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Document and Entity Information - USD ($)	12 Months Ended
Document and Entity Information - USD ($)	Dec. 31, 2012	Mar. 19, 2013
Document and Entity Information
Entity Registrant Name	RECKSON OPERATING PARTNERSHIP LP
Entity Central Index Key	0000930810
Document Type	10-K
Document Period End Date	Dec. 31, 2012
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Non-accelerated Filer
Entity Public Float	$ 0
Entity Common Stock, Shares Outstanding		0
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	FY

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2012	Dec. 31, 2011
Commercial real estate properties, at cost:
Land and land interests	$ 954,731	$ 829,914
Building and improvements	3,646,736	3,424,028
Building leasehold and improvements	782,260	782,260
Property under capital lease	12,208	12,208
Commercial real estate properties, gross	5,395,935	5,048,410
Less: accumulated depreciation	(742,659)	(613,543)
Total commercial real estate properties, net	4,653,276	4,434,867
Cash and cash equivalents	34,035	26,645
Restricted cash	21,074	23,491
Tenant and other receivables, net of allowance of $7,308 and $4,667 in 2012 and 2011, respectively	13,147	13,003
Deferred rents receivable, net of allowance of $16,501 and $15,942 in 2012 and 2011, respectively	150,535	132,846
Debt and preferred equity investments, net of allowance of $8,125 in 2011	340,885	600
Investment in unconsolidated joint venture		41,913
Deferred costs, net of accumulated amortization of $40,303 and $27,413 in 2012 and 2011, respectively	91,400	89,426
Other assets	94,210	93,607
Total assets	5,398,562	4,856,398
Liabilities
Mortgage note and other loans payable	550,023	721,590
Revolving credit facility	70,000	350,000
Term loan and senior unsecured notes	1,430,690	873,604
Accrued interest payable and other liabilities	25,366	18,254
Accounts payable and accrued expenses	50,692	43,130
Deferred revenue	176,120	194,850
Capitalized lease obligation	17,186	17,112
Deferred land lease payable	20,566	18,396
Security deposits	18,411	17,628
Total liabilities	2,359,054	2,254,564
Commitments and contingencies
Capital
General partner capital	2,686,766	2,242,844
Limited partner capital
Accumulated other comprehensive loss	(4,925)	(5,117)
Total ROP partner's capital	2,681,841	2,237,727
Noncontrolling interests in other partnerships	357,667	364,107
Total capital	3,039,508	2,601,834
Total liabilities and capital	$ 5,398,562	$ 4,856,398

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2012	Dec. 31, 2011
Consolidated Balance Sheets
Tenant and other receivables, allowance	$ 7,308	$ 4,667
Deferred rents receivable, allowance	16,501	15,942
Debt and preferred equity investments, allowance		8,125
Deferred costs, accumulated amortization	$ 40,303	$ 27,413

Consolidated Statements of Income and Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Revenues
Rental revenue, net	$ 436,965	$ 421,475	$ 406,237
Escalation and reimbursement	76,509	72,892	71,504
Investment and preferred equity income	9,497	3,077	1,231
Other income	5,838	4,113	11,163
Total revenues	528,809	501,557	490,135
Expenses
Operating expenses, including $15,573 (2012), $15,520 (2011) and $17,342 (2010) paid to related parties	118,549	118,326	112,517
Real estate taxes	90,174	83,838	81,214
Ground rent	17,098	14,549	14,600
Interest expense, net of interest income	108,566	82,422	70,827
Amortization of deferred financing costs	5,712	1,837	684
Depreciation and amortization	142,957	132,251	124,677
Loan loss reserves, net of recoveries	(472)	(2,425)
Transaction related costs	1,943	243	24
Marketing, general and administrative	339	346	493
Total expenses	484,866	431,387	405,036
Income from continuing operations before equity in net income from unconsolidated joint venture, equity in net income on sale of interest in unconsolidated joint venture, depreciable real estate reserves, loss on early extinguishment of debt and noncontrolling interests	43,943	70,170	85,099
Equity in net income from unconsolidated joint venture	966	497	711
Equity in net gain on sale of interest in unconsolidated joint venture	1,001
Depreciable real estate reserves		(5,789)
Loss on early extinguishment of debt	(6,904)		(1,202)
Net income	39,006	64,878	84,608
Net income attributable to noncontrolling interests in other partnerships	(6,013)	(9,886)	(13,682)
Net income attributable to ROP common unitholder	32,993	54,992	70,926
Other comprehensive income (loss)
Unrealized gain (loss) on derivative instruments	192	(5,117)
Comprehensive income attributable to ROP common unitholder	$ 33,185	$ 49,875	$ 70,926

Consolidated Statements of Income and Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Consolidated Statements of Income and Comprehensive Income
Operating expenses, paid to related parties	$ 15,573	$ 15,520	$ 17,342

Consolidated Statements of Capital - USD ($) $ in Thousands	3 Months Ended				12 Months Ended
Consolidated Statements of Capital - USD ($) $ in Thousands	Dec. 31, 2012	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Increase (Decrease) in Partners' Capital
Balance		$ 2,601,834		$ 3,398,551	$ 2,601,834	$ 3,398,551	$ 3,431,178
Contributions					2,374,499	823,171	824,028
Distributions					(1,976,023)	(1,679,649)	(941,263)
Net income	$ 6,000	8,864	$ 4,779	29,009	39,006	64,878	84,608
Other comprehensive income (loss)					192	(5,117)
Balance	3,039,508		2,601,834		3,039,508	2,601,834	3,398,551
General Partners' Capital \| Class A Common Units
Increase (Decrease) in Partners' Capital
Balance		2,242,844		2,901,149	2,242,844	2,901,149	2,934,380
Contributions					2,374,499	823,171	824,028
Distributions					(1,963,570)	(1,536,468)	(928,185)
Net income					32,993	54,992	70,926
Balance	2,686,766		2,242,844		2,686,766	2,242,844	2,901,149
Noncontrolling Interests In Other Partnerships
Increase (Decrease) in Partners' Capital
Balance		364,107		$ 497,402	364,107	497,402	496,798
Distributions					(12,453)	(143,181)	(13,078)
Net income					6,013	9,886	13,682
Balance	357,667		364,107		357,667	364,107	$ 497,402
Accumulated Other Comprehensive Loss
Increase (Decrease) in Partners' Capital
Balance		$ (5,117)			(5,117)
Other comprehensive income (loss)					192	(5,117)
Balance	$ (4,925)		$ (5,117)		$ (4,925)	$ (5,117)

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Operating Activities
Net income	$ 39,006	$ 64,878	$ 84,608
Adjustment to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	148,669	134,088	125,361
Equity in net gain on sale of interest in unconsolidated joint venture	(1,001)
Equity in net income from unconsolidated joint venture	(966)	(497)	(711)
Distributions of cumulative earnings from unconsolidated joint venture	444	497	711
Loss on early extinguishment of debt	6,904		1,202
Loan loss reserves, net of recoveries	(472)	(2,425)
Depreciable real estate reserves		5,789
Deferred rents receivable	(18,821)	(27,020)	(27,683)
Other non-cash adjustments	(20,519)	(20,487)	(23,416)
Changes in operating assets and liabilities:
Restricted cash-operations	(1,787)	(3,300)	(704)
Tenant and other receivables	(2,945)	(993)	(758)
Deferred lease costs	(9,235)	(13,306)	(15,109)
Other assets	(826)	(2,773)	107
Accounts payable, accrued expenses and other liabilities	7,884	3,086	(37)
Deferred revenue and land lease payable	2,555	(1,173)	(5,561)
Net cash provided by operating activities	148,890	136,364	138,010
Investing Activities
Acquisitions of real estate property	(277,060)	(2,744)
Additions to land, buildings and improvements	(43,072)	(51,445)	(50,077)
Restricted cash-capital improvements	4,204	(1,529)	4,319
Distributions in excess of cumulative earnings from unconsolidated joint venture	152	769	2,842
Net proceeds from disposition of joint venture interest	44,297
Debt and preferred equity and other investments, net of repayments/participations	(3,516)	28,400	1,300
Net cash used in investing activities	(274,995)	(26,549)	(41,616)
Financing Activities
Proceeds from mortgage note and other loans payable		500,000
Repayments of mortgage note and other loans payable	(192,980)	(222,293)	(16,172)
Proceeds from revolving credit facility and senior unsecured notes	1,751,480	599,543	250,000
Repayments of revolving credit facility and senior unsecured notes	(1,478,284)	(84,823)	(205,859)
Contributions from common unitholder	2,037,115	804,229	824,028
Distributions to noncontrolling interests in other partnerships	(12,453)	(143,181)	(13,078)
Distributions to common unitholder	(1,963,570)	(1,536,468)	(928,185)
Deferred loan costs and capitalized lease obligation	(7,813)	(24,626)	(4,709)
Net cash provided by (used in) financing activities	133,495	(107,619)	(93,975)
Net increase in cash and cash equivalents	7,390	2,196	2,419
Cash and cash equivalents at beginning of year	26,645	24,449	22,030
Cash and cash equivalents at end of year	34,035	26,645	24,449
Supplemental Cash Flow Disclosure
Interest paid	$ 107,902	$ 78,693	$ 69,458

