unitholders	$ (25,541)	$ 7,868	$ (451,385)	$ (30,579)
Basic (loss) earnings per unit (in dollars per share)	$ (0.38)	$ 0.11	$ (6.63)	$ (0.47)
Diluted (loss) earnings per unit (in dollars per share)	$ (0.38)	$ 0.11	$ (6.63)	$ (0.47)
Basic weighted average common units outstanding (in shares)	68,296	68,037	68,274	68,075
Diluted weighted average common units and common unit equivalents outstanding (in shares)	68,296	68,897	68,274	69,249

Segment Information (Tables)

9 Months Ended

Sep. 30, 2023

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:
September 30, 2023	$	163,531	$	9,689	$	173,220
September 30, 2022	$	182,943	$	29,513	$	212,456
Nine months ended:
September 30, 2023	$	590,016	$	27,849	$	617,865
September 30, 2022	$	532,057	$	69,808	$	601,865
Net (loss) income
Three months ended:
September 30, 2023	$	(22,282)	$	588	$	(21,694)
September 30, 2022	$	(8,934)	$	21,145	$	12,211
Nine months ended:
September 30, 2023	$	(446,005)	$	6,726	$	(439,279)
September 30, 2022	$	(65,824)	$	53,571	$	(12,253)
Total assets
As of:
September 30, 2023	$	9,354,243	$	336,339	$	9,690,582
December 31, 2022	$	11,727,418	$	628,376	$	12,355,794

Lease Income - Lease Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Leases [Abstract]
Fixed lease payments	$ 131,664	$ 142,778	$ 457,454	$ 416,033
Variable lease payments	19,467	19,990	60,211	58,283
Total lease payments	151,131	162,768	517,665	474,316
Amortization of acquired above and below-market leases	(140)	184	14,313	(101)
Total rental revenue	150,991	162,952	531,978	474,215
Sublease Income	49,700	55,700	147,400	169,900
Interest income	$ 1,113	$ 1,099	$ 3,328	$ 3,286

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Operating Activities
Net loss	$ (21,694)	$ 12,211	$ (439,279)	$ (12,253)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization			204,171	148,267
Equity in net loss from unconsolidated joint ventures	15,126	21,997	44,470	31,262
Distributions of cumulative earnings from unconsolidated joint ventures			514	448
Equity in net loss on sale of interest in unconsolidated joint venture interest/real estate	0	0	79	131
Purchase price and other fair value adjustments			6,987	7,348
Depreciable real estate reserves and impairment			305,527	0
Loss on sale of real estate, net	(516)	(4,276)	27,813	61,104
Loan loss reserves and other investment reserves, net of recoveries	0	0	6,890	0	$ 0
Deferred rents receivable			(16,195)	(1,371)
Non-cash lease expense			15,477	17,332
Other non-cash adjustments			6,645	(11,950)
Changes in operating assets and liabilities:
Tenant and other receivables			(2,852)	7,800
Related party receivables			16,466	5,803
Deferred lease costs			(8,066)	(10,227)
Other assets			(13,254)	(35,114)
Accounts payable, accrued expenses, other liabilities and security deposits			23,655	21,345
Deferred revenue			9,978	17,208
Lease liability - operating leases			(7,688)	2,495
Net cash provided by operating activities			181,338	249,628
Investing Activities
Acquisitions of real estate property			0	(64,491)
Additions to land, buildings and improvements			(194,035)	(194,997)
Acquisition deposits and deferred purchase price			0	75,400
Investments in unconsolidated joint ventures			(119,522)	(146,598)
Distributions in excess of cumulative earnings from unconsolidated joint ventures			108,884	92,217
Net proceeds from disposition of real estate/joint venture interest			547,605	353,853
Cash and restricted cash assumed from acquisition of real estate investment			0	60,494
Proceeds from sale or redemption of marketable securities			0	11,465
Other investments			(17,545)	1,619
Origination of debt and preferred equity investments			(53,703)	(40,053)
Repayments or redemption of debt and preferred equity investments			0	124,405
Net cash provided by investing activities			271,684	273,314
Financing Activities
Proceeds from mortgages and other loans payable			0	381,980
Repayments of mortgages and other loans payable			(4,340)	(290,936)
Proceeds from revolving credit facility, term loans and unsecured notes			358,000	1,124,000
Repayments of revolving credit facility, term loans and unsecured notes			(808,000)	(1,364,000)
Proceeds from stock options exercised and DRSPP issuance			439	339
Repurchase of common stock			0	(151,197)
Redemption of preferred stock			(11,700)	(17,967)
Redemption of OP units			(8,900)	(35,316)
Distributions to noncontrolling interests in other partnerships			(1,614)	(3,168)
Contributions from noncontrolling interests in other partnerships			3,580	52,164
Acquisition of subsidiary interest from noncontrolling interest			0	(29,817)
Distributions to noncontrolling interests in the Operating Partnership			(11,225)	(12,635)
Dividends paid on common and preferred stock			(172,920)	(197,124)
Other obligations related to secured borrowing			129,656	77,874
Tax withholdings related to restricted share awards			0	(3,915)
Deferred loan costs			(729)	(5,130)
Net cash used in financing activities			(527,753)	(474,848)
Net (decrease) increase in cash, cash equivalents, and restricted cash			(74,731)	48,094
Cash, cash equivalents, and restricted cash at beginning of year			384,054	336,984	336,984
Cash, cash equivalents, and restricted cash at end of period	309,323	385,078	309,323	385,078	384,054
Supplemental Disclosure of Non-Cash Investing and Financing Activities:
Exchange of preferred equity investment for real estate or equity in joint venture			0	190,652
Exchange of debt investment for real estate or equity in joint venture			349,946	193,995
Assumption of mortgage and mezzanine loans			0	1,712,750
Issuance of special dividend paid primarily in stock			0	160,620
Tenant improvements and capital expenditures payable			0	18,518
Fair value adjustment to noncontrolling interest in the Operating Partnership			8,072	23,539
Deconsolidation of a subsidiary			101,351	0
Contribution to consolidated joint venture interest			8,134	0
Debt and preferred equity investments			0	302
Removal of fully depreciated commercial real estate properties			7,747	4,048
Recognition of right of use assets and related lease liabilities			0	57,938
Cash and cash equivalents	189,750	201,267	189,750	201,267	203,273
Restricted cash	119,573	183,811	119,573	183,811	180,781
Total cash, cash equivalents, and restricted cash	$ 309,323	$ 385,078	$ 309,323	$ 385,078	$ 384,054

Organization and Basis of Presentation (Tables)

9 Months Ended

Sep. 30, 2023

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of commercial office properties

On September 30, 2023, we owned the following interests in properties in the New York metropolitan area, primarily in midtown Manhattan. Our investments located outside of Manhattan are referred to as the Suburban properties:


			Consolidated			Unconsolidated		Total
Location	Property Type		Number of Buildings		Approximate Square Feet (unaudited)	Number of Buildings	Approximate Square Feet (unaudited)	Number of Buildings	Approximate Square Feet (unaudited)	Weighted Average Leased Occupancy (1) (unaudited)
Commercial:
Manhattan	Office		13		8,399,141	12	15,412,174	25	23,811,315	89.3	%
	Retail		2		17,888	8	294,865	10	312,753	91.0	%
	Development/Redevelopment	(1)	4	(2)	1,466,419	3	2,893,357	7	4,359,776	N/A

			19		9,883,448	23	18,600,396	42	28,483,844	N/A
Suburban	Office		7		862,800	—	—	7	862,800	77.4	%



Total commercial properties			26		10,746,248	23	18,600,396	49	29,346,644	N/A
Residential:
Manhattan	Residential		1	(2)	140,382	1	221,884	2	362,266	99.0	%

Total portfolio			27		10,886,630	24	18,822,280	51	29,708,910	N/A

(1)The weighted average leased occupancy for commercial properties represents the total leased square footage divided by the total square footage at acquisition. The weighted average leased occupancy for residential properties represents the total leased units divided by the total available units. Properties under construction are not included in the calculation of weighted average leased occupancy.

(2)As of September 30, 2023, we owned a building at 7 Dey Street / 185 Broadway that was comprised of approximately 140,382 square feet (unaudited) of residential space and approximately 50,206 square feet (unaudited) of office and retail space that is under development. For the purpose of this report, we have included this building in the number of residential properties we own. However, we have included only the residential square footage in the residential approximate square footage, and have listed the balance of the square footage as development square footage.

Share-based Compensation - Stock Options and Restricted Stock Activity (Details)	9 Months Ended	12 Months Ended
	Sep. 30, 2023 USD ($) $ / shares shares	Dec. 31, 2022 USD ($) $ / shares shares
Stock options
Options Outstanding
Balance at beginning of period (in shares)	313,480	394,089
Exercised (in shares)	0	0
Lapsed or canceled (in shares)	(120,000)	(80,609)
Balance at end of period (in shares)	193,480	313,480
Options exercisable at end of period (in shares)	193,480	313,480
Weighted Average Exercise Price
Balance at beginning of year (in dollars per share) \| $ / shares	$ 97.59	$ 100.56
Exercised (in dollars per share) \| $ / shares	0	0
Lapsed or canceled (in dollars per share) \| $ / shares	79.56	112.14
Balance at end of period (in dollars per share) \| $ / shares	99.03	97.59
Options exercisable at end of period (in dollars per share) \| $ / shares	$ 99.03	$ 97.59
Restricted Stock Awards
Summary of restricted stock
Balance at beginning of year (in shares)	3,758,174	3,459,363
Granted (in shares)	13,000	314,995
Canceled (in shares)	(1,650)	(16,184)
Balance at end of period (in shares)	3,769,524	3,758,174
Vested during the period (in shares)	145,415	118,255
Compensation expense \| $	$ 5,782,841	$ 10,133,905
Total fair value of shares granted during the period \| $	$ 483,860	$ 16,804,931

Consolidated Statements of Comprehensive (Loss) Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (21,694)	$ 12,211	$ (439,279)	$ (12,253)
Other comprehensive income:
Increase in unrealized value of derivative instruments, including SL Green's share of joint venture derivative instruments	12,799	50,488	23,062	111,378
(Decrease) increase in unrealized value of marketable securities	(181)	1,605	(1,625)	(642)
Other comprehensive income	12,618	52,093	21,437	110,736
Comprehensive (loss) income	(9,076)	64,304	(417,842)	98,483
Net loss (income) attributable to noncontrolling interests and preferred units distributions	1,465	(1,096)	26,600	(5,282)
Other comprehensive income attributable to noncontrolling interests	(771)	(3,114)	(1,425)	(6,404)
Comprehensive (loss) income attributable to SL Green	$ (8,382)	$ 60,094	$ (392,667)	$ 86,797

Debt and Preferred Equity Investments - Rollforward of Net Book Balance (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Balance at beginning of period	$ 623,280	$ 1,088,723
Redemptions/sales/syndications/equity ownership/amortization	(349,947)	(565,940)
Net change in loan loss reserves	(6,890)	0
Balance at end of period	334,327	623,280
Debt investment originations/fundings/accretion
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Originations/Accretion	61,845	62,992
Preferred equity investment originations/accretion
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Originations/Accretion	$ 6,039	$ 37,505

Lease Income (Tables)

9 Months Ended

Sep. 30, 2023

Leases [Abstract]

Operating lease, lease income

The components of lease income from operating leases during the three and nine months ended September 30, 2023 and 2022 were as follows (in thousands):


	Three Months Ended September 30,				Nine Months Ended September 30,
	2023		2022		2023		2022
Fixed lease payments	$	131,664	$	142,778	$	457,454	$	416,033
Variable lease payments	19,467		19,990		60,211		58,283
Total lease payments (1)	$	151,131	$	162,768	$	517,665	$	474,316
Amortization of acquired above and below-market leases	(140)		184		14,313		(101)
Total rental revenue	$	150,991	$	162,952	$	531,978	$	474,215

(1)Amounts include $49.7 million and $147.4 million of sublease income during the three and nine months ended September 30, 2023 and $55.7 million and $169.9 million of sublease income during the three and nine months ended September 30, 2022, respectively.

Sales-type lease, lease income

The components of lease income from sales-type leases during the three and nine months ended September 30, 2023 and 2022 were as follows (in thousands):


	Three Months Ended September 30,				Nine Months Ended September 30,
	2023		2022		2023		2022

Interest income (1)	$	1,113	$	1,099	$	3,328	$	3,286

(1)These amounts are included in Other income in our consolidated statements of operations.

Consolidated Balance Sheets (Partnership) (Parenthetical) - USD ($) shares in Thousands, $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Assets
Debt and preferred equity investments, discount and deferred origination fees	$ 1,638	$ 1,811
Allowance for loan and lease losses, real estate	13,520	6,630
SLGOP partners' capital:
Land and land interests	1,090,370	1,576,927
Building and improvements	3,605,247	4,903,776
Building leasehold and improvements	1,343,386	1,691,831
Right of use asset - operating leases	953,236	1,026,265
Accumulated depreciation	1,997,942	2,039,554
Other assets	472,071	546,945
Mortgages and other loans payable, net	1,512,746	3,227,563
Lease liability - financing leases	105,198	104,218
Other liabilities	453,349	236,211
SL Green Operating Partnership
Assets
Debt and preferred equity investments, discount and deferred origination fees	1,638	1,811
Allowance for loan and lease losses, real estate	$ 13,520	$ 6,630
Liabilities
Limited partner interests in Operating Partnership, limited partner common units outstanding (shares)	4,139	3,670
SLGOP partners' capital:
SL Green partner's capital, general partner common units outstanding (shares)	685	680
SL Green partners' capital, limited partner common units outstanding (shares)	63,713	63,700
Land and land interests	$ 1,090,370	$ 1,576,927
Building and improvements	3,605,247	4,903,776
Building leasehold and improvements	1,343,386	1,691,831
Right of use asset - operating leases	953,236	1,026,265
Accumulated depreciation	1,997,942	2,039,554
Other assets	472,071	546,945
Mortgages and other loans payable, net	1,512,746	3,227,563
Lease liability - financing leases	105,198	104,218
Other liabilities	453,349	236,211
Service Corporation
SLGOP partners' capital:
Land and land interests	41,200	41,200
Building and improvements	39,800	41,000
Building leasehold and improvements	0	0
Right of use asset - operating leases	0	0
Accumulated depreciation	5,200	4,400
Other assets	664,100	599,200
Mortgages and other loans payable, net	50,000	49,800
Accrued interest payable	0	200
Lease liability - financing leases	0	0
Other liabilities	$ 304,700	$ 146,400
Series I Preferred Stock \| SL Green Operating Partnership
SLGOP partners' capital:
Preferred units, liquidation preference (in dollars per share)	$ 25.00	$ 25.00
Preferred units, shares issued (in shares)	9,200	9,200
Preferred units, shares outstanding (in shares)	9,200	9,200

Consolidated Statements of Operations (Partnership) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Expenses
Operating expenses	$ 49,585	$ 45,011	$ 148,606	$ 127,151
Related Party
Expenses
Operating expenses	2	0	3	5,695
SL Green Operating Partnership
Expenses
Operating expenses	49,585	45,011	148,606	127,151
SL Green Operating Partnership \| Related Party
Expenses
Operating expenses	$ 2	$ 0	$ 3	$ 5,695

Share-based Compensation - Additional Information (Details)		3 Months Ended		9 Months Ended		12 Months Ended
	Jan. 01, 2008 shares	Sep. 30, 2023 USD ($) unit / shares unit fungibleUnit shares	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) unit / shares unit fungibleUnit shares	Sep. 30, 2022 USD ($)	Dec. 31, 2022 USD ($) shares	Dec. 31, 2021 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		$ 300,000	$ 500,000	$ 1,000,000	$ 1,400,000
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
Options granted (in shares) \| shares				0		0
Remaining weighted average contractual life of the options outstanding (in years)				2 years 1 month 6 days
Remaining average contractual life of the options exercisable (in years)				2 years 1 month 6 days
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
Class O LTIP Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Preferred unit distributions as a percentage of common unit distributions		10.00%		10.00%
Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense				$ 5,782,841		$ 10,133,905
Total unrecognized compensation cost related to unvested stock awards		$ 7,100,000		$ 7,100,000
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				$ 10,000,000		9,700,000
Weighted average period for recognition of compensation cost related to unvested stock awards (in years)				1 year 6 months
Weighted average fair value of options granted during the period				$ 483,860		$ 16,804,931
Awards granted (in shares) \| shares				13,000		314,995
Awards outstanding (in shares) \| shares		3,769,524		3,769,524		3,758,174	3,459,363
LTIP units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average fair value of options granted during the period				$ 37,900,000		$ 45,000,000
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense		$ 10,600,000	10,100,000	31,200,000	30,500,000
Total unrecognized compensation cost related to unvested stock awards		$ 50,500,000		$ 50,500,000
Weighted average period for recognition of compensation cost related to unvested stock awards (in years)				1 year 7 months 6 days
All other awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term				10 years
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) \| unit		32,210,000		32,210,000
Fungible units per share (in fungible units per share) \| unit / shares		2.59		2.59
Shares that may be issued if equal to fungible units (shares) (less than) \| shares		32,210,000		32,210,000
Fungible units \| fungibleUnit		4,000,000		4,000,000
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		$ 0	0	$ 0	0
Total unrecognized compensation cost related to unvested stock awards		$ 0		$ 0
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		0.84		0.84
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		1.0		1.0
Deferred Stock Compensation Plan for Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense		$ 200,000	$ 200,000	$ 2,500,000	$ 2,400,000
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				37,112
Shares issued (in shares) \| shares				27,739
Awards outstanding (in shares) \| shares		228,105		228,105
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
Discount from market price	85.00%
Shares of common stock issued (shares) \| shares		217,081		217,081

Debt and Preferred Equity Investments - Narrative (Details)	3 Months Ended		9 Months Ended		12 Months Ended	38 Months Ended
	Sep. 30, 2023 USD ($) investment	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) investment segment	Sep. 30, 2022 USD ($)	Dec. 31, 2022 USD ($) investment segment	Sep. 30, 2023 USD ($) investment
Preferred equity investment
Number of investments, nonperforming \| investment	3		3		1	3
Debt and preferred equity investments	$ 334,327,000		$ 334,327,000		$ 623,280,000	$ 334,327,000
Recorded investment, past due	334,327,000		$ 334,327,000		$ 623,280,000	334,327,000
Number of portfolio segments of financial receivables (segment) \| segment			1		1
Current period provision for loan loss	0	$ 0	$ 6,890,000	$ 0	$ 0
Recorded investment, nonaccrual status	5,600,000		5,600,000			5,600,000
Loan interest income						0
Other Assets
Preferred equity investment
Additional amount of financing receivables included in other assets	9,100,000		9,100,000		9,000,000	9,100,000
Current period provision for loan loss	0	$ 0	0	$ 0
Financing Receivables, Equal to Greater than 90 Days Past Due
Preferred equity investment
Recorded investment, past due	0		0		0	0
Preferred equity investments
Preferred equity investment
Additional amount of financing receivables included in other assets	125,897,000		125,897,000		119,858,000	125,897,000
Total floating rate
Preferred equity investment
Debt and preferred equity investments	158,584,000		158,584,000		144,210,000	158,584,000
Total floating rate \| Three Mortgage Investments
Preferred equity investment
Debt and preferred equity investments	$ 88,800,000		$ 88,800,000			$ 88,800,000
Total floating rate \| Mortgage Investment One
Preferred equity investment
Debt and preferred equity investments					$ 6,900,000

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Assets
Debt and preferred equity investments, discount and deferred origination fees	$ 1,638	$ 1,811
Allowance for loan and lease losses, real estate	$ 13,520	$ 6,630
Equity
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)	65,458,000	65,440,000
Common stock, shares outstanding (in shares)	65,458,000	65,440,000
Treasury stock, shares (in shares)	1,060,000	1,060,000
Land and land interests	$ 1,090,370	$ 1,576,927
Building and improvements	3,605,247	4,903,776
Building leasehold and improvements	1,343,386	1,691,831
Right of use asset - operating leases	953,236	1,026,265
Accumulated depreciation	1,997,942	2,039,554
Other assets	472,071	546,945
Mortgages and other loans payable, net	1,512,746	3,227,563
Lease liability - financing leases	105,198	104,218
Other liabilities	453,349	236,211
Service Corporation
Equity
Land and land interests	41,200	41,200
Building and improvements	39,800	41,000
Building leasehold and improvements	0	0
Right of use asset - operating leases	0	0
Accumulated depreciation	5,200	4,400
Other assets	664,100	599,200
Mortgages and other loans payable, net	50,000	49,800
Accrued interest payable	0	200
Lease liability - financing leases	0	0
Other liabilities	$ 304,700	$ 146,400
Series I Preferred Stock
Equity
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

Partners' Capital of the Operating Partnership

9 Months Ended

Sep. 30, 2023

Equity [Abstract]

Partners' Capital of the Operating Partnership

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 September 30, 2023, 64,397,983 shares of common stock and no shares of excess stock were issued and outstanding.

Share Repurchase Program

In August 2016, our Board of Directors approved a $1.0 billion share repurchase program under which we can buy shares of our common stock. The Board of Directors has since authorized five separate $500.0 million increases to the size of the share repurchase program in the fourth quarter of 2017, second quarter of 2018, fourth quarter of 2018, fourth quarter of 2019, and fourth quarter of 2020 bringing the total program size to $3.5 billion.

As of September 30, 2023, share repurchases executed under the program, excluding the redemption of OP units, were as follows:


Period	Shares repurchased(1)	Average price paid per share	Cumulative number of shares repurchased as part of the repurchase plan or programs
Year ended 2020	8,276,032	$64.30	29,661,978
Year ended 2021	4,474,649	$75.44	34,136,627
Year ended 2022	1,971,092	$76.69	36,107,719

(1)There were no share repurchases during the nine months ended September 30, 2023.

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 any time, in whole or from time to time in part, at par for cash. 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 ("DRSPP")

In February 2021, 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 our common stock under the DRSPP. The DRSPP commenced on September 24, 2001.

The following table summarizes SL Green common stock issued, and proceeds received from dividend reinvestments and/or stock purchases under the DRSPP for the three and nine months ended September 30, 2023 and 2022, respectively (dollars in thousands):


	Three Months Ended September 30,				Nine Months Ended September 30,
	2023		2022		2023		2022
Shares of common stock issued	2,695		2,933		14,736		5,827
Dividend reinvestments/stock purchases under the DRSPP	$	97	$	140	$	439	$	339

Earnings per Share

We use the two-class method of computing earnings per share (“EPS”), which is an earnings allocation formula that determines EPS for common stock and any participating securities according to dividends declared (whether paid or unpaid). Under the two-class method, basic EPS is computed by dividing the income available to common stockholders by the weighted-average number of common stock shares outstanding for the period. Diluted EPS reflects the potential dilution that could occur from share equivalent activity.

SL Green's earnings per share for the three and nine months ended September 30, 2023 and 2022 are computed as follows (in thousands):


	Three Months Ended September 30,				Nine Months Ended September 30,
Numerator	2023		2022		2023		2022
Basic Earnings:
(Loss) income attributable to SL Green common stockholders	$	(23,967)	$	7,377	$	(423,892)	$	(28,748)
Less: distributed earnings allocated to participating securities	(408)		(505)		(1,225)		(1,516)

Net (loss) income attributable to SL Green common stockholders (numerator for basic earnings per share)	$	(24,375)	$	6,872	$	(425,117)	$	(30,264)
Add back: dilutive effect of earnings allocated to participating securities and contingently issuable shares	—		505		—		(484)

Add back: effect of dilutive securities (redemption of units to common shares)	(1,574)		491		(27,493)		(1,831)
Net (loss) income attributable to SL Green common stockholders (numerator for diluted earnings per share)	$	(25,949)	$	7,868	$	(452,610)	$	(32,579)


	Three Months Ended September 30,		Nine Months Ended September 30,
Denominator	2023	2022	2023	2022
Basic Shares:
Weighted average common stock outstanding	64,114	63,949	64,099	63,971
Effect of Dilutive Securities:
Operating Partnership units redeemable for common shares	4,182	4,088	4,175	4,104
Stock-based compensation plans	—	860	—	1,052
Contingently issuable shares	—	—	—	122
Diluted weighted average common stock outstanding	68,296	68,897	68,274	69,249

The Company has excluded 1,402,771 and 1,380,364 common stock equivalents from the calculation of diluted shares outstanding for the three and nine months ended September 30, 2023, respectively, as they were anti-dilutive. The Company has excluded 621,134 and 517,574 common stock equivalents from the calculation of diluted shares outstanding for the three and nine months ended September 30, 2022, respectively, as they were anti-dilutive.

Partners' Capital of the Operating Partnership

The Company is the sole managing general partner of the Operating Partnership and at September 30, 2023 owned 64,397,983 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 September 30, 2023, limited partners other than SL Green owned 6.04%, or 4,139,334 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 nine months ended September 30, 2023 and 2022, respectively, are computed as follows (in thousands):


	Three Months Ended September 30,				Nine Months Ended September 30,
Numerator	2023		2022		2023		2022
Basic Earnings:
Net (loss) income attributable to SLGOP common unitholders (numerator for diluted earnings per unit)	$	(25,541)	$	7,868	$	(451,385)	$	(30,579)
Less: distributed earnings allocated to participating securities	(408)		(505)		(1,225)		(1,516)

Net (loss) income attributable to SLGOP common unitholders (numerator for basic earnings per unit)	$	(25,949)	$	7,363	$	(452,610)	$	(32,095)
Add back: dilutive effect of earnings allocated to participating securities and contingently issuable shares	—		505		—		(484)

Net (loss) income attributable to SLGOP common unitholders (numerator for diluted earnings per unit)	$	(25,949)	$	7,868	$	(452,610)	$	(32,579)


	Three Months Ended September 30,		Nine Months Ended September 30,
Denominator	2023	2022	2023	2022
Basic units:
Weighted average common units outstanding	68,296	68,037	68,274	68,075
Effect of Dilutive Securities:
Stock-based compensation plans	—	860	—	1,052
Contingently issuable units	—	—	—	122
Diluted weighted average common units outstanding	68,296	68,897	68,274	69,249

The Operating Partnership has excluded 1,402,771 and 1,380,364 common unit equivalents from the diluted units outstanding for the three and nine months ended September 30, 2023, respectively, as they were anti-dilutive. The Operating Partnership has excluded 621,134 and 517,574 common unit equivalents from the diluted units outstanding for the three and nine months ended September 30, 2022, respectively, as they were anti-dilutive.

Accumulated Other Comprehensive Income

The following tables set forth the changes in accumulated other comprehensive income by component as of September 30, 2023 (in thousands):


	Net unrealized gain (loss) on derivative instruments (1)		SL Green’s share of joint venture net unrealized gain (loss) on derivative instruments (2)		Net unrealized loss on marketable securities		Total
Balance at December 31, 2022	$	47,800	$	2,046	$	(242)	$	49,604
Other comprehensive income before reclassifications	49,326		12,649		(1,525)		60,450
Amounts reclassified from accumulated other comprehensive income	(29,175)		(11,263)		—		(40,438)
Balance at September 30, 2023	$	67,951	$	3,432	$	(1,767)	$	69,616

(1)Amount reclassified from accumulated other comprehensive income is included in interest expense in the respective consolidated statements of operations. As of September 30, 2023 and December 31, 2022, the deferred net gains from these terminated hedges, which is included in accumulated other comprehensive income relating to net unrealized gain (loss) on derivative instruments, was ($0.4 million)and ($0.5 million), respectively.

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

- Definition

The entire disclosure for equity.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481112/505-10-50-13

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (h)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481112/505-10-50-13

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 14
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481112/505-10-50-14

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 235
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481062/946-235-50-2

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 235
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481062/946-235-50-2

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 505
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481004/946-505-50-6

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480237/815-40-50-6

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480008/505-10-S99-1

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(e)(1))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1

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+ Details

Fair Value Measurements

9 Months Ended

Sep. 30, 2023

Fair Value Disclosures [Abstract]

Fair Value Measurements

We are required to disclose fair value information with regard to certain of 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 certain 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 as of September 30, 2023 and December 31, 2022 (in thousands):


	September 30, 2023
	Total		Level 1		Level 2		Level 3
Assets:
Marketable securities available-for-sale	$	9,616	$	—	$	9,616	$	—
Interest rate cap and swap agreements (included in Other assets)	77,921		—		77,921		—
Liabilities:
Interest rate cap and swap agreements (included in Other liabilities)	$	5,968	$	—	$	5,968	$	—


	December 31, 2022
	Total		Level 1		Level 2		Level 3
Assets:
Marketable securities available-for-sale	$	11,240	$	—	$	11,240	$	—
Interest rate cap and swap agreements (included in Other assets)	57,660		—		57,660		—
Liabilities:
Interest rate cap and swap agreements (included in Other liabilities)	$	10,142	$	—	$	10,142	$	—

We evaluate real estate investments and debt and preferred equity investments, including intangibles, for potential impairment primarily utilizing cash flow projections that apply, among other things, estimated revenue and expense growth rates, discount rates and capitalization rates, as well as sales comparison approach, which utilizes comparable sales, listings and sales contracts. All of which are classified as Level 3 inputs.

In June 2023, the Company sold a 49.9% interest in its 245 Park Avenue investment, which resulted in the Company no longer retaining a controlling interest in the entity, as defined in ASC 810, and deconsolidation of the 50.1% interest we retained. We recorded our investment at fair value which resulted in the recognition of a fair value adjustment of ($17.0 million) during the three and nine months ended September 30, 2023. The fair value of our investment was determined by the terms of the joint venture agreement.

Marketable securities classified as Level 1 are derived from quoted prices in active markets. The valuation technique used to measure the fair value of 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. 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 instrument 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 September 30, 2023 and December 31, 2022 (in thousands):


	September 30, 2023				December 31, 2022
	Carrying Value (1)		Fair Value		Carrying Value (1)		Fair Value

Debt and preferred equity investments	$	334,327	(2)		$	623,280	(2)

Fixed rate debt	$	3,248,724	$	3,188,552	$	5,015,814	$	4,784,691
Variable rate debt	120,148		118,264		520,148		519,669
	$	3,368,872	$	3,306,816	$	5,535,962	$	5,304,360

(1)Amounts exclude net deferred financing costs.

(2)As of September 30, 2023, debt and preferred equity investments had an estimated fair value ranging between $0.3 billion and $0.3 billion. As of December 31, 2022, debt and preferred equity investments had an estimated fair value ranging between $0.6 billion and $0.6 billion.

Disclosures regarding fair value of financial instruments was based on pertinent information available to us as of September 30, 2023 and December 31, 2022. 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

Debt and Preferred Equity Investments - Investment In Financing Receivable (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items]
2023	$ 0
2022	0
2021	0
Prior	334,327
Carrying value	334,327	$ 623,280
Provision for loan loss related to an investment originated prior to 2021	6,900
1 - Low Risk Assets - Low probability of loss
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0
2022	0
2021	0
Prior	207,156
Carrying value	207,156	264,069
2 - Watch List Assets - Higher potential for loss
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0
2022	0
2021	0
Prior	127,171
Carrying value	127,171	352,321
3 - High Risk Assets - Loss more likely than not
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0
2022	0
2021	0
Prior	0
Carrying value	$ 0	$ 6,890

Stockholders' Equity of the Company - Schedule of Common Stock Issued and Proceeds Received Dividend Reinvestments (Details) - Dividend Reinvestment and Stock Purchase Plan (DRIP) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Stockholders' Equity
Shares of common stock issued (in shares)	2,695	2,933	14,736	5,827
Dividend reinvestments/stock purchases under the DRSPP	$ 97	$ 140	$ 439	$ 339

Consolidated Statements of Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid- In-Capital	Treasury Stock	Accumulated Other Comprehensive Income	Retained Earnings	Noncontrolling Interests	Series I Preferred Stock Series I Preferred Stock
Beginning balance at Dec. 31, 2021	$ 4,778,253	$ 672	$ 3,739,409	$ (126,160)	$ (46,758)	$ 975,781	$ 13,377	$ 221,932
Beginning balance (in shares) at Dec. 31, 2021		64,105
Increase (Decrease) in Stockholders' Equity
Net income (loss)	(15,266)					(17,535)	2,269
Acquisition of subsidiary interest from noncontrolling interest	(29,817)		(29,742)				(75)
Other comprehensive income	104,332				104,332
Preferred dividends	(11,213)					(11,213)
DRSPP proceeds (in shares)		6
DRSPP proceeds	339		339
Reallocation of noncontrolling interest in the Operating Partnership	23,539					23,539
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings (in shares)		215
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings	22,147	$ 3	22,144
Repurchases of common stock (in shares)		(1,971)
Repurchases of common stock	(151,197)	$ (20)	(114,979)			(36,198)
Contribution to consolidated joint venture interests	52,164						52,164
Cash distributions to noncontrolling interests	(3,168)						(3,168)
Issuance of special dividend paid primarily in stock (in shares)		1,961
Issuance of special dividend paid primarily in stock	160,620		163,115	(2,495)
Cash distributions declared	(178,512)					(178,512)
Ending balance at Sep. 30, 2022	4,752,221	$ 655	3,780,286	(128,655)	57,574	755,862	64,567	221,932
Ending balance (in shares) at Sep. 30, 2022		64,316
Beginning balance at Dec. 31, 2021	4,778,253	$ 672	3,739,409	(126,160)	(46,758)	975,781	13,377	221,932
Beginning balance (in shares) at Dec. 31, 2021		64,105
Ending balance at Dec. 31, 2022	4,646,922	$ 656	3,790,358	(128,655)	49,604	651,138	61,889	221,932
Ending balance (in shares) at Dec. 31, 2022		64,380
Beginning balance at Jun. 30, 2022	4,748,764	$ 655	3,801,272	(128,655)	8,595	779,999	64,966	221,932
Beginning balance (in shares) at Jun. 30, 2022		64,302
Increase (Decrease) in Stockholders' Equity
Net income (loss)	10,122					11,115	(993)
Acquisition of subsidiary interest from noncontrolling interest	(29,817)		(29,742)				(75)
Other comprehensive income	48,979				48,979
Preferred dividends	(3,738)					(3,738)
DRSPP proceeds (in shares)		3
DRSPP proceeds	140		140
Reallocation of noncontrolling interest in the Operating Partnership	28,624					28,624
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings (in shares)		11
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings	8,616		8,616
Contribution to consolidated joint venture interests	817						817
Cash distributions to noncontrolling interests	(148)						(148)
Cash distributions declared	(60,138)					(60,138)
Ending balance at Sep. 30, 2022	4,752,221	$ 655	3,780,286	(128,655)	57,574	755,862	64,567	221,932
Ending balance (in shares) at Sep. 30, 2022		64,316
Beginning balance at Dec. 31, 2022	4,646,922	$ 656	3,790,358	(128,655)	49,604	651,138	61,889	221,932
Beginning balance (in shares) at Dec. 31, 2022		64,380
Increase (Decrease) in Stockholders' Equity
Net income (loss)	(417,138)					(412,679)	(4,459)
Other comprehensive income	20,012				20,012
Preferred dividends	(11,213)					(11,213)
DRSPP proceeds (in shares)		15
DRSPP proceeds	439		439
Reallocation of noncontrolling interest in the Operating Partnership	(8,072)					(8,072)
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings (in shares)		3
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings	22,961		22,961
Contribution to consolidated joint venture interests	11,714						11,714
Cash distributions to noncontrolling interests	(1,614)						(1,614)
Cash distributions declared	(156,768)					(156,768)
Ending balance at Sep. 30, 2023	4,107,243	$ 656	3,813,758	(128,655)	69,616	62,406	67,530	221,932
Ending balance (in shares) at Sep. 30, 2023		64,398
Beginning balance at Jun. 30, 2023	4,159,833	$ 656	3,805,704	(128,655)	57,769	135,518	66,909	221,932
Beginning balance (in shares) at Jun. 30, 2023		64,387
Increase (Decrease) in Stockholders' Equity
Net income (loss)	(22,023)					(20,229)	(1,794)
Other comprehensive income	11,847				11,847
Preferred dividends	(3,738)					(3,738)
DRSPP proceeds (in shares)		3
DRSPP proceeds	97		97
Reallocation of noncontrolling interest in the Operating Partnership	3,126					3,126
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings (in shares)		8
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings	7,957		7,957
Contribution to consolidated joint venture interests	3,266						3,266
Cash distributions to noncontrolling interests	(851)						(851)
Cash distributions declared	(52,271)					(52,271)
Ending balance at Sep. 30, 2023	$ 4,107,243	$ 656	$ 3,813,758	$ (128,655)	$ 69,616	$ 62,406	$ 67,530	$ 221,932
Ending balance (in shares) at Sep. 30, 2023		64,398

Stockholders' Equity of the Company - Earnings per Share (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Basic Earnings:
(Loss) income attributable to SL Green common stockholders	$ (23,967)	$ 7,377	$ (423,892)	$ (28,748)
Less: distributed earnings allocated to participating securities	(408)	(505)	(1,225)	(1,516)
Net (loss) income attributable to SLGOP common unitholders (numerator for basic earnings per unit)	(24,375)	6,872	(425,117)	(30,264)
Effect of Dilutive Securities:
Add back: dilutive effect of earnings allocated to participating securities and contingently issuable shares	0	505	0	(484)
Add back: effect of dilutive securities (redemption of units to common shares)	(1,574)	491	(27,493)	(1,831)
Diluted Earnings:
Net (loss) income attributable to SL Green common stockholders, diluted	$ (25,949)	$ 7,868	$ (452,610)	$ (32,579)
Basic Shares:
Weighted average common shares outstanding (shares)	64,114,000	63,949,000	64,099,000	63,971,000
Effect of Dilutive Securities:
Operating Partnership units redeemable for common shares (shares)	4,182,000	4,088,000	4,175,000	4,104,000
Stock-based compensation plans (shares)	0	860,000	0	1,052,000
Contingently issuable shares (in shares)	0	0	0	122,000
Diluted weighted average common stock outstanding (shares)	68,296,000	68,897,000	68,274,000	69,249,000
Common stock shares excluded from the diluted shares outstanding (shares)	1,402,771	621,134	1,380,364	517,574

Corporate Indebtedness - Junior Subordinated Deferrable Interest Debentures and Principal Maturities (Details)	1 Months Ended
	Jun. 30, 2005 USD ($) quarter	Sep. 30, 2023 USD ($)
Principal Repayments and Joint Venture Debt
Remaining 2023		$ 261,635,000
2024		537,237,000
2025		470,000,000
2026		0
2027		1,950,000,000
Thereafter		150,000,000
Total principal repayments		3,368,872,000
Trust Preferred Securities
Debt Instrument [Line Items]
Proceeds from issuance of debt	$ 100,000,000
SOFR \| Trust Preferred Securities
Debt Instrument [Line Items]
Interest rate added to base rate (as a percent)	0.26%
Interest payment deferment, number of consecutive quarters \| quarter	8
Joint venture
Principal Repayments and Joint Venture Debt
Remaining 2023		525,028,000
2024		1,318,885,000
2025		1,618,381,000
2026		563,977,000
2027		1,189,059,000
Thereafter		2,130,404,000
Total principal repayments		7,345,734,000
Joint venture \| Trust Preferred Securities
Principal Repayments and Joint Venture Debt
Remaining 2023		0
2024		0
2025		0
2026		0
2027		0
Thereafter		100,000,000
Total principal repayments		100,000,000
Joint venture \| Mortgages and other loans payable
Scheduled Amortization
Remaining 2023		1,486,000
2024		4,488,000
2025		0
2026		0
2027		0
Thereafter		0
Total amortization of debt		5,974,000
Principal Repayments and Joint Venture Debt
Remaining 2023		260,149,000
2024		332,749,000
2025		370,000,000
2026		0
2027		550,000,000
Thereafter		0
Total principal repayments		1,512,898,000
Joint venture \| Revolving Credit Facility
Principal Repayments and Joint Venture Debt
Remaining 2023		0
2024		0
2025		0
2026		0
2027		400,000,000
Thereafter		0
Total principal repayments		400,000,000
Joint venture \| Unsecured Term Loans
Principal Repayments and Joint Venture Debt
Remaining 2023		0
2024		200,000,000
2025		0
2026		0
2027		1,000,000,000
Thereafter		50,000,000
Total principal repayments		1,250,000,000
Joint venture \| Senior Unsecured Notes
Principal Repayments and Joint Venture Debt
Remaining 2023		0
2024		0
2025		100,000,000
2026		0
2027		0
Thereafter		0
Total principal repayments		$ 100,000,000

Consolidated Statements of Capital (Parenthetical) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Cash distributions declared (per common unit, none of which represented a return of capital for federal income tax purposes) (in dollars per share)	$ 0.812	$ 0.932	$ 2.437	$ 2.797
SL Green Operating Partnership
Cash distributions declared (per common unit, none of which represented a return of capital for federal income tax purposes) (in dollars per share)	$ 0.812	$ 0.932	$ 2.437	$ 2.797

Share-based Compensation

9 Months Ended

Sep. 30, 2023

Share-Based Payment Arrangement [Abstract]

Share-based Compensation

We have share-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.

The Fifth Amended and Restated 2005 Stock Option and Incentive Plan, or the 2005 Plan, was approved by the Company's Board of Directors in April 2022 and its stockholders in June 2022 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 32,210,000 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) counting as 2.59 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 0.84 fungible units per share subject to such awards, and (3) all other awards (e.g., 10-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 fifth amendment and restatement in June 2022 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 32,210,000 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 our 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 1, 2032, which is the tenth anniversary of the date that the 2005 Plan was most recently approved by the Company's stockholders. As of September 30, 2023, 4.0 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.

Stock Options and Class O LTIP Units

Options are granted with an exercise price at the fair market value of the Company's common stock on the date of grant and, subject to employment, generally expire five years or ten years from the date of grant, are not transferable other than on death, and generally vest in one year to five years commencing one year from the date of grant. We have also granted Class O LTIP Units, which are a class of LTIP Units in the Operating Partnership structured to provide economics similar to those of stock options. Class O LTIP Units, once vested, may be converted, at the election of the holder, into a number of common units of the Operating Partnership per Class O LTIP Unit determined by the increase in value of a share of the Company’s common stock at the time of conversion over a participation threshold, which equals the fair market value of a share of the Company’s common stock at the time of grant. Class O LTIP Units are entitled to distributions, subject to vesting, equal per unit to 10% of the per unit distributions paid with respect to the common units of the Operating Partnership.

The fair value of each stock option or LTIP Unit granted is estimated on the date of grant using the Black-Scholes option pricing model based on historical information. There were no options granted during the nine months ended September 30, 2023 or the year ended December 31, 2022.

A summary of the status of the Company's stock options as of September 30, 2023 and December 31, 2022, and changes during the nine months ended September 30, 2023 and year ended December 31, 2022 are as follows:


	September 30, 2023			December 31, 2022
	Options Outstanding	Weighted Average Exercise Price		Options Outstanding	Weighted Average Exercise Price
Balance at beginning of period	313,480	$	97.59	394,089	$	100.56

Exercised	—	—		—	—
Lapsed or canceled	(120,000)	79.56		(80,609)	112.14
Balance at end of period	193,480	$	99.03	313,480	$	97.59
Options exercisable at end of period	193,480	$	99.03	313,480	$	97.59

The remaining weighted average contractual life of the options outstanding was 2.1 years and the remaining average contractual life of the options exercisable was 2.1 years.

During the three and nine months ended September 30, 2023, we recognized no compensation expense related to options. During the three and nine months ended September 30, 2022, we recognized no compensation expense related to options. As of September 30, 2023, there was no unrecognized compensation cost related to unvested stock options.

Restricted Shares

Shares are granted to certain employees, including our executives, and vesting occurs upon the completion of a service period or our meeting established financial performance criteria. Vesting occurs at rates ranging from 15% to 35% once performance criteria are reached.

A summary of the Company's restricted stock as of September 30, 2023 and December 31, 2022 and changes during the nine months ended September 30, 2023 and the year ended December 31, 2022, are as follows:


	September 30, 2023		December 31, 2022
Balance at beginning of period	3,758,174		3,459,363
Granted	13,000		314,995
Canceled	(1,650)		(16,184)
Balance at end of period	3,769,524		3,758,174
Vested during the period	145,415		118,255
Compensation expense recorded	$	5,782,841	$	10,133,905
Total fair value of restricted stock granted during the period	$	483,860	$	16,804,931

The fair value of restricted stock that vested during the nine months ended September 30, 2023 and the year ended December 31, 2022 was $10.0 million and $9.7 million, respectively. As of September 30, 2023, there was $7.1 million of total unrecognized compensation cost related to restricted stock, which is expected to be recognized over a weighted average period of 1.5 years.

We granted LTIP Units, which include bonus, time-based and performance-based awards, with a fair value of $37.9 million and $45.0 million as of September 30, 2023 and December 31, 2022, respectively. The grant date fair value of the LTIP Unit awards was calculated in accordance with ASC 718. A third-party consultant determined that the fair value of the LTIP Units has a discount to our 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 September 30, 2023, there was $50.5 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 1.6 years.

During the three and nine months ended September 30, 2023, we recorded compensation expense related to bonus, time-based and performance-based awards of $10.6 million and $31.2 million, respectively. During the three and nine months ended September 30, 2022, we recorded compensation expense related to bonus, time-based and performance-based awards of $10.1 million and $30.5 million, respectively.

For the three and nine months ended September 30, 2023, $0.3 million and $1.0 million, respectively, was capitalized to assets associated with compensation expense related to our long-term compensation plans, restricted stock and stock options. For the three and nine months ended September 30, 2022, $0.5 million and $1.4 million, respectively, was capitalized to assets associated with compensation expense related to our long-term compensation plans, restricted stock and stock options.

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 our 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 nine months ended September 30, 2023, 37,112 phantom stock units and 27,739 shares of common stock were issued to our Board of Directors. We recorded compensation expense of $0.2 million and $2.5 million during the three and nine months ended September 30, 2023, respectively, related to the Deferred Compensation Plan. We recorded compensation expense of $0.2 million and $2.4 million during the three and nine months ended September 30, 2022, respectively, related to the Deferred Compensation Plan.

As of September 30, 2023, there were 228,105 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 provide 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 September 30, 2023, 217,081 shares of our common stock had been issued under the ESPP.

Debt and Preferred Equity Investments - Debt Investment (Details) - USD ($)	8 Months Ended	9 Months Ended	38 Months Ended	39 Months Ended
	Sep. 30, 2023	Sep. 30, 2023	Sep. 30, 2023	Sep. 30, 2023	Dec. 31, 2022	Dec. 31, 2021
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Aggregate weighted average current yield (as a percent)		9.15%
Debt Investments Held [Abstract]
Carrying Value, Fixed Rate	$ 334,327,000	$ 334,327,000	$ 334,327,000	$ 334,327,000	$ 623,280,000
Carrying Value	334,327,000	334,327,000	334,327,000	334,327,000	623,280,000
Allowance for loan loss	$ (13,520,000)	$ (13,520,000)	(13,520,000)	$ (13,520,000)	(6,630,000)	$ (6,630,000)
Loan interest income			$ 0
A Fund Affiliated With Winthrop Capital Partners \| 625 Madison Avenue \| Joint venture
Debt Investments Held [Abstract]
Ownership Interest	90.43%	90.43%	90.43%	90.43%
Debt Investments in Mortgage Loans
Debt Investments Held [Abstract]
Future Funding Obligations	$ 7,484,000	$ 7,484,000	$ 7,484,000	$ 7,484,000
Senior Financing	1,069,704,000	1,069,704,000	1,069,704,000	1,069,704,000
Carrying Value	208,430,000	208,430,000	208,430,000	208,430,000	503,422,000
Allowance for loan loss	(13,520,000)	(13,520,000)	(13,520,000)	(13,520,000)	(6,630,000)
Mezzanine Loan Due June 2024
Debt Investments Held [Abstract]
Amount participated out	12,000,000	12,000,000	12,000,000	12,000,000
Loan interest income				0
Total fixed rate
Debt Investments Held [Abstract]
Future Funding Obligations	0	0	0	0
Senior Financing	285,000,000	285,000,000	285,000,000	285,000,000
Carrying Value, Fixed Rate	63,366,000	63,366,000	63,366,000	63,366,000	365,842,000
Total fixed rate \| Mezzanine Loan Due June 2024
Debt Investments Held [Abstract]
Future Funding Obligations	0	0	0	0
Senior Financing	105,000,000	105,000,000	105,000,000	105,000,000
Carrying Value, Fixed Rate	13,366,000	13,366,000	13,366,000	13,366,000	13,366,000
Total fixed rate \| Mezzanine Loan, with an Initial Maturity Date of January 2025
Debt Investments Held [Abstract]
Future Funding Obligations	0	0	0	0
Senior Financing	95,000,000	95,000,000	95,000,000	95,000,000
Carrying Value, Fixed Rate	30,000,000	30,000,000	30,000,000	30,000,000	30,000,000
Total fixed rate \| Mezzanine Loan With Initial Maturity Date of December 2029
Debt Investments Held [Abstract]
Future Funding Obligations	0	0	0	0
Senior Financing	85,000,000	85,000,000	85,000,000	85,000,000
Carrying Value, Fixed Rate	20,000,000	20,000,000	20,000,000	20,000,000	20,000,000
Total fixed rate \| Mezzanine Loan Repaid
Debt Investments Held [Abstract]
Future Funding Obligations	0	0	0	0
Senior Financing	0	0	0	0
Carrying Value, Fixed Rate	0	0	0	0	225,367,000
Total fixed rate \| Mezzanine Loan Repaid - 2
Debt Investments Held [Abstract]
Future Funding Obligations	0	0	0	0
Senior Financing	0	0	0	0
Carrying Value, Fixed Rate	0	0	0	0	77,109,000
Total floating rate
Debt Investments Held [Abstract]
Future Funding Obligations	7,484,000	7,484,000	7,484,000	7,484,000
Senior Financing	784,704,000	784,704,000	784,704,000	784,704,000
Carrying Value	158,584,000	158,584,000	158,584,000	158,584,000	144,210,000
Total floating rate \| Mezzanine Loan Due April 2023
Debt Investments Held [Abstract]
Future Funding Obligations	0	0	0	0
Senior Financing	275,000,000	275,000,000	275,000,000	275,000,000
Carrying Value	50,000,000	50,000,000	50,000,000	50,000,000	50,000,000
Loan interest income	0
Total floating rate \| Mezzanine Loan Due November 2023
Debt Investments Held [Abstract]
Future Funding Obligations	3,761,000	3,761,000	3,761,000	3,761,000
Senior Financing	54,000,000	54,000,000	54,000,000	54,000,000
Carrying Value	8,243,000	8,243,000	8,243,000	8,243,000	8,243,000
Total floating rate \| Mezzanine Loan Due May 2024
Debt Investments Held [Abstract]
Future Funding Obligations	3,723,000	3,723,000	3,723,000	3,723,000
Senior Financing	269,620,000	269,620,000	269,620,000	269,620,000
Carrying Value	61,258,000	61,258,000	61,258,000	61,258,000	46,884,000
Total floating rate \| Mezzanine Loan Due January 2026
Debt Investments Held [Abstract]
Future Funding Obligations	0	0	0	0
Senior Financing	186,084,000	186,084,000	186,084,000	186,084,000
Carrying Value	$ 39,083,000	$ 39,083,000	$ 39,083,000	$ 39,083,000	$ 39,083,000

Financial Instruments: Derivatives and Hedging

9 Months Ended

Sep. 30, 2023

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, collars 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 sheet 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 (loss) until the hedged item is 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 as of September 30, 2023 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 (dollars in thousands).


	Notional Value		Strike Rate		Effective Date	Expiration Date	Balance Sheet Location	Fair Value
Interest Rate Swap	$	200,000	4.739	%	November 2022	November 2023	Other Assets	$	149
Interest Rate Cap	196,717		3.500	%	November 2022	November 2023	Other Assets	449
Interest Rate Cap	196,717		3.500	%	November 2022	November 2023	Other Liabilities	(449)
Interest Rate Swap	150,000		2.600	%	December 2021	January 2024	Other Assets	1,061
Interest Rate Swap	200,000		4.490	%	November 2022	January 2024	Other Assets	447
Interest Rate Swap	200,000		4.411	%	November 2022	January 2024	Other Assets	488
Interest Rate Cap	370,000		3.250	%	June 2023	June 2024	Other Assets	5,526
Interest Rate Cap	370,000		3.250	%	June 2023	June 2024	Other Liabilities	(5,519)
Interest Rate Swap	150,000		2.621	%	December 2021	January 2026	Other Assets	6,885
Interest Rate Swap	200,000		2.662	%	December 2021	January 2026	Other Assets	9,035
Interest Rate Swap	100,000		2.903	%	February 2023	February 2027	Other Assets	4,896
Interest Rate Swap	100,000		2.733	%	February 2023	February 2027	Other Assets	5,422
Interest Rate Swap	50,000		2.463	%	February 2023	February 2027	Other Assets	3,130
Interest Rate Swap	200,000		2.591	%	February 2023	February 2027	Other Assets	11,727
Interest Rate Swap	300,000		2.866	%	July 2023	May 2027	Other Assets	15,663
Interest Rate Swap	150,000		3.524	%	January 2024	May 2027	Other Assets	3,850
Interest Rate Swap	370,000		3.888	%	November 2022	June 2027	Other Assets	6,757
Interest Rate Swap	100,000		3.756	%	January 2023	January 2028	Other Assets	2,436
								$	71,953

During the three and nine months ended September 30, 2023, we recorded losses of $0.0 million and $0.2 million, respectively, based on the changes in the fair value of an interest rate cap we sold, which is included in Purchase price and other fair value adjustments in the consolidated statements of operations. During both the three and nine months ended September 30, 2022, we recorded a loss of $1.3 million based on the changes in the fair value of an interest rate cap we sold, which is included in Purchase price and other fair value adjustments in the consolidated statements of operations. During the three and nine months ended September 30, 2023, we recorded losses of $0.0 million and $0.2 million, respectively, on the changes in fair value, which is included in interest expense in the consolidated statements of operations. No gains or losses on the changes in fair value were included in interest expense in the consolidated statements of operations during the three and nine months ended September 30, 2022.

Certain agreements the Company has with each of its derivative counterparties contain a provision where if the Company defaults on any of its indebtedness, then the Company could also be declared in default on its derivative obligations. As of September 30, 2023, 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 $6.6 million. As of September 30, 2023, the Company was not required to post 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 $6.6 million as of September 30, 2023.

Gains and losses on terminated hedges are included in accumulated other comprehensive income, and are recognized into earnings over the term of the related obligation. Over time, the realized and unrealized gains and losses held in accumulated other comprehensive income 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 ($46.8 million) of the current balance held in accumulated other comprehensive income will be reclassified into interest expense and ($13.8 million) of the portion related to our share of joint venture accumulated other comprehensive income will be reclassified into equity in net loss 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 September 30, 2023 and 2022, respectively (in thousands):


	Amount of Gain Recognized in Other Comprehensive (Loss) Income				Location of Gain Reclassified from Accumulated Other Comprehensive Income into Income	Amount of Gain Reclassified from Accumulated Other Comprehensive Income into Income
	Three Months Ended September 30,					Three Months Ended September 30,
Derivative	2023		2022				2023		2022
Interest Rate Swaps/Caps	$	24,910	$	44,057		Interest expense	$	11,422	$	3,061
Share of unconsolidated joint ventures' derivative instruments	3,927		9,354			Equity in net loss from unconsolidated joint ventures	4,616		(138)
	$	28,837	$	53,411			$	16,038	$	2,923

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 nine months ended September 30, 2023 and 2022, respectively (in thousands):


	Amount of Gain Recognized in Other Comprehensive (Loss) Income				Location of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income	Amount of Gain Reclassified from Accumulated Other Comprehensive Income into Income
	Nine Months Ended September 30,					Nine Months Ended September 30,
Derivative	2023		2022				2023		2022
Interest Rate Swaps/Caps	$	52,624	$	83,768		Interest expense	$	31,043	$	(2,673)
Share of unconsolidated joint ventures' derivative instruments	13,467		22,951			Equity in net loss from unconsolidated joint ventures	11,986		(1,986)
	$	66,091	$	106,719			$	43,029	$	(4,659)

The following table summarizes the notional value at inception and fair value of our joint ventures' derivative financial instruments as of September 30, 2023 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 (dollars in thousands).


	Notional Value		Strike Rate		Effective Date	Expiration Date	Classification	Fair Value
Interest Rate Cap	$	220,000	4.000	%	February 2023	February 2024	Asset	$	1,097
Interest Rate Cap	410,070		0.490	%	February 2022	May 2024	Asset	14,040
Interest Rate Cap	410,070		0.490	%	February 2022	May 2024	Asset	14,035
Interest Rate Cap	505,412		3.000	%	June 2023	June 2024	Asset	8,524
Interest Rate Cap	272,000		4.000	%	August 2023	August 2024	Asset	3,176
Interest Rate Cap	434,816		3.500	%	September 2023	September 2024	Asset	8,781
Interest Rate Swap	250,000		3.608	%	April 2023	February 2026	Asset	6,305
Interest Rate Swap	250,000		3.608	%	April 2023	February 2026	Asset	6,299
Interest Rate Swap	177,000		1.555	%	December 2022	February 2026	Asset	12,655
								$	74,912

Cover Page - shares	9 Months Ended
Cover Page - shares	Sep. 30, 2023	Nov. 02, 2023
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2023
Document Transition Report	false
Entity File Number	1-13199
Entity Registrant Name	SL GREEN REALTY CORP
Entity Incorporation, State or Country Code	MD
Entity Tax Identification Number	13-3956775
Entity Address, Address Line One	One Vanderbilt Avenue
Entity Address, City or Town	New York
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	10017
City Area Code	212
Local Phone Number	594-2700
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		64,416,699
Entity Central Index Key	0001040971
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q3
Amendment Flag	false
Common Stock
Document Information [Line Items]
Trading Symbol	SLG
Title of 12(b) Security	Common Stock, $0.01 par value
Security Exchange Name	NYSE
Series I Preferred Stock
Document Information [Line Items]
Trading Symbol	SLG.PRI
Title of 12(b) Security	6.500% Series I Cumulative Redeemable Preferred Stock, $0.01 par value
Security Exchange Name	NYSE
SL Green Operating Partnership
Document Information [Line Items]
Entity File Number	33-167793-02
Entity Registrant Name	SL GREEN OPERATING PARTNERSHIP, L.P.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	13-3960938
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		306,808
Entity Central Index Key	0001492869
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q3
Amendment Flag	false

Partners' Capital of the Operating Partnership - Additional Information (Details) - shares	9 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021
Common Stock
Stockholders' Equity
Units outstanding (units)	64,398,000	64,387,000	64,380,000	64,316,000	64,302,000	64,105,000
SL Green Operating Partnership
Stockholders' Equity
Number of units of operating partnership owned by the noncontrolling interest unit holders (units)	4,139,334		3,670,343
SL Green Operating Partnership \| Operating Partnership
Stockholders' Equity
Noncontrolling interest in the operating partnership (as a percent)	6.04%		5.39%
SL Green Operating Partnership \| Common Stock
Stockholders' Equity
Units outstanding (units)	64,397,983
SL Green Operating Partnership \| Series I Preferred Units
Stockholders' Equity
Units outstanding (units)	9,200,000
Period of restriction to redeem OP Units	1 year
Conversion of stock, shares issued	1

Investments in Unconsolidated Joint Ventures

9 Months Ended

Sep. 30, 2023

Equity Method Investments and Joint Ventures [Abstract]

Investments in Unconsolidated Joint Ventures

Investments in Unconsolidated Joint VenturesWe have investments in several real estate joint ventures with various partners. As of September 30, 2023, the book value of these investments was $3.2 billion, net of investments with negative book values totaling $129.1 million for which we have an implicit commitment to fund future capital needs.

As of September 30, 2023, 800 Third Avenue, 21 East 66th Street and 625 Madison Avenue are VIEs in which we are not the primary beneficiary. As of December 31, 2022, 800 Third Avenue and 21 East 66th Street are VIEs in which we are not the primary beneficiary. Our net equity investment in these VIEs was $453.7 million and $86.2 million as of September 30, 2023 and December 31, 2022, respectively. Our maximum loss is limited to the amount of our equity investment in these VIEs. See the "Principles of Consolidation" section of Note 2, "Significant Accounting Policies." 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 September 30, 2023:


Property	Partner	Ownership Interest (1)	Economic Interest (1)	Unaudited Approximate Square Feet
100 Park Avenue	Prudential Real Estate Investors	49.90%	49.90%	834,000
717 Fifth Avenue	Wharton Properties / Private Investor	10.92%	10.92%	119,500
800 Third Avenue	Private Investors	60.52%	60.52%	526,000
919 Third Avenue	New York State Teacher's Retirement System	51.00%	51.00%	1,454,000
11 West 34th Street	Private Investor / Wharton Properties	30.00%	30.00%	17,150
280 Park Avenue	Vornado Realty Trust	50.00%	50.00%	1,219,158
1552-1560 Broadway (2)	Wharton Properties	50.00%	50.00%	57,718
10 East 53rd Street	Canadian Pension Plan Investment Board	55.00%	55.00%	354,300
21 East 66th Street (3)	Private Investors	32.28%	32.28%	13,069
650 Fifth Avenue (4)	Wharton Properties	50.00%	50.00%	69,214
11 Madison Avenue	PGIM Real Estate	60.00%	60.00%	2,314,000
One Vanderbilt Avenue	National Pension Service of Korea / Hines Interest LP	71.01%	71.01%	1,657,198
Worldwide Plaza	RXR Realty / New York REIT	24.95%	24.95%	2,048,725
1515 Broadway	Allianz Real Estate of America	56.87%	56.87%	1,750,000
2 Herald Square	Israeli Institutional Investor	51.00%	51.00%	369,000
115 Spring Street	Private Investor	51.00%	51.00%	5,218
15 Beekman (5)	A fund managed by Meritz Alternative Investment Management	20.00%	20.00%	221,884
85 Fifth Avenue	Wells Fargo	36.27%	36.27%	12,946
One Madison Avenue (6)	National Pension Service of Korea / Hines Interest LP / International Investor	25.50%	25.50%	1,048,700
220 East 42nd Street	A fund managed by Meritz Alternative Investment Management	51.00%	51.00%	1,135,000
450 Park Avenue (7)	Korean Institutional Investor / Israeli Institutional Investor	50.10%	25.10%	337,000
5 Times Square	RXR Realty led investment group	31.55%	31.55%	1,131,735
245 Park Avenue (8)	U.S. Affiliate of Mori Trust Co., Ltd	50.10%	50.10%	1,782,793
625 Madison Avenue (9)	Private Investor	90.43%	90.43%	563,000

(1)Ownership interest and economic interest represent the Company's interests in the joint venture as of September 30, 2023. Changes in ownership or economic interests within the current year are disclosed in the notes below.

(2)The joint venture that owns 1552 Broadway also owns a long-term leasehold interest in the retail space and certain other spaces at 1560 Broadway, which is adjacent to 1552 Broadway.

(3)We hold a 32.28% interest in three retail units and one residential unit at the property and a 16.14% interest in two residential units at the property. In October, together with our joint venture partners, we entered into an agreement to sell the equity interests in the condominium units at the property. The sale is anticipated to close in the fourth quarter of 2023, subject to customary closing conditions.

(4)The joint venture owns a long-term leasehold interest in the retail space at 650 Fifth Avenue.

(5)In 2020, the Company formed a joint venture, which then entered into a long-term sublease with the Company.

(6)In 2020, the Company admitted partners to the One Madison Avenue development project, which resulted in the Company no longer retaining a controlling interest in the entity, as defined in ASC 810, and deconsolidation of our remaining 50.5% interest. We recorded our investment at fair value, which resulted in the recognition of a fair value adjustment of $187.5 million. The fair value of our investment was determined by the terms of the joint venture agreement governing the capitalization of the project. In 2021, the Company admitted an additional partner to the development project with the partner's indirect ownership in the joint venture totaling 25.0%. The transaction did not meet sale accounting under ASC 860 and, as a result, was treated as a secured borrowing for accounting purposes and is included in Other liabilities in our consolidated balance sheets at September 30, 2023 and December 31, 2022.

(7)The 50.1% ownership interest reflected in this table is comprised of our 25.1% economic interest and a 25.0% economic interest held by a third-party. The third-party's economic interest is held within a joint venture that we consolidate and recognize in Noncontrolling interests in other partnerships on our consolidated balance sheet. An additional third-party owns the remaining 49.9% economic interest in the property.

(8)In June 2023, the Company sold a 49.9% interest, which resulted in the Company no longer retaining a controlling interest in the entity, as defined in ASC 810, and deconsolidation of the 50.1% interest we retained. We recorded our investment at fair value which resulted in the recognition of a fair value adjustment of ($17.0 million) during the three and nine months ended September 30, 2023. The fair value of our investment was determined by the terms of the joint venture agreement.

(9)In September 2023, following a UCC foreclosure, the Company converted its previous mezzanine debt investments in the fee interest at 625 Madison Avenue to a 90.43% ownership interest. See Note 5, "Debt and Preferred Equity Investments."

Disposition of Joint Venture Interests or Properties

The following table summarizes the investments in unconsolidated joint ventures sold during the nine months ended September 30, 2023:


Property	Ownership Interest Disposed	Disposition Date	Gross Asset Valuation (in millions)		Loss on Sale (in millions) (1)
121 Greene Street	50.0%	February 2023	$	14.0	$	(0.3)

(1)Represents the Company's share of the loss.

Joint Venture Mortgages and Other Loans Payable

We generally finance our joint ventures with non-recourse debt. In certain cases, we may provide guarantees or master leases, which terminate upon the satisfaction of specified circumstances or repayment of the underlying loans. The mortgage notes and other loans payable collateralized by the respective joint venture properties and assignment of leases as of September 30, 2023 and December 31, 2022, respectively, are as follows (dollars in thousands):


Property	Economic Interest (1)		Maturity Date	Final Maturity Date (2)	Interest Rate (3)		September 30, 2023		December 31, 2022
Fixed Rate Debt:
717 Fifth Avenue	10.92	%	July 2022 (4)	July 2022 (4)		5.02%	$	655,328	$	655,328
650 Fifth Avenue	50.00	%	October 2023 (6)	January 2024		5.45%	65,000		65,000
220 East 42nd Street	51.00	%	June 2024	June 2025		5.86%	505,412		510,000
5 Times Square	31.55	%	September 2024	September 2026		7.07%	434,816		400,000
10 East 53rd Street	55.00	%	February 2025	February 2025		5.45%	220,000		220,000
1515 Broadway	56.87	%	March 2025	March 2025		3.93%	767,179		782,321
115 Spring Street	51.00	%	March 2025	March 2025		5.50%	65,550		—
450 Park Avenue	25.10	%	June 2025	June 2027		6.10%	267,000		267,000
11 Madison Avenue	60.00	%	September 2025	September 2025		3.84%	1,400,000		1,400,000
One Madison Avenue (5)	25.50	%	November 2025	November 2026		3.59%	662,663		467,008
800 Third Avenue	60.52	%	February 2026	February 2026		3.37%	177,000		177,000
919 Third Avenue	51.00	%	April 2026	April 2028		6.11%	500,000		500,000
625 Madison Avenue	90.43	%	December 2026	December 2026		6.05%	223,200		—
245 Park Avenue	50.10	%	June 2027	June 2027		4.30%	1,768,000		—
Worldwide Plaza	24.95	%	November 2027	November 2027		3.98%	1,200,000		1,200,000
One Vanderbilt Avenue	71.01	%	July 2031	July 2031		2.95%	3,000,000		3,000,000
280 Park Avenue									1,200,000
21 East 66th Street							—		12,000
Total fixed rate debt							$	11,911,148	$	10,855,657
Floating Rate Debt:
11 West 34th Street	30.00	%	February 2023 (4)	February 2023 (4)	L+	1.45%	$	23,000	$	23,000
650 Fifth Avenue	50.00	%	October 2023 (6)	January 2024	S+	2.25%	210,000		210,000
2 Herald Square	51.00	%	November 2023	November 2023	S+	2.06%	182,500		182,500
100 Park Avenue	49.90	%	December 2023	December 2025	S+	2.36%	360,000		360,000
15 Beekman (7)	20.00	%	January 2024	July 2025	S+	1.61%	123,168		86,738
1552 Broadway	50.00	%	February 2024	February 2024	S+	2.75%	193,132		193,132
280 Park Avenue	50.00	%	September 2024	September 2024	S+	2.03%	1,200,000		—
5 Times Square	31.55	%	September 2024	September 2026	S+	5.69%	604,598		495,924
21 East 66th Street	32.28	%	April 2027	April 2027	S+	1.75%	12,000		—
21 East 66th Street	32.28	%	June 2033	June 2033	T+	2.75%	555		586
115 Spring Street							—		65,550
121 Greene Street							—		12,550
Total floating rate debt							$	2,908,953	$	1,629,980
Total joint venture mortgages and other loans payable							$	14,820,101	$	12,485,637
Deferred financing costs, net							(112,175)		(136,683)
Total joint venture mortgages and other loans payable, net							$	14,707,926	$	12,348,954

(1)Economic interest represents the Company's interests in the joint venture as of September 30, 2023. Changes in ownership or economic interests, if any, within the current year are disclosed in the notes to the investment in unconsolidated joint ventures table above.