Organization and Basis of Presentation

12 Months Ended

Dec. 31, 2012

Organization and Basis of Presentation

Organization and Basis of Presentation

1. Organization and Basis of Presentation

Reckson Operating Partnership, L.P., or ROP, commenced operations on June 2, 1995. The sole general partner of ROP is a wholly-owned subsidiary of SL Green Operating Partnership, L.P., or the Operating Partnership. The sole limited partner of ROP is the Operating Partnership.

ROP is engaged in the acquisition, ownership, management and operation of commercial real estate properties, principally office properties and also owns land for future development located in the New York City, Westchester County and Connecticut, which collectively is also known as the New York Metropolitan area.

SL Green Realty Corp., or SL Green, and the Operating Partnership were formed in June 1997. SL Green 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," "us" and the "Company" means ROP and all entities owned or controlled by ROP.

On January 25, 2007, SL Green completed the acquisition of all of the outstanding shares of common stock of Reckson Associates Realty Corp., or RARC, the prior general partner of ROP. This transaction is referred to herein as the Merger.

In connection with the closing of our 2011 revolving credit facility and new 2012 credit facility in which we, along with SL Green and the Operating Partnership are borrowers, SL Green transferred five properties, with total assets aggregating to $683.8 million at November 1, 2011 and transferred three additional properties, with total assets aggregating to $320.2 million at December 31, 2012, to ROP. Under the Business Combinations guidance, these were determined to be transfers of businesses between the indirect parent company and its wholly-owned subsidiary. As such, the assets and liabilities were transferred at their carrying value. These transfers are required to be recorded as of the beginning of the current reporting period as though the assets and liabilities had been transferred at that date. The financial statements and financial information presented for all prior years have been retrospectively adjusted to furnish comparative information.

On September 30, 2012, SL Green transferred $324.9 million of its preferred equity investments to ROP, one of which was subject to a secured $50.0 million loan. Under the Business Combinations guidance, these transfers were determined to be transfers of assets between the indirect parent company and its wholly-owned subsidiary. As such, the assets were transferred at their carrying value and accounted for prospectively from the date of transfer.

As of December 31, 2012, we owned the following interests in commercial office properties in the New York Metropolitan area, primarily in midtown Manhattan, a borough of New York City. Our investments in the New York Metropolitan area also include investments in Westchester County and Connecticut, which are collectively known as the Suburban assets:

Location	Ownership

Manhattan	Consolidated properties	13	7,201,400	96.0	%
Suburban	Consolidated properties	17	2,785,500	79.5	%

		30	9,986,900	91.4	%

(1): The weighted average occupancy represents the total leased square feet divided by total available rentable square feet.

At December 31, 2012, we also own a development property encompassing approximately 104,000 square feet as well as an inventory of development parcels that aggregated approximately 81 acres of land in four separate parcels on which we can, based on estimates at December 31, 2012, develop approximately 1.1 million square feet of office space and in which we have invested approximately $67.1 million. As of December 31, 2012, we also held preferred equity investments with a book value of $340.9 million.

- Definition

The entire disclosure for organization, consolidation and basis of presentation of financial statements disclosure.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055

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Reference 8: http://www.xbrl.org/2003/role/presentationRef
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-URI http://asc.fasb.org/extlink&oid=18733093&loc=d3e5614-111684

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-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6359566&loc=d3e326-107755

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Statement of Position (SOP)
-Number 94-6
-Paragraph 10
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 2-6
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 15: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Interpretation (FIN)
-Number 46R
-Paragraph 4, 14, 15
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 16: http://www.xbrl.org/2003/role/presentationRef
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Significant Accounting Policies

12 Months Ended

Dec. 31, 2012

Significant Accounting Policies

Significant Accounting Policies

2. 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 or as preferred equity investments. See Note 4, "Debt and Preferred Equity Investments" and Note 5, "Investments in Unconsolidated Joint Venture." ROP's investments in majority-owned and controlled real estate joint ventures are reflected in the accompanying financial statements on a consolidated basis with a reduction for the noncontrolling partners' interests. All significant intercompany balances and transactions have been eliminated.

We consolidate a variable interest entity, or VIE, in which we are considered a 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.

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

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

Investment in Commercial Real Estate Properties

Real estate properties are presented at cost less accumulated depreciation and amortization. Costs directly related to the development or redevelopment of properties are capitalized. Ordinary repairs and maintenance are expensed as incurred; major replacements and betterments, which improve or extend the life of the asset, are capitalized and depreciated over their estimated useful lives.

A property to be disposed of is reported at the lower of its carrying value or its estimated fair value, less its cost to sell. Once an asset is held for sale, depreciation expense is no longer recorded and the historic results are reclassified as discontinued operations.

Properties are depreciated using the straight-line method over the estimated useful lives of the assets. The estimated useful lives are as follows:

Category		Term

Building (fee ownership)		40 years
Building improvements		shorter of remaining life of the building or useful life
Building (leasehold interest)		lesser of 40 years or remaining term of the lease
Property under capital lease		remaining lease term
Furniture and fixtures		four to seven years
Tenant improvements		shorter of remaining term of the lease or useful life

Depreciation expense (including amortization of capital lease asset) amounted to approximately $130.3 million, $124.0 million and $118.5 million for the years ended December 31, 2012, 2011 and 2010, respectively.

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 and without interest charges for consolidated properties) to be generated by the property is less than the carrying value of the property. To the extent impairment has occurred, the loss will be measured as the excess of the carrying amount of the property over the calculated fair value of the property. In addition, we assess our investment in our unconsolidated joint venture 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 investment for impairment based on the joint venture's projected discounted cash flows. During 2011, we recorded a $5.8 million impairment charge in connection with the expected sale of our equity investment. These charges are included in depreciable real estate reserves in the consolidated statements of income and comprehensive income. We do not believe that the values of any of our consolidated properties were impaired at December 31, 2012 and December 31, 2011, respectively.

A variety of costs are incurred in the development and leasing of our properties. After determination is made to capitalize a cost, it is allocated to the specific component of a project that is benefited. Determination of when a development project is substantially complete and capitalization must cease involves a degree of judgment. The costs of land and building under development include specifically identifiable costs. The capitalized costs include, but are not limited to, pre-construction costs essential to the development of the property, development costs, construction costs, interest costs, real estate taxes, salaries and related costs and other costs incurred during the period of development. We consider a construction project as substantially completed and held available for occupancy upon the completion of tenant improvements, but no later than one year from cessation of major construction activity. We cease capitalization on the portions substantially completed and occupied or held available for occupancy, and capitalize only those costs associated with the portions under construction.

Results of operations of properties acquired are included in the consolidated statements of income and comprehensive income from the date of acquisition.