(2)Reflects exercise of all available options. The ability to exercise extension options may be subject to certain conditions, including meeting tests based on the operating performance of the property.

(3)Interest rates as of September 30, 2023, taking into account interest rate hedges in effect during the period. Floating rate debt is presented with the stated spread over Term SOFR ("S") or 1-year Treasury ("T").

(4)As of the date of this filing, the loan is in maturity default. The Company is in discussions with the lender on a resolution.

(5)The loan is a $1.25 billion construction facility with an initial term of five years with one, one year extension option. Advances under the loan are subject to costs incurred. In conjunction with the loan, the Company provided partial guarantees for interest and principal payments, the amounts of which are based on certain construction milestones and operating metrics. In July 2023, the facility was modified, which will allow the partnership to utilize the final tranche of the facility for an expanded range of uses, including additional amenities funded by construction cost savings and for hedging activities in contemplation of a permanent financing.

(6)As of the date of this filing, the Company has submitted its request to extend the maturity date of the loan in accordance with the loan agreement. While the Company believes the extension will be granted, the lender group is currently unable to respond given the turmoil in the Middle East.

(7)This loan is a $125.0 million construction facility. Advances under the loan are subject to costs incurred.

We are entitled to receive fees for providing management, leasing, construction supervision and asset management services to certain of our joint ventures. We earned $3.5 million and $16.3 million from these services, net of our ownership share of the joint ventures, for the three and nine months ended September 30, 2023, respectively. We earned $5.8 million and $15.0 million from these services, net of our ownership share of the joint ventures, for the three and nine months ended September 30, 2022, 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 September 30, 2023 and December 31, 2022 are as follows (in thousands):


	September 30, 2023		December 31, 2022
Assets (1)
Commercial real estate property, net	$	18,667,334	$	15,989,642
Cash and restricted cash	691,274		709,299
Tenant and other receivables, related party receivables, and deferred rents receivable	668,137		601,552

Other assets	2,656,613		2,551,426
Total assets	$	22,683,358	$	19,851,919
Liabilities and equity (1)
Mortgages and other loans payable, net	$	14,707,926	$	12,348,954
Deferred revenue	1,156,816		1,077,901
Lease liabilities	993,041		1,000,356
Other liabilities	444,208		456,537
Equity	5,381,367		4,968,171
Total liabilities and equity	$	22,683,358	$	19,851,919
Company's investments in unconsolidated joint ventures	$	3,152,752	$	3,190,137

(1)At September 30, 2023, $537.4 million of net unamortized basis differences between the amount at which our investments are carried and our share of equity in net assets of the underlying property will be amortized through equity in net income (loss) from unconsolidated joint ventures over the remaining life of the underlying items having given rise to the differences.

The combined statements of operations for the unconsolidated joint ventures, from acquisition date through the three and nine months ended September 30, 2023 and 2022, are as follows (in thousands):


	Three Months Ended September 30,				Nine Months Ended September 30,
	2023		2022		2023		2022
Total revenues	$	407,148	$	330,705	$	1,140,889	$	997,670
Operating expenses	63,081		59,841		183,825		173,327
Real estate taxes	78,564		66,594		210,428		186,710
Operating lease rent	7,307		6,616		21,746		19,465
Interest expense, net of interest income	162,897		112,747		421,528		305,977
Amortization of deferred financing costs	6,897		7,116		21,140		20,568

Depreciation and amortization	138,199		116,511		380,867		343,183
Total expenses	456,945		369,425		1,239,534		1,049,230
Loss on early extinguishment of debt	—		—		—		(467)
Net loss before gain (loss) on sale	$	(49,797)	$	(38,720)	$	(98,645)	$	(52,027)
Company's equity in net loss from unconsolidated joint ventures	$	(15,126)	$	(21,997)	$	(44,470)	$	(31,262)

Significant Accounting Policies (Policies)	9 Months Ended
Significant Accounting Policies (Policies)	Sep. 30, 2023
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 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.
Investment in Commercial Real Estate Properties	Investment in Commercial Real Estate Properties 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 3 years 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 1 year to 15 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 1 year to 15 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 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. The Company classifies those leases under which the Company is the lessee at lease commencement as finance or operating leases. Leases qualify as finance leases if the lease transfers ownership of the asset at the end of the lease term, the lease grants an option to purchase the asset that we are reasonably certain to exercise, the lease term is for a major part of the remaining economic life of the asset, or the present value of the lease payments exceeds substantially all of the fair value of the asset. Leases that do not qualify as finance leases are deemed to be operating leases. At lease commencement the Company records a lease liability which is measured as the present value of the lease payments and a right of use asset which is measured as the amount of the lease liability and any initial direct costs incurred. The Company applies a discount rate to determine the present value of the lease payments. If the rate implicit in the lease is known, the Company uses that rate. If the rate implicit in the lease is not known, the Company uses a discount rate reflective of the Company’s collateralized borrowing rate given the term of the lease. To determine the discount rate, the Company employs a third party specialist to develop an analysis based primarily on the observable borrowing rates of the Company, other REITs, and other corporate borrowers with long-term borrowings. On the consolidated statements of operations, operating leases are expensed through operating lease rent while financing leases are expensed through amortization and interest expense. When applicable, the Company combines the consideration for lease and non-lease components in the calculation of the value of the lease obligation and right-of-use asset.
Cash and Cash Equivalents	Cash and Cash Equivalents We consider all highly liquid investments with maturity of three months or less when purchased to be cash equivalents.
Restricted Cash	Restricted Cash Restricted cash primarily consists of security deposits held on behalf of our tenants, interest reserves, as well as capital improvement and real estate tax escrows required under certain loan agreements.
Investment in Marketable Securities	Investment in Marketable Securities At acquisition, we designate a debt security as held-to-maturity, available-for-sale, or trading. As of September 30, 2023, we did not have any debt securities designated as held-to-maturity or trading. We account for our available-for-sale securities at fair value pursuant to ASC 820-10, with the net unrealized gains or losses reported as a component of accumulated other comprehensive income or loss. The cost of marketable securities sold and the amount reclassified out of accumulated other comprehensive income into earnings is determined using the specific identification method. Credit losses are recognized in accordance with ASC 326. We account for our equity marketable securities at fair value pursuant to ASC 820-10, with the net unrealized gains or losses reported in net income.
Investments in Unconsolidated Joint Ventures	Investments in Unconsolidated Joint VenturesWe 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 each joint ventures' actual and projected cash flows.
Deferred Lease Costs and Lease Classification	Deferred Lease Costs Deferred lease costs consist of incremental fees and direct costs that would not have been incurred if the lease had not been obtained and are amortized on a straight-line basis over the related lease term. Lease Classification Lease classification for leases under which the Company is the lessor is evaluated at lease commencement and leases not classified as sales-type leases or direct financing leases are classified as operating leases. Leases qualify as sales-type leases if the contract includes either transfer of ownership clauses, certain purchase options, a lease term representing a major part of the economic life of the asset, or the present value of the lease payments and residual guarantees provided by the lessee exceeds substantially all of the fair value of the asset. Additionally, leasing an asset so specialized that it is not deemed to have any value to the Company at the end of the lease term may also result in classification as a sales-type lease. Leases qualify as direct financing leases when the present value of the lease payments and residual value guarantees provided by the lessee and unrelated third parties exceeds substantially all of the fair value of the asset and collection of the payments is probable.
Revenue Recognition	Revenue Recognition Rental revenue for operating leases is recognized on a straight-line basis over the term of the lease. Rental revenue recognition commences when the leased space is available for its intended use by the lessee. To determine whether the leased space is available for its intended use by the lessee, management evaluates whether we or the tenant are 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 of tenant improvements, rental revenue recognition begins when the tenant takes possession of or controls the space. 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. In addition to base rent, our tenants also generally will pay variable rent, which represents their pro rata share of increases in real estate taxes and certain operating expenses for the building over a base year. In some leases, in lieu of paying additional rent based upon increases in certain 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. Rental revenue is recognized if collectability is probable. If collectability of substantially all of the lease payments is assessed as not probable, any difference between the rental revenue recognized to date and the lease payments that have been collected is recognized as a current-period adjustment to rental revenue. A subsequent change in the assessment of collectability to probable may result in a current-period adjustment to rental revenue for any difference between the rental revenue that would have been recognized if collectability had always been assessed as probable and the rental revenue recognized to date. The Company provides its tenants with certain customary services for lease contracts such as common area maintenance and general security. We have elected to combine the non-lease components with the lease components of our operating lease agreements and account for them as a single lease component in accordance with ASC 842. We record a gain or loss on sale of real estate assets when we no longer have a controlling financial interest in the entity owning the real estate, a contract exists with a third party and that third party has control of the assets acquired. Investment income on debt and preferred equity investments is accrued based on the contractual terms of the instruments and when 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 collectible. 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 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 cash flows 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. We consider a debt and preferred equity investment to be past due when amounts contractually due have not been paid. 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 is resumed on any debt or preferred equity investment that is on non-accrual status when such debt or preferred equity investment becomes contractually current and performance is demonstrated to be resumed. 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 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.
Debt and Preferred Equity Investments	Debt and Preferred Equity Investments Debt and preferred equity investments are presented at the net amount expected to be collected in accordance with ASC 326. An allowance for loan losses is deducted from the amortized cost basis of the financial assets to present the net carrying value at the amount expected to be collected through the expected maturity date of such investments. The expense for loan loss and other investment reserves is the charge to earnings to adjust the allowance for loan losses to the appropriate level. Amounts are written off from the allowance when we de-recognize the related investment either as a result of a sale of the investment or acquisition of equity interests in the collateral. The Company evaluates the amount expected to be collected based on current market and economic conditions, historical loss information, and reasonable and supportable forecasts. The Company's assumptions are derived from both internal data and external data which may include, among others, governmental economic projections for the New York City Metropolitan area, public data on recent transactions and filings for securitized debt instruments. This information is aggregated by asset class and adjusted for duration. Based on these inputs, loans are evaluated at the individual asset level. In certain instances, we may also use a probability-weighted model that considers the likelihood of multiple outcomes and the amount expected to be collected for each outcome. The evaluation of the possible credit deterioration associated with the performance and/or value of the underlying collateral property as well as the financial and operating capability of the borrower/sponsor requires significant judgment, which include both asset level and market assumptions over the relevant time period. In addition, quarterly, the Company assigns each loan a risk rating. Based on a 3-point scale, loans are rated “1” through “3,” from lower risk to higher risk, which ratings are defined as follows: 1 - Low Risk Assets - Low probability of loss, 2 - Watch List Assets - Higher potential for loss, 3 - High Risk Assets - Loss more likely than not. Loans with risk ratings of 2 or above are evaluated to determine whether the expected risk of loss is appropriately captured through the combination of our expectations of current conditions, historical loss information and supportable forecasts described above or whether risk characteristics specific to the loan warrant the use of a probability-weighted model. Financing investments that are classified as held for sale are carried at the expected amount to be collected 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 expected amount to be collected. Other financing receivables that are included in balance sheet line items other than the Debt and preferred equity investments line are also measured at the net amount expected to be collected. Accrued interest receivable amounts related to these debt and preferred equity investment and other financing receivables are recorded at the net amount expected to be collected within Other assets in the consolidated balance sheets. Accrued interest receivables that are written off are recognized as an expense in loan loss and other investment reserves.
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 its 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 its 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. We have elected, and may elect in the future, to treat certain of our 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 nine months ended September 30, 2023, we recorded Federal, state and local tax provisions totaling $2.5 million and $5.2 million, respectively. During the three months ended September 30, 2022, we recorded a Federal, state and local tax benefit of $0.1 million. During the nine months ended September 30, 2022, we recorded a Federal, state and local tax provision of $2.2 million. 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.
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 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 initial and ongoing evaluations of the credit quality 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 potential source of funds to offset the economic costs associated with lost revenue from that tenant and the costs associated with re-tenanting a space.
Accounting Standards Updates	Accounting Standards Updates In March 2022, the FASB issued ASU No. 2022-02 Financial Instruments - Credit Losses (Topic 326) Troubled Debt Restructurings and Vintage Disclosures. ASU 2022-02 eliminates the troubled debt restructuring recognition and measurement guidance and, instead, requires that an entity evaluate whether the modification represents a new loan or a continuation of an existing loan. The amendments enhance existing disclosure requirements and introduce new requirements related to certain modifications of receivables made to borrowers experiencing financial difficulties. Additionally, ASU 2022-02 requires an entity to disclose current-period gross write-offs by year of origination for financing receivables and net investment in leases within the scope of Subtopic 326-20. Gross write-off information must be included in the vintage disclosures required for entities in accordance with Subtopic 326-20, which requires that an entity disclose the amortized cost basis of financing receivables by credit-quality indicator and class of financing receivable by year of origination. ASU 2022-02 is effective for reporting periods beginning after December 15, 2022, including interim periods within those fiscal years, with early adoption permitted. The Company adopted this guidance on January 1, 2023 and it did not have a material impact on the Company's consolidated financial statements. In August 2023, the FASB issued ASU No. 2023-05 Business Combinations - Joint Venture Formations (Subtopic 805-60) Recognition and Initial Measurement. ASU 2023-05 addresses the accounting for contributions made to a joint venture, upon formation, in a joint venture's separate financial statements. The objectives of the amendments are to provide decision-useful information to investors and other allocators of capital (collectively, investors) in a joint venture's financial statements and reduce diversity in practice. The amendments require that a joint venture apply the following key adaptations from the business combinations guidance upon formation: (i) a joint venture is the formation of a new entity without an accounting acquirer, (ii) a joint venture measures its identifiable net assets and goodwill, if any, at the formation date, (iii) initial measurement of a joint venture's total net assets is equal to the fair value of 100 percent of the joint venture's equity, and (iv) a joint venture provides relevant disclosures. ASU 2023-05 is effective prospectively for all joint venture formations with a formation date on or after January 1, 2025, with early adoption permitted in any interim or annual period in which financial statements have not yet been issued, either prospectively or retrospectively. We are currently evaluating the impact of the adoption of ASU 2023-05 on our consolidated financial statements, but do not believe the adoption of this standard will have a material impact on our consolidated financial statements.
Fair Value Measurements	Fair Value MeasurementsWe are required to disclose fair value information with regard to certain of 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 certain 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 evaluate real estate investments and debt and preferred equity investments, including intangibles, for potential impairment primarily utilizing cash flow projections that apply, among other things, estimated revenue and expense growth rates, discount rates and capitalization rates, as well as sales comparison approach, which utilizes comparable sales, listings and sales contracts. All of which are classified as Level 3 inputs. In June 2023, the Company sold a 49.9% interest in its 245 Park Avenue investment, which resulted in the Company no longer retaining a controlling interest in the entity, as defined in ASC 810, and deconsolidation of the 50.1% interest we retained. We recorded our investment at fair value which resulted in the recognition of a fair value adjustment of ($17.0 million) during the three and nine months ended September 30, 2023. The fair value of our investment was determined by the terms of the joint venture agreement. Marketable securities classified as Level 1 are derived from quoted prices in active markets. The valuation technique used to measure the fair value of 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. 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 instrument to their present value using adjusted market interest rates, which is provided by a third-party specialist.

Deferred Costs (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Deferred leasing costs	$ 392,760	$ 407,188
Less: accumulated amortization	(284,390)	(286,031)
Deferred costs, net	$ 108,370	$ 121,157

Debt and Preferred Equity Investments - Debt and Preferred Equity Investments (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Carrying Value	$ 334,327	$ 623,280
Senior Financing	1,319,704
Total floating rate
Debt Instrument [Line Items]
Carrying Value	158,430
Face Value	158,604
Total fixed rate
Debt Instrument [Line Items]
Carrying Value	175,897
Face Value	190,882
Mezzanine Debt
Debt Instrument [Line Items]
Carrying Value	208,430
Senior Financing	$ 1,069,704
Weighted Average Yield at End of Period	9.15%
Mezzanine Debt \| Total floating rate
Debt Instrument [Line Items]
Carrying Value	$ 158,430
Face Value	158,604
Mezzanine Debt \| Total fixed rate
Debt Instrument [Line Items]
Carrying Value	50,000
Face Value	64,985
Preferred Equity
Debt Instrument [Line Items]
Carrying Value	125,897
Senior Financing	$ 250,000
Weighted Average Yield at End of Period	6.55%
Preferred Equity \| Total floating rate
Debt Instrument [Line Items]
Carrying Value	$ 0
Face Value	$ 0
Basis spread on variable rate	0.00%
Preferred Equity \| Total fixed rate
Debt Instrument [Line Items]
Carrying Value	$ 125,897
Face Value	$ 125,897
Interest Rate	6.50%
Minimum \| Mezzanine Debt \| Total fixed rate
Debt Instrument [Line Items]
Interest Rate	7.00%
Maximum \| Mezzanine Debt \| Total fixed rate
Debt Instrument [Line Items]
Interest Rate	14.30%
SOFR \| Minimum \| Mezzanine Debt \| Total floating rate
Debt Instrument [Line Items]
Basis spread on variable rate	4.95%
SOFR \| Maximum \| Mezzanine Debt \| Total floating rate
Debt Instrument [Line Items]
Basis spread on variable rate	13.25%

Noncontrolling Interests on the Company's Consolidated Financial Statements - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Redemption and conversion of common units		$ (29,817)		$ (29,817)
Net loss	$ (1,574)	491	$ (27,493)	(1,831)
Accumulated other comprehensive (loss) income allocation	$ 771	3,114	$ 1,425	6,404
SL Green Operating Partnership
Organization
Number of units of operating partnership owned by the noncontrolling interest unit holders (shares)	4,139,334		4,139,334		3,670,343
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Redemption and conversion of common units		(29,817)		(29,817)
Accumulated other comprehensive (loss) income allocation	$ 771	$ 3,114	$ 1,425	6,404
SL Green Operating Partnership \| Series A
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Stated Distribution Rate			5.00%
Number of Units Authorized (in shares)	109,161		109,161
Number of Units Issued (in shares)	109,161		109,161
Number of Units Outstanding (in shares)	109,161		109,161
Annual Dividend Per Unit (in dollars per share)			$ 50.0000
Liquidation Preference Per Unit (in dollars per share)	$ 1,000		1,000
Conversion Price Per Unit (in dollars per share)	$ 0		$ 0
Number of company common stock issued on conversion of Series B preferred units	6.71348		6.71348
SL Green Operating Partnership \| Series F
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Stated Distribution Rate			7.00%
Number of Units Authorized (in shares)	60		60
Number of Units Issued (in shares)	60		60
Number of Units Outstanding (in shares)	60		60
Annual Dividend Per Unit (in dollars per share)			$ 70.0000
Liquidation Preference Per Unit (in dollars per share)	$ 1,000		1,000
Conversion Price Per Unit (in dollars per share)	$ 29.12		$ 29.12
SL Green Operating Partnership \| Series K
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Stated Distribution Rate			3.50%
Number of Units Authorized (in shares)	700,000		700,000
Number of Units Issued (in shares)	563,954		563,954
Number of Units Outstanding (in shares)	341,677		341,677
Annual Dividend Per Unit (in dollars per share)			$ 0.8750
Liquidation Preference Per Unit (in dollars per share)	$ 25.00		25.00
Conversion Price Per Unit (in dollars per share)	$ 134.67		$ 134.67
SL Green Operating Partnership \| Series L
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Stated Distribution Rate			4.00%
Number of Units Authorized (in shares)	500,000		500,000
Number of Units Issued (in shares)	378,634		378,634
Number of Units Outstanding (in shares)	372,634		372,634
Annual Dividend Per Unit (in dollars per share)			$ 1.0000
Liquidation Preference Per Unit (in dollars per share)	$ 25.00		25.00
Conversion Price Per Unit (in dollars per share)	$ 0		$ 0
SL Green Operating Partnership \| Series R
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Stated Distribution Rate			3.50%
Number of Units Authorized (in shares)	400,000		400,000
Number of Units Issued (in shares)	400,000		400,000
Number of Units Outstanding (in shares)	400,000		400,000
Annual Dividend Per Unit (in dollars per share)			$ 0.8750
Liquidation Preference Per Unit (in dollars per share)	$ 25.00		25.00
Conversion Price Per Unit (in dollars per share)	$ 154.89		$ 154.89
SL Green Operating Partnership \| Series S
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Stated Distribution Rate			4.00%
Number of Units Authorized (in shares)	1,077,280		1,077,280
Number of Units Issued (in shares)	1,077,280		1,077,280
Number of Units Outstanding (in shares)	1,077,280		1,077,280
Annual Dividend Per Unit (in dollars per share)			$ 1.0000
Liquidation Preference Per Unit (in dollars per share)	$ 25.00		25.00
Conversion Price Per Unit (in dollars per share)	$ 0		$ 0
SL Green Operating Partnership \| Series V
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Stated Distribution Rate			5.00%
Number of Units Authorized (in shares)	40,000		40,000
Number of Units Issued (in shares)	40,000		40,000
Number of Units Outstanding (in shares)	40,000		40,000
Annual Dividend Per Unit (in dollars per share)			$ 1.2500
Liquidation Preference Per Unit (in dollars per share)	$ 25.00		25.00
Conversion Price Per Unit (in dollars per share)	$ 0		$ 0
SL Green Operating Partnership \| Series W
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Number of Units Authorized (in shares)	1		1
Number of Units Issued (in shares)	1		1
Number of Units Outstanding (in shares)	1		1
Preferred stock, dividend, multiplier per common unit distribution			1,350
SL Green Operating Partnership \| Series B Preferred Stock
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Convertible preferred stock, shares issued upon conversion (in shares)	1		1
Partnership Interest
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Balance at beginning of period			$ 269,993	$ 344,252	$ 344,252
Distributions			(11,225)		(16,272)
Issuance of common units			16,350		22,855
Redemption and conversion of common units			(8,900)		(40,901)
Net loss			(27,493)		(5,794)
Accumulated other comprehensive (loss) income allocation			1,425		5,827
Fair value adjustment			8,072		(39,974)
Balance at end of period	$ 248,222		$ 248,222		$ 269,993
Operating Partnership \| SL Green Operating Partnership
Organization
Noncontrolling interest in the operating partnership (as a percent)	6.04%		6.04%		5.39%

Consolidated Statements of Cash Flows (Partnership) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Operating Activities
Net loss	$ (21,694)	$ 12,211	$ (439,279)	$ (12,253)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization			204,171	148,267
Equity in net loss from unconsolidated joint ventures	15,126	21,997	44,470	31,262
Distributions of cumulative earnings from unconsolidated joint ventures			514	448
Equity in net loss on sale of interest in unconsolidated joint venture interest/real estate	0	0	79	131
Purchase price and other fair value adjustments			6,987	7,348
Depreciable real estate reserves and impairment			305,527	0
Loss on sale of real estate, net	(516)	(4,276)	27,813	61,104
Loan loss reserves and other investment reserves, net of recoveries	0	0	6,890	0	$ 0
Deferred rents receivable			(16,195)	(1,371)
Non-cash lease expense			15,477	17,332
Other non-cash adjustments			6,645	(11,950)
Changes in operating assets and liabilities:
Tenant and other receivables			(2,852)	7,800
Related party receivables			16,466	5,803
Deferred lease costs			(8,066)	(10,227)
Other assets			(13,254)	(35,114)
Accounts payable, accrued expenses, other liabilities and security deposits			23,655	21,345
Deferred revenue			9,978	17,208
Lease liability - operating leases			(7,688)	2,495
Net cash provided by operating activities			181,338	249,628
Investing Activities
Acquisitions of real estate property			0	(64,491)
Additions to land, buildings and improvements			(194,035)	(194,997)
Acquisition deposits and deferred purchase price			0	75,400
Investments in unconsolidated joint ventures			(119,522)	(146,598)
Distributions in excess of cumulative earnings from unconsolidated joint ventures			108,884	92,217
Net proceeds from disposition of real estate/joint venture interest			547,605	353,853
Cash and restricted cash assumed from acquisition of real estate investment			0	60,494
Proceeds from sale or redemption of marketable securities			0	11,465
Other investments			(17,545)	1,619
Origination of debt and preferred equity investments			(53,703)	(40,053)
Repayments or redemption of debt and preferred equity investments			0	124,405
Net cash provided by investing activities			271,684	273,314
Financing Activities
Proceeds from mortgages and other loans payable			0	381,980
Repayments of mortgages and other loans payable			(4,340)	(290,936)
Proceeds from revolving credit facility, term loans and unsecured notes			358,000	1,124,000
Repayments of revolving credit facility, term loans and unsecured notes			(808,000)	(1,364,000)
Proceeds from stock options exercised and DRSPP issuance			439	339
Repurchase of common units			0	(151,197)
Redemption of preferred units			(11,700)	(17,967)
Redemption of OP units			(8,900)	(35,316)
Distributions to noncontrolling interests in other partnerships			(1,614)	(3,168)
Contributions from noncontrolling interests in other partnerships			3,580	52,164
Acquisition of subsidiary interest from noncontrolling interest			0	(29,817)
Distributions paid on common and preferred units			(172,920)	(197,124)
Other obligations related to secured borrowing			129,656	77,874
Tax withholdings related to restricted share awards			0	(3,915)
Deferred loan costs			(729)	(5,130)
Net cash used in financing activities			(527,753)	(474,848)
Net (decrease) increase in cash, cash equivalents, and restricted cash			(74,731)	48,094
Cash, cash equivalents, and restricted cash at beginning of year			384,054	336,984	336,984
Cash, cash equivalents, and restricted cash at end of period	309,323	385,078	309,323	385,078	384,054
Supplemental Disclosure of Non-Cash Investing and Financing Activities:
Exchange of preferred equity investment for real estate or equity in joint venture			0	190,652
Exchange of debt investment for real estate or equity in joint venture			349,946	193,995
Assumption of mortgage and mezzanine loans			0	1,712,750
Issuance of special distribution paid primarily in units			0	160,620
Tenant improvements and capital expenditures payable			0	18,518
Fair value adjustment to noncontrolling interest in the Operating Partnership			8,072	23,539
Contribution to consolidated joint venture interest			8,134	0
Debt and preferred equity investments			0	302
Removal of fully depreciated commercial real estate properties			7,747	4,048
Recognition of right of use assets and related lease liabilities			0	57,938
Cash and cash equivalents	189,750	201,267	189,750	201,267	203,273
Restricted cash	119,573	183,811	119,573	183,811	180,781
Total cash, cash equivalents, and restricted cash	309,323	385,078	309,323	385,078	384,054
SL Green Operating Partnership
Operating Activities
Net loss	(21,694)	12,211	(439,279)	(12,253)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization			204,171	148,267
Equity in net loss from unconsolidated joint ventures	15,126	21,997	44,470	31,262
Distributions of cumulative earnings from unconsolidated joint ventures			514	448
Equity in net loss on sale of interest in unconsolidated joint venture interest/real estate	0	0	79	131
Purchase price and other fair value adjustments			6,987	7,348
Depreciable real estate reserves and impairment			305,527	0
Loss on sale of real estate, net	(516)	(4,276)	27,813	61,104
Loan loss reserves and other investment reserves, net of recoveries	0	0	6,890	0
Deferred rents receivable			(16,195)	(1,371)
Non-cash lease expense			15,477	17,332
Other non-cash adjustments			6,645	(11,950)
Changes in operating assets and liabilities:
Tenant and other receivables			(2,852)	7,800
Related party receivables			16,466	5,803
Deferred lease costs			(8,066)	(10,227)
Other assets			(13,254)	(35,114)
Accounts payable, accrued expenses, other liabilities and security deposits			23,655	21,345
Deferred revenue			9,978	17,208
Lease liability - operating leases			(7,688)	2,495
Net cash provided by operating activities			181,338	249,628
Investing Activities
Acquisitions of real estate property			0	(64,491)
Additions to land, buildings and improvements			(194,035)	(194,997)
Acquisition deposits and deferred purchase price			0	75,400
Investments in unconsolidated joint ventures			(119,522)	(146,598)
Distributions in excess of cumulative earnings from unconsolidated joint ventures			108,884	92,217
Net proceeds from disposition of real estate/joint venture interest			547,605	353,853
Cash and restricted cash assumed from acquisition of real estate investment			0	60,494
Proceeds from sale or redemption of marketable securities			0	11,465
Other investments			(17,545)	1,619
Origination of debt and preferred equity investments			(53,703)	(40,053)
Repayments or redemption of debt and preferred equity investments			0	124,405
Net cash provided by investing activities			271,684	273,314
Financing Activities
Proceeds from mortgages and other loans payable			0	381,980
Repayments of mortgages and other loans payable			(4,340)	(290,936)
Proceeds from revolving credit facility, term loans and unsecured notes			358,000	1,124,000
Repayments of revolving credit facility, term loans and unsecured notes			(808,000)	(1,364,000)
Proceeds from stock options exercised and DRSPP issuance			439	339
Repurchase of common units			0	(151,197)
Redemption of preferred units			(11,700)	(17,967)
Redemption of OP units			(8,900)	(35,316)
Distributions to noncontrolling interests in other partnerships			(1,614)	(3,168)
Contributions from noncontrolling interests in other partnerships			3,580	52,164
Acquisition of subsidiary interest from noncontrolling interest			0	(29,817)
Distributions paid on common and preferred units			(184,145)	(209,759)
Other obligations related to secured borrowing			129,656	77,874
Tax withholdings related to restricted share awards			0	(3,915)
Deferred loan costs			(729)	(5,130)
Net cash used in financing activities			(527,753)	(474,848)
Net (decrease) increase in cash, cash equivalents, and restricted cash			(74,731)	48,094
Cash, cash equivalents, and restricted cash at beginning of year			384,054	336,984	336,984
Cash, cash equivalents, and restricted cash at end of period	309,323	385,078	309,323	385,078	384,054
Supplemental Disclosure of Non-Cash Investing and Financing Activities:
Exchange of preferred equity investment for real estate or equity in joint venture			0	190,652
Exchange of debt investment for real estate or equity in joint venture			349,946	193,995
Assumption of mortgage and mezzanine loans			0	1,712,750
Issuance of special distribution paid primarily in units			0	160,620
Tenant improvements and capital expenditures payable			0	18,518
Fair value adjustment to noncontrolling interest in the Operating Partnership			8,072	23,539
Deconsolidation of a subsidiary			101,351	0
Contribution to consolidated joint venture interest			8,134	0
Debt and preferred equity investments			0	302
Removal of fully depreciated commercial real estate properties			7,747	4,048
Recognition of right of use assets and related lease liabilities			0	57,938
Cash and cash equivalents	189,750	201,267	189,750	201,267	203,273
Restricted cash	119,573	183,811	119,573	183,811	180,781
Total cash, cash equivalents, and restricted cash	$ 309,323	$ 385,078	$ 309,323	$ 385,078	$ 384,054

Significant Accounting Policies - Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Income taxes
Federal, state and local tax provision	$ 2.5	$ 0.1	$ 5.2	$ 2.2

- Definition

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References + Details

Fair Value Measurements (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended	9 Months Ended
Fair Value Measurements (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Sep. 30, 2023	Sep. 30, 2023	Dec. 31, 2022
Fair Value of Financial Instruments
Marketable securities available-for-sale		$ 9,616	$ 9,616	$ 11,240
Interest rate cap and swap agreements (included in Other assets)		77,921	77,921	57,660
Interest rate cap and swap agreements (included in Other liabilities)		5,968	5,968	10,142
Debt and preferred equity investments		334,327	334,327	623,280
Ownership percentage deconsolidated	50.10%
Investment fair value adjustment	$ 17,000	17,000	17,000
245 Park Avenue
Fair Value of Financial Instruments
Ownership interest sold	49.90%
Carrying Value
Fair Value of Financial Instruments
Debt and preferred equity investments		334,327	334,327	623,280
Fixed rate debt		3,248,724	3,248,724	5,015,814
Variable rate debt		120,148	120,148	520,148
Total		3,368,872	3,368,872	5,535,962
Fair Value
Fair Value of Financial Instruments
Total		3,306,816	3,306,816	5,304,360
Estimated fair value of debt and preferred equity investments, low end of range		300,000	300,000	600,000
Estimated fair value of debt and preferred equity investments, high end of range		300,000	300,000	600,000
Level 1
Fair Value of Financial Instruments
Marketable securities available-for-sale		0	0	0
Interest rate cap and swap agreements (included in Other assets)		0	0	0
Interest rate cap and swap agreements (included in Other liabilities)		0	0	0
Level 2
Fair Value of Financial Instruments
Marketable securities available-for-sale		9,616	9,616	11,240
Interest rate cap and swap agreements (included in Other assets)		77,921	77,921	57,660
Interest rate cap and swap agreements (included in Other liabilities)		5,968	5,968	10,142
Level 3
Fair Value of Financial Instruments
Marketable securities available-for-sale		0	0	0
Interest rate cap and swap agreements (included in Other assets)		0	0	0
Interest rate cap and swap agreements (included in Other liabilities)		0	0	0
Level 3 \| Fair Value
Fair Value of Financial Instruments
Fixed rate debt		3,188,552	3,188,552	4,784,691
Variable rate debt		$ 118,264	$ 118,264	$ 519,669

Debt and Preferred Equity Investments - Preferred Equity Investments (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Dec. 31, 2022	Dec. 31, 2021
Preferred equity investment
Aggregate weighted average current yield (as a percent)	9.15%
Carrying Value	$ 334,327	$ 623,280
Allowance for loan loss	$ (13,520)	(6,630)	$ (6,630)
Preferred equity investments
Preferred equity investment
Aggregate weighted average current yield (as a percent)	6.55%
Future Funding Obligations	$ 0
Senior Financing	250,000
Allowance for loan loss	0	0
Total after allowance for loan loss	125,897	119,858
Preferred Equity, February 2027
Preferred equity investment
Future Funding Obligations	0
Senior Financing	250,000
Carrying Value	$ 125,897	$ 119,858

Significant Accounting Policies

9 Months Ended

Sep. 30, 2023

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 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.

Investment in Commercial Real Estate Properties

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 3 years 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 1 year to 15 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 1 year to 15 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 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.

The Company classifies those leases under which the Company is the lessee at lease commencement as finance or operating leases. Leases qualify as finance leases if the lease transfers ownership of the asset at the end of the lease term, the lease grants an option to purchase the asset that we are reasonably certain to exercise, the lease term is for a major part of the remaining economic life of the asset, or the present value of the lease payments exceeds substantially all of the fair value of the asset. Leases that do not qualify as finance leases are deemed to be operating leases. At lease commencement the Company records a lease liability which is measured as the present value of the lease payments and a right of use asset which is measured as the amount of the lease liability and any initial direct costs incurred. The Company applies a discount rate to determine the present value of the lease payments. If the rate implicit in the lease is known, the Company uses that rate. If the rate implicit in the lease is not known, the Company uses a discount rate reflective of the Company’s collateralized borrowing rate given the term of the lease. To determine the discount rate, the Company employs a third party specialist to develop an analysis based primarily on the observable borrowing rates of the Company, other REITs, and other corporate borrowers with long-term borrowings. On the consolidated statements of operations, operating leases are expensed through operating lease rent while financing leases are expensed through amortization and interest expense. When applicable, the Company combines the consideration for lease and non-lease components in the calculation of the value of the lease obligation and right-of-use asset.

On a periodic basis, we assess whether there are any indications that the value of our real estate properties may be 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 fair value of the property as calculated in accordance with Accounting Standards Codification, or ASC 820. We also evaluate our real estate properties for impairment when a property has been classified as held for sale. Real estate assets held for sale are valued at the lower of their carrying value or fair value less costs to sell and depreciation expense is no longer recorded.

In April 2023, the ground rent appraisal proceeding concluded for our wholly-owned leasehold interest at 625 Madison Avenue. As a result of that proceeding, the ground rent was reset from the previous rent of $4.61 million per annum to a new rent of $20.25 million per annum, effective as of July 1, 2022. Following a strategic review of the property that addressed a range of relevant considerations, including the increase in ground rent to an amount substantially above what the Company believed was appropriate, the Company recorded a $305.9 million charge to write down the carrying value of its investment in the leasehold interest to zero in the quarter ending June 30, 2023, which is included in Depreciable real estate reserves and impairments in the consolidated statement of operations.

For the three months ended September 30, 2023, we recognized a reduction of rental revenue of ($0.1 million) for the amortization of aggregate above-market leases in excess of below-market leases resulting from the allocation of the purchase price of the applicable properties. For the nine months ended September 30, 2023, we recognized additional rental revenue of $14.3 million for the amortization of aggregate below-market leases in excess of above-market leases. For the three and nine months ended September 30, 2022, we recognized additional rental revenue of $0.2 million and a reduction of rental revenue of ($0.1 million), 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 September 30, 2023 and December 31, 2022 (in thousands):


	September 30, 2023		December 31, 2022
Identified intangible assets (included in other assets):
Gross amount	$	189,680	$	403,552
Accumulated amortization	(184,491)		(190,066)
Net	$	5,189	$	213,486
Identified intangible liabilities (included in deferred revenue):
Gross amount	$	205,394	$	361,338
Accumulated amortization	(202,000)		(212,191)
Net	$	3,394	$	149,147

Cash and Cash Equivalents

We consider all highly liquid investments with maturity of three months or less when purchased to be cash equivalents.

Restricted Cash

Restricted cash primarily consists of security deposits held on behalf of our tenants, interest reserves, as well as capital improvement and real estate tax escrows required under certain loan agreements.

Fair Value Measurements

See Note 16, "Fair Value Measurements."

Investment in Marketable Securities

At acquisition, we designate a debt security as held-to-maturity, available-for-sale, or trading. As of September 30, 2023, we did not have any debt securities designated as held-to-maturity or trading. We account for our available-for-sale securities at fair value pursuant to ASC 820-10, with the net unrealized gains or losses reported as a component of accumulated other comprehensive income or loss. The cost of marketable securities sold and the amount reclassified out of accumulated other comprehensive income into earnings is determined using the specific identification method. Credit losses are recognized in accordance with ASC 326. We account for our equity marketable securities at fair value pursuant to ASC 820-10, with the net unrealized gains or losses reported in net income.

As of September 30, 2023 and December 31, 2022, we held the following marketable securities (in thousands):


	September 30, 2023		December 31, 2022
Commercial mortgage-backed securities	$	9,616	$	11,240



Total investment in marketable securities	$	9,616	$	11,240

The cost basis of the commercial mortgage-backed securities was $11.5 million as of September 30, 2023 and December 31, 2022, respectively. These securities mature at various times through 2030. All securities were in an unrealized loss position as of September 30, 2023 and December 31, 2022 with an unrealized loss of $1.9 million and a fair value of $9.6 million as of September 30, 2023, and an unrealized loss of $0.3 million and a fair value of $11.2 million as of December 31, 2022. The securities were in a continuous unrealized loss position for less than 12 months as of September 30, 2023 and December 31, 2022. We do not intend to sell our other securities, and it is more likely than not that we will not be required to sell the investments before recovery of their amortized cost bases.

We did not dispose of any debt marketable securities during three and nine months ended September 30, 2023. During the three and nine months ended September 30, 2022, we received aggregate net proceeds of $7.8 million from the sale of one debt marketable security and $3.7 million from the repayment of one debt marketable security.

We held no equity marketable securities as of September 30, 2023 and December 31, 2022. We recognized $0.1 million of unrealized gain for the three months ended September 30, 2022 and $6.1 million of unrealized loss for the nine months ended September 30, 2022.

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 each joint ventures' actual and projected cash flows. We do not believe that the values of any of our equity investments were impaired at September 30, 2023.

Deferred Lease Costs

Deferred lease costs consist of incremental fees and direct costs that would not have been incurred if the lease had not been obtained and are amortized on a straight-line basis over the related lease term.

Lease Classification

Lease classification for leases under which the Company is the lessor is evaluated at lease commencement and leases not classified as sales-type leases or direct financing leases are classified as operating leases. Leases qualify as sales-type leases if the contract includes either transfer of ownership clauses, certain purchase options, a lease term representing a major part of the economic life of the asset, or the present value of the lease payments and residual guarantees provided by the lessee exceeds substantially all of the fair value of the asset. Additionally, leasing an asset so specialized that it is not deemed to have any value to the Company at the end of the lease term may also result in classification as a sales-type lease. Leases qualify as direct financing leases when the present value of the lease payments and residual value guarantees provided by the lessee and unrelated third parties exceeds substantially all of the fair value of the asset and collection of the payments is probable.

Revenue Recognition

Rental revenue for operating leases is recognized on a straight-line basis over the term of the lease. Rental revenue recognition commences when the leased space is available for its intended use by the lessee.

To determine whether the leased space is available for its intended use by the lessee, management evaluates whether we or the tenant are 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 of tenant improvements, rental revenue recognition begins when the tenant takes possession of or controls the space.

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.

In addition to base rent, our tenants also generally will pay variable rent, which represents their pro rata share of increases in real estate taxes and certain operating expenses for the building over a base year. In some leases, in lieu of paying additional rent based upon increases in certain 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.

Rental revenue is recognized if collectability is probable. If collectability of substantially all of the lease payments is assessed as not probable, any difference between the rental revenue recognized to date and the lease payments that have been collected is recognized as a current-period adjustment to rental revenue. A subsequent change in the assessment of collectability to probable may result in a current-period adjustment to rental revenue for any difference between the rental revenue that would have been recognized if collectability had always been assessed as probable and the rental revenue recognized to date.

The Company provides its tenants with certain customary services for lease contracts such as common area maintenance and general security. We have elected to combine the non-lease components with the lease components of our operating lease agreements and account for them as a single lease component in accordance with ASC 842.

We record a gain or loss on sale of real estate assets when we no longer have a controlling financial interest in the entity owning the real estate, a contract exists with a third party and that third party has control of the assets acquired.

Investment income on debt and preferred equity investments is accrued based on the contractual terms of the instruments and when 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 collectible. 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 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 cash flows 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.

We consider a debt and preferred equity investment to be past due when amounts contractually due have not been paid. 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 is resumed on any debt or preferred equity investment that is on non-accrual status when such debt or preferred equity investment becomes contractually current and performance is demonstrated to be resumed.

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 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.

Debt and Preferred Equity Investments

Debt and preferred equity investments are presented at the net amount expected to be collected in accordance with ASC 326. An allowance for loan losses is deducted from the amortized cost basis of the financial assets to present the net carrying value at the amount expected to be collected through the expected maturity date of such investments. The expense for loan loss and other investment reserves is the charge to earnings to adjust the allowance for loan losses to the appropriate level. Amounts are written off from the allowance when we de-recognize the related investment either as a result of a sale of the investment or acquisition of equity interests in the collateral.

The Company evaluates the amount expected to be collected based on current market and economic conditions, historical loss information, and reasonable and supportable forecasts. The Company's assumptions are derived from both internal data and external data which may include, among others, governmental economic projections for the New York City Metropolitan area, public data on recent transactions and filings for securitized debt instruments. This information is aggregated by asset class and adjusted for duration. Based on these inputs, loans are evaluated at the individual asset level. In certain instances, we may also use a probability-weighted model that considers the likelihood of multiple outcomes and the amount expected to be collected for each outcome.

The evaluation of the possible credit deterioration associated with the performance and/or value of the underlying collateral property as well as the financial and operating capability of the borrower/sponsor requires significant judgment, which include both asset level and market assumptions over the relevant time period.

In addition, quarterly, the Company assigns each loan a risk rating. Based on a 3-point scale, loans are rated “1” through “3,” from lower risk to higher risk, which ratings are defined as follows: 1 - Low Risk Assets - Low probability of loss, 2 - Watch List Assets - Higher potential for loss, 3 - High Risk Assets - Loss more likely than not. Loans with risk ratings of 2 or above are evaluated to determine whether the expected risk of loss is appropriately captured through the combination of our expectations of current conditions, historical loss information and supportable forecasts described above or whether risk characteristics specific to the loan warrant the use of a probability-weighted model.

Financing investments that are classified as held for sale are carried at the expected amount to be collected 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 expected amount to be collected.

Other financing receivables that are included in balance sheet line items other than the Debt and preferred equity investments line are also measured at the net amount expected to be collected.

Accrued interest receivable amounts related to these debt and preferred equity investment and other financing receivables are recorded at the net amount expected to be collected within Other assets in the consolidated balance sheets. Accrued interest receivables that are written off are recognized as an expense in loan loss and other investment reserves.

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 its 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 its 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.

We have elected, and may elect in the future, to treat certain of our 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 nine months ended September 30, 2023, we recorded Federal, state and local tax provisions totaling $2.5 million and $5.2 million, respectively. During the three months ended September 30, 2022, we recorded a Federal, state and local tax benefit of $0.1 million. During the nine months ended September 30, 2022, we recorded a Federal, state and local tax provision of $2.2 million.

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.

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 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 initial and ongoing evaluations of the credit quality 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 potential source of funds to offset the economic costs associated with lost revenue from that tenant and the costs associated with re-tenanting a space. The properties in our real estate portfolio are located in the New York metropolitan area, principally in Manhattan. Our tenants operate in various industries. Other than one tenant, Paramount Global (formerly ViacomCBS Inc.), which accounted for 6.0% of our share of annualized cash rent as of September 30, 2023, 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 cash rent, for the three months ended September 30, 2023.

For the three months ended September 30, 2023, the following properties contributed more than 5.0% of our annualized cash rent from office properties, including our share of annualized cash rent from joint venture office properties:


Property			Three months ended September 30, 2023
One Vanderbilt Avenue			15.6%
11 Madison Avenue			8.3%
420 Lexington Ave			6.8%
1515 Broadway			6.4%
245 Park Avenue			5.7%
280 Park Avenue			5.7%
1185 Avenue of the Americas			5.5%

Accounting Standards Updates

In March 2022, the FASB issued ASU No. 2022-02 Financial Instruments - Credit Losses (Topic 326) Troubled Debt Restructurings and Vintage Disclosures. ASU 2022-02 eliminates the troubled debt restructuring recognition and measurement guidance and, instead, requires that an entity evaluate whether the modification represents a new loan or a continuation of an existing loan. The amendments enhance existing disclosure requirements and introduce new requirements related to certain modifications of receivables made to borrowers experiencing financial difficulties. Additionally, ASU 2022-02 requires an entity to disclose current-period gross write-offs by year of origination for financing receivables and net investment in leases within the scope of Subtopic 326-20. Gross write-off information must be included in the vintage disclosures required for entities in accordance with Subtopic 326-20, which requires that an entity disclose the amortized cost basis of financing receivables by credit-quality indicator and class of financing receivable by year of origination. ASU 2022-02 is effective for reporting periods beginning after December 15, 2022, including interim periods within those fiscal years, with early adoption permitted. The Company adopted this guidance on January 1, 2023 and it did not have a material impact on the Company's consolidated financial statements.

In August 2023, the FASB issued ASU No. 2023-05 Business Combinations - Joint Venture Formations (Subtopic 805-60) Recognition and Initial Measurement. ASU 2023-05 addresses the accounting for contributions made to a joint venture, upon formation, in a joint venture's separate financial statements. The objectives of the amendments are to provide decision-useful information to investors and other allocators of capital (collectively, investors) in a joint venture's financial statements and reduce diversity in practice. The amendments require that a joint venture apply the following key adaptations from the business combinations guidance upon formation: (i) a joint venture is the formation of a new entity without an accounting acquirer, (ii) a joint venture measures its identifiable net assets and goodwill, if any, at the formation date, (iii) initial measurement of a joint venture's total net assets is equal to the fair value of 100 percent of the joint venture's equity, and (iv) a joint venture provides relevant disclosures. ASU 2023-05 is effective prospectively for all joint venture formations with a formation date on or after January 1, 2025, with early adoption permitted in any interim or annual period in which financial statements have not yet been issued, either prospectively or retrospectively. We are currently evaluating the impact of the adoption of ASU 2023-05 on our consolidated financial statements, but do not believe the adoption of this standard will have a material impact on our consolidated financial statements.

Accumulated Other Comprehensive Income

9 Months Ended

Sep. 30, 2023

Equity [Abstract]

Accumulated Other Comprehensive Income

Stockholders’ Equity of the Company

Common Stock

Share Repurchase Program

As of September 30, 2023, share repurchases executed under the program, excluding the redemption of OP units, were as follows:


Period	Shares repurchased(1)	Average price paid per share	Cumulative number of shares repurchased as part of the repurchase plan or programs
Year ended 2020	8,276,032	$64.30	29,661,978
Year ended 2021	4,474,649	$75.44	34,136,627
Year ended 2022	1,971,092	$76.69	36,107,719

(1)There were no share repurchases during the nine months ended September 30, 2023.

Perpetual Preferred Stock

Dividend Reinvestment and Stock Purchase Plan ("DRSPP")


	Three Months Ended September 30,				Nine Months Ended September 30,
	2023		2022		2023		2022
Shares of common stock issued	2,695		2,933		14,736		5,827
Dividend reinvestments/stock purchases under the DRSPP	$	97	$	140	$	439	$	339

Earnings per Share

SL Green's earnings per share for the three and nine months ended September 30, 2023 and 2022 are computed as follows (in thousands):


	Three Months Ended September 30,				Nine Months Ended September 30,
Numerator	2023		2022		2023		2022
Basic Earnings:
(Loss) income attributable to SL Green common stockholders	$	(23,967)	$	7,377	$	(423,892)	$	(28,748)
Less: distributed earnings allocated to participating securities	(408)		(505)		(1,225)		(1,516)

Net (loss) income attributable to SL Green common stockholders (numerator for basic earnings per share)	$	(24,375)	$	6,872	$	(425,117)	$	(30,264)
Add back: dilutive effect of earnings allocated to participating securities and contingently issuable shares	—		505		—		(484)

Add back: effect of dilutive securities (redemption of units to common shares)	(1,574)		491		(27,493)		(1,831)
Net (loss) income attributable to SL Green common stockholders (numerator for diluted earnings per share)	$	(25,949)	$	7,868	$	(452,610)	$	(32,579)


	Three Months Ended September 30,		Nine Months Ended September 30,
Denominator	2023	2022	2023	2022
Basic Shares:
Weighted average common stock outstanding	64,114	63,949	64,099	63,971
Effect of Dilutive Securities:
Operating Partnership units redeemable for common shares	4,182	4,088	4,175	4,104
Stock-based compensation plans	—	860	—	1,052
Contingently issuable shares	—	—	—	122
Diluted weighted average common stock outstanding	68,296	68,897	68,274	69,249

Partners' Capital of the Operating Partnership

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 September 30, 2023, limited partners other than SL Green owned 6.04%, or 4,139,334 common units, of the Operating Partnership.

Preferred Units

Earnings per Unit

The Operating Partnership's earnings per unit for the three and nine months ended September 30, 2023 and 2022, respectively, are computed as follows (in thousands):


	Three Months Ended September 30,				Nine Months Ended September 30,
Numerator	2023		2022		2023		2022
Basic Earnings:
Net (loss) income attributable to SLGOP common unitholders (numerator for diluted earnings per unit)	$	(25,541)	$	7,868	$	(451,385)	$	(30,579)
Less: distributed earnings allocated to participating securities	(408)		(505)		(1,225)		(1,516)

Net (loss) income attributable to SLGOP common unitholders (numerator for basic earnings per unit)	$	(25,949)	$	7,363	$	(452,610)	$	(32,095)
Add back: dilutive effect of earnings allocated to participating securities and contingently issuable shares	—		505		—		(484)

Net (loss) income attributable to SLGOP common unitholders (numerator for diluted earnings per unit)	$	(25,949)	$	7,868	$	(452,610)	$	(32,579)


	Three Months Ended September 30,		Nine Months Ended September 30,
Denominator	2023	2022	2023	2022
Basic units:
Weighted average common units outstanding	68,296	68,037	68,274	68,075
Effect of Dilutive Securities:
Stock-based compensation plans	—	860	—	1,052
Contingently issuable units	—	—	—	122
Diluted weighted average common units outstanding	68,296	68,897	68,274	69,249

Accumulated Other Comprehensive Income

The following tables set forth the changes in accumulated other comprehensive income by component as of September 30, 2023 (in thousands):


	Net unrealized gain (loss) on derivative instruments (1)		SL Green’s share of joint venture net unrealized gain (loss) on derivative instruments (2)		Net unrealized loss on marketable securities		Total
Balance at December 31, 2022	$	47,800	$	2,046	$	(242)	$	49,604
Other comprehensive income before reclassifications	49,326		12,649		(1,525)		60,450
Amounts reclassified from accumulated other comprehensive income	(29,175)		(11,263)		—		(40,438)
Balance at September 30, 2023	$	67,951	$	3,432	$	(1,767)	$	69,616

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

- Definition

The entire disclosure for equity.

+ References

+ Details

Mortgages and Other Loans Payable

9 Months Ended

Sep. 30, 2023

Mortgages and Other Loans Payable

Mortgages and Other Loans Payable

The mortgages and other loans payable collateralized by the respective properties and assignment of leases or debt investments as of September 30, 2023 and December 31, 2022, respectively, were as follows (dollars in thousands):


Property	Maturity Date	Final Maturity Date (1)	Interest Rate (2)		September 30, 2023		December 31, 2022
Fixed Rate Debt:

7 Dey / 185 Broadway (3)	November 2023	November 2023		7.59%	$	200,000	$	200,000
420 Lexington Avenue	October 2024	October 2040		3.99%	278,724		283,064
100 Church Street	June 2025	June 2027		5.89%	370,000		370,000
Landmark Square	January 2027	January 2027		4.90%	100,000		100,000
485 Lexington Avenue	February 2027	February 2027		4.25%	450,000		450,000
245 Park Avenue					—		1,712,750
Total fixed rate debt					$	1,398,724	$	3,115,814
Floating Rate Debt:
7 Dey / 185 Broadway (3)	November 2023	November 2023	S+	2.85%	$	10,148	$	10,148
690 Madison Avenue	July 2024	July 2025	S+	0.50%	60,000		60,000
719 Seventh Avenue	December 2024	December 2024	S+	1.31%	50,000		50,000
Total floating rate debt					$	120,148	$	120,148


Total mortgages and other loans payable					$	1,518,872	$	3,235,962
Deferred financing costs, net of amortization					(6,126)		(8,399)
Total mortgages and other loans payable, net					$	1,512,746	$	3,227,563

(1)Reflects exercise of all available options. The ability to exercise extension options may be subject to certain tests based on the operating performance of the property.

(2)Interest rate as of September 30, 2023, taking into account interest rate hedges in effect during the period. Floating rate debt is presented with the stated spread over Term SOFR ("S"), unless otherwise specified.

(3)This loan is a $225.0 million construction facility, with reductions in interest cost based on meeting certain conditions. Advances under the loan are subject to incurred costs and funded equity requirements.

As of September 30, 2023 and December 31, 2022, the gross book value of the properties collateralizing the mortgages and other loans payable was approximately $1.9 billion and $3.8 billion, respectively.

Corporate Indebtedness

2021 Credit Facility

In December 2021, we entered into an amended and restated credit facility, referred to as the 2021 credit facility, that was previously amended by the Company in November 2017, and was originally entered into by the Company in November 2012. As of September 30, 2023, the 2021 credit facility consisted of a $1.25 billion revolving credit facility, a $1.05 billion term loan (or "Term Loan A"), and a $200.0 million term loan (or "Term Loan B") with maturity dates of May 15, 2026, May 15, 2027, and November 21, 2024, respectively. The revolving credit facility has two six-month, as-of-right extension options to May 15, 2027. We also have an option, subject to customary conditions, to increase the capacity of the credit facility to $4.5 billion at any time prior to the maturity dates for the revolving credit facility and term loans without the consent of existing lenders, by obtaining additional commitments from our existing lenders and other financial institutions.

As of September 30, 2023, the 2021 credit facility bore interest at a spread over adjusted Term SOFR plus 10 basis points with an interest period of one or three months, as we may elect, ranging from (i) 72.5 basis points to 140 basis points for loans under the revolving credit facility, (ii) 80 basis points to 160 basis points for loans under Term Loan A, and (iii) 85 basis points to 165 basis points for loans under Term Loan B, in each case based on the credit rating assigned to the senior unsecured long term indebtedness of the Company. In instances where there are either only two ratings available or where there are more than two and the difference between them is one rating category, the applicable rating shall be the highest rating. In instances where there are more than two ratings and the difference between the highest and the lowest is two or more rating categories, then the applicable rating used is the average of the highest two, rounded down if the average is not a recognized category.

As of September 30, 2023, the applicable spread over adjusted Term SOFR plus 10 basis points for the 2021 credit facility was 140 basis points for the revolving credit facility, 160 basis points for Term Loan A, and 165 basis points for Term Loan B. 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 the Company. As of September 30, 2023, the facility fee was 30 basis points.

As of September 30, 2023, we had $2.0 million of outstanding letters of credit, $400.0 million drawn under the revolving credit facility and $1.25 billion outstanding under the term loan facilities, with total undrawn capacity of $850.0 million under the 2021 credit facility. As of September 30, 2023 and December 31, 2022, the revolving credit facility had a carrying value of $394.4 million and $443.2 million, respectively, net of deferred financing costs. As of September 30, 2023 and December 31, 2022, the term loan facilities had a carrying value of $1.2 billion and $1.2 billion, respectively, net of deferred financing costs.

The Company and the Operating Partnership are borrowers jointly and severally obligated under the 2021 credit facility.

The 2021 credit facility includes certain restrictions and covenants (see Restrictive Covenants below).

2022 Term Loan

In October 2022, we entered into a term loan agreement, referred to as the 2022 term loan. In September 2023, the 2022 term loan was repaid in full. The 2022 term loan consisted of a $425.0 million term loan with a maturity date of October 6, 2023. The 2022 term loan had one six-month as-of-right extension option to April 6, 2024. We also had an option, subject to customary conditions, to increase the capacity of the 2022 term loan to $500.0 million on or before January 7, 2023 without the consent of existing lenders, by obtaining additional commitments from our existing lenders and other financial institutions. In January 2023, the 2022 term loan was increased by $25.0 million to $425.0 million.

The 2022 term loan bore interest at a spread over adjusted Term SOFR plus 10 basis points, ranging from 100 basis points to 180 basis points, in each case based on the credit rating assigned to the senior unsecured long-term indebtedness of the Company. In instances where there were either only two ratings available or where there was more than two and the difference between them was one rating category, the applicable rating was the highest rating. In instances where there were more than two ratings and the difference between the highest and the lowest were two or more rating categories, then the applicable rating used was the average of the highest two, rounded down if the average was not a recognized category. As of December 31, 2022, the 2022 term loan had a carrying value of $398.2 million, net of deferred financing costs.

The Company and the Operating Partnership were borrowers jointly and severally obligated under the 2022 term loan.

Senior Unsecured Notes

The following table sets forth our senior unsecured notes and other related disclosures as of September 30, 2023 and December 31, 2022, respectively, by scheduled maturity date (dollars in thousands):


Issuance	September 30, 2023 Unpaid Principal Balance		September 30, 2023 Accreted Balance		December 31, 2022 Accreted Balance		Interest Rate (1)			Initial Term (in Years)	Maturity Date
December 17, 2015 (2)	$	100,000	$	100,000	$	100,000		4.27	%	10	December 2025


	$	100,000	$	100,000	$	100,000
Deferred financing costs, net	—		(231)		(308)
	$	100,000	$	99,769	$	99,692

(1)Interest rate as of September 30, 2023.

(2)Issued by the Company and the Operating Partnership as co-obligors.

Restrictive Covenants

The terms of the 2021 credit facility and 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 September 30, 2023 and December 31, 2022, 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 a floating rate of 26 basis points over three-month Term SOFR. 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, the 2021 credit facility, the 2022 term loan, trust preferred securities, senior unsecured notes and our share of joint venture debt as of September 30, 2023, including as-of-right extension options, were as follows (in thousands):


	Scheduled Amortization		Principal		Revolving Credit Facility		Unsecured Term Loans		Trust Preferred Securities		Senior Unsecured Notes		Total		Joint Venture Debt
Remaining 2023	$	1,486	$	260,149	$	—	$	—	$	—	$	—	$	261,635	$	525,028
2024	4,488		332,749		—		200,000		—		—		537,237		1,318,885
2025	—		370,000		—		—		—		100,000		470,000		1,618,381
2026	—		—		—		—		—		—		—		563,977
2027	—		550,000		400,000		1,000,000		—		—		1,950,000		1,189,059
Thereafter	—		—		—		50,000		100,000		—		150,000		2,130,404
	$	5,974	$	1,512,898	$	400,000	$	1,250,000	$	100,000	$	100,000	$	3,368,872	$	7,345,734

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


	Three Months Ended September 30,				Nine Months Ended September 30,
	2023		2022		2023		2022
Interest expense before capitalized interest	$	52,877	$	40,553	$	183,652	$	105,165
Interest on financing leases	1,113		1,099		3,329		3,453
Interest capitalized	(25,483)		(19,659)		(77,916)		(55,952)
Amortization of discount on assumed debt	—		—		2,842		—
Interest income	(1,067)		(169)		(2,193)		(812)
Interest expense, net	$	27,440	$	21,824	$	109,714	$	51,854

- Definition

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Subparagraph (h)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481139/470-20-50-1B

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(c))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 470
-Name Accounting Standards Codification
-Publisher FASB
-URI https://asc.fasb.org//470/tableOfContent

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481139/470-20-50-1B

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Subparagraph (g)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481139/470-20-50-1B

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Subparagraph (i)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481139/470-20-50-1B

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1C
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481139/470-20-50-1C

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1C
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481139/470-20-50-1C

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1C
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481139/470-20-50-1C

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1E
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481139/470-20-50-1E

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1I
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481139/470-20-50-1I

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1I
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481139/470-20-50-1I

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1I
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481139/470-20-50-1I

+ Details

Corporate Indebtedness

9 Months Ended

Sep. 30, 2023

Debt Disclosure [Abstract]

Corporate Indebtedness

Mortgages and Other Loans Payable


Property	Maturity Date	Final Maturity Date (1)	Interest Rate (2)		September 30, 2023		December 31, 2022
Fixed Rate Debt:

7 Dey / 185 Broadway (3)	November 2023	November 2023		7.59%	$	200,000	$	200,000
420 Lexington Avenue	October 2024	October 2040		3.99%	278,724		283,064
100 Church Street	June 2025	June 2027		5.89%	370,000		370,000
Landmark Square	January 2027	January 2027		4.90%	100,000		100,000
485 Lexington Avenue	February 2027	February 2027		4.25%	450,000		450,000
245 Park Avenue					—		1,712,750
Total fixed rate debt					$	1,398,724	$	3,115,814
Floating Rate Debt:
7 Dey / 185 Broadway (3)	November 2023	November 2023	S+	2.85%	$	10,148	$	10,148
690 Madison Avenue	July 2024	July 2025	S+	0.50%	60,000		60,000
719 Seventh Avenue	December 2024	December 2024	S+	1.31%	50,000		50,000
Total floating rate debt					$	120,148	$	120,148


Total mortgages and other loans payable					$	1,518,872	$	3,235,962
Deferred financing costs, net of amortization					(6,126)		(8,399)
Total mortgages and other loans payable, net					$	1,512,746	$	3,227,563

(1)Reflects exercise of all available options. The ability to exercise extension options may be subject to certain tests based on the operating performance of the property.

Corporate Indebtedness

2021 Credit Facility

The Company and the Operating Partnership are borrowers jointly and severally obligated under the 2021 credit facility.

The 2021 credit facility includes certain restrictions and covenants (see Restrictive Covenants below).

2022 Term Loan

The Company and the Operating Partnership were borrowers jointly and severally obligated under the 2022 term loan.

Senior Unsecured Notes


Issuance	September 30, 2023 Unpaid Principal Balance		September 30, 2023 Accreted Balance		December 31, 2022 Accreted Balance		Interest Rate (1)			Initial Term (in Years)	Maturity Date
December 17, 2015 (2)	$	100,000	$	100,000	$	100,000		4.27	%	10	December 2025


	$	100,000	$	100,000	$	100,000
Deferred financing costs, net	—		(231)		(308)
	$	100,000	$	99,769	$	99,692

(1)Interest rate as of September 30, 2023.

(2)Issued by the Company and the Operating Partnership as co-obligors.