FASB guidance requires the acquiring entity in a business combination to measure the assets acquired, liabilities assumed (including contingencies) and any noncontrolling interests at their fair values on the acquisition date. The guidance also requires that acquisition- related transaction costs be expensed as incurred, acquired research and development value be capitalized and acquisition-related restructuring costs be capitalized only if they meet certain criteria. As such, we expense acquisition-related transaction costs as incurred, which are included in transaction related costs on our consolidated statements of income.

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

We recognized increases of approximately $20.2 million, $22.5 million and $22.4 million in rental revenue for the years ended December 31, 2012, 2011 and 2010, respectively, for the amortization of aggregate below-market leases in excess of above-market leases and a reduction in lease origination costs, resulting from the allocation of the purchase price of the applicable properties. We recognized an increase (reduction) in interest expense for the amortization of above-market rate mortgages assumed of approximately $0.7 million, $(1.2) million and $(1.8) million for the years ended December 31, 2012, 2011 and 2010, 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 December 31, 2012 and 2011 (amounts in thousands):

	December 31, 2012			December 31, 2011

Identified intangible assets (included in other assets):
Gross amount	$	199,845		$	181,028
Accumulated amortization		(125,009	)		(104,441	)

Net	$	74,836		$	76,587

Identified intangible liabilities (included in deferred revenue):
Gross amount	$	399,088		$	384,141
Accumulated amortization		(227,637	)		(190,995	)

Net	$	171,451		$	193,146

The estimated annual amortization of acquired below-market leases, net of acquired above-market leases (a component of rental revenue or depreciation expense), for each of the five succeeding years is as follows (amounts in thousands):


2013	$	11,419
2014		7,824
2015		6,362
2016		6,314
2017		6,290

The estimated annual amortization of all other identifiable assets (a component of depreciation and amortization expense) including tenant improvements for each of the five succeeding years is as follows (amounts in thousands):


2013	$	5,917
2014		4,651
2015		3,982
2016		2,832
2017		2,010

Investment in Unconsolidated Joint Ventures

We account for our investment in the unconsolidated joint venture under the equity method of accounting as we exercise significant influence, but do not control the entity and are not considered to be the primary beneficiary. We consolidate those joint ventures that we control or which are VIEs and where we are considered to be the primary beneficiary. In all the joint ventures, the rights of the joint venture partner are both protective as well as participating. Unless the joint venture is determined to be a VIE and we are the primary beneficiary in a VIE, these participating rights preclude us from consolidating these non-VIE entities. These investments are recorded initially at cost, as investments in unconsolidated joint ventures, and subsequently adjusted for equity in net income (loss) and cash contributions and distributions. Any difference between the carrying amount of these investments on our balance sheet and the underlying equity in net assets is amortized as an adjustment to equity in net income (loss) of unconsolidated joint ventures over the lesser of the joint venture term or 10 years. Equity income (loss) from unconsolidated joint ventures is allocated based on our ownership or economic interest in the joint venture. When a capital event (as defined in each joint venture agreement) such as a refinancing occurs, if return thresholds are met, future equity income will be allocated at our increased economic interest. We recognize incentive income from unconsolidated real estate joint ventures as income to the extent it is earned and not subject to a clawback feature. Distributions we receive from unconsolidated real estate joint ventures in excess of our basis in the investment are recorded as offsets to our investment balance if we remain liable for future obligations of the joint venture or may otherwise be committed to provide future additional financial support. None of the joint venture debt is recourse to us. See Note 5, "Investment in Unconsolidated Joint Venture."

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.

Deferred Lease Costs

Deferred lease costs consist of fees and direct costs incurred to initiate and renew operating leases and are amortized on a straight-line basis over the related lease term.

Deferred Financing Costs

Deferred financing costs represent commitment fees, legal, title and other third party costs associated with obtaining commitments for financing which result in a closing of such financing. These costs are amortized over the terms of the respective agreements. Unamortized deferred financing costs are expensed when the associated debt is refinanced or repaid before maturity. Costs incurred in seeking financing transactions, which do not close, are expensed in the period in which it is determined that the financing will not close.

Revenue Recognition

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

In addition to base rent, our tenants also generally will pay their pro rata share of increases in real estate taxes and operating expenses for the building over a base year. In some leases, in lieu of paying additional rent based upon increases in building operating expenses, the tenant will pay additional rent based upon increases in the wage rate paid to porters over the porters' wage rate in effect during a base year or increases in the consumer price index over the index value in effect during a base year. In addition, many of our leases contain fixed percentage increases over the base rent to cover escalations.

Electricity is most often supplied by the landlord either on a sub-metered basis, or rent inclusion basis (i.e., a fixed fee is included in the rent for electricity, which amount may increase based upon increases in electricity rates or increases in electrical usage by the tenant). Base building services other than electricity (such as heat, air conditioning and freight elevator service during business hours, and base building cleaning) are typically provided at no additional cost, with the tenant paying additional rent only for services which exceed base building services or for services which are provided outside normal business hours.

These escalations are based on actual expenses incurred in the prior calendar year. If the expenses in the current year are different from those in the prior year, then during the current year, the escalations will be adjusted to reflect the actual expenses for the current year.

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

Interest income on debt and preferred equity investments is recognized over the life of the investment using the effective interest method and recognized on the accrual basis. Fees received in connection with loan commitments are deferred until the loan is funded and are then recognized over the term of the loan as an adjustment to yield. Anticipated exit fees, whose collection is expected, are also recognized over the term of the loan as an adjustment to yield. Fees on commitments that expire unused are recognized at expiration.

Income recognition is generally suspended for debt and preferred equity investments 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 and principal becomes doubtful. Interest income recognition is resumed when the loan becomes contractually current and performance is demonstrated to be resumed. Interest is recorded as income on impaired loans only to the extent cash is received. Several of the 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 and outstanding principal are ultimately collectible, based on the underlying collateral and operations of the borrower. If management cannot make this determination, interest income above the current pay rate is recognized only upon actual receipt.

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.

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

Allowance for Doubtful Accounts

We maintain an allowance for doubtful accounts for estimated losses resulting from the inability of our tenants to make required payments. If the financial condition of a specific tenant were to deteriorate, resulting in an impairment of its ability to make payments, additional allowances may be required.

Reserve for Possible Credit Losses

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

Where impairment is indicated on an investment that is held to maturity, a valuation allowance is measured based upon the excess of the recorded investment amount over the net fair value of the collateral. Any deficiency between the carrying amount of an asset and the calculated value of the collateral is charged to expense. The write off of the reserve balance is called a charge off. We recorded loan loss reserves of zero, $0.7 million and zero in loan loss reserves or charge offs during the years ended December 31, 2012, 2011 and 2010, respectively, on investments held to maturity. We recorded $0.5 million, $3.1 million and zero in recoveries during the years ended December 31, 2012, 2011 and 2010, respectively, in connection with the sale of our debt investments. This is included in loan loss reserves, net of recoveries in the accompanying consolidated statements of income and comprehensive income.

Rent Expense

Rent expense is recognized on a straight-line basis over the initial term of the lease. The excess of the rent expense recognized over the amounts contractually due pursuant to the underlying lease is included in the deferred land lease payable in the accompanying balance sheets.

Income Taxes

No provision has been made for income taxes in the accompanying consolidated financial statements since such taxes, if any, are the responsibility of the individual partners.

Earnings per Unit

Earnings per unit was not computed in 2012, 2011 and 2010 as there were no outstanding common units held by third parties at December 31, 2012, 2011 and 2010.

Use of Estimates

The preparation of financial statements in conformity with U.S. GAAP 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.

Exchangeable Debt Instruments

The initial proceeds from exchangeable debt that may be settled in cash, including partial cash settlements, must be bifurcated between a liability component and an equity component associated with the embedded conversion option. The objective of the accounting guidance is to require the liability and equity components of exchangeable debt to be separately accounted for in a manner such that the interest expense on the exchangeable debt is not recorded at the stated rate of interest but rather at an effective rate that reflects the issuer's conventional debt borrowing rate at the date of issuance. We calculate the liability component of exchangeable debt based on the present value of the contractual cash flows discounted at a comparable market conventional debt borrowing rate at the date of issuance. The difference between the principal amount and the fair value of the liability component is reported as a discount on the exchangeable debt that is accreted as additional interest expense from the issuance date through the contractual maturity date using the effective interest method. A portion of this additional interest expense is capitalized to the development and redevelopment balances qualifying for interest capitalization each period. The liability component of the exchangeable debt is reported net of discounts on our consolidated balance sheets. We calculate the equity component of exchangeable debt based on the difference between the initial proceeds received from the issuance of the exchangeable debt and the fair value of the liability component at the issuance date. The equity component is included in additional paid-in-capital, net of issuance costs, on our consolidated balance sheets. We allocate issuance costs for exchangeable debt between the liability and the equity components based on their relative values.

Derivative Instruments

In the normal course of business, we use a variety of derivative instruments to manage, or hedge, interest rate risk. We require that hedging derivative instruments are effective in reducing the interest rate risk exposure that they are designated to hedge. This effectiveness is essential for qualifying for hedge accounting. Some derivative instruments are associated with an anticipated transaction. In those cases, hedge effectiveness criteria also require that it be probable that the underlying transaction occurs. Instruments that meet these hedging criteria are formally designated as hedges at the inception of the derivative contract.

To determine the fair values of derivative instruments, we use a variety of methods and assumptions that are based on market conditions and risks existing at each balance sheet date. For the majority of financial instruments including most derivatives, long-term investments and long-term debt, standard market conventions and techniques such as discounted cash flow analysis, option pricing models, replacement cost, and termination cost are used to determine fair value. All methods of assessing fair value result in a general approximation of value, and such value may never actually be realized.

In the normal course of business, we are exposed to the effect of interest rate changes and limit these risks by following established risk management policies and procedures including the use of derivatives. To address exposure to interest rates, derivatives are used primarily to fix the rate on debt based on floating-rate indices and manage the cost of borrowing obligations.

We use a variety of commonly used derivative products that are considered plain vanilla derivatives. These derivatives typically include interest rate swaps, caps, collars and floors. We expressly prohibit the use of unconventional derivative instruments and using derivative instruments for trading or speculative purposes. Further, we have a policy of only entering into contracts with major financial institutions based upon their credit ratings and other factors.

We may employ swaps, forwards or purchased options to hedge qualifying forecasted transactions. Gains and losses related to these transactions are deferred and recognized in net income as interest expense in the same period or periods that the underlying transaction occurs, expires or is otherwise terminated.

Hedges that are reported at fair value and presented on the balance sheet could be characterized as cash flow hedges or fair value hedges. Interest rate caps and collars are examples of cash flow hedges. Cash flow hedges address the risk associated with future cash flows of interest payments. For all hedges held by us and which were deemed to be fully effective in meeting the hedging objectives established by our corporate policy governing interest rate risk management, no net gains or losses were reported in earnings. The changes in fair value of hedge instruments are reflected in accumulated other comprehensive income. For derivative instruments not designated as hedging instruments, the gain or loss resulting from the change in the estimated fair value of the derivative instruments is recognized in current earnings during the period of change.

Fair Value Measurements

Fair value is a market-based measurement, not an entity-specific measurement, and should be determined based on the assumptions that market participants would use in pricing the asset or liability. As a basis for considering market participant assumptions in fair value measurements, FASB guidance establishes a fair value hierarchy that distinguishes between market participant assumptions based on market data obtained from sources independent of the reporting entity (observable inputs that are classified within levels one and two of the hierarchy) and the reporting entity's own assumptions about market participant assumptions (unobservable inputs classified within level three of the hierarchy).

The estimated fair values of tangible and intangible assets and liabilities recorded in connection with business combinations are based on Level 3 inputs. We estimate fair values based on cash flow projections utilizing appropriate discount and/or capitalization rates and available market information.

We determine impairment in real estate investments and debt and preferred equity investments, including intangibles, utilizing cash flow projections that apply estimated revenue and expense growth rates, discount rates and capitalization rates, which are classified as Level 3 inputs. We determined the valuation allowance for loan losses based on Level 3 inputs. See Note 4, "Debt and Preferred Equity Investments."

We use the following methods and assumptions in estimating fair value disclosures for financial instruments:

•

Cash and cash equivalents, restricted cash, accounts receivable, accounts payable and accrued expenses, and other assets and liabilities: The carrying amount of cash and cash equivalents, restricted cash, accounts receivable, accounts payable and accrued expenses, and other assets and liabilities reported in our consolidated balance sheets approximates fair value due to the short-term nature of these instruments.

•

Debt and preferred equity investments:  The fair value of debt and preferred equity investments 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. See "Reserve for Possible Credit Losses" below regarding valuation allowances for loan losses.

•

Derivative instruments:  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.

•

Mortgage payable and other debt:  The fair value of borrowings is estimated by discounting the future cash flows using current interest rates at which similar borrowings could be made by us.

The methodologies used for measuring fair value have been categorized into three broad levels as follows:

- Level 1—Quoted prices in active markets for identical instruments.
  
  Level 2—Valuations based principally on other observable market parameters, including
  
  •
  
  Quoted prices in active markets for similar instruments,
  
  •
  
  Quoted prices in less active or inactive markets for identical or similar instruments,
  
  •
  
  Other observable inputs (such as interest rates, yield curves, volatilities, prepayment speeds, loss severities, credit risks and default rates), and
  
  •
  
  Market corroborated inputs (derived principally from or corroborated by observable market data).

- Level 3—Valuations based significantly on unobservable inputs.
  
  •
  
  Valuations based on third-party indications (broker quotes or counterparty quotes) which were, in turn, based significantly on unobservable inputs or were otherwise not supportable as Level 2 valuations.
  
  •
  
  Valuations based on internal models with significant unobservable inputs.

These levels form a hierarchy. We follow this hierarchy for our assets and liabilities measured at fair value on a recurring and nonrecurring basis. The classifications are based on the lowest level of input that is significant to the fair value measurement.

Concentrations of Credit Risk

Financial instruments that potentially subject us to concentrations of credit risk consist primarily of cash investments, preferred equity investments and accounts receivable. We place our cash investments in excess of insured amounts with high quality financial institutions. The collateral securing our debt and preferred equity investments is located in the New York Metropolitan area. See Note 4, "Debt and Preferred Equity Investments." We perform ongoing credit evaluations of our tenants and require most tenants to provide security deposits or letters of credit. Though these security deposits and letters of credit are insufficient to meet the total value of a tenant's lease obligation, they are a measure of good faith and a source of funds to offset the economic costs associated with lost rent and the costs associated with re-tenanting the space. Although the properties in our real estate portfolio are primarily located in Manhattan, we also have Suburban properties located in Westchester County and Connecticut. The tenants located in our buildings operate in various industries. Other than two tenants who accounted for approximately 5.0% and 3.2% of our annualized cash rent, no other tenant in the portfolio accounted for more than 2.9% of our annualized cash rent at December 31, 2012. Approximately 18%, 10%, 10%, 9% and 9% of our annualized cash rent was attributable to 1185 Avenue of the Americas, 919 Third Avenue, 750 Third Avenue, 810 Seventh Avenue and 1350 Avenue of the Americas, respectively, for the year ended December 31, 2012.

Accounting Standards Updates

In May 2011, the FASB issued updated guidance on fair value measurement which amends U.S. GAAP to conform to IFRS measurement and disclosure requirements. The amendments change the wording used to describe the requirements in U.S. GAAP for measuring fair value, changes certain fair value measurement principles and enhances disclosure requirements. This guidance was effective as of the first quarter of 2012 and its adoption did not have a material impact on our consolidated financial statements.

In December 2011, the FASB issued guidance that concluded when a parent ceases to have a controlling financial interest in a subsidiary that is in substance real estate as a result of default on the subsidiary's nonrecourse debt, the reporting entity must apply the accounting guidance for sales of real estate to determine whether it should derecognize the in substance real estate. The reporting entity is precluded from derecognizing the real estate until legal ownership has been transferred to the lender to satisfy the debt. The guidance is effective for calendar year-end public and nonpublic companies in 2013 and is to be applied on a prospective basis. Early adoption of the guidance is permitted. Adoption of this guidance is not expected to have a material impact on our consolidated financial statements.