Restrictive Covenants

Junior Subordinated Deferrable Interest Debentures

Principal Maturities


	Scheduled Amortization		Principal		Revolving Credit Facility		Unsecured Term Loans		Trust Preferred Securities		Senior Unsecured Notes		Total		Joint Venture Debt
Remaining 2023	$	1,486	$	260,149	$	—	$	—	$	—	$	—	$	261,635	$	525,028
2024	4,488		332,749		—		200,000		—		—		537,237		1,318,885
2025	—		370,000		—		—		—		100,000		470,000		1,618,381
2026	—		—		—		—		—		—		—		563,977
2027	—		550,000		400,000		1,000,000		—		—		1,950,000		1,189,059
Thereafter	—		—		—		50,000		100,000		—		150,000		2,130,404
	$	5,974	$	1,512,898	$	400,000	$	1,250,000	$	100,000	$	100,000	$	3,368,872	$	7,345,734

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


	Three Months Ended September 30,				Nine Months Ended September 30,
	2023		2022		2023		2022
Interest expense before capitalized interest	$	52,877	$	40,553	$	183,652	$	105,165
Interest on financing leases	1,113		1,099		3,329		3,453
Interest capitalized	(25,483)		(19,659)		(77,916)		(55,952)
Amortization of discount on assumed debt	—		—		2,842		—
Interest income	(1,067)		(169)		(2,193)		(812)
Interest expense, net	$	27,440	$	21,824	$	109,714	$	51,854

- Definition

+ References

+ Details

Consolidated Statements of Capital - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Increase (Decrease) in Partner's Capital
Acquisition of subsidiary interest from noncontrolling interest		$ (29,817)		$ (29,817)
DRSPP proceeds	$ 97	140	$ 439	339
Reallocation of noncontrolling interest in the Operating Partnership	3,126	28,624	(8,072)	23,539
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings	7,957	8,616	22,961	22,147
Repurchases of common units				(151,197)
Contribution to consolidated joint venture interests	3,266	817	11,714	52,164
Cash distributions to noncontrolling interests	$ (851)	$ (148)	$ (1,614)	$ (3,168)
Common Stock
Increase (Decrease) in Partner's Capital
DRSPP proceeds (in shares)	3	3	15	6
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings (in shares)	8	11	3	215
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings				$ 3
Repurchases of common units (in units)				(1,971)
Repurchases of common units				$ (20)
Noncontrolling Interests
Increase (Decrease) in Partner's Capital
Acquisition of subsidiary interest from noncontrolling interest		(75)		(75)
Contribution to consolidated joint venture interests	3,266	817	$ 11,714	52,164
Cash distributions to noncontrolling interests	(851)	(148)	(1,614)	(3,168)
SL Green Operating Partnership
Increase (Decrease) in Partner's Capital
Beginning balance	4,159,833	4,748,764	4,646,922	4,778,253	$ 4,778,253
Net income (loss)	(22,023)	10,122	(417,138)	(15,266)
Acquisition of subsidiary interest from noncontrolling interest		(29,817)		(29,817)
Other comprehensive income	11,847	48,979	20,012	104,332
Preferred distributions	(3,738)	(3,738)	(11,213)	(11,213)
DRSPP proceeds	97	140	439	339
Reallocation of noncontrolling interest in the Operating Partnership	3,126	28,624	(8,072)	23,539
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings	7,957	8,616	22,961	22,147
Repurchases of common units				(151,197)
Contribution to consolidated joint venture interests	3,266	817	11,714	52,164
Cash distributions to noncontrolling interests	(851)	(148)	(1,614)	(3,168)
Issuance of special distribution paid primarily in units				160,620
Cash distributions declared	(52,271)	(60,138)	(156,768)	(178,512)
Ending balance	4,107,243	4,752,221	4,107,243	4,752,221	4,646,922
SL Green Operating Partnership \| Series I Preferred Units \| Series I Preferred Stock
Increase (Decrease) in Partner's Capital
Beginning balance	221,932	221,932	221,932	221,932	221,932
Ending balance	221,932	221,932	221,932	221,932	221,932
SL Green Operating Partnership \| Common Stock \| Partners' Interest
Increase (Decrease) in Partner's Capital
Beginning balance	$ 3,813,223	$ 4,453,271	$ 4,313,497	$ 4,589,702	$ 4,589,702
Beginning balance (units)	64,387	64,302	64,380	64,105	64,105
Net income (loss)	$ (20,229)	$ 11,115	$ (412,679)	$ (17,535)
Acquisition of subsidiary interest from noncontrolling interest		(29,742)		(29,742)
Preferred distributions	$ (3,738)	$ (3,738)	$ (11,213)	$ (11,213)
DRSPP proceeds (in shares)	3	3	15	6
DRSPP proceeds	$ 97	$ 140	$ 439	$ 339
Reallocation of noncontrolling interest in the Operating Partnership	$ 3,126	$ 28,624	$ (8,072)	$ 23,539
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings (in shares)	8	11	3	215
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings	$ 7,957	$ 8,616	$ 22,961	$ 22,147
Repurchases of common units (in units)				(1,971)
Repurchases of common units				$ (151,197)
Issuance of special distribution paid primarily in units (in shares)				1,961
Issuance of special distribution paid primarily in units				$ 160,620
Cash distributions declared	(52,271)	(60,138)	(156,768)	(178,512)
Ending balance	$ 3,748,165	$ 4,408,148	$ 3,748,165	$ 4,408,148	$ 4,313,497
Ending balance (units)	64,398	64,316	64,398	64,316	64,380
SL Green Operating Partnership \| Accumulated Other Comprehensive Loss
Increase (Decrease) in Partner's Capital
Beginning balance	$ 57,769	$ 8,595	$ 49,604	$ (46,758)	$ (46,758)
Other comprehensive income	11,847	48,979	20,012	104,332
Ending balance	69,616	57,574	69,616	57,574	49,604
SL Green Operating Partnership \| Noncontrolling Interests
Increase (Decrease) in Partner's Capital
Beginning balance	66,909	64,966	61,889	13,377	13,377
Net income (loss)	(1,794)	(993)	(4,459)	2,269
Acquisition of subsidiary interest from noncontrolling interest		(75)		(75)
Contribution to consolidated joint venture interests	3,266	817	11,714	52,164
Cash distributions to noncontrolling interests	(851)	(148)	(1,614)	(3,168)
Ending balance	$ 67,530	$ 64,567	$ 67,530	$ 64,567	$ 61,889

Consolidated Statements of Equity (Parenthetical) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Statement of Stockholders' Equity [Abstract]
Cash distributions declared (per common unit, none of which represented a return of capital for federal income tax purposes) (in dollars per share)	$ 0.812	$ 0.932	$ 2.437	$ 2.797

Share-based Compensation (Tables)

9 Months Ended

Sep. 30, 2023

Share-Based Payment Arrangement [Abstract]

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


	September 30, 2023			December 31, 2022
	Options Outstanding	Weighted Average Exercise Price		Options Outstanding	Weighted Average Exercise Price
Balance at beginning of period	313,480	$	97.59	394,089	$	100.56

Exercised	—	—		—	—
Lapsed or canceled	(120,000)	79.56		(80,609)	112.14
Balance at end of period	193,480	$	99.03	313,480	$	97.59
Options exercisable at end of period	193,480	$	99.03	313,480	$	97.59

Summary of restricted stock and charges during the period


	September 30, 2023		December 31, 2022
Balance at beginning of period	3,758,174		3,459,363
Granted	13,000		314,995
Canceled	(1,650)		(16,184)
Balance at end of period	3,769,524		3,758,174
Vested during the period	145,415		118,255
Compensation expense recorded	$	5,782,841	$	10,133,905
Total fair value of restricted stock granted during the period	$	483,860	$	16,804,931

Investments in Unconsolidated Joint Ventures (Tables)

9 Months Ended

Sep. 30, 2023

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 September 30, 2023:


Property	Partner	Ownership Interest (1)	Economic Interest (1)	Unaudited Approximate Square Feet
100 Park Avenue	Prudential Real Estate Investors	49.90%	49.90%	834,000
717 Fifth Avenue	Wharton Properties / Private Investor	10.92%	10.92%	119,500
800 Third Avenue	Private Investors	60.52%	60.52%	526,000
919 Third Avenue	New York State Teacher's Retirement System	51.00%	51.00%	1,454,000
11 West 34th Street	Private Investor / Wharton Properties	30.00%	30.00%	17,150
280 Park Avenue	Vornado Realty Trust	50.00%	50.00%	1,219,158
1552-1560 Broadway (2)	Wharton Properties	50.00%	50.00%	57,718
10 East 53rd Street	Canadian Pension Plan Investment Board	55.00%	55.00%	354,300
21 East 66th Street (3)	Private Investors	32.28%	32.28%	13,069
650 Fifth Avenue (4)	Wharton Properties	50.00%	50.00%	69,214
11 Madison Avenue	PGIM Real Estate	60.00%	60.00%	2,314,000
One Vanderbilt Avenue	National Pension Service of Korea / Hines Interest LP	71.01%	71.01%	1,657,198
Worldwide Plaza	RXR Realty / New York REIT	24.95%	24.95%	2,048,725
1515 Broadway	Allianz Real Estate of America	56.87%	56.87%	1,750,000
2 Herald Square	Israeli Institutional Investor	51.00%	51.00%	369,000
115 Spring Street	Private Investor	51.00%	51.00%	5,218
15 Beekman (5)	A fund managed by Meritz Alternative Investment Management	20.00%	20.00%	221,884
85 Fifth Avenue	Wells Fargo	36.27%	36.27%	12,946
One Madison Avenue (6)	National Pension Service of Korea / Hines Interest LP / International Investor	25.50%	25.50%	1,048,700
220 East 42nd Street	A fund managed by Meritz Alternative Investment Management	51.00%	51.00%	1,135,000
450 Park Avenue (7)	Korean Institutional Investor / Israeli Institutional Investor	50.10%	25.10%	337,000
5 Times Square	RXR Realty led investment group	31.55%	31.55%	1,131,735
245 Park Avenue (8)	U.S. Affiliate of Mori Trust Co., Ltd	50.10%	50.10%	1,782,793
625 Madison Avenue (9)	Private Investor	90.43%	90.43%	563,000

(2)The joint venture that owns 1552 Broadway also owns a long-term leasehold interest in the retail space and certain other spaces at 1560 Broadway, which is adjacent to 1552 Broadway.

(4)The joint venture owns a long-term leasehold interest in the retail space at 650 Fifth Avenue.

(5)In 2020, the Company formed a joint venture, which then entered into a long-term sublease with the Company.

Disposition of Joint Venture Interests or Properties

The following table summarizes the investments in unconsolidated joint ventures sold during the nine months ended September 30, 2023:


Property	Ownership Interest Disposed	Disposition Date	Gross Asset Valuation (in millions)		Loss on Sale (in millions) (1)
121 Greene Street	50.0%	February 2023	$	14.0	$	(0.3)

(1)Represents the Company's share of the loss.

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

The mortgage notes and other loans payable collateralized by the respective joint venture properties and assignment of leases as of September 30, 2023 and December 31, 2022, respectively, are as follows (dollars in thousands):


Property	Economic Interest (1)		Maturity Date	Final Maturity Date (2)	Interest Rate (3)		September 30, 2023		December 31, 2022
Fixed Rate Debt:
717 Fifth Avenue	10.92	%	July 2022 (4)	July 2022 (4)		5.02%	$	655,328	$	655,328
650 Fifth Avenue	50.00	%	October 2023 (6)	January 2024		5.45%	65,000		65,000
220 East 42nd Street	51.00	%	June 2024	June 2025		5.86%	505,412		510,000
5 Times Square	31.55	%	September 2024	September 2026		7.07%	434,816		400,000
10 East 53rd Street	55.00	%	February 2025	February 2025		5.45%	220,000		220,000
1515 Broadway	56.87	%	March 2025	March 2025		3.93%	767,179		782,321
115 Spring Street	51.00	%	March 2025	March 2025		5.50%	65,550		—
450 Park Avenue	25.10	%	June 2025	June 2027		6.10%	267,000		267,000
11 Madison Avenue	60.00	%	September 2025	September 2025		3.84%	1,400,000		1,400,000
One Madison Avenue (5)	25.50	%	November 2025	November 2026		3.59%	662,663		467,008
800 Third Avenue	60.52	%	February 2026	February 2026		3.37%	177,000		177,000
919 Third Avenue	51.00	%	April 2026	April 2028		6.11%	500,000		500,000
625 Madison Avenue	90.43	%	December 2026	December 2026		6.05%	223,200		—
245 Park Avenue	50.10	%	June 2027	June 2027		4.30%	1,768,000		—
Worldwide Plaza	24.95	%	November 2027	November 2027		3.98%	1,200,000		1,200,000
One Vanderbilt Avenue	71.01	%	July 2031	July 2031		2.95%	3,000,000		3,000,000
280 Park Avenue									1,200,000
21 East 66th Street							—		12,000
Total fixed rate debt							$	11,911,148	$	10,855,657
Floating Rate Debt:
11 West 34th Street	30.00	%	February 2023 (4)	February 2023 (4)	L+	1.45%	$	23,000	$	23,000
650 Fifth Avenue	50.00	%	October 2023 (6)	January 2024	S+	2.25%	210,000		210,000
2 Herald Square	51.00	%	November 2023	November 2023	S+	2.06%	182,500		182,500
100 Park Avenue	49.90	%	December 2023	December 2025	S+	2.36%	360,000		360,000
15 Beekman (7)	20.00	%	January 2024	July 2025	S+	1.61%	123,168		86,738
1552 Broadway	50.00	%	February 2024	February 2024	S+	2.75%	193,132		193,132
280 Park Avenue	50.00	%	September 2024	September 2024	S+	2.03%	1,200,000		—
5 Times Square	31.55	%	September 2024	September 2026	S+	5.69%	604,598		495,924
21 East 66th Street	32.28	%	April 2027	April 2027	S+	1.75%	12,000		—
21 East 66th Street	32.28	%	June 2033	June 2033	T+	2.75%	555		586
115 Spring Street							—		65,550
121 Greene Street							—		12,550
Total floating rate debt							$	2,908,953	$	1,629,980
Total joint venture mortgages and other loans payable							$	14,820,101	$	12,485,637
Deferred financing costs, net							(112,175)		(136,683)
Total joint venture mortgages and other loans payable, net							$	14,707,926	$	12,348,954

(4)As of the date of this filing, the loan is in maturity default. The Company is in discussions with the lender on a resolution.

(7)This loan is a $125.0 million construction facility. Advances under the loan are subject to costs incurred.

Schedule of combined balance sheets for the unconsolidated joint ventures

The combined balance sheets for the unconsolidated joint ventures, at September 30, 2023 and December 31, 2022 are as follows (in thousands):


	September 30, 2023		December 31, 2022
Assets (1)
Commercial real estate property, net	$	18,667,334	$	15,989,642
Cash and restricted cash	691,274		709,299
Tenant and other receivables, related party receivables, and deferred rents receivable	668,137		601,552

Other assets	2,656,613		2,551,426
Total assets	$	22,683,358	$	19,851,919
Liabilities and equity (1)
Mortgages and other loans payable, net	$	14,707,926	$	12,348,954
Deferred revenue	1,156,816		1,077,901
Lease liabilities	993,041		1,000,356
Other liabilities	444,208		456,537
Equity	5,381,367		4,968,171
Total liabilities and equity	$	22,683,358	$	19,851,919
Company's investments in unconsolidated joint ventures	$	3,152,752	$	3,190,137

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 nine months ended September 30, 2023 and 2022, are as follows (in thousands):


	Three Months Ended September 30,				Nine Months Ended September 30,
	2023		2022		2023		2022
Total revenues	$	407,148	$	330,705	$	1,140,889	$	997,670
Operating expenses	63,081		59,841		183,825		173,327
Real estate taxes	78,564		66,594		210,428		186,710
Operating lease rent	7,307		6,616		21,746		19,465
Interest expense, net of interest income	162,897		112,747		421,528		305,977
Amortization of deferred financing costs	6,897		7,116		21,140		20,568

Depreciation and amortization	138,199		116,511		380,867		343,183
Total expenses	456,945		369,425		1,239,534		1,049,230
Loss on early extinguishment of debt	—		—		—		(467)
Net loss before gain (loss) on sale	$	(49,797)	$	(38,720)	$	(98,645)	$	(52,027)
Company's equity in net loss from unconsolidated joint ventures	$	(15,126)	$	(21,997)	$	(44,470)	$	(31,262)

Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2023

Accounting Policies [Abstract]

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


	September 30, 2023		December 31, 2022
Identified intangible assets (included in other assets):
Gross amount	$	189,680	$	403,552
Accumulated amortization	(184,491)		(190,066)
Net	$	5,189	$	213,486
Identified intangible liabilities (included in deferred revenue):
Gross amount	$	205,394	$	361,338
Accumulated amortization	(202,000)		(212,191)
Net	$	3,394	$	149,147

Schedule of marketable securities

As of September 30, 2023 and December 31, 2022, we held the following marketable securities (in thousands):


	September 30, 2023		December 31, 2022
Commercial mortgage-backed securities	$	9,616	$	11,240



Total investment in marketable securities	$	9,616	$	11,240

Schedules of concentration of risk, by risk factor


Property			Three months ended September 30, 2023
One Vanderbilt Avenue			15.6%
11 Madison Avenue			8.3%
420 Lexington Ave			6.8%
1515 Broadway			6.4%
245 Park Avenue			5.7%
280 Park Avenue			5.7%
1185 Avenue of the Americas			5.5%

- Definition

Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-9

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-3

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
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-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
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Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 9: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 12: http://www.xbrl.org/2009/role/commonPracticeRef
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-3

+ Details

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

9 Months Ended

Sep. 30, 2023

Noncontrolling Interest [Abstract]

Schedule of noncontrolling interest

Below is a summary of the activity relating to the noncontrolling interests in the Operating Partnership for the nine months ended September 30, 2023 and the twelve months ended December 31, 2022 (in thousands):


	September 30, 2023		December 31, 2022
Balance at beginning of period	$	269,993	$	344,252
Distributions	(11,225)		(16,272)
Issuance of common units	16,350		22,855
Redemption and conversion of common units	(8,900)		(40,901)
Net loss	(27,493)		(5,794)
Accumulated other comprehensive (loss) income allocation	1,425		5,827
Fair value adjustment	8,072		(39,974)
Balance at end of period	$	248,222	$	269,993

Schedule of preferred unit activity

Below is a summary of the preferred units of limited partnership interest in the Operating Partnership as of September 30, 2023:


Issuance	Stated Distribution Rate		Number of Units Authorized	Number of Units Issued	Number of Units Outstanding	Annual Dividend Per Unit(1)		Liquidation Preference Per Unit(2)		Conversion Price Per Unit(3)		Date of Issuance
Series A (4)	5.00	%	109,161	109,161	109,161	$	50.0000	$	1,000.00	$	—	August 2015
Series F	7.00	%	60	60	60	70.0000		1,000.00		29.12		January 2007
Series K	3.50	%	700,000	563,954	341,677	0.8750		25.00		134.67		August 2014
Series L	4.00	%	500,000	378,634	372,634	1.0000		25.00		—		August 2014
Series R	3.50	%	400,000	400,000	400,000	0.8750		25.00		154.89		August 2015
Series S	4.00	%	1,077,280	1,077,280	1,077,280	1.0000		25.00		—		August 2015
Series V (5)	5.00	%	40,000	40,000	40,000	1.2500		25.00		—		May 2019
Series W (6)	(6)		1	1	1	(6)		(6)		(6)		January 2020

(1)Dividends are cumulative, subject to certain provisions.

(2)Units are redeemable at any time at par for cash at the option of the unit holder unless otherwise specified.

(3)If applicable, 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) the amount shown in the table.

(4)Issued through a consolidated subsidiary. The units are convertible on a one-for-one basis, into the Series B Preferred Units of limited partnership interest, or the Subsidiary Series B Preferred Units. The Subsidiary Series B Preferred Units can be converted at any time after July 15, 2024 at the option of the unitholder, into a number of common stock equal to 6.71348 shares of common stock for each Subsidiary Series B Preferred Unit. As such, no Subsidiary Series B Preferred Units have been issued as of September 30, 2023.

(5)The Series V Preferred Units are redeemable at any time after January 1, 2025 at par for cash at the option of the unit holder.

(6)The Series W preferred unit was issued in January 2020 in exchange for the then-outstanding Series O preferred unit. The holder of the Series W preferred unit is entitled to quarterly dividends in an amount calculated as (i) 1,350 multiplied by (ii) the current distribution per common unit of limited partnership in SL Green Operating Partnership. The holder has the right to require the Operating Partnership to repurchase the Series W unit for cash, or convert the Series W unit for Class B units, in each case at a price that is determined based on the closing price of the Company's common stock at the time such right is exercised. The unit's liquidation preference is the fair market value of the unit plus accrued distributions at the time of a liquidation event.

Below is a summary of the activity relating to the preferred units in the Operating Partnership for the nine months ended September 30, 2023 and the twelve months ended December 31, 2022 (in thousands):


	September 30, 2023		December 31, 2022
Balance at beginning of period	$	177,943	$	196,075
Issuance of preferred units	—		—
Redemption of preferred units	(11,700)		(17,967)
Dividends paid on preferred units	(4,582)		(6,198)
Accrued dividends on preferred units	4,840		6,033
Balance at end of period	$	166,501	$	177,943

Segment Information - Additional Information (Details)
$ in Thousands

3 Months Ended

9 Months Ended

Sep. 30, 2023

USD ($)

Sep. 30, 2022

USD ($)

Sep. 30, 2023

USD ($)

segment

Sep. 30, 2022

USD ($)

Dec. 31, 2022

USD ($)

Segment information

Number of reportable segments | segment

Total revenues

$ 173,220

$ 212,456

$ 617,865

$ 601,865

Net (loss) income

(21,694)

12,211

(439,279)

(12,253)

Total assets

^[1]

9,690,582

$ 12,355,794

Marketing, general and administrative

22,873

21,276

69,132

69,574

Operating Segments | Real Estate Segment

Segment information

Total revenues

163,531

182,943

590,016

532,057

Net (loss) income

(22,282)

(8,934)

(446,005)

(65,824)

Total assets

9,354,243

11,727,418

Operating Segments | Debt and Preferred Equity Segment

Segment information

Total revenues

9,689

29,513

27,849

69,808

Net (loss) income

588

$ 21,145

6,726

$ 53,571

Total assets

$ 336,339

$ 628,376

[1]

- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

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- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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+ Details

Related Party Transactions (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
	Dec. 31, 2016	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Related Party Transactions
Profit participation from related party		$ 12,540	$ 19,991	$ 58,038	$ 57,842
Costs inclusive of capitalized expenses		166	292	1,083	321
Operating lease rent		7,253	7,388	20,209	20,429
Rental revenue, net		150,991	162,952	531,978	474,215
Related party receivables		9,723		9,723		$ 27,352
One Vanderbilt Avenue
Related Party Transactions
Operating lease rent		700	700	2,200	2,200
SUMMIT One Vanderbilt
Related Party Transactions
Operating lease rent		17,000	8,300	31,100	26,000
Rental revenue, net		11,700	5,500	$ 21,000	17,400
Holiday And Mathias \| One Vanderbilt Avenue
Related Party Transactions
Stabilization of property, within three years after stabilization, percent						50.00%
Stabilization period				3 years
Stabilization of property, three years or more after stabilization, percent				100.00%
Stabilization of property, anniversary period				7 years
Holiday \| Payment Of Interest Acquired \| One Vanderbilt Avenue
Related Party Transactions
Stabilization of property, liquidation value, amount monetized	$ 1,400
Holiday \| Property Interest Liquidation \| One Vanderbilt Avenue
Related Party Transactions
Stabilization of property, liquidation value, amount monetized						$ 17,900
Mathias \| Payment Of Interest Acquired \| One Vanderbilt Avenue
Related Party Transactions
Stabilization of property, liquidation value, amount monetized	$ 1,000
Mathias \| Property Interest Liquidation \| One Vanderbilt Avenue
Related Party Transactions
Stabilization of property, liquidation value, amount monetized						11,900
Related Party
Related Party Transactions
Profit participation from related party			0		1,400
Costs inclusive of capitalized expenses			0		8,600
Related party receivables		9,723		$ 9,723		27,352
Joint venture
Related Party Transactions
Operating lease rent		7,307	$ 6,616	21,746	$ 19,465
Related party receivables		8,219		8,219		26,812
Other Affiliates
Related Party Transactions
Related party receivables		$ 1,504		$ 1,504		$ 540
Minimum \| Holiday \| One Vanderbilt Avenue
Related Party Transactions
Percentage of profits due to investors (as a percentage)	1.50%
Minimum \| Mathias \| One Vanderbilt Avenue
Related Party Transactions
Percentage of profits due to investors (as a percentage)	1.00%
Maximum \| Holiday \| One Vanderbilt Avenue
Related Party Transactions
Percentage of profits due to investors (as a percentage)	1.80%
Maximum \| Mathias \| One Vanderbilt Avenue
Related Party Transactions
Percentage of profits due to investors (as a percentage)	1.20%

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Stockholders' Equity of the Company (Tables)

9 Months Ended

Sep. 30, 2023

Stockholders' Equity Note [Abstract]

Class of treasury stock

As of September 30, 2023, share repurchases executed under the program, excluding the redemption of OP units, were as follows:


Period	Shares repurchased(1)	Average price paid per share	Cumulative number of shares repurchased as part of the repurchase plan or programs
Year ended 2020	8,276,032	$64.30	29,661,978
Year ended 2021	4,474,649	$75.44	34,136,627
Year ended 2022	1,971,092	$76.69	36,107,719

(1)There were no share repurchases during the nine months ended September 30, 2023.

Schedule of common stock issued and proceeds received dividend reinvestments


	Three Months Ended September 30,				Nine Months Ended September 30,
	2023		2022		2023		2022
Shares of common stock issued	2,695		2,933		14,736		5,827
Dividend reinvestments/stock purchases under the DRSPP	$	97	$	140	$	439	$	339

Schedule of earnings per share

SL Green's earnings per share for the three and nine months ended September 30, 2023 and 2022 are computed as follows (in thousands):


	Three Months Ended September 30,				Nine Months Ended September 30,
Numerator	2023		2022		2023		2022
Basic Earnings:
(Loss) income attributable to SL Green common stockholders	$	(23,967)	$	7,377	$	(423,892)	$	(28,748)
Less: distributed earnings allocated to participating securities	(408)		(505)		(1,225)		(1,516)

Net (loss) income attributable to SL Green common stockholders (numerator for basic earnings per share)	$	(24,375)	$	6,872	$	(425,117)	$	(30,264)
Add back: dilutive effect of earnings allocated to participating securities and contingently issuable shares	—		505		—		(484)

Add back: effect of dilutive securities (redemption of units to common shares)	(1,574)		491		(27,493)		(1,831)
Net (loss) income attributable to SL Green common stockholders (numerator for diluted earnings per share)	$	(25,949)	$	7,868	$	(452,610)	$	(32,579)


	Three Months Ended September 30,		Nine Months Ended September 30,
Denominator	2023	2022	2023	2022
Basic Shares:
Weighted average common stock outstanding	64,114	63,949	64,099	63,971
Effect of Dilutive Securities:
Operating Partnership units redeemable for common shares	4,182	4,088	4,175	4,104
Stock-based compensation plans	—	860	—	1,052
Contingently issuable shares	—	—	—	122
Diluted weighted average common stock outstanding	68,296	68,897	68,274	69,249

Consolidated Balance Sheets - USD ($)
$ in Thousands

Sep. 30, 2023

Dec. 31, 2022

Commercial real estate properties, at cost:

Land and land interests

$ 1,090,370

$ 1,576,927

Building and improvements

3,605,247

4,903,776

Building leasehold and improvements

1,343,386

1,691,831

Right of use asset - operating leases

953,236

1,026,265

Total commercial real estate properties, at cost

6,992,239

9,198,799

Less: accumulated depreciation

(1,997,942)

(2,039,554)

Total commercial real estate properties, net

4,994,297

7,159,245

Cash and cash equivalents

189,750

203,273

Restricted cash

119,573

180,781

Investments in marketable securities

9,616

11,240

Tenant and other receivables

37,295

34,497

Related party receivables

9,723

27,352

Deferred rents receivable

262,808

257,887

Debt and preferred equity investments, net of discounts and deferred origination fees of $1,638 and $1,811 and allowances of $13,520 and $6,630 in 2023 and 2022, respectively

334,327

623,280

Investments in unconsolidated joint ventures

3,152,752

3,190,137

Deferred costs, net

108,370

121,157

Other assets

472,071

546,945

Total assets

^[1]

9,690,582

12,355,794

Liabilities

Mortgages and other loans payable, net

1,512,746

3,227,563

Revolving credit facility, net

394,368

443,217

Unsecured term loans, net

1,243,649

1,641,552

Unsecured notes, net

99,769

99,692

Accrued interest payable

17,934

14,227

Other liabilities

453,349

236,211

Accounts payable and accrued expenses

146,332

154,867

Deferred revenue

136,063

272,248

Lease liability - financing leases

105,198

104,218

Lease liability - operating leases

887,412

895,100

Dividend and distributions payable

21,725

21,569

Security deposits

50,071

50,472

Junior subordinated deferrable interest debentures held by trusts that issued trust preferred securities

100,000

Total liabilities

^[1]

5,168,616

7,260,936

Commitments and contingencies

Noncontrolling interests in Operating Partnership

248,222

269,993

Preferred units

166,501

177,943

Equity

Series I Preferred Stock, $0.01 par value, $25.00 liquidation preference, 9,200 issued and outstanding at both September 30, 2023 and December 31, 2022

221,932

Common stock, $0.01 par value, 160,000 shares authorized and 65,458 and 65,440 issued and outstanding at September 30, 2023 and December 31, 2022, respectively (including 1,060 and 1,060 shares held in treasury at September 30, 2023 and December 31, 2022, respectively)

656

Additional paid-in-capital

3,813,758

3,790,358

Treasury stock at cost

(128,655)

Accumulated other comprehensive income

69,616

49,604

Retained earnings

62,406

651,138

Total SL Green stockholders' equity

4,039,713

4,585,033

Noncontrolling interests in other partnerships

67,530

61,889

Total equity

4,107,243

4,646,922

Total liabilities and equity/capital

$ 9,690,582

$ 12,355,794

[1]

Stockholders' Equity of the Company - Perpetual Preferred Stock (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	9 Months Ended
	Aug. 31, 2012	Sep. 30, 2023	Dec. 31, 2022	Feb. 28, 2021
Stockholders' Equity
Common stock, shares authorized (in shares)		160,000,000	160,000,000
Series I Preferred Stock
Stockholders' Equity
Preferred stock, shares outstanding (in shares)		9,200,000	9,200,000
Preferred stock, distribution rate		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	$ 221.9
Dividend Reinvestment and Stock Purchase Plan (DRIP)
Stockholders' Equity
Common stock, shares authorized (in shares)				3,500,000

Debt and Preferred Equity Investments (Tables)

9 Months Ended

Sep. 30, 2023

Investments, Debt and Equity Securities [Abstract]

Schedule of debt and preferred equity book balance roll forward

Below is a summary of the activity in our debt and preferred equity investments for the nine months ended September 30, 2023 and the twelve months ended December 31, 2022 (in thousands):


	September 30, 2023		December 31, 2022
Balance at beginning of year (1)	$	623,280	$	1,088,723
Debt investment originations/fundings/accretion (2)	61,845		62,992
Preferred equity investment originations/accretion (2)	6,039		37,505
Redemptions/sales/syndications/equity ownership/amortization	(349,947)		(565,940)
Net change in loan loss reserves	(6,890)		—
Balance at end of period (1)	$	334,327	$	623,280

(1)Net of unamortized fees, discounts, and premiums.

(2)Accretion includes amortization of fees and discounts and paid-in-kind investment income.

Schedule of debt

Below is a summary of our debt and preferred equity investments as of September 30, 2023 (dollars in thousands):


	Floating Rate					Fixed Rate					Total Carrying Value		Senior Financing		Weighted Average Yield at End of Period	Maturity (1)
Type	Carrying Value		Face Value		Interest Rate	Carrying Value		Face Value		Interest Rate


Mezzanine Debt	$	158,430	$	158,604	S + 4.95% - 13.25%	$	50,000	$	64,985	7.00% - 14.30%	$	208,430	$	1,069,704	9.15%	2023 - 2029
Preferred Equity	—		—		—	125,897		125,897		6.5%	125,897		250,000		6.55%	2027
Balance at end of period	$	158,430	$	158,604		$	175,897	$	190,882		$	334,327	$	1,319,704

(1)Excludes available extension options to the extent they have not been exercised as of the date of this filing.

Allowance for credit losses on financing receivables

The following table is a roll forward of our total allowance for loan losses for the nine months ended September 30, 2023 and the twelve months ended December 31, 2022 (in thousands):


	September 30, 2023		December 31, 2022
Balance at beginning of year	$	6,630	$	6,630



Current period provision for loan loss	6,890		—

Balance at end of period (1)	$	13,520	$	6,630

(1)As of September 30, 2023, all debt and preferred equity investments on non-accrual had an allowance for loan loss except for one debt investment with a carrying value of $50.0 million.

Schedule of investment in financing receivables and risk rating

The following table sets forth the carrying value of our debt and preferred equity investment portfolio by risk rating as of September 30, 2023 and December 31, 2022 (dollars in thousands):


Risk Rating	September 30, 2023		December 31, 2022
1 - Low Risk Assets - Low probability of loss	$	207,156	$	264,069
2 - Watch List Assets - Higher potential for loss	127,171		352,321
3 - High Risk Assets - Loss more likely than not	—		6,890
	$	334,327	$	623,280

The following table sets forth the carrying value of our debt and preferred equity investment portfolio by year of origination and risk rating as of September 30, 2023 (dollars in thousands):


	As of September 30, 2023
Risk Rating	2023 (1)		2022 (1)		2021 (1)		Prior (1)(2)		Total
1 - Low Risk Assets - Low probability of loss	$	—	$	—	$	—	$	207,156	$	207,156
2 - Watch List Assets - Higher potential for loss	—		—		—		127,171		127,171
3 - High Risk Assets - Loss more likely than not	—		—		—		—		—
	$	—	$	—	$	—	$	334,327	$	334,327

(1)Year in which the investment was originated or acquired by us or in which a material modification occurred.

(2)During the nine months ended September 30, 2023, we recognized a $6.9 million provision for loan loss related to an investment originated prior to 2021.

Summary of debt investments

As of September 30, 2023 and December 31, 2022, we held the following debt investments with an aggregate weighted average current yield of 9.15% as of September 30, 2023 (dollars in thousands):


Loan Type	September 30, 2023 Future Funding Obligations		September 30, 2023 Senior Financing		September 30, 2023 Carrying Value (1)		December 31, 2022 Carrying Value (1)		Maturity Date (2)
Fixed Rate Investments:
Mezzanine Loan (3)(4)	$	—	$	105,000	$	13,366	$	13,366	June 2024
Mezzanine Loan	—		95,000		30,000		30,000		January 2025
Mezzanine Loan	—		85,000		20,000		20,000		December 2029
Mezzanine Loan (5)	—		—		—		225,367
Mezzanine Loan (5)	—		—		—		77,109
Total fixed rate	$	—	$	285,000	$	63,366	$	365,842
Floating Rate Investments:
Mezzanine Loan (6)	$	—	$	275,000	$	50,000	$	50,000	April 2023
Mezzanine Loan	3,761		54,000		8,243		8,243		November 2023
Mezzanine Loan	3,723		269,620		61,258		46,884		May 2024
Mezzanine Loan	—		186,084		39,083		39,083		January 2026
Total floating rate	$	7,484	$	784,704	$	158,584	$	144,210
Allowance for loan loss	$	—	$	—	$	(13,520)	$	(6,630)
Total	$	7,484	$	1,069,704	$	208,430	$	503,422

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

(2)Represents contractual maturity, excluding any extension options to the extent they have not been exercised as of the date of this filing.

(3)Carrying value is net of a $12.0 million participation that was sold and did not meet the conditions for sale accounting. That participation is included in Other assets and Other liabilities on the consolidated balance sheets as a result.

(4)This loan went into default and was put on non-accrual in June 2020 and remains on non-accrual as of September 30, 2023. No investment income has been recognized subsequent to it being put on non-accrual. In the first quarter of 2023, the Company fully reserved the balance of the investment. Additionally, we determined the borrower entity to be a VIE, in which we are not the primary beneficiary.

(5)In September 2023, following a UCC foreclosure, the Company converted its previous mezzanine debt investments in the fee interest at 625 Madison Avenue to a 90.43% ownership interest.

(6)This loan went into default and was put on non-accrual in January 2023 and remains on non-accrual as of September 30, 2023. No investment income has been recognized subsequent to it being put on non-accrual. The Company is in discussions with the borrower with respect to the loan.

Summary of preferred equity investments

As of September 30, 2023 and December 31, 2022, we held the following preferred equity investment with an aggregate weighted average current yield of 6.55% as of September 30, 2023 (dollars in thousands):


Type	September 30, 2023 Future Funding Obligations		September 30, 2023 Senior Financing		September 30, 2023 Carrying Value (1)		December 31, 2022 Carrying Value (1)		Mandatory Redemption (2)
Preferred Equity	$	—	$	250,000	$	125,897	$	119,858	February 2027

Allowance for loan loss	$	—	$	—	$	—	$	—
Total	$	—	$	250,000	$	125,897	$	119,858

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

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

Properties Held for Sale and Property Dispositions

9 Months Ended

Sep. 30, 2023

Discontinued Operations and Disposal Groups [Abstract]

Properties Held for Sale and Property Dispositions

Properties Held for Sale

As of September 30, 2023, no properties were classified as held for sale.

Property Dispositions

The following table summarizes the properties disposed of during the nine months ended September 30, 2023:

Property

Disposition Date

Property Type

Unaudited Approximate Usable Square Feet

Sales Price (1)

(in millions)

Loss on Sale (2)

(in millions)

245 Park Avenue (3)

June 2023

Fee Interest

1,782,793

1,995.0

(28.3)

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

(2)The loss on sale is net of $8.0 million of employee compensation accrued in connection with the realization of the investment. The amounts do not include adjustments for expenses recorded in periods subsequent to the quarter in which the disposition was consummated.

(3)In June 2023, the Company sold a 49.9% interest, which resulted in the Company no longer retaining a controlling interest in the entity, as defined in ASC 810, and deconsolidation of the 50.1% interest we retained. We recorded our retained investment at fair value which resulted in the recognition of a fair value adjustment of ($17.0 million), which is reflected in the Company's consolidated statements of operations within Purchase price and other fair value adjustments. See Note 6, "Investments in Unconsolidated Joint Venture."

Property Acquisitions - Schedule of 2022 Acquisitions (Details)	9 Months Ended
	Sep. 30, 2023 property
Business Combination and Asset Acquisition [Abstract]
Number of real estate properties acquired from third party	0

Partners' Capital of the Operating Partnership - EPS (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Numerator
Less: distributed earnings allocated to participating securities	$ (408)	$ (505)	$ (1,225)	$ (1,516)
Net (loss) income attributable to SLGOP common unitholders (numerator for basic earnings per unit)	(24,375)	6,872	(425,117)	(30,264)
Add back: dilutive effect of earnings allocated to participating securities and contingently issuable shares	0	(505)	0	484
Net (loss) income attributable to SL Green common stockholders, diluted	$ (25,949)	$ 7,868	$ (452,610)	$ (32,579)
Denominator
Common stock shares excluded from the diluted shares outstanding (shares)	1,402,771	621,134	1,380,364	517,574
SL Green Operating Partnership
Numerator
Net (loss) income attributable to SLGOP common unitholders (numerator for diluted earnings per unit)	$ (25,541)	$ 7,868	$ (451,385)	$ (30,579)
Less: distributed earnings allocated to participating securities	(408)	(505)	(1,225)	(1,516)
Net (loss) income attributable to SLGOP common unitholders (numerator for basic earnings per unit)	(25,949)	7,363	(452,610)	(32,095)
Add back: dilutive effect of earnings allocated to participating securities and contingently issuable shares	0	505	0	(484)
Net (loss) income attributable to SL Green common stockholders, diluted	$ (25,949)	$ 7,868	$ (452,610)	$ (32,579)
Denominator
Basic weighted average common units outstanding (in shares)	68,296,000	68,037,000	68,274,000	68,075,000
Stock-based compensation plans (shares)	0	860,000	0	1,052,000
Contingently issuable units (in shares)	0	0	0	122,000
Diluted weighted average common units outstanding (shares)	68,296,000	68,897,000	68,274,000	69,249,000
Common stock shares excluded from the diluted shares outstanding (shares)	1,402,771	621,134	1,380,364	517,574

Consolidated Statements of Operations (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Expenses
Operating expenses	$ 49,585	$ 45,011	$ 148,606	$ 127,151
Related Party
Expenses
Operating expenses	$ 2	$ 0	$ 3	$ 5,695

Stockholders' Equity of the Company - Share Repurchase Program (Details)	9 Months Ended	12 Months Ended			39 Months Ended
	Sep. 30, 2023 USD ($) shares	Dec. 31, 2022 $ / shares shares	Dec. 31, 2021 $ / shares shares	Dec. 31, 2020 USD ($) $ / shares shares	Dec. 31, 2020 USD ($) increase	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Jun. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)	Aug. 31, 2016 USD ($)
Class of Stock [Line Items]
Share repurchased (in shares) \| shares	0	1,971,092	4,474,649	8,276,032
Average price paid per share (in dollars per share) \| $ / shares		$ 76.69	$ 75.44	$ 64.30
2016 Repurchase Program
Class of Stock [Line Items]
Stock repurchase program, authorized amount \| $				$ 500,000,000	$ 500,000,000	$ 500,000,000	$ 500,000,000	$ 500,000,000	$ 500,000,000	$ 1,000,000,000
Number of increases to share repurchase program \| increase					5
Stock repurchase program, authorized amount \| $	$ 3,500,000,000
Share repurchased (in shares) \| shares		36,107,719	34,136,627	29,661,978

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 505
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Reference 2: http://www.xbrl.org/2003/role/recommendedDisclosureRef
-Topic 272
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
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-URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
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Reference 10: http://www.xbrl.org/2003/role/disclosureRef
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Reference 11: http://www.xbrl.org/2003/role/disclosureRef
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Reference 12: http://www.xbrl.org/2003/role/disclosureRef
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-Paragraph 1
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Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
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-Name Accounting Standards Codification
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-URI https://asc.fasb.org//1943274/2147481112/505-10-50-2

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
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Reference 15: http://www.xbrl.org/2003/role/disclosureRef
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Reference 18: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

- Definition

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

+ References + Details

Property Acquisitions	9 Months Ended
Property Acquisitions	Sep. 30, 2023
Business Combination and Asset Acquisition [Abstract]
Property Acquisitions	Property AcquisitionsDuring the nine months ended September 30, 2023, we did not acquire any properties from a third party.

Significant Accounting Policies - Concentrations of Credit Risk/Accounting Standards Updates (Details) - Annualized rent	3 Months Ended	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2023 tenant
Customer concentration
Concentration of Credit Risk
Number of tenants (tenants)		1
Maximum percentage of annualized rent for any one tenant not individually disclosed (percent) (more than)	5.00%	5.00%
Investment Property Concentration Risk \| One Vanderbilt Avenue
Concentration of Credit Risk
Percentage of concentration (percent)	15.60%
Investment Property Concentration Risk \| 11 Madison Avenue
Concentration of Credit Risk
Percentage of concentration (percent)	8.30%
Investment Property Concentration Risk \| 420 Lexington Ave
Concentration of Credit Risk
Percentage of concentration (percent)	6.80%
Investment Property Concentration Risk \| 1515 Broadway
Concentration of Credit Risk
Percentage of concentration (percent)	6.40%
Investment Property Concentration Risk \| 245 Park Avenue
Concentration of Credit Risk
Percentage of concentration (percent)	5.70%
Investment Property Concentration Risk \| 280 Park Avenue
Concentration of Credit Risk
Percentage of concentration (percent)	5.70%
Investment Property Concentration Risk \| 1185 Avenue of the Americas
Concentration of Credit Risk
Percentage of concentration (percent)	5.50%
Tenant 1 \| Customer concentration
Concentration of Credit Risk
Percentage of concentration (percent)		6.00%

Partners' Capital of the Operating Partnership (Tables)

9 Months Ended

Sep. 30, 2023

Equity [Abstract]

Schedule of calculation of numerator and denominator in earnings per unit

The Operating Partnership's earnings per unit for the three and nine months ended September 30, 2023 and 2022, respectively, are computed as follows (in thousands):


	Three Months Ended September 30,				Nine Months Ended September 30,
Numerator	2023		2022		2023		2022
Basic Earnings:
Net (loss) income attributable to SLGOP common unitholders (numerator for diluted earnings per unit)	$	(25,541)	$	7,868	$	(451,385)	$	(30,579)
Less: distributed earnings allocated to participating securities	(408)		(505)		(1,225)		(1,516)

Net (loss) income attributable to SLGOP common unitholders (numerator for basic earnings per unit)	$	(25,949)	$	7,363	$	(452,610)	$	(32,095)
Add back: dilutive effect of earnings allocated to participating securities and contingently issuable shares	—		505		—		(484)

Net (loss) income attributable to SLGOP common unitholders (numerator for diluted earnings per unit)	$	(25,949)	$	7,868	$	(452,610)	$	(32,579)


	Three Months Ended September 30,		Nine Months Ended September 30,
Denominator	2023	2022	2023	2022
Basic units:
Weighted average common units outstanding	68,296	68,037	68,274	68,075
Effect of Dilutive Securities:
Stock-based compensation plans	—	860	—	1,052
Contingently issuable units	—	—	—	122
Diluted weighted average common units outstanding	68,296	68,897	68,274	69,249

Debt and Preferred Equity Investments

9 Months Ended

Sep. 30, 2023

Investments, Debt and Equity Securities [Abstract]

Debt and Preferred Equity Investments

Below is a summary of the activity in our debt and preferred equity investments for the nine months ended September 30, 2023 and the twelve months ended December 31, 2022 (in thousands):


	September 30, 2023		December 31, 2022
Balance at beginning of year (1)	$	623,280	$	1,088,723
Debt investment originations/fundings/accretion (2)	61,845		62,992
Preferred equity investment originations/accretion (2)	6,039		37,505
Redemptions/sales/syndications/equity ownership/amortization	(349,947)		(565,940)
Net change in loan loss reserves	(6,890)		—
Balance at end of period (1)	$	334,327	$	623,280

(1)Net of unamortized fees, discounts, and premiums.

(2)Accretion includes amortization of fees and discounts and paid-in-kind investment income.

Below is a summary of our debt and preferred equity investments as of September 30, 2023 (dollars in thousands):


	Floating Rate					Fixed Rate					Total Carrying Value		Senior Financing		Weighted Average Yield at End of Period	Maturity (1)
Type	Carrying Value		Face Value		Interest Rate	Carrying Value		Face Value		Interest Rate


Mezzanine Debt	$	158,430	$	158,604	S + 4.95% - 13.25%	$	50,000	$	64,985	7.00% - 14.30%	$	208,430	$	1,069,704	9.15%	2023 - 2029
Preferred Equity	—		—		—	125,897		125,897		6.5%	125,897		250,000		6.55%	2027
Balance at end of period	$	158,430	$	158,604		$	175,897	$	190,882		$	334,327	$	1,319,704

(1)Excludes available extension options to the extent they have not been exercised as of the date of this filing.

The following table is a roll forward of our total allowance for loan losses for the nine months ended September 30, 2023 and the twelve months ended December 31, 2022 (in thousands):


	September 30, 2023		December 31, 2022
Balance at beginning of year	$	6,630	$	6,630



Current period provision for loan loss	6,890		—

Balance at end of period (1)	$	13,520	$	6,630

(1)As of September 30, 2023, all debt and preferred equity investments on non-accrual had an allowance for loan loss except for one debt investment with a carrying value of $50.0 million.

As of September 30, 2023, three investments with carrying values, net of reserves, totaling of $88.8 million were not performing in accordance with their respective terms. As of December 31, 2022, one investment with a carrying value, net of reserves, of $6.9 million was not performing in accordance with its respective terms. This is further discussed in the Debt Investments and Preferred Equity Investments tables below.

No other financing receivables were 90 days past due as of September 30, 2023 and December 31, 2022.

The following table sets forth the carrying value of our debt and preferred equity investment portfolio by risk rating as of September 30, 2023 and December 31, 2022 (dollars in thousands):


Risk Rating	September 30, 2023		December 31, 2022
1 - Low Risk Assets - Low probability of loss	$	207,156	$	264,069
2 - Watch List Assets - Higher potential for loss	127,171		352,321
3 - High Risk Assets - Loss more likely than not	—		6,890
	$	334,327	$	623,280

The following table sets forth the carrying value of our debt and preferred equity investment portfolio by year of origination and risk rating as of September 30, 2023 (dollars in thousands):


	As of September 30, 2023
Risk Rating	2023 (1)		2022 (1)		2021 (1)		Prior (1)(2)		Total
1 - Low Risk Assets - Low probability of loss	$	—	$	—	$	—	$	207,156	$	207,156
2 - Watch List Assets - Higher potential for loss	—		—		—		127,171		127,171
3 - High Risk Assets - Loss more likely than not	—		—		—		—		—
	$	—	$	—	$	—	$	334,327	$	334,327

(1)Year in which the investment was originated or acquired by us or in which a material modification occurred.

(2)During the nine months ended September 30, 2023, we recognized a $6.9 million provision for loan loss related to an investment originated prior to 2021.

We have determined that we have one portfolio segment of financing receivables as of September 30, 2023 and December 31, 2022 comprised of commercial real estate which is primarily recorded in debt and preferred equity investments.

Included in Other assets is an additional amount of financing receivables representing loans to joint venture partners totaling $9.1 million and $9.0 million as of September 30, 2023 and December 31, 2022, respectively. The Company recorded no provisions for loan losses related to these financing receivables for the three and nine months ended September 30, 2023 and 2022. All of these loans have a risk rating of 2 and were performing in accordance with their respective terms. One loan with a carrying value of $5.6 million was put on non-accrual in July 2020 and remains on non-accrual as of September 30, 2023. No investment income has been recognized subsequent to it being put on non-accrual.

Debt Investments

As of September 30, 2023 and December 31, 2022, we held the following debt investments with an aggregate weighted average current yield of 9.15% as of September 30, 2023 (dollars in thousands):


Loan Type	September 30, 2023 Future Funding Obligations		September 30, 2023 Senior Financing		September 30, 2023 Carrying Value (1)		December 31, 2022 Carrying Value (1)		Maturity Date (2)
Fixed Rate Investments:
Mezzanine Loan (3)(4)	$	—	$	105,000	$	13,366	$	13,366	June 2024
Mezzanine Loan	—		95,000		30,000		30,000		January 2025
Mezzanine Loan	—		85,000		20,000		20,000		December 2029
Mezzanine Loan (5)	—		—		—		225,367
Mezzanine Loan (5)	—		—		—		77,109
Total fixed rate	$	—	$	285,000	$	63,366	$	365,842
Floating Rate Investments:
Mezzanine Loan (6)	$	—	$	275,000	$	50,000	$	50,000	April 2023
Mezzanine Loan	3,761		54,000		8,243		8,243		November 2023
Mezzanine Loan	3,723		269,620		61,258		46,884		May 2024
Mezzanine Loan	—		186,084		39,083		39,083		January 2026
Total floating rate	$	7,484	$	784,704	$	158,584	$	144,210
Allowance for loan loss	$	—	$	—	$	(13,520)	$	(6,630)
Total	$	7,484	$	1,069,704	$	208,430	$	503,422

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

(2)Represents contractual maturity, excluding any extension options to the extent they have not been exercised as of the date of this filing.

(5)In September 2023, following a UCC foreclosure, the Company converted its previous mezzanine debt investments in the fee interest at 625 Madison Avenue to a 90.43% ownership interest.

Preferred Equity Investments


Type	September 30, 2023 Future Funding Obligations		September 30, 2023 Senior Financing		September 30, 2023 Carrying Value (1)		December 31, 2022 Carrying Value (1)		Mandatory Redemption (2)
Preferred Equity	$	—	$	250,000	$	125,897	$	119,858	February 2027

Allowance for loan loss	$	—	$	—	$	—	$	—
Total	$	—	$	250,000	$	125,897	$	119,858

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

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

Stockholders' Equity of the Company

9 Months Ended

Sep. 30, 2023

Stockholders' Equity Note [Abstract]

Stockholders' Equity of the Company

Stockholders’ Equity of the Company

Common Stock

Share Repurchase Program

As of September 30, 2023, share repurchases executed under the program, excluding the redemption of OP units, were as follows:


Period	Shares repurchased(1)	Average price paid per share	Cumulative number of shares repurchased as part of the repurchase plan or programs
Year ended 2020	8,276,032	$64.30	29,661,978
Year ended 2021	4,474,649	$75.44	34,136,627
Year ended 2022	1,971,092	$76.69	36,107,719

(1)There were no share repurchases during the nine months ended September 30, 2023.

Perpetual Preferred Stock

Dividend Reinvestment and Stock Purchase Plan ("DRSPP")


	Three Months Ended September 30,				Nine Months Ended September 30,
	2023		2022		2023		2022
Shares of common stock issued	2,695		2,933		14,736		5,827
Dividend reinvestments/stock purchases under the DRSPP	$	97	$	140	$	439	$	339

Earnings per Share

SL Green's earnings per share for the three and nine months ended September 30, 2023 and 2022 are computed as follows (in thousands):


	Three Months Ended September 30,				Nine Months Ended September 30,
Numerator	2023		2022		2023		2022
Basic Earnings:
(Loss) income attributable to SL Green common stockholders	$	(23,967)	$	7,377	$	(423,892)	$	(28,748)
Less: distributed earnings allocated to participating securities	(408)		(505)		(1,225)		(1,516)

Net (loss) income attributable to SL Green common stockholders (numerator for basic earnings per share)	$	(24,375)	$	6,872	$	(425,117)	$	(30,264)
Add back: dilutive effect of earnings allocated to participating securities and contingently issuable shares	—		505		—		(484)

Add back: effect of dilutive securities (redemption of units to common shares)	(1,574)		491		(27,493)		(1,831)
Net (loss) income attributable to SL Green common stockholders (numerator for diluted earnings per share)	$	(25,949)	$	7,868	$	(452,610)	$	(32,579)


	Three Months Ended September 30,		Nine Months Ended September 30,
Denominator	2023	2022	2023	2022
Basic Shares:
Weighted average common stock outstanding	64,114	63,949	64,099	63,971
Effect of Dilutive Securities:
Operating Partnership units redeemable for common shares	4,182	4,088	4,175	4,104
Stock-based compensation plans	—	860	—	1,052
Contingently issuable shares	—	—	—	122
Diluted weighted average common stock outstanding	68,296	68,897	68,274	69,249

Partners' Capital of the Operating Partnership

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 September 30, 2023, limited partners other than SL Green owned 6.04%, or 4,139,334 common units, of the Operating Partnership.

Preferred Units

Earnings per Unit

The Operating Partnership's earnings per unit for the three and nine months ended September 30, 2023 and 2022, respectively, are computed as follows (in thousands):


	Three Months Ended September 30,				Nine Months Ended September 30,
Numerator	2023		2022		2023		2022
Basic Earnings:
Net (loss) income attributable to SLGOP common unitholders (numerator for diluted earnings per unit)	$	(25,541)	$	7,868	$	(451,385)	$	(30,579)
Less: distributed earnings allocated to participating securities	(408)		(505)		(1,225)		(1,516)

Net (loss) income attributable to SLGOP common unitholders (numerator for basic earnings per unit)	$	(25,949)	$	7,363	$	(452,610)	$	(32,095)
Add back: dilutive effect of earnings allocated to participating securities and contingently issuable shares	—		505		—		(484)

Net (loss) income attributable to SLGOP common unitholders (numerator for diluted earnings per unit)	$	(25,949)	$	7,868	$	(452,610)	$	(32,579)


	Three Months Ended September 30,		Nine Months Ended September 30,
Denominator	2023	2022	2023	2022
Basic units:
Weighted average common units outstanding	68,296	68,037	68,274	68,075
Effect of Dilutive Securities:
Stock-based compensation plans	—	860	—	1,052
Contingently issuable units	—	—	—	122
Diluted weighted average common units outstanding	68,296	68,897	68,274	69,249

Accumulated Other Comprehensive Income

The following tables set forth the changes in accumulated other comprehensive income by component as of September 30, 2023 (in thousands):


	Net unrealized gain (loss) on derivative instruments (1)		SL Green’s share of joint venture net unrealized gain (loss) on derivative instruments (2)		Net unrealized loss on marketable securities		Total
Balance at December 31, 2022	$	47,800	$	2,046	$	(242)	$	49,604
Other comprehensive income before reclassifications	49,326		12,649		(1,525)		60,450
Amounts reclassified from accumulated other comprehensive income	(29,175)		(11,263)		—		(40,438)
Balance at September 30, 2023	$	67,951	$	3,432	$	(1,767)	$	69,616

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

- Definition

The entire disclosure for equity.

+ References

+ Details

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		9 Months Ended
	Feb. 28, 2023	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Schedule of Equity Method Investments [Line Items]
(Loss) Gain on Sale		$ 0	$ 0	$ (79)	$ (131)
121 Greene Street \| Joint venture \| Wharton Properties
Schedule of Equity Method Investments [Line Items]
Ownership Interest Disposed	50.00%
Sale Price	$ 14,000
(Loss) Gain on Sale	$ (300)

Significant Accounting Policies - Investments in Commercial Real Estate Properties (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Jun. 30, 2023	Dec. 31, 2022	Jul. 01, 2022	Jun. 30, 2022
Investment in Commercial Real Estate Properties
Rental revenue decrease from amortization of acquired leases	$ 100,000	$ 200,000	$ 14,300,000	$ 100,000
Identified intangible assets (included in other assets):
Gross amount	189,680,000		189,680,000			$ 403,552,000
Accumulated amortization	(184,491,000)		(184,491,000)			(190,066,000)
Net	5,189,000		5,189,000			213,486,000
Identified intangible liabilities (included in deferred revenue):
Gross amount	205,394,000		205,394,000			361,338,000
Accumulated amortization	(202,000,000)		(202,000,000)			(212,191,000)
Net	3,394,000		$ 3,394,000			$ 149,147,000
625 Madison Avenue
Investment in Commercial Real Estate Properties
Operating lease rent							$ 20,250,000	$ 4,610,000
Write down of value in leasehold interest	$ 305,900,000
Carrying value of investment in leasehold interest					$ 0
Minimum \| Above-market leases
Investment in Commercial Real Estate Properties
Estimated useful life of other intangible assets (in years)	1 year		1 year
Minimum \| Below-market leases
Investment in Commercial Real Estate Properties
Estimated useful life of other intangible assets (in years)	1 year		1 year
Minimum \| In-place leases
Investment in Commercial Real Estate Properties
Estimated useful life of other intangible assets (in years)	1 year		1 year
Maximum \| Above-market leases
Investment in Commercial Real Estate Properties
Estimated useful life of other intangible assets (in years)	15 years		15 years
Maximum \| Below-market leases
Investment in Commercial Real Estate Properties
Estimated useful life of other intangible assets (in years)	15 years		15 years
Maximum \| In-place leases
Investment in Commercial Real Estate Properties
Estimated useful life of other intangible assets (in years)	15 years		15 years
Building \| Minimum
Investment in Commercial Real Estate Properties
Estimated useful life (in years)	3 years		3 years
Building \| Maximum
Investment in Commercial Real Estate Properties
Estimated useful life (in years)	40 years		40 years

Stockholders' Equity of the Company - Additional Information (Details) - $ / shares	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021
Equity, Class of Treasury Stock [Line Items]
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
Excess shares issued (shares)	0
Excess shares outstanding (in shares)	0
Common Stock
Equity, Class of Treasury Stock [Line Items]
Shares, outstanding (in shares)	64,398,000	64,387,000	64,380,000	64,316,000	64,302,000	64,105,000
SL Green Operating Partnership \| Common Stock
Equity, Class of Treasury Stock [Line Items]
Shares, outstanding (in shares)	64,397,983
Shares, issued (in shares)	64,397,983

Organization and Basis of Presentation - Additional Information (Details) $ in Millions	9 Months Ended
	Sep. 30, 2023 USD ($) ft² building shares	Dec. 31, 2022
Organization
Number of buildings \| building	51
Unaudited Approximate Usable Square Feet \| ft²	29,708,910
Debt and preferred equity investments including investments held by unconsolidated joint ventures \| $	$ 334.3
Debt and preferred equity investments and other financing receivables included in other balance sheet items \| $	$ 8.3
Number of shares to be received on redemption of one unit of limited partnership interests (shares) \| shares	1
Managed office properties
Organization
Number of buildings \| building	1
Unaudited Approximate Usable Square Feet \| ft²	300,000
Service Corporation
Organization
Percentage of ownership in SL Green Management LLC owned by operating partnership (percent)	95.00%
Operating Partnership \| SL Green Operating Partnership
Organization
Noncontrolling interest in the operating partnership (as a percent)	6.04%	5.39%
SL Green Management \| SL Green Management LLC
Organization
Percentage of ownership in SL Green Management LLC owned by operating partnership (percent)	100.00%

Organization and Basis of Presentation

9 Months Ended

Sep. 30, 2023

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 S.L. Green Management Corp, or 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 and S.L. Green Management Corp., respectively, which are 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 September 30, 2023, noncontrolling investors held, in the aggregate, a 6.04% 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."


			Consolidated			Unconsolidated		Total
Location	Property Type		Number of Buildings		Approximate Square Feet (unaudited)	Number of Buildings	Approximate Square Feet (unaudited)	Number of Buildings	Approximate Square Feet (unaudited)	Weighted Average Leased Occupancy (1) (unaudited)
Commercial:
Manhattan	Office		13		8,399,141	12	15,412,174	25	23,811,315	89.3	%
	Retail		2		17,888	8	294,865	10	312,753	91.0	%
	Development/Redevelopment	(1)	4	(2)	1,466,419	3	2,893,357	7	4,359,776	N/A

			19		9,883,448	23	18,600,396	42	28,483,844	N/A
Suburban	Office		7		862,800	—	—	7	862,800	77.4	%



Total commercial properties			26		10,746,248	23	18,600,396	49	29,346,644	N/A
Residential:
Manhattan	Residential		1	(2)	140,382	1	221,884	2	362,266	99.0	%

Total portfolio			27		10,886,630	24	18,822,280	51	29,708,910	N/A

As of September 30, 2023, we also managed one office building owned by a third party encompassing approximately 0.3 million square feet (unaudited), and held debt and preferred equity investments with a book value of $334.3 million, excluding debt and preferred equity investments and other financing receivables totaling $8.3 million that are included in balance sheet line items other than the Debt and preferred equity investments line item.

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, subject to the priority distributions with respect to preferred units and special provisions that apply to Long Term Incentive Plan ("LTIP") Units. 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 September 30, 2023 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, 2023. 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, 2022 of the Company and the Operating Partnership.

The consolidated balance sheet at December 31, 2022 has been derived from the audited financial statements as of that date but does not include all the information and footnotes required by accounting principles generally accepted in the United States for complete financial statements.

Financial Instruments: Derivatives and Hedging (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Financial Instruments: Derivatives and Hedging
Fair Value	$ 77,921,000		$ 77,921,000		$ 57,660,000
Changes in fair value		$ 1,300,000		$ 1,300,000
Fair value of derivatives in a net liability position	6,600,000		6,600,000
Aggregate termination value	6,600,000		6,600,000
Estimated current balance held in accumulated other comprehensive loss to be reclassified into earnings within the next 12 months			46,800,000
Share of joint venture of accumulated other comprehensive loss reclassified into equity in net income from unconsolidated joint ventures within the next 12 months			13,800,000
Amount of Gain Recognized in Other Comprehensive (Loss) Income	28,837,000	53,411,000	66,091,000	106,719,000
Amount of Gain Reclassified from Accumulated Other Comprehensive Income into Income	16,038,000	2,923,000	43,029,000	(4,659,000)
Purchase Price Fair Value Adjustment Gross
Financial Instruments: Derivatives and Hedging
Gain (loss) from changes in fair value	0		200,000
Interest Expense
Financial Instruments: Derivatives and Hedging
Gain (loss) from changes in fair value	0	0	200,000	0
Interest Rate Contract
Financial Instruments: Derivatives and Hedging
Fair Value	71,953,000		71,953,000
Interest Rate Swap Expiring in November 2023
Financial Instruments: Derivatives and Hedging
Notional Value	$ 200,000,000		$ 200,000,000
Strike Rate	4.739%		4.739%
Fair Value	$ 149,000		$ 149,000
Interest Rate Cap Expiring November 2023
Financial Instruments: Derivatives and Hedging
Notional Value	$ 196,717,000		$ 196,717,000
Strike Rate	3.50%		3.50%
Fair Value	$ 449,000		$ 449,000
Interest Rate Cap Expiring November 2023, 2
Financial Instruments: Derivatives and Hedging
Notional Value	$ 196,717,000		$ 196,717,000
Strike Rate	3.50%		3.50%
Fair Value	$ (449,000)		$ (449,000)
Interest Rate Swap Expiring January 2024
Financial Instruments: Derivatives and Hedging
Notional Value	$ 150,000,000		$ 150,000,000
Strike Rate	2.60%		2.60%
Fair Value	$ 1,061,000		$ 1,061,000
Interest Rate Swap Expiring in January 2024, 2
Financial Instruments: Derivatives and Hedging
Notional Value	$ 200,000,000		$ 200,000,000
Strike Rate	4.49%		4.49%
Fair Value	$ 447,000		$ 447,000
Interest Rate Swap Expiring in January 2024, 3
Financial Instruments: Derivatives and Hedging
Notional Value	$ 200,000,000		$ 200,000,000
Strike Rate	4.411%		4.411%
Fair Value	$ 488,000		$ 488,000
Interest Rate Cap Expiring June 2023
Financial Instruments: Derivatives and Hedging
Notional Value	$ 370,000,000		$ 370,000,000
Strike Rate	3.25%		3.25%
Fair Value	$ 5,526,000		$ 5,526,000
Mezzanine Loan Due June 2023, 2
Financial Instruments: Derivatives and Hedging
Notional Value	$ 370,000,000		$ 370,000,000
Strike Rate	3.25%		3.25%
Fair Value	$ (5,519,000)		$ (5,519,000)
Interest Rate Swap Expiring January 2026
Financial Instruments: Derivatives and Hedging
Notional Value	$ 150,000,000		$ 150,000,000
Strike Rate	2.621%		2.621%
Fair Value	$ 6,885,000		$ 6,885,000
Interest Rate Swap Expiring January 2026, 2
Financial Instruments: Derivatives and Hedging
Notional Value	$ 200,000,000		$ 200,000,000
Strike Rate	2.662%		2.662%
Fair Value	$ 9,035,000		$ 9,035,000
Interest Rate Swap Expiring in February 2027
Financial Instruments: Derivatives and Hedging
Notional Value	$ 100,000,000		$ 100,000,000
Strike Rate	2.903%		2.903%
Fair Value	$ 4,896,000		$ 4,896,000
Interest Rate Swap Expiring in February 2027, 2
Financial Instruments: Derivatives and Hedging
Notional Value	$ 100,000,000		$ 100,000,000
Strike Rate	2.733%		2.733%
Fair Value	$ 5,422,000		$ 5,422,000
Interest Rate Swap Expiring in February 2027, 3
Financial Instruments: Derivatives and Hedging
Notional Value	$ 50,000,000		$ 50,000,000
Strike Rate	2.463%		2.463%
Fair Value	$ 3,130,000		$ 3,130,000
Interest Rate Swap Expiring in February 2027, 4
Financial Instruments: Derivatives and Hedging
Notional Value	$ 200,000,000		$ 200,000,000
Strike Rate	2.591%		2.591%
Fair Value	$ 11,727,000		$ 11,727,000
Interest Rate Swap Expiring in May 2027
Financial Instruments: Derivatives and Hedging
Notional Value	$ 300,000,000		$ 300,000,000
Strike Rate	2.866%		2.866%
Fair Value	$ 15,663,000		$ 15,663,000
Interest Rate Swap Expiring in May 2027, 2
Financial Instruments: Derivatives and Hedging
Notional Value	$ 150,000,000		$ 150,000,000
Strike Rate	3.524%		3.524%
Fair Value	$ 3,850,000		$ 3,850,000
Interest Rate Swap Expiring in June 2027
Financial Instruments: Derivatives and Hedging
Notional Value	$ 370,000,000		$ 370,000,000
Strike Rate	3.888%		3.888%
Fair Value	$ 6,757,000		$ 6,757,000
Interest Rate Swap Expiring in January 2028
Financial Instruments: Derivatives and Hedging
Notional Value	$ 100,000,000		$ 100,000,000
Strike Rate	3.756%		3.756%
Fair Value	$ 2,436,000		$ 2,436,000
Interest Rate Swaps/Caps
Financial Instruments: Derivatives and Hedging
Amount of Gain Recognized in Other Comprehensive (Loss) Income	24,910,000	44,057,000	52,624,000	83,768,000
Amount of Gain Reclassified from Accumulated Other Comprehensive Income into Income	11,422,000	3,061,000	31,043,000	(2,673,000)
Joint venture
Financial Instruments: Derivatives and Hedging
Amount of Gain Recognized in Other Comprehensive (Loss) Income	3,927,000	9,354,000	13,467,000	22,951,000
Amount of Gain Reclassified from Accumulated Other Comprehensive Income into Income	4,616,000	$ (138,000)	11,986,000	$ (1,986,000)
Joint venture \| Interest Rate Contract
Financial Instruments: Derivatives and Hedging
Fair Value	74,912,000		74,912,000
Joint venture \| Interest Rate Cap Expiring February 2024
Financial Instruments: Derivatives and Hedging
Notional Value	$ 220,000,000		$ 220,000,000
Strike Rate	4.00%		4.00%
Fair Value	$ 1,097,000		$ 1,097,000
Joint venture \| Interest Rate Cap Expiring May 2024
Financial Instruments: Derivatives and Hedging
Notional Value	$ 410,070,000		$ 410,070,000
Strike Rate	0.49%		0.49%
Fair Value	$ 14,040,000		$ 14,040,000
Joint venture \| Interest Rate Cap Expiring May 2024, 2
Financial Instruments: Derivatives and Hedging
Notional Value	$ 410,070,000		$ 410,070,000
Strike Rate	0.49%		0.49%
Fair Value	$ 14,035,000		$ 14,035,000
Joint venture \| Interest Rate Cap Expiring June 2024
Financial Instruments: Derivatives and Hedging
Notional Value	$ 505,412,000		$ 505,412,000
Strike Rate	3.00%		3.00%
Fair Value	$ 8,524,000		$ 8,524,000
Joint venture \| Interest Rate Cap Expiring August 2024
Financial Instruments: Derivatives and Hedging
Notional Value	$ 272,000,000		$ 272,000,000
Strike Rate	4.00%		4.00%
Fair Value	$ 3,176,000		$ 3,176,000
Joint venture \| Interest Rate Cap Expiring September 2024
Financial Instruments: Derivatives and Hedging
Notional Value	$ 434,816,000		$ 434,816,000
Strike Rate	3.50%		3.50%
Fair Value	$ 8,781,000		$ 8,781,000
Joint venture \| Interest Rate Swap Expiring February 2026
Financial Instruments: Derivatives and Hedging
Notional Value	$ 250,000,000		$ 250,000,000
Strike Rate	3.608%		3.608%
Fair Value	$ 6,305,000		$ 6,305,000
Joint venture \| Interest Rate Swap Expiring February 2026, 2
Financial Instruments: Derivatives and Hedging
Notional Value	$ 250,000,000		$ 250,000,000
Strike Rate	3.608%		3.608%
Fair Value	$ 6,299,000		$ 6,299,000
Joint venture \| Interest Rate Swap Expiring February 2026, 3
Financial Instruments: Derivatives and Hedging
Notional Value	$ 177,000,000		$ 177,000,000
Strike Rate	1.555%		1.555%
Fair Value	$ 12,655,000		$ 12,655,000