In February 2013, the FASB issued guidance on the presentation and disclosure of reclassification adjustments out of accumulated other comprehensive income, or AOCI. The standard requires an entity to present information about significant items reclassified out of AOCI by component either on the face of the statement where net income is presented or as a separate disclosure in the notes to financial statements. The guidance is effective for calendar year-end public companies in 2013 beginning in the first quarter and is to be applied on a prospective basis. Early adoption of the guidance is permitted. Adoption of this guidance will not have a material impact on our consolidated financial statements.

Property Acquisitions

12 Months Ended

Dec. 31, 2012

Property Acquisitions

Property Acquisitions

3. Property Acquisitions

In September 2012, we acquired the aggregate 267,000 square foot (unaudited) office buildings located at 635 and 641 Sixth Avenue for $173.0 million.

In June 2012, we acquired a 215,000 square foot (unaudited) office building located at 304 Park Avenue South for $135.0 million. The property was acquired with approximately $102.0 million in cash and $33.0 million in units of limited partnership interest in the Operating Partnership.

The following summarizes our allocation of the purchase price of the assets acquired and liabilities assumed upon the closing of these 2012 acquisitions (amounts in thousands):

	635 and 641 Sixth Avenue		304 Park Avenue South

Land	$	69,848	$	54,189
Building		104,474		75,619
Above market lease value		—		2,824
Acquired in-place leases		7,727		8,265
Other assets, net of other liabilities		—		—

Assets acquired		182,049		140,897

Below market lease value		9,049		5,897

Liabilities assumed		9,049		5,897

Purchase price allocation	$	173,000	$	135,000

Net consideration funded by us at closing	$	173,000	$	135,000

Equity and/or debt investment held	$	—	$	—

Debt assumed	$	—	$	—

- Definition

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

+ References

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+ Details

Debt and Preferred Equity Investments

12 Months Ended

Dec. 31, 2012

Debt and Preferred Equity Investments

Debt and Preferred Equity Investments

4. Debt and Preferred Equity Investments

As of December 31, 2012 and 2011, we held the following debt and preferred equity investments, with an aggregate weighted average current yield of approximately 10.12% at December 31, 2012 (amounts in thousands):

Type	December 31, 2012 Senior Financing		December 31, 2012 Carrying Value, Net of Discounts		December 31, 2011 Carrying Value, Net of Discounts

Preferred equity⁽¹⁾	$	480,000	$	100,831	$	—		July 2014
Preferred equity		70,000		10,000		—		October 2014
Preferred equity⁽¹⁾⁽²⁾		57,087		19,136		—		April 2016
Preferred equity⁽¹⁾		926,260		210,918		—		July 2016
Debt investment⁽³⁾		—		—		8,725		—
Loan loss reserve⁽³⁾		—		—		(8,125	)	—

	$	1,533,347	$	340,885	$	600

(1): The difference between the pay and accrual rates is included as an addition to the principal balance outstanding.
(2): As of December 31, 2012, we are committed to fund an additional $6.5 million on this loan.
(3): Loan loss reserves are specifically allocated to investments. Our reserves reflect management's judgment of the probability and severity of losses based on Level 3 data. We cannot be certain that our judgment will prove to be correct and that reserves will be adequate over time to protect against potential future losses.

At December 31, 2012 and 2011, all debt and preferred equity investments, other than as noted above, were performing in accordance with the terms of the loan agreements.

- Definition

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

+ References

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-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27405-111563

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 3, 19, 20, 21, 22, 137
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Investment in Unconsolidated Joint Venture	12 Months Ended
Investment in Unconsolidated Joint Venture	Dec. 31, 2012
Investment in Unconsolidated Joint Venture
Investment in Unconsolidated Joint Venture	5. Investment in Unconsolidated Joint Venture In May 2005, we acquired a 1.4 million square foot, 50-story, Class A office tower located at One Court Square, Long Island City, New York, for approximately $471.0 million, inclusive of transfer taxes and transactional costs. One Court Square is 100% leased to the seller, Citibank N.A., under a 15-year net lease. On November 30, 2005, we sold a 70% joint venture interest in One Court Square to certain institutional funds advised by JPMorgan Investment Management, or the JPM Investors, for approximately $329.7 million, including the assumption of $220.5 million of the property's mortgage debt. The operating agreement of the Court Square Joint Venture required approvals from members on certain decisions including annual budgets, sale of the property, refinancing of the property's mortgage debt and material renovations to the property. In addition, the members each had the right to recommend the sale of the property, subject to the terms of the mortgage debt, and to dissolve the Court Square Joint Venture. We also provided a detailed monthly reporting package to the JPM Investors. We had concluded that the JPM Investors had substantive participating rights in the ordinary course of the Court Square Joint Venture's business that result in shared power of the activities that most significantly impact the performance of the joint venture. We accounted for the Court Square Joint Venture under the equity method of accounting. In November 2011, we, along with our joint venture partner, reached an agreement to sell One Court Square to a private investor group for approximately $475.6 million. In November 2011, we recorded a $5.8 million impairment charge in connection with the expected sale of this investment. In July 2012, the property was sold for $481.1 million, which included the assumption of $315.0 million of existing debt by the purchaser. We recognized a gain of $1.0 million on sale of this property.

- Definition

The entire disclosure for equity method investments and joint ventures. Equity method investments are investments that give the investor the ability to exercise significant influence over the operating and financial policies of an investee. Joint ventures are entities owned and operated by a small group of businesses as a separate and specific business or project for the mutual benefit of the members of the group.

+ References + Details

Mortgage Note and Other Loans Payable

12 Months Ended

Dec. 31, 2012

Mortgage Note and Other Loans Payable

Mortgage Note and Other Loans Payable

6. Mortgage Note and Other Loans Payable

The first mortgage note and other loans payable collateralized by the property, assignment of leases and investment at December 31, 2012 and 2011, respectively, were as follows (amounts in thousands):

Property				December 31, 2012		December 31, 2011

609 Partners, LLC⁽²⁾	5.00	%	7/2014	$	23	$	31,721
Other loan payable⁽³⁾	8.00	%	9/2019		50,000		—
919 Third Avenue New York, NY⁽⁴⁾	5.12	%	6/2023		500,000		500,000
609 Fifth Avenue⁽⁵⁾	—		—		—		94,963
673 First Avenue⁽⁶⁾	—		—		—		29,906
110 East 42^nd Street⁽⁷⁾	—		—		—		65,000

				$	550,023	$	721,590

(1): Effective weighted average interest rate for the year ended December 31, 2012.
(2): As part of an acquisition, the Operating Partnership issued 63.9 million units of its 5.0% Series E preferred units, or the Series E units, with a liquidation of $1.00 per unit. As of December 31, 2012, 63.8 million Series E units had been redeemed.
(3): This loan is secured by a portion of a preferred equity investment.
(4): We own a 51% controlling interest in the joint venture that is the borrower on this loan. This loan is non-recourse to us. In June 2011, our joint venture replaced the $219.6 million 6.87% mortgage that was due to mature in August 2011 with a $500.0 million mortgage.
(5): In December 2012, we repaid the $93.3 million loan, which bore interest at a fixed of 5.85% per annum and was scheduled to mature in October 2013. We recognized a loss from early extinguishment of debt of approximately $3.1 million consisting mainly of prepayment penalty.
(6): In November 2012, we repaid the $29.1 million mortgage loan, which bore interest at a fixed rate of 5.67% per annum and was scheduled to mature in February 2013. There was no prepayment penalty
(7): Prior to transfer of this property to us, the Operating Partnership took control of this property in May 2011 and assumed the mortgage as part of the transaction. This loan consists of a $65.0 million A-tranche and an $18.1 million B-tranche which was owed to us. The B-tranche does not accrue interest and is due only under certain circumstances as described in the loan agreement. In December 2012, we repaid the $65.0 million mortgage loan, which bore interest at a fixed rate of 5.81% per annum and was scheduled to mature in July 2017. There was no prepayment penalty.