Investments in Unconsolidated Joint Ventures - Information about Joint Ventures (Details) $ in Thousands	1 Months Ended	3 Months Ended	9 Months Ended	12 Months Ended
	Jun. 30, 2023 USD ($)	Sep. 30, 2023 USD ($) ft² unit	Sep. 30, 2023 USD ($) ft² unit	Dec. 31, 2020 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021
General information on each joint venture
Company's investments in unconsolidated joint ventures \| $		$ 3,152,752	$ 3,152,752		$ 3,190,137
Net equity investment in VIEs in which the entity is not primary beneficiary \| $		$ 453,700	$ 453,700		86,200
Unaudited Approximate Square Feet (sqft)		29,708,910	29,708,910
Ownership percentage deconsolidated	50.10%
Investment fair value adjustment \| $	$ 17,000	$ 17,000	$ 17,000
Total fixed rate debt \| $		1,398,724	1,398,724		3,115,814
245 Park Avenue
General information on each joint venture
Total fixed rate debt \| $		$ 0	$ 0		1,712,750
National Pension Service of Korea / Hines Interest LP / International Investor \| One Madison Avenue
General information on each joint venture
Ownership percentage deconsolidated				50.50%
Investment fair value adjustment \| $				$ 187,500
Investment in joint venture aggregate maximum ownership percentage						25.00%
Third-Party \| Korean Institutional Investor / Israeli Institutional Investor \| 450 Park Avenue
General information on each joint venture
Ownership Interest		49.90%	49.90%
Investment in joint venture, partners' ownership percentage		25.00%	25.00%
Three Retail and Two Residential Units \| Private Investors \| 21 East 66th Street
General information on each joint venture
Ownership Interest		32.28%	32.28%
Number of stores \| unit		3	3
Number of residential units \| unit		1	1
Three Residential Units \| Private Investors \| 21 East 66th Street
General information on each joint venture
Ownership Interest		16.14%	16.14%
Number of residential units \| unit		2	2
Joint venture
General information on each joint venture
Company's investments in unconsolidated joint ventures \| $		$ 3,152,752	$ 3,152,752
Equity method investments with negative book value \| $		129,100	129,100
Total fixed rate debt \| $		$ 11,911,148	$ 11,911,148		10,855,657
Joint venture \| Prudential Real Estate Investors \| 100 Park Avenue
General information on each joint venture
Ownership Interest		49.90%	49.90%
Economic Interest		49.90%	49.90%
Unaudited Approximate Square Feet (sqft)		834,000	834,000
Joint venture \| Wharton Properties / Private Investor \| 717 Fifth Avenue
General information on each joint venture
Ownership Interest		10.92%	10.92%
Economic Interest		10.92%	10.92%
Unaudited Approximate Square Feet (sqft)		119,500	119,500
Interest rate, fixed rate debt (as a percent)		5.02%	5.02%
Total fixed rate debt \| $		$ 655,328	$ 655,328		655,328
Joint venture \| Private Investors \| 800 Third Avenue
General information on each joint venture
Ownership Interest		60.52%	60.52%
Economic Interest		60.52%	60.52%
Unaudited Approximate Square Feet (sqft)		526,000	526,000
Interest rate, fixed rate debt (as a percent)		3.37%	3.37%
Total fixed rate debt \| $		$ 177,000	$ 177,000		177,000
Joint venture \| Private Investors \| 21 East 66th Street
General information on each joint venture
Ownership Interest		32.28%	32.28%
Economic Interest		32.28%	32.28%
Unaudited Approximate Square Feet (sqft)		13,069	13,069
Joint venture \| Private Investors \| 115 Spring Street
General information on each joint venture
Ownership Interest		51.00%	51.00%
Economic Interest		51.00%	51.00%
Unaudited Approximate Square Feet (sqft)		5,218	5,218
Interest rate, fixed rate debt (as a percent)		5.50%	5.50%
Total fixed rate debt \| $		$ 65,550	$ 65,550		0
Joint venture \| New York State Teacher's Retirement System \| 919 Third Avenue
General information on each joint venture
Ownership Interest		51.00%	51.00%
Economic Interest		51.00%	51.00%
Unaudited Approximate Square Feet (sqft)		1,454,000	1,454,000
Interest rate, fixed rate debt (as a percent)		6.11%	6.11%
Joint venture \| Private Investor / Wharton Properties \| 11 West 34th Street
General information on each joint venture
Ownership Interest		30.00%	30.00%
Economic Interest		30.00%	30.00%
Unaudited Approximate Square Feet (sqft)		17,150	17,150
Joint venture \| Vornado Realty Trust \| 280 Park Avenue
General information on each joint venture
Ownership Interest		50.00%	50.00%
Economic Interest		50.00%	50.00%
Unaudited Approximate Square Feet (sqft)		1,219,158	1,219,158
Total fixed rate debt \| $					1,200,000
Joint venture \| Wharton Properties \| 1552-1560 Broadway
General information on each joint venture
Ownership Interest		50.00%	50.00%
Economic Interest		50.00%	50.00%
Unaudited Approximate Square Feet (sqft)		57,718	57,718
Joint venture \| Wharton Properties \| 650 Fifth Avenue
General information on each joint venture
Ownership Interest		50.00%	50.00%
Economic Interest		50.00%	50.00%
Unaudited Approximate Square Feet (sqft)		69,214	69,214
Interest rate, fixed rate debt (as a percent)		5.45%	5.45%
Total fixed rate debt \| $		$ 65,000	$ 65,000		65,000
Joint venture \| Canadian Pension Plan Investment Board \| 10 East 53rd Street
General information on each joint venture
Ownership Interest		55.00%	55.00%
Economic Interest		55.00%	55.00%
Unaudited Approximate Square Feet (sqft)		354,300	354,300
Interest rate, fixed rate debt (as a percent)		5.45%	5.45%
Total fixed rate debt \| $		$ 220,000	$ 220,000		220,000
Joint venture \| PGIM Real Estate \| 11 Madison Avenue
General information on each joint venture
Ownership Interest		60.00%	60.00%
Economic Interest		60.00%	60.00%
Unaudited Approximate Square Feet (sqft)		2,314,000	2,314,000
Interest rate, fixed rate debt (as a percent)		3.84%	3.84%
Total fixed rate debt \| $		$ 1,400,000	$ 1,400,000		1,400,000
Joint venture \| National Pension Service of Korea / Hines Interest LP \| One Vanderbilt Avenue
General information on each joint venture
Ownership Interest		71.01%	71.01%
Economic Interest		71.01%	71.01%
Unaudited Approximate Square Feet (sqft)		1,657,198	1,657,198
Interest rate, fixed rate debt (as a percent)		2.95%	2.95%
Total fixed rate debt \| $		$ 3,000,000	$ 3,000,000		3,000,000
Joint venture \| RXR Realty / New York REIT \| Worldwide Plaza
General information on each joint venture
Ownership Interest		24.95%	24.95%
Economic Interest		24.95%	24.95%
Unaudited Approximate Square Feet (sqft)		2,048,725	2,048,725
Interest rate, fixed rate debt (as a percent)		3.98%	3.98%
Total fixed rate debt \| $		$ 1,200,000	$ 1,200,000		1,200,000
Joint venture \| Allianz Real Estate of America \| 1515 Broadway
General information on each joint venture
Ownership Interest		56.87%	56.87%
Economic Interest		56.87%	56.87%
Unaudited Approximate Square Feet (sqft)		1,750,000	1,750,000
Interest rate, fixed rate debt (as a percent)		3.93%	3.93%
Total fixed rate debt \| $		$ 767,179	$ 767,179		782,321
Joint venture \| Israeli Institutional Investor \| 2 Herald Square
General information on each joint venture
Ownership Interest		51.00%	51.00%
Economic Interest		51.00%	51.00%
Unaudited Approximate Square Feet (sqft)		369,000	369,000
Joint venture \| A Fund Managed By Meritz Alternative Investment Management \| 15 Beekman
General information on each joint venture
Ownership Interest		20.00%	20.00%
Economic Interest		20.00%	20.00%
Unaudited Approximate Square Feet (sqft)		221,884	221,884
Joint venture \| A Fund Managed By Meritz Alternative Investment Management \| 220 East 42nd Street
General information on each joint venture
Ownership Interest		51.00%	51.00%
Economic Interest		51.00%	51.00%
Unaudited Approximate Square Feet (sqft)		1,135,000	1,135,000
Interest rate, fixed rate debt (as a percent)		5.86%	5.86%
Total fixed rate debt \| $		$ 505,412	$ 505,412		510,000
Joint venture \| Wells Fargo \| 85 Fifth Avenue
General information on each joint venture
Ownership Interest		36.27%	36.27%
Economic Interest		36.27%	36.27%
Unaudited Approximate Square Feet (sqft)		12,946	12,946
Joint venture \| National Pension Service of Korea / Hines Interest LP / International Investor \| One Madison Avenue
General information on each joint venture
Ownership Interest		25.50%	25.50%
Economic Interest		25.50%	25.50%
Unaudited Approximate Square Feet (sqft)		1,048,700	1,048,700
Interest rate, fixed rate debt (as a percent)		3.59%	3.59%
Total fixed rate debt \| $		$ 662,663	$ 662,663		467,008
Joint venture \| Korean Institutional Investor / Israeli Institutional Investor \| 450 Park Avenue
General information on each joint venture
Ownership Interest		50.10%	50.10%
Economic Interest		25.10%	25.10%
Unaudited Approximate Square Feet (sqft)		337,000	337,000
Investment in joint venture, ownership percentage		25.10%	25.10%
Interest rate, fixed rate debt (as a percent)		6.10%	6.10%
Total fixed rate debt \| $		$ 267,000	$ 267,000		267,000
Joint venture \| RXR Realty Led Investment Group \| 5 Times Square
General information on each joint venture
Ownership Interest		31.55%	31.55%
Economic Interest		31.55%	31.55%
Unaudited Approximate Square Feet (sqft)		1,131,735	1,131,735
Interest rate, fixed rate debt (as a percent)		7.07%	7.07%
Total fixed rate debt \| $		$ 434,816	$ 434,816		400,000
Joint venture \| Mori Trust Co., Ltd \| 245 Park Avenue
General information on each joint venture
Ownership Interest		50.10%	50.10%
Economic Interest		50.10%	50.10%
Unaudited Approximate Square Feet (sqft)		1,782,793	1,782,793
Interest rate, fixed rate debt (as a percent)		4.30%	4.30%
Total fixed rate debt \| $		$ 1,768,000	$ 1,768,000		$ 0
Joint venture \| A Fund Affiliated With Winthrop Capital Partners \| 625 Madison Avenue
General information on each joint venture
Ownership Interest		90.43%	90.43%
Economic Interest		90.43%	90.43%
Unaudited Approximate Square Feet (sqft)		563,000	563,000

Mortgages and Other Loans Payable (Details) - USD ($)	Sep. 30, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Total fixed rate debt	$ 1,398,724,000	$ 3,115,814,000
Total floating rate debt	120,148,000	120,148,000
Total mortgages and other loans payable	1,518,872,000	3,235,962,000
Deferred financing costs, net of amortization	(6,126,000)	(8,399,000)
Total mortgages and other loans payable, net	1,512,746,000	3,227,563,000
Book value of collateral	1,900,000,000	3,800,000,000
7 Dey / 185 Broadway
Debt Instrument [Line Items]
Total fixed rate debt	200,000,000	200,000,000
Total floating rate debt	10,148,000	10,148,000
420 Lexington Ave
Debt Instrument [Line Items]
Total fixed rate debt	278,724,000	283,064,000
100 Church Street
Debt Instrument [Line Items]
Total fixed rate debt	370,000,000	370,000,000
Landmark Square
Debt Instrument [Line Items]
Total fixed rate debt	100,000,000	100,000,000
485 Lexington Avenue
Debt Instrument [Line Items]
Total fixed rate debt	450,000,000	450,000,000
245 Park Avenue
Debt Instrument [Line Items]
Total fixed rate debt	0	1,712,750,000
690 Madison Avenue
Debt Instrument [Line Items]
Total floating rate debt	60,000,000	60,000,000
719 Seventh Avenue
Debt Instrument [Line Items]
Total floating rate debt	$ 50,000,000	$ 50,000,000
Weighted Average \| 7 Dey / 185 Broadway
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	7.59%
Interest rate, floating rate debt (as a percent)	2.85%
Weighted Average \| 420 Lexington Ave
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	3.99%
Weighted Average \| 100 Church Street
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	5.89%
Weighted Average \| Landmark Square
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	4.90%
Weighted Average \| 485 Lexington Avenue
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	4.25%
Weighted Average \| 690 Madison Avenue
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)	0.50%
Weighted Average \| 719 Seventh Avenue
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)	1.31%
Construction Loans \| 7 Dey / 185 Broadway
Debt Instrument [Line Items]
Maximum facility capacity	$ 225,000,000

Investments in Unconsolidated Joint Ventures - Schedules of Combined Financial Statements for the Unconsolidated Joint Ventures (Details) - USD ($)
$ in Thousands

3 Months Ended

9 Months Ended

Sep. 30, 2023

Sep. 30, 2022

Sep. 30, 2023

Sep. 30, 2022

Jun. 30, 2023

Dec. 31, 2022

Jun. 30, 2022

Dec. 31, 2021

Investment in Unconsolidated Joint Ventures

Management fees, base revenue

$ 173,220

$ 212,456

$ 617,865

$ 601,865

Assets

Commercial real estate property, net

4,994,297

$ 7,159,245

Cash and restricted cash

189,750

201,267

189,750

201,267

203,273

Tenant and other receivables, related party receivables, and deferred rents receivable

37,295

34,497

Other assets

472,071

546,945

Total assets

^[1]

9,690,582

12,355,794

Liabilities and equity

Mortgages and other loans payable, net

1,512,746

3,227,563

Lease liability - operating leases

887,412

895,100

Other liabilities

453,349

236,211

Equity

4,107,243

4,752,221

4,107,243

4,752,221

$ 4,159,833

4,646,922

$ 4,748,764

$ 4,778,253

Total liabilities and equity/capital

9,690,582

12,355,794

Company's investments in unconsolidated joint ventures

3,152,752

3,190,137

Investments difference between carrying amount and underlying equity

537,400

Combined statements of income for the unconsolidated joint ventures

Total revenues

173,220

212,456

617,865

601,865

Operating expenses

49,585

45,011

148,606

127,151

Real estate taxes

31,195

35,111

112,463

96,677

Operating lease rent

7,253

7,388

20,209

20,429

Interest expense, net of interest income

27,440

21,824

109,714

51,854

Amortization of deferred financing costs

2,152

2,043

6,327

5,908

Depreciation and amortization

50,212

48,462

197,844

142,359

Total expenses

190,876

181,407

672,268

514,273

Net (loss) income

(21,694)

12,211

(439,279)

(12,253)

Company's equity in net loss from unconsolidated joint ventures

(15,126)

(21,997)

(44,470)

(31,262)

Joint venture

Investment in Unconsolidated Joint Ventures

Management fees, base revenue

407,148

330,705

1,140,889

997,670

Assets

Commercial real estate property, net

18,667,334

15,989,642

Cash and restricted cash

691,274

709,299

Tenant and other receivables, related party receivables, and deferred rents receivable

668,137

601,552

Other assets

2,656,613

2,551,426

Total assets

22,683,358

19,851,919

Liabilities and equity

Mortgages and other loans payable, net

14,707,926

12,348,954

Deferred revenue

1,156,816

1,077,901

Lease liability - operating leases

993,041

1,000,356

Other liabilities

444,208

456,537

Equity

5,381,367

4,968,171

Total liabilities and equity/capital

22,683,358

$ 19,851,919

Company's investments in unconsolidated joint ventures

3,152,752

Combined statements of income for the unconsolidated joint ventures

Total revenues

407,148

330,705

1,140,889

997,670

Operating expenses

63,081

59,841

183,825

173,327

Real estate taxes

78,564

66,594

210,428

186,710

Operating lease rent

7,307

6,616

21,746

19,465

Interest expense, net of interest income

162,897

112,747

421,528

305,977

Amortization of deferred financing costs

6,897

7,116

21,140

20,568

Depreciation and amortization

138,199

116,511

380,867

343,183

Total expenses

456,945

369,425

1,239,534

1,049,230

Loss on early extinguishment of debt

(467)

Net (loss) income

(49,797)

(38,720)

(98,645)

(52,027)

Company's equity in net loss from unconsolidated joint ventures

(15,126)

(21,997)

(44,470)

(31,262)

Management Service, Base | Joint venture

Investment in Unconsolidated Joint Ventures

Management fees, base revenue

3,500

5,800

16,300

15,000

Combined statements of income for the unconsolidated joint ventures

Total revenues

$ 3,500

$ 5,800

$ 16,300

$ 15,000

[1]

Related Party Transactions

9 Months Ended

Sep. 30, 2023

Related Party Transactions

Cleaning/ Security/ Messenger and Restoration Services

Prior to 2023, Alliance Building Services, or Alliance, and its affiliates, which provide services to certain properties owned by us, were previously partially owned by Gary Green, a son of Stephen L. Green, who serves as a member and as the chairman emeritus of our Board of Directors. 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 the profit participation while Alliance was partially owned by Gary Green prior to 2023, which is included in Other income on the consolidated statements of operations, was $0.0 million and $1.4 million for the three and nine months ended September 30, 2022, respectively. We also recorded expenses, inclusive of capitalized expenses, of $0.0 million and $8.6 million for these services (excluding services provided directly to tenants) for the three and nine months ended September 30, 2022, respectively.

One Vanderbilt Avenue Investment

In December 2016, we entered into agreements with entities owned and controlled by our Chairman and CEO, Marc Holliday, and our President, Andrew Mathias, pursuant to which they agreed to make an investment in our One Vanderbilt project (inclusive of the property and Summit One Vanderbilt) at the appraised fair market value for the interests acquired. This investment entitles these entities to receive approximately 1.50% - 1.80% and 1.00% - 1.20%, respectively, of any profits realized by the Company from its One Vanderbilt project in excess of the Company’s capital contributions. The entities have no right to any return of capital. Accordingly, subject to previously disclosed repurchase rights, these interests will have no value and will not entitle these entities to any amounts (other than limited distributions to cover tax liabilities incurred) unless and until the Company has received distributions from the One Vanderbilt project in excess of the Company’s aggregate investment in the project. In the event that the Company does not realize a profit on its investment in the project (or would not realize a profit based on the value at the time the interests are repurchased), the entities owned and controlled by Messrs. Holliday and Mathias will lose the entire amount of their investment. The entities owned and controlled by Messrs. Holliday and Mathias paid $1.4 million and $1.0 million, respectively, which equaled the fair market value of the interests acquired as of the date the investment agreements were entered into as determined by an independent third party appraisal that we obtained.

Messrs. Holliday and Mathias have the right to tender their interests in the project upon stabilization (50% within three years after stabilization and 100% three years or more after stabilization). In addition, the agreement calls for us to repurchase these interests in the event of a sale of One Vanderbilt or a transactional change of control of the Company. We also have the right to repurchase these interests on the 7-year anniversary of the stabilization of the project or upon the occurrence of certain separation events prior to the stabilization of the project relating to each of Messrs. Holliday’s and Mathias’s continued service with us. The price paid upon a tender of the interests will equal the liquidation value of the interests at the time, with the value being based on the project's sale price, if applicable, or fair market value as determined by an independent third party appraiser. In 2022, stabilization of the property (but not Summit One Vanderbilt) was achieved. Therefore, Messrs. Holiday and Mathias exercised their rights to tender 50% of their interests in the property (but not Summit One Vanderbilt) for liquidation values of $17.9 million and $11.9 million, respectively, which were paid in July 2022.

One Vanderbilt Avenue Leases

In November 2018, we entered into a lease agreement with the One Vanderbilt Avenue joint venture covering certain floors at the property. In March 2021, the lease commenced and we relocated our corporate headquarters to the leased space. For the three and nine months ended September 30, 2023, we recorded $0.7 million and $2.2 million, respectively, of rent expense under the lease. For the three and nine months ended September 30, 2022, we recorded $0.7 million and $2.2 million, respectively, of rent expense under the lease. Additionally, in June 2021, through a wholly-owned subsidiary, we entered into a lease agreement with the One Vanderbilt Avenue joint venture for Summit One Vanderbilt, which commenced in October 2021. For the three and nine months ended September 30, 2023 we recorded $17.0 million and $31.1 million, respectively, of rent expense under the lease, including percentage rent, of which $11.7 million and $21.0 million, respectively, was recognized as income as a component of Equity in net loss from unconsolidated joint ventures in our consolidated statements of operations. For the three and nine months ended September 30, 2022, we recorded $8.3 million and $26.0 million, respectively, of rent expense under the lease, including percentage rent, of which $5.5 million and $17.4 million, respectively, was recognized as income in Equity in net loss from unconsolidated joint ventures in our consolidated statements of operations.

Other

We are entitled to receive fees for providing management, leasing, construction supervision and asset management services to certain of our joint ventures as further described in Note 6, "Investments in Unconsolidated Joint Ventures." Amounts due from joint ventures and related parties as of September 30, 2023 and December 31, 2022 consisted of the following (in thousands):


	September 30, 2023		December 31, 2022
Due from joint ventures	$	8,219	$	26,812
Other	1,504		540
Related party receivables	$	9,723	$	27,352

- Definition

The entire disclosure for related party transactions. Examples of related party transactions include transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners; and (d) affiliates.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480990/946-20-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480990/946-20-50-5

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480990/946-20-50-6

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 235
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481062/946-235-50-2

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 235
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481062/946-235-50-2

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 850
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483326/850-10-50-1

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(2)(g)(3))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483575/946-220-S99-1

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(2)(c))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483575/946-220-S99-1

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(2)(e))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483575/946-220-S99-1

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 850
-Name Accounting Standards Codification
-Publisher FASB
-URI https://asc.fasb.org//850/tableOfContent

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 850
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483326/850-10-50-6

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 850
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483326/850-10-50-1

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 850
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483326/850-10-50-1

+ Details

Mortgages and Other Loans Payable (Tables)

9 Months Ended

Sep. 30, 2023

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	Final Maturity Date (1)	Interest Rate (2)		September 30, 2023		December 31, 2022
Fixed Rate Debt:

7 Dey / 185 Broadway (3)	November 2023	November 2023		7.59%	$	200,000	$	200,000
420 Lexington Avenue	October 2024	October 2040		3.99%	278,724		283,064
100 Church Street	June 2025	June 2027		5.89%	370,000		370,000
Landmark Square	January 2027	January 2027		4.90%	100,000		100,000
485 Lexington Avenue	February 2027	February 2027		4.25%	450,000		450,000
245 Park Avenue					—		1,712,750
Total fixed rate debt					$	1,398,724	$	3,115,814
Floating Rate Debt:
7 Dey / 185 Broadway (3)	November 2023	November 2023	S+	2.85%	$	10,148	$	10,148
690 Madison Avenue	July 2024	July 2025	S+	0.50%	60,000		60,000
719 Seventh Avenue	December 2024	December 2024	S+	1.31%	50,000		50,000
Total floating rate debt					$	120,148	$	120,148


Total mortgages and other loans payable					$	1,518,872	$	3,235,962
Deferred financing costs, net of amortization					(6,126)		(8,399)
Total mortgages and other loans payable, net					$	1,512,746	$	3,227,563

(1)Reflects exercise of all available options. The ability to exercise extension options may be subject to certain tests based on the operating performance of the property.

Noncontrolling Interests on the Company's Consolidated Financial Statements

9 Months Ended

Sep. 30, 2023

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 the 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 September 30, 2023 and December 31, 2022, the noncontrolling interest unit holders owned 6.04%, or 4,139,334 units, and 5.39%, or 3,670,343 units, of the Operating Partnership, respectively. As of September 30, 2023, 4,139,334 shares of our 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 our common stock at the end of the reporting period.


	September 30, 2023		December 31, 2022
Balance at beginning of period	$	269,993	$	344,252
Distributions	(11,225)		(16,272)
Issuance of common units	16,350		22,855
Redemption and conversion of common units	(8,900)		(40,901)
Net loss	(27,493)		(5,794)
Accumulated other comprehensive (loss) income allocation	1,425		5,827
Fair value adjustment	8,072		(39,974)
Balance at end of period	$	248,222	$	269,993

Preferred Units of Limited Partnership Interest in the Operating Partnership

Below is a summary of the preferred units of limited partnership interest in the Operating Partnership as of September 30, 2023:


Issuance	Stated Distribution Rate		Number of Units Authorized	Number of Units Issued	Number of Units Outstanding	Annual Dividend Per Unit(1)		Liquidation Preference Per Unit(2)		Conversion Price Per Unit(3)		Date of Issuance
Series A (4)	5.00	%	109,161	109,161	109,161	$	50.0000	$	1,000.00	$	—	August 2015
Series F	7.00	%	60	60	60	70.0000		1,000.00		29.12		January 2007
Series K	3.50	%	700,000	563,954	341,677	0.8750		25.00		134.67		August 2014
Series L	4.00	%	500,000	378,634	372,634	1.0000		25.00		—		August 2014
Series R	3.50	%	400,000	400,000	400,000	0.8750		25.00		154.89		August 2015
Series S	4.00	%	1,077,280	1,077,280	1,077,280	1.0000		25.00		—		August 2015
Series V (5)	5.00	%	40,000	40,000	40,000	1.2500		25.00		—		May 2019
Series W (6)	(6)		1	1	1	(6)		(6)		(6)		January 2020

(1)Dividends are cumulative, subject to certain provisions.

(2)Units are redeemable at any time at par for cash at the option of the unit holder unless otherwise specified.

(5)The Series V Preferred Units are redeemable at any time after January 1, 2025 at par for cash at the option of the unit holder.


	September 30, 2023		December 31, 2022
Balance at beginning of period	$	177,943	$	196,075
Issuance of preferred units	—		—
Redemption of preferred units	(11,700)		(17,967)
Dividends paid on preferred units	(4,582)		(6,198)
Accrued dividends on preferred units	4,840		6,033
Balance at end of period	$	166,501	$	177,943

Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2023

Fair Value Disclosures [Abstract]

Fair value measurements, recurring and nonrecurring


	September 30, 2023
	Total		Level 1		Level 2		Level 3
Assets:
Marketable securities available-for-sale	$	9,616	$	—	$	9,616	$	—
Interest rate cap and swap agreements (included in Other assets)	77,921		—		77,921		—
Liabilities:
Interest rate cap and swap agreements (included in Other liabilities)	$	5,968	$	—	$	5,968	$	—


	December 31, 2022
	Total		Level 1		Level 2		Level 3
Assets:
Marketable securities available-for-sale	$	11,240	$	—	$	11,240	$	—
Interest rate cap and swap agreements (included in Other assets)	57,660		—		57,660		—
Liabilities:
Interest rate cap and swap agreements (included in Other liabilities)	$	10,142	$	—	$	10,142	$	—

Fair value, by balance sheet grouping

The following table provides the carrying value and fair value of these financial instruments as of September 30, 2023 and December 31, 2022 (in thousands):


	September 30, 2023				December 31, 2022
	Carrying Value (1)		Fair Value		Carrying Value (1)		Fair Value

Debt and preferred equity investments	$	334,327	(2)		$	623,280	(2)

Fixed rate debt	$	3,248,724	$	3,188,552	$	5,015,814	$	4,784,691
Variable rate debt	120,148		118,264		520,148		519,669
	$	3,368,872	$	3,306,816	$	5,535,962	$	5,304,360

(1)Amounts exclude net deferred financing costs.

Commitments and Contingencies	9 Months Ended
Commitments and Contingencies	Sep. 30, 2023
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Legal Proceedings As of September 30, 2023, 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 Our management believes that the 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.