At December 31, 2012, the gross book value of the property and investment collateralizing the mortgage note and other loans payable was approximately $1.3 billion.

Corporate Indebtedness

12 Months Ended

Dec. 31, 2012

Corporate Indebtedness

Corporate Indebtedness

7. Corporate Indebtedness

2012 Credit Facility

In November 2012, we entered into a $1.6 billion credit facility, or the 2012 credit facility, which refinanced, extended and upsized the previous 2011 revolving credit facility. The 2012 credit facility consists of a $1.2 billion revolving credit facility, or the revolving credit facility, and a $400.0 million term loan, or the term loan facility. The revolving credit facility matures in March 2017 and includes two six-month extension options, subject to certain conditions and the payment of an extension fee of 10 basis points for each such extension. We also have an option, subject to customary conditions, without the consent of existing lenders, to increase the capacity under the revolving credit facility to $1.5 billion at any time prior to the maturity date for the revolving credit facility, by obtaining additional commitments from our current lenders and other financial institutions. The term loan facility matures on March 30, 2018.

The 2012 credit facility bears interest at a spread over LIBOR ranging from (i) 100 basis points to 175 basis points for loans under the revolving credit facility and (ii) 115 basis points to 200 basis points for loans under the term loan facility, in each case based on the credit rating assigned to our senior unsecured long term indebtedness. At December 31, 2012, the applicable spread was 145 basis points for revolving credit facility and 165 basis points for the term loan facility. We are required to pay quarterly in arrears a 15 to 35 basis point fee on the unused balance of the commitments under the revolving credit facility. As of December 31, 2012, the facility fee was 30 basis points. At December 31, 2012, we had approximately $79.5 million of outstanding letters of credit, $70.0 million drawn under the revolving credit facility and $400.0 million outstanding under the term loan facility, with total undrawn capacity of $1.1 billion under the 2012 credit facility.

We, SL Green and the Operating Partnership are all borrowers jointly and severally obligated under the 2012 credit facility. No other subsidiary of ours is an obligor under the 2012 credit facility.

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

2011 Revolving Credit Facility

The 2012 credit facility replaced our $1.5 billion revolving credit facility, or the 2011 revolving credit facility, which was terminated concurrently with the entering into the 2012 credit facility. The 2011 revolving credit facility bore interest at a spread over LIBOR ranging from 100 basis points to 185 basis points, based on the credit rating assigned to our senior unsecured long-term indebtedness, and required to pay quarterly in arrears a 17.5 to 45 basis point facility fee on the total commitments under the 2011 revolving credit facility. The 2011 revolving credit facility included certain restrictions and covenants and, as of the time of the termination of the 2011 revolving credit facility and as of November 2012, we were in compliance with all such restrictions and covenants.

Senior Unsecured Notes

The following table sets forth our senior unsecured notes and other related disclosures as of December 31, 2012 and 2011, respectively, by scheduled maturity date (amounts in thousands):

Issuance	December 31, 2012 Unpaid Principal Balance		December 31, 2012 Accreted Balance		December 31, 2011 Accreted Balance

August 13, 2004⁽²⁾	$	75,898	$	75,898	$	98,578	5.88	%	5.88	%	10	August 15, 2014
March 31, 2006⁽²⁾		255,308		255,165		274,804	6.00	%	6.02	%	10	March 31, 2016
August 5, 2011⁽³⁾		250,000		249,620		249,565	5.00	%	5.03	%	7	August 15, 2018
March 16, 2010⁽³⁾		250,000		250,000		250,000	7.75	%	7.75	%	10	March 15, 2020
November 15, 2012⁽³⁾		200,000		200,000		—	4.50	%	4.50	%	10	December 1, 2022
June 27, 2005⁽⁴⁾		7		7		657	4.00	%	4.00	%	20	June 15, 2025

	$	1,031,213	$	1,030,690	$	873,604

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

(2): On December 27, 2012, we repurchased $42.4 million aggregate principal amount of these notes, consisting of $22.7 million of the 5.875% Notes and $19.7 million of the 6.0% Notes, for a total consideration of $46.4 million and realized a net loss on early extinguishment of debt of approximately $3.8 million.
(3): We, SL Green and the Operating Partnership are co-obligors.
(4): Exchangeable senior debentures which are currently callable at par. In addition, the debentures can be put to us, at the option of the holder at par plus accrued and unpaid interest, on June 15, 2015 and 2020 and upon the occurrence of certain change of control transactions. As a result of the Merger, the adjusted exchange rate for the debentures is 7.7461 shares of SL Green's common stock per $1,000 of principal amount of debentures and the adjusted reference dividend for the debentures is $1.3491. During the year ended December 31, 2012, we repurchased $650,000 of these bonds at par.

ROP also provides a guaranty of the Operating Partnership's obligations under its 3.00% Exchangeable Senior Notes due 2017.

Restrictive Covenants

The terms of the 2012 credit facility and certain of our senior unsecured notes include certain restrictions and covenants which may limit, among other things, SL Green's 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 minimum amount of tangible net worth, a 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 SL Green will not during any time when a default is continuing, make distributions with respect to SL Green's common stock or other equity interests, except to enable SL Green to continue to qualify as a REIT for Federal income tax purposes. As of December 31, 2012 and 2011, we were in compliance with all such covenants.

Principal Maturities

Combined aggregate principal maturities of mortgage and other loans payable, 2012 credit facility and senior unsecured notes as of December 31, 2012, including as-of-right extension options, were as follows (amounts in thousands):

	Scheduled Amortization		Principal Repayments		Revolving Credit Facility		Term loan and Senior Unsecured Notes		Total

2013	$	—	$	—	$	—	$	—	$	—
2014		—		23		—		75,898		75,921
2015		—		—		—		7		7
2016		4,116		—		—		255,165		259,281
2017		7,056		—		—		—		7,056
Thereafter		38,220		500,608		70,000		1,099,620		1,708,448

	$	49,392	$	500,631	$	70,000	$	1,430,690	$	2,050,713

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

	Years Ended December 31,

	2012			2011			2010
				As Adjusted			As Adjusted
Interest expense	$	108,634		$	82,516		$	70,965
Interest income		(68	)		(94	)		(138	)

Interest expense, net	$	108,566		$	82,422		$	70,827

Interest capitalized	$	—		$	—		$	—

- 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 + Details

Fair Value of Financial Instruments	12 Months Ended
Fair Value of Financial Instruments	Dec. 31, 2012
Fair Value of Financial Instruments
Fair Value of Financial Instruments	8. Fair Value of Financial Instruments The following disclosures of estimated fair value were determined by management, using available market information and appropriate valuation methodologies, as discussed in Note 2, "Significant Accounting Policies." Considerable judgment is necessary to interpret market data and develop estimated fair value. Accordingly, the estimates presented herein are not necessarily indicative of the amounts we could realize on disposition of the financial instruments. The use of different market assumptions and/or estimation methodologies may have a material effect on the estimated fair value amounts. Cash and cash equivalents, restricted cash, accounts receivable and accounts payable balances reasonably approximate their fair values due to the short maturities of these items. Mortgage note and other loans payable and the senior unsecured notes had an estimated fair value based on discounted cash flow models, based on Level 3 inputs, of approximately $1.8 billion, compared to the book value of the related fixed rate debt of approximately $1.6 billion at December 31, 2012. Our floating rate debt, inclusive of our 2012 credit facility, but excluding $30.0 million of which was swapped, had an estimated fair value based on discounted cash flow models, based on Level 3 inputs, of approximately $435.2 million, compared to the book value of related floating rate debt of approximately $440.0 million at December 31, 2012. Our preferred equity investments had an estimated fair value ranging between $300.0 million and $400.0 million, compared to the book value of related preferred equity investments of approximately $340.9 million at December 31, 2012 based on Level 3 inputs. Disclosure about fair value of financial instruments is based on pertinent information available to us as of December 31, 2012. Although we are not aware of any factors that would significantly affect the reasonable fair value amounts, such amounts have not been comprehensively revalued for purposes of these financial statements since that date and current estimates of fair value may differ significantly from the amounts presented herein.