Significant Accounting Policies - Investment in Marketable Securities (Details)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($) security	Dec. 31, 2022 USD ($)
Investment in Marketable Securities
Commercial mortgage-backed securities	$ 9,616,000		$ 9,616,000		$ 11,240,000
Total investment in marketable securities	9,616,000		9,616,000		11,240,000
Proceeds from sale of marketable securities	0	$ 7,800,000	0	$ 7,800,000
Number of marketable securities sold \| security				1
Proceeds from repayment of debt marketable securities		3,700,000		$ 3,700,000
Number of securities repaid \| security				1
Equity marketable securities	0		0		0
Marketable securities, unrealized loss		$ 100,000		$ 6,100,000
Commercial mortgage-backed securities
Investment in Marketable Securities
Commercial mortgage-backed securities	9,616,000		9,616,000		11,240,000
Cost basis of commercial mortgage-backed securities	11,500,000		11,500,000		11,500,000
Unrealized loss			1,900,000		300,000
Fair value of security in a continuous unrealized loss position for less than 12 months	$ 9,600,000		$ 9,600,000		$ 11,200,000

Financial Instruments: Derivatives and Hedging (Tables)

9 Months Ended

Sep. 30, 2023

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	4.739	%	November 2022	November 2023	Other Assets	$	149
Interest Rate Cap	196,717		3.500	%	November 2022	November 2023	Other Assets	449
Interest Rate Cap	196,717		3.500	%	November 2022	November 2023	Other Liabilities	(449)
Interest Rate Swap	150,000		2.600	%	December 2021	January 2024	Other Assets	1,061
Interest Rate Swap	200,000		4.490	%	November 2022	January 2024	Other Assets	447
Interest Rate Swap	200,000		4.411	%	November 2022	January 2024	Other Assets	488
Interest Rate Cap	370,000		3.250	%	June 2023	June 2024	Other Assets	5,526
Interest Rate Cap	370,000		3.250	%	June 2023	June 2024	Other Liabilities	(5,519)
Interest Rate Swap	150,000		2.621	%	December 2021	January 2026	Other Assets	6,885
Interest Rate Swap	200,000		2.662	%	December 2021	January 2026	Other Assets	9,035
Interest Rate Swap	100,000		2.903	%	February 2023	February 2027	Other Assets	4,896
Interest Rate Swap	100,000		2.733	%	February 2023	February 2027	Other Assets	5,422
Interest Rate Swap	50,000		2.463	%	February 2023	February 2027	Other Assets	3,130
Interest Rate Swap	200,000		2.591	%	February 2023	February 2027	Other Assets	11,727
Interest Rate Swap	300,000		2.866	%	July 2023	May 2027	Other Assets	15,663
Interest Rate Swap	150,000		3.524	%	January 2024	May 2027	Other Assets	3,850
Interest Rate Swap	370,000		3.888	%	November 2022	June 2027	Other Assets	6,757
Interest Rate Swap	100,000		3.756	%	January 2023	January 2028	Other Assets	2,436
								$	71,953


	Notional Value		Strike Rate		Effective Date	Expiration Date	Classification	Fair Value
Interest Rate Cap	$	220,000	4.000	%	February 2023	February 2024	Asset	$	1,097
Interest Rate Cap	410,070		0.490	%	February 2022	May 2024	Asset	14,040
Interest Rate Cap	410,070		0.490	%	February 2022	May 2024	Asset	14,035
Interest Rate Cap	505,412		3.000	%	June 2023	June 2024	Asset	8,524
Interest Rate Cap	272,000		4.000	%	August 2023	August 2024	Asset	3,176
Interest Rate Cap	434,816		3.500	%	September 2023	September 2024	Asset	8,781
Interest Rate Swap	250,000		3.608	%	April 2023	February 2026	Asset	6,305
Interest Rate Swap	250,000		3.608	%	April 2023	February 2026	Asset	6,299
Interest Rate Swap	177,000		1.555	%	December 2022	February 2026	Asset	12,655
								$	74,912

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


	Amount of Gain Recognized in Other Comprehensive (Loss) Income				Location of Gain Reclassified from Accumulated Other Comprehensive Income into Income	Amount of Gain Reclassified from Accumulated Other Comprehensive Income into Income
	Three Months Ended September 30,					Three Months Ended September 30,
Derivative	2023		2022				2023		2022
Interest Rate Swaps/Caps	$	24,910	$	44,057		Interest expense	$	11,422	$	3,061
Share of unconsolidated joint ventures' derivative instruments	3,927		9,354			Equity in net loss from unconsolidated joint ventures	4,616		(138)
	$	28,837	$	53,411			$	16,038	$	2,923

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 nine months ended September 30, 2023 and 2022, respectively (in thousands):


	Amount of Gain Recognized in Other Comprehensive (Loss) Income				Location of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income	Amount of Gain Reclassified from Accumulated Other Comprehensive Income into Income
	Nine Months Ended September 30,					Nine Months Ended September 30,
Derivative	2023		2022				2023		2022
Interest Rate Swaps/Caps	$	52,624	$	83,768		Interest expense	$	31,043	$	(2,673)
Share of unconsolidated joint ventures' derivative instruments	13,467		22,951			Equity in net loss from unconsolidated joint ventures	11,986		(1,986)
	$	66,091	$	106,719			$	43,029	$	(4,659)

- 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 + Details

Investments in Unconsolidated Joint Ventures - Mortgages and Other Loans Payable (Details)	9 Months Ended
	Sep. 30, 2023 USD ($) extension	Dec. 31, 2022 USD ($)
Debt Instrument [Line Items]
Total fixed rate debt	$ 1,398,724,000	$ 3,115,814,000
Total floating rate debt	120,148,000	120,148,000
245 Park Avenue
Debt Instrument [Line Items]
Total fixed rate debt	0	1,712,750,000
Joint venture
Debt Instrument [Line Items]
Total fixed rate debt	11,911,148,000	10,855,657,000
Total floating rate debt	2,908,953,000	1,629,980,000
Total fixed rate and floating rate debt	14,820,101,000	12,485,637,000
Deferred financing costs, net	(112,175,000)	(136,683,000)
Total joint venture mortgages and other loans payable, net	$ 14,707,926,000	12,348,954,000
Joint venture \| Wharton Properties / Private Investor \| 717 Fifth Avenue
Debt Instrument [Line Items]
Economic Interest	10.92%
Interest rate, fixed rate debt (as a percent)	5.02%
Total fixed rate debt	$ 655,328,000	655,328,000
Joint venture \| Vornado Realty Trust \| 280 Park Avenue
Debt Instrument [Line Items]
Economic Interest	50.00%
Interest rate, floating rate debt (as a percent)	2.03%
Total fixed rate debt		1,200,000,000
Total floating rate debt	$ 1,200,000,000	0
Joint venture \| Wharton Properties \| 650 Fifth Avenue
Debt Instrument [Line Items]
Economic Interest	50.00%
Interest rate, fixed rate debt (as a percent)	5.45%
Interest rate, floating rate debt (as a percent)	2.25%
Total fixed rate debt	$ 65,000,000	65,000,000
Total floating rate debt	$ 210,000,000	210,000,000
Joint venture \| Wharton Properties \| 1552-1560 Broadway
Debt Instrument [Line Items]
Economic Interest	50.00%
Interest rate, floating rate debt (as a percent)	2.75%
Total floating rate debt	$ 193,132,000	193,132,000
Joint venture \| A Fund Managed By Meritz Alternative Investment Management \| 220 East 42nd Street
Debt Instrument [Line Items]
Economic Interest	51.00%
Interest rate, fixed rate debt (as a percent)	5.86%
Total fixed rate debt	$ 505,412,000	510,000,000
Joint venture \| A Fund Managed By Meritz Alternative Investment Management \| 15 Beekman
Debt Instrument [Line Items]
Economic Interest	20.00%
Interest rate, floating rate debt (as a percent)	1.61%
Total floating rate debt	$ 123,168,000	86,738,000
Joint venture \| RXR Realty Led Investment Group \| 5 Times Square
Debt Instrument [Line Items]
Economic Interest	31.55%
Interest rate, fixed rate debt (as a percent)	7.07%
Interest rate, floating rate debt (as a percent)	5.69%
Total fixed rate debt	$ 434,816,000	400,000,000
Total floating rate debt	$ 604,598,000	495,924,000
Joint venture \| Canadian Pension Plan Investment Board \| 10 East 53rd Street
Debt Instrument [Line Items]
Economic Interest	55.00%
Interest rate, fixed rate debt (as a percent)	5.45%
Total fixed rate debt	$ 220,000,000	220,000,000
Joint venture \| Allianz Real Estate of America \| 1515 Broadway
Debt Instrument [Line Items]
Economic Interest	56.87%
Interest rate, fixed rate debt (as a percent)	3.93%
Total fixed rate debt	$ 767,179,000	782,321,000
Joint venture \| Korean Institutional Investor / Israeli Institutional Investor \| 450 Park Avenue
Debt Instrument [Line Items]
Economic Interest	25.10%
Interest rate, fixed rate debt (as a percent)	6.10%
Total fixed rate debt	$ 267,000,000	267,000,000
Joint venture \| PGIM Real Estate \| 11 Madison Avenue
Debt Instrument [Line Items]
Economic Interest	60.00%
Interest rate, fixed rate debt (as a percent)	3.84%
Total fixed rate debt	$ 1,400,000,000	1,400,000,000
Joint venture \| National Pension Service of Korea / Hines Interest LP / International Investor \| One Madison Avenue
Debt Instrument [Line Items]
Economic Interest	25.50%
Interest rate, fixed rate debt (as a percent)	3.59%
Total fixed rate debt	$ 662,663,000	467,008,000
Joint venture \| Private Investors \| 115 Spring Street
Debt Instrument [Line Items]
Economic Interest	51.00%
Interest rate, fixed rate debt (as a percent)	5.50%
Total fixed rate debt	$ 65,550,000	0
Joint venture \| Private Investors \| 800 Third Avenue
Debt Instrument [Line Items]
Economic Interest	60.52%
Interest rate, fixed rate debt (as a percent)	3.37%
Total fixed rate debt	$ 177,000,000	177,000,000
Joint venture \| Private Investors \| 21 East 66th Street
Debt Instrument [Line Items]
Economic Interest	32.28%
Joint venture \| Private Investors \| East 21 Street 66, 1
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)	1.75%
Total floating rate debt	$ 12,000,000	0
Joint venture \| Private Investors \| East 21 Street 66, 2
Debt Instrument [Line Items]
Economic Interest	32.28%
Interest rate, floating rate debt (as a percent)	2.75%
Total floating rate debt	$ 555,000	586,000
Joint venture \| New York State Teacher's Retirement System \| 919 Third Avenue
Debt Instrument [Line Items]
Economic Interest	51.00%
Interest rate, fixed rate debt (as a percent)	6.11%
Joint venture \| Mori Trust Co., Ltd \| 245 Park Avenue
Debt Instrument [Line Items]
Economic Interest	50.10%
Interest rate, fixed rate debt (as a percent)	4.30%
Total fixed rate debt	$ 1,768,000,000	0
Joint venture \| RXR Realty / New York REIT \| Worldwide Plaza
Debt Instrument [Line Items]
Economic Interest	24.95%
Interest rate, fixed rate debt (as a percent)	3.98%
Total fixed rate debt	$ 1,200,000,000	1,200,000,000
Joint venture \| National Pension Service of Korea / Hines Interest LP \| One Vanderbilt Avenue
Debt Instrument [Line Items]
Economic Interest	71.01%
Interest rate, fixed rate debt (as a percent)	2.95%
Total fixed rate debt	$ 3,000,000,000	3,000,000,000
Joint venture \| Private Investor / Wharton Properties \| 115 Spring Street
Debt Instrument [Line Items]
Total floating rate debt	$ 0	65,550,000
Joint venture \| Private Investor / Wharton Properties \| 11 West 34th Street
Debt Instrument [Line Items]
Economic Interest	30.00%
Interest rate, floating rate debt (as a percent)	1.45%
Total floating rate debt	$ 23,000,000	23,000,000
Joint venture \| Private Investor / Wharton Properties \| 121 Greene Street
Debt Instrument [Line Items]
Total floating rate debt	$ 0	12,550,000
Joint venture \| Israeli Institutional Investor \| 2 Herald Square
Debt Instrument [Line Items]
Economic Interest	51.00%
Interest rate, floating rate debt (as a percent)	2.06%
Total floating rate debt	$ 182,500,000	182,500,000
Joint venture \| Prudential Real Estate Investors \| 100 Park Avenue
Debt Instrument [Line Items]
Economic Interest	49.90%
Interest rate, floating rate debt (as a percent)	2.36%
Total floating rate debt	$ 360,000,000	360,000,000
Joint venture \| Winthrop Capital Advisors \| 625 Madison Avenue
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	6.05%
Total fixed rate debt	$ 223,200,000	0
Joint venture \| Mortgage loan \| Wharton Properties \| 21 East 66th Street
Debt Instrument [Line Items]
Total fixed rate debt	0	12,000,000
Joint venture \| Mortgage loan \| New York State Teacher's Retirement System \| 919 Third Avenue
Debt Instrument [Line Items]
Total fixed rate debt	500,000,000	$ 500,000,000
Joint venture \| Construction Loans \| One Madison Avenue
Debt Instrument [Line Items]
Maximum facility capacity	$ 1,250,000,000
Term	5 years
Number of extension options \| extension	1
Period of extension options	1 year
Joint venture \| Construction Loans \| 15 Beekman
Debt Instrument [Line Items]
Maximum facility capacity	$ 125,000,000

Corporate Indebtedness - Additional Information (Details)	1 Months Ended	9 Months Ended
	Oct. 31, 2022 USD ($) extensionOption	Sep. 30, 2023 USD ($) extension	Jan. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Corporate Indebtedness
Revolving credit facility, net		$ 394,368,000		$ 443,217,000
Term Loan A, Maturity May 2026 \| Term Loan
Corporate Indebtedness
Maximum facility capacity		$ 1,050,000,000.00
Term Loan A, Maturity May 2026 \| SOFR \| Term Loan
Corporate Indebtedness
Interest rate added to base rate (as a percent)		1.60%
Term Loan A, Maturity May 2026 \| SOFR \| Minimum \| Term Loan
Corporate Indebtedness
Interest rate added to base rate (as a percent)		0.80%
Term Loan A, Maturity May 2026 \| SOFR \| Maximum \| Term Loan
Corporate Indebtedness
Interest rate added to base rate (as a percent)		1.60%
Term Loan B, Maturity November 2024 \| Term Loan
Corporate Indebtedness
Maximum facility capacity		$ 200,000,000
Term Loan B, Maturity November 2024 \| SOFR \| Term Loan
Corporate Indebtedness
Interest rate added to base rate (as a percent)		1.65%
Term Loan B, Maturity November 2024 \| SOFR \| Minimum \| Term Loan
Corporate Indebtedness
Interest rate added to base rate (as a percent)		0.85%
Term Loan B, Maturity November 2024 \| SOFR \| Maximum \| Term Loan
Corporate Indebtedness
Interest rate added to base rate (as a percent)		1.65%
Revolving Credit Facility
Corporate Indebtedness
Facility fee (as a percent)		0.30%
Revolving credit facility, net		$ 400,000,000
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%
Term Loan
Corporate Indebtedness
Long-term debt, carrying value		$ 1,250,000,000
Term Loan \| Line of Credit
Corporate Indebtedness
Long-term debt, carrying value		1,200,000,000		1,200,000,000
2012 Credit Facility
Corporate Indebtedness
Letters of credit		2,000,000
Ability to borrow under line of credit facility		850,000,000
2012 Credit Facility \| Line of Credit
Corporate Indebtedness
Long-term debt, carrying value		$ 394,400,000		443,200,000
Revolving Credit Facility \| SOFR \| Line of Credit
Corporate Indebtedness
Interest rate added to base rate (as a percent)		0.10%
Revolving Credit Facility \| Revolving Credit Facility, Maturity May 2026 \| Line of Credit
Corporate Indebtedness
Maximum facility capacity		$ 1,250,000,000
Number of extensions \| extension		2
Term of extension		6 months
Maximum borrowing capacity, optional expansion		$ 4,500,000,000
Revolving Credit Facility \| Revolving Credit Facility, Maturity May 2026 \| SOFR \| Line of Credit
Corporate Indebtedness
Interest rate added to base rate (as a percent)		1.40%
Revolving Credit Facility \| Revolving Credit Facility, Maturity May 2026 \| SOFR \| Minimum \| Line of Credit
Corporate Indebtedness
Interest rate added to base rate (as a percent)		0.725%
Revolving Credit Facility \| Revolving Credit Facility, Maturity May 2026 \| SOFR \| Maximum \| Line of Credit
Corporate Indebtedness
Interest rate added to base rate (as a percent)		1.40%
Line of Credit \| Term Loan 2022 \| Line of Credit
Corporate Indebtedness
Long-term debt, carrying value				$ 398,200,000
Debt instrument face amount		$ 425,000,000	$ 425,000,000
Number of extension options \| extensionOption	1
Period of extension options	6 months
Debt instrument, face amount, higher borrowing capacity option	$ 500,000,000
Debt instrument, face amount, increase limit			$ 25,000,000
Line of Credit \| Term Loan 2022 \| SOFR \| Line of Credit
Corporate Indebtedness
Interest rate added to base rate (as a percent)		0.10%
Line of Credit \| Term Loan 2022 \| SOFR \| Minimum \| Line of Credit
Corporate Indebtedness
Interest rate added to base rate (as a percent)		1.00%
Line of Credit \| Term Loan 2022 \| SOFR \| Maximum \| Line of Credit
Corporate Indebtedness
Interest rate added to base rate (as a percent)		1.80%

Deferred Costs (Tables)

9 Months Ended

Sep. 30, 2023

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

Schedule of components of deferred costs

Deferred costs as of September 30, 2023 and December 31, 2022 consisted of the following (in thousands):


	September 30, 2023		December 31, 2022
Deferred leasing costs	$	392,760	$	407,188
Less: accumulated amortization	(284,390)		(286,031)
Deferred costs, net	$	108,370	$	121,157

Deferred Costs

9 Months Ended

Sep. 30, 2023

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

Deferred Costs

Deferred costs as of September 30, 2023 and December 31, 2022 consisted of the following (in thousands):


	September 30, 2023		December 31, 2022
Deferred leasing costs	$	392,760	$	407,188
Less: accumulated amortization	(284,390)		(286,031)
Deferred costs, net	$	108,370	$	121,157

Corporate Indebtedness (Tables)

9 Months Ended

Sep. 30, 2023

Debt Disclosure [Abstract]

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


Issuance	September 30, 2023 Unpaid Principal Balance		September 30, 2023 Accreted Balance		December 31, 2022 Accreted Balance		Interest Rate (1)			Initial Term (in Years)	Maturity Date
December 17, 2015 (2)	$	100,000	$	100,000	$	100,000		4.27	%	10	December 2025


	$	100,000	$	100,000	$	100,000
Deferred financing costs, net	—		(231)		(308)
	$	100,000	$	99,769	$	99,692

(1)Interest rate as of September 30, 2023.

(2)Issued by the Company and the Operating Partnership as co-obligors.

Schedule of combined aggregate principal maturities


	Scheduled Amortization		Principal		Revolving Credit Facility		Unsecured Term Loans		Trust Preferred Securities		Senior Unsecured Notes		Total		Joint Venture Debt
Remaining 2023	$	1,486	$	260,149	$	—	$	—	$	—	$	—	$	261,635	$	525,028
2024	4,488		332,749		—		200,000		—		—		537,237		1,318,885
2025	—		370,000		—		—		—		100,000		470,000		1,618,381
2026	—		—		—		—		—		—		—		563,977
2027	—		550,000		400,000		1,000,000		—		—		1,950,000		1,189,059
Thereafter	—		—		—		50,000		100,000		—		150,000		2,130,404
	$	5,974	$	1,512,898	$	400,000	$	1,250,000	$	100,000	$	100,000	$	3,368,872	$	7,345,734

Schedule of consolidated interest expense, excluding capitalized interest

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


	Three Months Ended September 30,				Nine Months Ended September 30,
	2023		2022		2023		2022
Interest expense before capitalized interest	$	52,877	$	40,553	$	183,652	$	105,165
Interest on financing leases	1,113		1,099		3,329		3,453
Interest capitalized	(25,483)		(19,659)		(77,916)		(55,952)
Amortization of discount on assumed debt	—		—		2,842		—
Interest income	(1,067)		(169)		(2,193)		(812)
Interest expense, net	$	27,440	$	21,824	$	109,714	$	51,854

- 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.

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+ Details

Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Revenues
Rental revenue, net	$ 150,991	$ 162,952	$ 531,978	$ 474,215
Investment income	9,689	29,513	27,849	69,808
Other income	12,540	19,991	58,038	57,842
Total revenues	173,220	212,456	617,865	601,865
Expenses
Operating expenses, including related party expenses of $2 and $3 in 2023, and $0 and $5,695 in 2022	49,585	45,011	148,606	127,151
Real estate taxes	31,195	35,111	112,463	96,677
Operating lease rent	7,253	7,388	20,209	20,429
Interest expense, net of interest income	27,440	21,824	109,714	51,854
Amortization of deferred financing costs	2,152	2,043	6,327	5,908
Depreciation and amortization	50,212	48,462	197,844	142,359
Loan loss and other investment reserves, net of recoveries	0	0	6,890	0
Transaction related costs	166	292	1,083	321
Marketing, general and administrative	22,873	21,276	69,132	69,574
Total expenses	190,876	181,407	672,268	514,273
Equity in net loss from unconsolidated joint ventures	(15,126)	(21,997)	(44,470)	(31,262)
Equity in net loss on sale of interest in unconsolidated joint venture/real estate	0	0	(79)	(131)
Purchase price and other fair value adjustments	10,183	(1,117)	(6,987)	(7,348)
Gain (loss) on sale of real estate, net	516	4,276	(27,813)	(61,104)
Depreciable real estate reserves and impairment	389	0	(305,527)	0
Net (loss) income	(21,694)	12,211	(439,279)	(12,253)
Net loss (income) attributable to noncontrolling interests:
Noncontrolling interests in the Operating Partnership	1,574	(491)	27,493	1,831
Noncontrolling interests in other partnerships	1,794	993	4,459	(2,269)
Preferred units distributions	(1,903)	(1,598)	(5,352)	(4,844)
Net (loss) income attributable to SL Green	(20,229)	11,115	(412,679)	(17,535)
Perpetual preferred stock dividends	(3,738)	(3,738)	(11,213)	(11,213)
Net (loss) income attributable to SL Green common stockholders, basic	$ (23,967)	$ 7,377	$ (423,892)	$ (28,748)
Basic (loss) earnings per share (in dollars per share)	$ (0.38)	$ 0.11	$ (6.63)	$ (0.47)
Diluted (loss) earnings per share (in dollars per share)	$ (0.38)	$ 0.11	$ (6.63)	$ (0.47)
Basic weighted average common shares outstanding (in shares)	64,114	63,949	64,099	63,971
Diluted weighted average common shares and common share equivalents outstanding (in shares)	68,296	68,897	68,274	69,249

Properties Held for Sale and Property Dispositions (Tables)

9 Months Ended

Sep. 30, 2023

Discontinued Operations and Disposal Groups [Abstract]

Summary of properties sold

The following table summarizes the properties disposed of during the nine months ended September 30, 2023:

Property

Disposition Date

Property Type

Unaudited Approximate Usable Square Feet

Sales Price (1)

(in millions)

Loss on Sale (2)

(in millions)

245 Park Avenue (3)

June 2023

Fee Interest

1,782,793

1,995.0

(28.3)

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

- 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.

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+ Details

Corporate Indebtedness - Senior Unsecured Notes (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Debt disclosures by scheduled maturity date
Accreted Balance	$ 1,243,649	$ 1,641,552
Senior unsecured notes
Debt disclosures by scheduled maturity date
Unpaid Principal Balance	100,000
Accreted Balance	100,000	100,000
Deferred financing costs, net	(231)	(308)
Accreted Balance, net of deferred financing costs	99,769	99,692
Senior unsecured notes \| 4.27% Senior unsecured notes maturing on December 17, 2025
Debt disclosures by scheduled maturity date
Unpaid Principal Balance	100,000
Accreted Balance	$ 100,000	$ 100,000
Coupon Rate (as a percent)	4.27%
Initial Term (in Years)	10 years

Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Accumulated Other Comprehensive Income (Loss) of the Company [Roll Forward]
Beginning balance	$ 4,646,922
Ending balance	4,107,243
Deferred net losses from terminated hedges	400	$ 500
Net unrealized gain (loss) on derivative instruments
Accumulated Other Comprehensive Income (Loss) of the Company [Roll Forward]
Beginning balance	47,800
Other comprehensive income before reclassifications	49,326
Amounts reclassified from accumulated other comprehensive income	(29,175)
Ending balance	67,951
Net unrealized loss on marketable securities
Accumulated Other Comprehensive Income (Loss) of the Company [Roll Forward]
Beginning balance	(242)
Other comprehensive income before reclassifications	(1,525)
Amounts reclassified from accumulated other comprehensive income	0
Ending balance	(1,767)
Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss) of the Company [Roll Forward]
Beginning balance	49,604
Other comprehensive income before reclassifications	60,450
Amounts reclassified from accumulated other comprehensive income	(40,438)
Ending balance	69,616
Joint venture
Accumulated Other Comprehensive Income (Loss) of the Company [Roll Forward]
Beginning balance	4,968,171
Ending balance	5,381,367
Joint venture \| Net unrealized gain (loss) on derivative instruments
Accumulated Other Comprehensive Income (Loss) of the Company [Roll Forward]
Beginning balance	2,046
Other comprehensive income before reclassifications	12,649
Amounts reclassified from accumulated other comprehensive income	(11,263)
Ending balance	$ 3,432

- Definition

Amount of equity (deficit) attributable to parent and noncontrolling interest. Excludes temporary equity.

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-URI https://asc.fasb.org//1943274/2147480008/505-10-S99-1

Reference 38: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(g)(1)(ii))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1

Reference 39: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 323
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481687/323-10-50-3

Reference 40: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 28
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482907/825-10-50-28

Reference 41: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 45
-Paragraph 15
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481231/810-10-45-15

Reference 42: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 45
-Paragraph 16
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481231/810-10-45-16

Reference 43: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 55
-Paragraph 4I
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481175/810-10-55-4I

+ Details

Consolidated Statements of Comprehensive (Loss) Income (Partnership) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Net (loss) income	$ (21,694)	$ 12,211	$ (439,279)	$ (12,253)
Other comprehensive income:
Increase in unrealized value of derivative instruments, including SLGOP's share of joint venture derivative instruments	12,799	50,488	23,062	111,378
(Decrease) increase in unrealized value of marketable securities	(181)	1,605	(1,625)	(642)
Other comprehensive income	12,618	52,093	21,437	110,736
Comprehensive (loss) income	(9,076)	64,304	(417,842)	98,483
Net loss (income) attributable to noncontrolling interests	1,794	993	4,459	(2,269)
Other comprehensive income attributable to noncontrolling interests	(771)	(3,114)	(1,425)	(6,404)
Comprehensive (loss) income attributable to SL Green	(8,382)	60,094	(392,667)	86,797
SL Green Operating Partnership
Net (loss) income	(21,694)	12,211	(439,279)	(12,253)
Other comprehensive income:
Increase in unrealized value of derivative instruments, including SLGOP's share of joint venture derivative instruments	12,799	50,488	23,062	111,378
(Decrease) increase in unrealized value of marketable securities	(181)	1,605	(1,625)	(642)
Other comprehensive income	12,618	52,093	21,437	110,736
Comprehensive (loss) income	(9,076)	64,304	(417,842)	98,483
Net loss (income) attributable to noncontrolling interests	1,794	993	4,459	(2,269)
Other comprehensive income attributable to noncontrolling interests	(771)	(3,114)	(1,425)	(6,404)
Comprehensive (loss) income attributable to SL Green	$ (8,053)	$ 62,183	$ (414,808)	$ 89,810

Corporate Indebtedness - Schedule of Consolidated Interest Expense, Excluding Capitalized Interest (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Interest expense
Interest expense before capitalized interest	$ 52,877	$ 40,553	$ 183,652	$ 105,165
Interest on financing leases	1,113	1,099	3,329	3,453
Interest capitalized	(25,483)	(19,659)	(77,916)	(55,952)
Amortization of discount on assumed debt	0	0	2,842	0
Interest income	(1,067)	(169)	(2,193)	(812)
Interest expense, net	$ 27,440	$ 21,824	$ 109,714	$ 51,854

- Definition

Amount of the cost of borrowed funds accounted for as interest expense.

+ References + Details

- Definition

Amount of operating interest income, including, but not limited to, amortization and accretion of premiums and discounts on securities.

+ References + Details

Lease Income

9 Months Ended

Sep. 30, 2023

Leases [Abstract]

Lease Income

The Operating Partnership is the lessor and the sublessor to tenants under operating and sales-type leases. The minimum rental amounts due under the leases are generally subject to scheduled fixed increases or adjustments. The leases generally also require that the tenants reimburse us for increases in certain operating costs and real estate taxes above their base year costs.

The components of lease income from operating leases during the three and nine months ended September 30, 2023 and 2022 were as follows (in thousands):


	Three Months Ended September 30,				Nine Months Ended September 30,
	2023		2022		2023		2022
Fixed lease payments	$	131,664	$	142,778	$	457,454	$	416,033
Variable lease payments	19,467		19,990		60,211		58,283
Total lease payments (1)	$	151,131	$	162,768	$	517,665	$	474,316
Amortization of acquired above and below-market leases	(140)		184		14,313		(101)
Total rental revenue	$	150,991	$	162,952	$	531,978	$	474,215

The components of lease income from sales-type leases during the three and nine months ended September 30, 2023 and 2022 were as follows (in thousands):


	Three Months Ended September 30,				Nine Months Ended September 30,
	2023		2022		2023		2022

Interest income (1)	$	1,113	$	1,099	$	3,328	$	3,286

(1)These amounts are included in Other income in our consolidated statements of operations.

Lease Income

The components of lease income from operating leases during the three and nine months ended September 30, 2023 and 2022 were as follows (in thousands):


	Three Months Ended September 30,				Nine Months Ended September 30,
	2023		2022		2023		2022
Fixed lease payments	$	131,664	$	142,778	$	457,454	$	416,033
Variable lease payments	19,467		19,990		60,211		58,283
Total lease payments (1)	$	151,131	$	162,768	$	517,665	$	474,316
Amortization of acquired above and below-market leases	(140)		184		14,313		(101)
Total rental revenue	$	150,991	$	162,952	$	531,978	$	474,215

The components of lease income from sales-type leases during the three and nine months ended September 30, 2023 and 2022 were as follows (in thousands):


	Three Months Ended September 30,				Nine Months Ended September 30,
	2023		2022		2023		2022

Interest income (1)	$	1,113	$	1,099	$	3,328	$	3,286

(1)These amounts are included in Other income in our consolidated statements of operations.

Properties Held for Sale and Property Dispositions (Details) $ in Millions	1 Months Ended	3 Months Ended	9 Months Ended
	Jun. 30, 2023 USD ($) ft²	Sep. 30, 2023 USD ($) ft²	Sep. 30, 2023 USD ($) ft²
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Unaudited Approximate Usable Square Feet \| ft²		29,708,910	29,708,910
Ownership percentage deconsolidated	50.10%
Investment fair value adjustment	$ 17.0	$ 17.0	$ 17.0
245 Park Avenue
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Unaudited Approximate Usable Square Feet \| ft²	1,782,793
Sale Price	$ 1,995.0
Loss on Sale	$ (28.3)
Ownership interest sold	49.90%
Properties Sold
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Employee-related liabilities		$ 8.0	$ 8.0

Debt and Preferred Equity Investments - Rollforward of Total Allowance for Loan Loss Reserves (Details) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2023 USD ($) loan	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) loan	Sep. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)
Loan loss reserve activity
Balance at beginning of year			$ 6,630	$ 6,630	$ 6,630
Current period provision for loan loss	$ 0	$ 0	6,890	$ 0	0
Balance at end of period	$ 13,520		$ 13,520		$ 6,630
Number of financing receivables on non-accrual without allowance for loan loss \| loan	1		1
Debt Investment, Two
Loan loss reserve activity
Financing receivable on non-accrual without allowance	$ 50,000		$ 50,000

Accumulated Other Comprehensive Income (Tables)

9 Months Ended

Sep. 30, 2023

Equity [Abstract]

Schedule of accumulated other comprehensive loss

The following tables set forth the changes in accumulated other comprehensive income by component as of September 30, 2023 (in thousands):


	Net unrealized gain (loss) on derivative instruments (1)		SL Green’s share of joint venture net unrealized gain (loss) on derivative instruments (2)		Net unrealized loss on marketable securities		Total
Balance at December 31, 2022	$	47,800	$	2,046	$	(242)	$	49,604
Other comprehensive income before reclassifications	49,326		12,649		(1,525)		60,450
Amounts reclassified from accumulated other comprehensive income	(29,175)		(11,263)		—		(40,438)
Balance at September 30, 2023	$	67,951	$	3,432	$	(1,767)	$	69,616

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

Noncontrolling Interests on the Company's Consolidated Financial Statements - Common Unit Activity (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended		12 Months Ended
	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Rollforward Analysis of Preferred Unit Activity
Redemption of preferred units	$ (29,817)		$ (29,817)
SL Green Operating Partnership
Rollforward Analysis of Preferred Unit Activity
Redemption of preferred units	$ (29,817)		(29,817)
SL Green Operating Partnership \| Series I Preferred Units
Rollforward Analysis of Preferred Unit Activity
Balance at beginning of period		$ 177,943	$ 196,075	$ 196,075
Issuance of preferred units		0		0
Redemption of preferred units		(11,700)		(17,967)
Dividends paid on preferred units		(4,582)		(6,198)
Accrued dividends on preferred units		4,840		6,033
Balance at end of period		$ 166,501		$ 177,943

Organization and Basis of Presentation - Schedule of Commercial Office Properties (Details)	Sep. 30, 2023 ft² building
Real estate properties
Number of Buildings \| building	51
Approximate Square Feet unaudited (sqft)	29,708,910
Commercial properties
Real estate properties
Number of Buildings \| building	49
Approximate Square Feet unaudited (sqft)	29,346,644
Consolidated
Real estate properties
Number of Buildings \| building	27
Approximate Square Feet unaudited (sqft)	10,886,630
Consolidated \| Commercial properties
Real estate properties
Number of Buildings \| building	26
Approximate Square Feet unaudited (sqft)	10,746,248
Unconsolidated
Real estate properties
Number of Buildings \| building	24
Approximate Square Feet unaudited (sqft)	18,822,280
Unconsolidated \| Commercial properties
Real estate properties
Number of Buildings \| building	23
Approximate Square Feet unaudited (sqft)	18,600,396
Manhattan
Real estate properties
Number of Buildings \| building	42
Approximate Square Feet unaudited (sqft)	28,483,844
Manhattan \| Office
Real estate properties
Number of Buildings \| building	25
Approximate Square Feet unaudited (sqft)	23,811,315
Weighted Average Leased Occupancy	89.30%
Manhattan \| Retail
Real estate properties
Number of Buildings \| building	10
Approximate Square Feet unaudited (sqft)	312,753
Weighted Average Leased Occupancy	91.00%
Manhattan \| Development/Redevelopment
Real estate properties
Number of Buildings \| building	7
Approximate Square Feet unaudited (sqft)	4,359,776
Manhattan \| Residential
Real estate properties
Number of Buildings \| building	2
Approximate Square Feet unaudited (sqft)	362,266
Weighted Average Leased Occupancy	99.00%
Manhattan \| Consolidated
Real estate properties
Number of Buildings \| building	19
Approximate Square Feet unaudited (sqft)	9,883,448
Manhattan \| Consolidated \| Office
Real estate properties
Number of Buildings \| building	13
Approximate Square Feet unaudited (sqft)	8,399,141
Manhattan \| Consolidated \| Retail
Real estate properties
Number of Buildings \| building	2
Approximate Square Feet unaudited (sqft)	17,888
Manhattan \| Consolidated \| Retail \| 7 Dey / 185 Broadway
Real estate properties
Approximate Square Feet unaudited (sqft)	140,382
Manhattan \| Consolidated \| Development/Redevelopment
Real estate properties
Number of Buildings \| building	4
Approximate Square Feet unaudited (sqft)	1,466,419
Manhattan \| Consolidated \| Residential
Real estate properties
Number of Buildings \| building	1
Approximate Square Feet unaudited (sqft)	140,382
Manhattan \| Consolidated \| Residential \| 7 Dey / 185 Broadway
Real estate properties
Approximate Square Feet unaudited (sqft)	50,206
Manhattan \| Unconsolidated
Real estate properties
Number of Buildings \| building	23
Approximate Square Feet unaudited (sqft)	18,600,396
Manhattan \| Unconsolidated \| Office
Real estate properties
Number of Buildings \| building	12
Approximate Square Feet unaudited (sqft)	15,412,174
Manhattan \| Unconsolidated \| Retail
Real estate properties
Number of Buildings \| building	8
Approximate Square Feet unaudited (sqft)	294,865
Manhattan \| Unconsolidated \| Development/Redevelopment
Real estate properties
Number of Buildings \| building	3
Approximate Square Feet unaudited (sqft)	2,893,357
Manhattan \| Unconsolidated \| Residential
Real estate properties
Number of Buildings \| building	1
Approximate Square Feet unaudited (sqft)	221,884
Suburban \| Office
Real estate properties
Number of Buildings \| building	7
Approximate Square Feet unaudited (sqft)	862,800
Weighted Average Leased Occupancy	77.40%
Suburban \| Consolidated \| Office
Real estate properties
Number of Buildings \| building	7
Approximate Square Feet unaudited (sqft)	862,800
Suburban \| Unconsolidated \| Office
Real estate properties
Number of Buildings \| building	0
Approximate Square Feet unaudited (sqft)	0