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 30
-URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13537-108611

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14064-108612

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 16
-URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13504-108611

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13433-108611

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 15B
-Subparagraph a, b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 44A, 44B
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 159
-Paragraph 17-22, 27, 28
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 15A
-Subparagraph a-d
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 15C, 15D
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 157
-Paragraph 32, 33, 34
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 3, 10, 14, 15
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Rental Income

12 Months Ended

Dec. 31, 2012

Rental Income

Rental Income

9. Rental Income

We are the lessor and the sublessor to tenants under operating leases with expiration dates ranging from January 1, 2013 to 2030. The minimum rental amounts due under the leases are generally either 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. Approximate future minimum rents to be received over the next five years and thereafter for non-cancelable operating leases in effect at December 31, 2012 for the consolidated properties, including consolidated joint venture properties, are as follows (amounts in thousands):

Year	Consolidated Properties

2013	$	415,979
2014		400,077
2015		384,182
2016		358,766
2017		323,224
Thereafter		1,510,576

	$	3,392,804

- Definition

The entire disclosure for operating leases of a lessor. This may include a general description of lessor's leasing arrangements for operating leases, including the basis on which contingent rental payments are determined, the existence and terms of renewal or purchase options and escalation clauses, restrictions imposed by lease arrangements, such as those concerning dividends, additional debt, and further leasing, rent holidays, rent concessions, or leasehold improvement incentives and unusual provisions or conditions.

+ References + Details

Related Party Transactions	12 Months Ended
Related Party Transactions	Dec. 31, 2012
Related Party Transactions
Related Party Transactions	10. Related Party Transactions Cleaning/ Security/ Messenger and Restoration Services Through Alliance Building Services, or Alliance, First Quality Maintenance, L.P., or First Quality, provides cleaning, extermination and related services, Classic Security LLC provides security services, Bright Star Couriers LLC provides messenger services, and Onyx Restoration Works provides restoration services with respect to certain properties owned by us. Alliance is partially owned by Gary Green, a son of Stephen L. Green, the chairman of SL Green's board of directors. 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. An affiliate of ours 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. Alliance paid the affiliate approximately $3.4 million, $2.3 million and $1.8 million for the years ended December 31, 2012, 2011 and 2010, respectively. We paid Alliance approximately $5.3 million, $4.7 million and $6.0 million for the years ended December 31, 2012, 2011 and 2010, respectively, for these services (excluding services provided directly to tenants). Allocated Expenses from SL Green Property operating expenses include an allocation of salary and other operating costs from SL Green based on square footage of the related properties. Such amount was approximately $7.0 million, $6.3 million and $6.0 million for the years ended December 31, 2012, 2011 and 2010, respectively. Insurance We obtained insurance coverage through an insurance program administered by SL Green. In connection with this program we incurred insurance expense of approximately $4.7 million, $4.5 million and $5.3 million for the years ended December 31, 2012, 2011 and 2010, respectively.

- 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/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39603-107864

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
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-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39678-107864

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(k))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39691-107864

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph b
-Article 3A

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Paragraph k
-Article 4

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 57
-Paragraph 1-4
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Capital	12 Months Ended
Capital	Dec. 31, 2012
Capital
Capital	11. Capital Since consummation of the Merger on January 25, 2007, the Operating Partnership has owned all the economic interests in ROP either by direct ownership or by indirect ownership through our general partner, which is its wholly-owned subsidiary. Intercompany transactions between SL Green and ROP are generally recorded as contributions and distributions.

- Definition

The entire disclosure for the formation, structure, control and ownership of the partnership. Disclosures related to accounts comprising partners' capital. Includes balances of general partners' capital account, limited partners' capital account, preferred partners' capital account and total partners' capital account and units outstanding; accumulated other comprehensive income; amount and nature of changes to amount of partner's capital and units outstanding by class, rights and privileges for each class of units; distribution policies and distributions paid by unit class; impact of and correction of an error in previously issued financial statements; limitations of partners' liability; redemption, conversion and distribution policies; and deferred compensation related to the issuance of units.

+ References + Details

Benefit Plans

12 Months Ended

Dec. 31, 2012

Benefit Plans

Benefit Plans

12. Benefit Plans

The building employees are covered by multi-employer defined benefit pension plans and post-retirement health and welfare plans. We participate in the Building Service 32BJ, or Union, Pension Plan and Health Plan. The Pension Plan is a multi-employer, non-contributory defined benefit pension plan that was established under the terms of collective bargaining agreements between the Service Employees International Union, Local 32BJ, the Realty Advisory Board on Labor Relations, Inc. and certain other employees. This Pension Plan is administered by a joint board of trustees consisting of union trustees and employer trustees and operates under employer identification number 13-1879376. The Pension Plan year runs from July 1 to June 30. Employers contribute to the Pension Plan at a fixed rate on behalf of each covered employee. Separate actuarial information regarding such pension plans is not made available to the contributing employers by the union administrators or trustees, since the plans do not maintain separate records for each reporting unit. However, on September 28, 2011 and September 28, 2012, the actuary certified that for the plan years beginning July 1, 2011 and July 1, 2012, respectively, the Pension Plan was in critical status under the Pension Protection Act of 2006. The Pension Plan trustees adopted a rehabilitation plan consistent with this requirement. No surcharges have been paid to the Pension Plan as of December 31, 2012. For the years ended December 31, 2012, 2011 and 2010, the Pension Plan received contributions from employers totaling $212.7 million, $201.3 million and $193.3 million, respectively.

The Health Plan was established under the terms of collective bargaining agreements between the Union, the Realty Advisory Board on Labor Relations, Inc. and certain other employers. The Health Plan provides health and other benefits to eligible participants employed in the building service industry who are covered under collective bargaining agreements, or other written agreements, with the Union. The Health Plan is administered by a Board of Trustees with equal representation by the employers and the Union and operates under employer identification number 13-2928869. The Health Plan receives contributions in accordance with collective bargaining agreements or participation agreements. Generally, these agreements provide that the employers contribute to the Health Plan at a fixed rate on behalf of each covered employee. Pursuant to the contribution diversion provision in the collective bargaining agreements, the collective bargaining parties agreed, beginning January 1, 2009, to divert to the Pension Plan $1.95 million of employer contributions per quarter that would have been due to the Health Plan. Effective October 1, 2010, the diversion of contributions was discontinued. For the years ended December 31, 2012, 2011 and 2010, the Health Plan received contributions from employers totaling $893.3 million, $843.2 million and $770.8 million, respectively.

Contributions we made to the multi-employer plans for the years ended December 31, 2012, 2011 and 2010 are included in the table below (amounts in thousands):

	Years Ended December 31,

Benefit Plan	2012		2011		2010
			As Adjusted		As Adjusted
Pension Plan	$	1,004	$	975	$	828
Health Plan		3,165		2,933		2,650
Other plans		2,431		2,465		2,260

Total plan contributions	$	6,600	$	6,373	$	5,738

- Definition

The entire disclosure for pension and other postretirement benefits.

+ References

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+ Details

Commitments and Contingencies

12 Months Ended

Dec. 31, 2012

Commitments and Contingencies

Commitments and Contingencies

13. Commitments and Contingencies

We are not presently involved in any material litigation nor, to our knowledge, any material litigation threatened against us or our properties, other than routine litigation arising in the ordinary course of business. Management believes the costs, if any, incurred by us related to this litigation will not materially affect our financial position, operating results or liquidity.

The property located at 1185 Avenue of the Americas operates under a ground lease (approximately $6.9 million annually) with a term expiration of 2020 and with an option to renew for an additional 23 years.

The property located at 461 Fifth Avenue operates under a ground lease (approximately $2.1 million annually) with a term expiration date of 2027 and with two options to renew for an additional 21 years each, followed by a third option for 15 years. We also have an option to purchase the ground lease for a fixed price on a specific date.

The property located at 673 First Avenue, which was transferred to ROP at December 31, 2012, has been capitalized for financial statement purposes. Land was estimated to be approximately 70% of the fair market value of the property. The portion of the lease attributed to land was classified as an operating lease and the remainder as a capital lease. The initial lease term was 49 years with an option for an additional 25 years. In November 2012, the lease was extended to August 2087, an additional 50 years past its scheduled 2037 expiration date, with an effective date of September 2012. We continue to lease the property located at 673 First Avenue, which has been classified as a capital lease with a cost basis of $12.2 million and cumulative amortization of $6.3 million and $6.0 million at December 31, 2012 and 2011, respectively.

The following is a schedule of future minimum lease payments under capital lease and non-cancellable operating leases with initial terms in excess of one year as of December 31, 2012 (amounts in thousands):

December 31,	Capital lease			Non-cancellable operating leases

2013	$	1,555		$	17,274
2014		1,555			17,274
2015		1,593			17,500
2016		1,707			17,954
2017		1,707			17,954
Thereafter		40,644			1,231,425

Total minimum lease payments		48,761		$	1,319,381

Less amount representing interest		(31,575	)

Present value of net minimum lease payment	$	17,186

- Definition

The entire disclosure for commitments and contingencies.

+ References

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Reference 7: http://www.xbrl.org/2003/role/presentationRef
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+ Details

Environmental Matters	12 Months Ended
Environmental Matters	Dec. 31, 2012
Environmental Matters
Environmental Matters	14. 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 the properties were sold.

- Definition

The entire disclosure for environmental loss contingencies, such as presence of hazardous waste, relevant information from reports issued by regulators, and estimated costs to achieve compliance with regulatory requirements. This element may be used for all of an entity's disclosures about environmental loss contingencies.

+ References + Details

Segment Information

12 Months Ended

Dec. 31, 2012

Segment Information

Segment Information

15. Segment Information

We are engaged in acquiring, owning, managing and leasing commercial office properties in Manhattan, Westchester County and Connecticut and have two reportable segments, real estate and debt and preferred equity investments. We evaluate real estate performance and allocate resources based on earnings contribution to income from continuing operations.

Our real estate portfolio is primarily located in the geographical markets of Manhattan, Westchester County and Connecticut. The primary sources of revenue are generated from tenant rents and escalations and reimbursement revenue. Real estate property operating expenses consist primarily of security, maintenance, utility costs, real estate taxes and ground rent expense (at certain applicable properties). See Note 4, "Debt and Preferred Equity Investments," for additional details on our debt and preferred equity investments.

Selected results of operations for the years ended December 31, 2012, 2011 and 2010 and selected asset information as of December 31, 2012 and 2011, regarding our operating segments are as follows (amounts in thousands):

	Real Estate Segment		Debt and Preferred Equity Segment		Total Company

Total revenues:
Year ended December 31, 2012	$	519,312	$	9,497	$	528,809
Year ended December 31, 2011, As Adjusted		498,480		3,077		501,557
Year ended December 31, 2010, As Adjusted		488,904		1,231		490,135
Income from continuing operations:
Year ended December 31, 2012	$	30,646	$	8,360	$	39,006
Year ended December 31, 2011, As Adjusted		59,438		5,440		64,878
Year ended December 31, 2010, As Adjusted		83,707		901		84,608
Total assets
As of:
December 31, 2012	$	5,057,563	$	340,999	$	5,398,562
December 31, 2011		4,855,798		600		4,856,398

Income from continuing operations represents total revenues less total expenses for the real estate segment and total investment income less allocated interest expense and provision for loan losses for the debt and preferred equity segment. Interest costs for the debt and preferred equity segment are imputed assuming 100% leverage at our 2012 credit facility borrowing cost. We also allocate loan loss reserves, net of recoveries to the debt and preferred equity segment. We do not allocate marketing, general and administrative expenses and transaction related costs to the debt and preferred equity segment, since we base performance on the individual segments prior to allocating marketing, general and administrative expenses. All other expenses, except interest, relate entirely to the real estate assets. There were no transactions between the above two segments.

The table below reconciles income from continuing operations to net income attributable to common unitholder for the years ended December 31, 2012, 2011 and 2010 (amounts in thousands):

	Years Ended December 31,

	2012			2011			2010
				As Adjusted			As Adjusted
Income from continuing operations	$	39,006		$	64,878		$	84,608
Net loss from discontinued operations		—			—			—

Net income		39,006			64,878			84,608
Net income attributable to noncontrolling interests in other partnerships		(6,013	)		(9,886	)		(13,682	)

Net income attributable to ROP common unitholder	$	32,993		$	54,992		$	70,926

- 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

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+ Details

Financial Instruments: Derivatives and Hedging

12 Months Ended

Dec. 31, 2012

Financial Instruments: Derivatives and Hedging

Financial Instruments: Derivatives and Hedging

16. Financial Instruments: Derivatives and Hedging

We recognize all derivatives on the balance sheet at fair value. Derivatives that are not hedges must be 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 hedged asset, liability, or firm commitment through earnings, or recognized in other comprehensive income until the hedged item is recognized in earnings. The ineffective portion of a derivative's change in fair value will be immediately recognized in earnings. Reported net income and capital 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.

Accumulated other comprehensive loss at December 31, 2012 consists of approximately $3.1 million from the settlement of hedges, which are being amortized over the remaining term of the related senior unsecured notes. Currently, all of our designated derivative instruments are effective hedging instruments.

Over time, the realized and unrealized gains and losses held in accumulated other comprehensive loss will be reclassified into earnings as an adjustment to interest expense in the same periods in which the hedged interest payments affect earnings. We estimate that approximately $0.4 million of the current balance held in accumulated other comprehensive loss will be reclassified into earnings within the next 12 months.

The following table presents the effect of our derivative financial instruments on the consolidated statements of income and comprehensive income as of December 31, 2012, 2011 and 2010 (amounts in thousands):

		Amount of Loss Recognized in Other Comprehensive Loss (Effective Portion) For the Year Ended December 31,								Amount of Loss Reclassified from Accumulated Other Comprehensive Loss into Interest Expense (Effective Portion) For the Year Ended December 31,								Amount of Loss Recognized in Interest Expense (Ineffective Portion) For the Year Ended December 31,

Designation\Cash Flow	Derivative	2012			2011			2010		2012			2011			2010		2012			2011			2010
Qualifying	Interest Rate Swaps/Caps	$	(794	)	$	(5,924	)		—	$	(986	)	$	(807	)		—	$	(3	)	$	(16	)		—
Non-qualifying	Interest Rate Caps/Currency Hedges		—			—			—		—			—			—		—			—			—

- Definition

The entire disclosure for the entity's entire derivative instruments and hedging activities. Describes an entity's risk management strategies, derivatives in hedging activities and non-hedging derivative instruments, the assets, obligations, liabilities, revenues and expenses arising therefrom, and the amounts of and methodologies and assumptions used in determining the amounts of such items.

+ References

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Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4J
-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5708773-113959

Reference 15: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5618551-113959

Reference 16: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5580258-113959

Reference 17: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=7476318&loc=d3e41638-113959

Reference 18: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 25
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986

Reference 19: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4E
-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624181-113959

Reference 20: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(n))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

Reference 21: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 45
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 22: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 44
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Supplemental Disclosure of Non-Cash Investing and Financing Activities

12 Months Ended

Dec. 31, 2012

Supplemental Disclosure of Non-Cash Investing and Financing Activities

Supplemental Disclosure of Non-Cash Investing and Financing Activities

17. Supplemental Disclosure of Non-Cash Investing and Financing Activities

The following table provides information on non-cash investing and financing activities (amounts in thousands):

	Years ended December 31,

	2012		2011
Tenant improvements and capital expenditures payable	$	619	$	2,646
Deferred leasing payable		1,332		1,813
Change in fair value of hedge		192		1,716
Transfer of treasury lock hedge		—		3,591
Contributions from common unitholder		33,090		—
Transfer of commercial real estate property, net		—		77,667
Transfer of preferred equity investments		324,858		15,697
Transfer of mortgage note and other loans payable		50,023		65,000
Redemption of Series E units		31,698		—

Quarterly Financial Data (unaudited)

12 Months Ended

Dec. 31, 2012

Quarterly Financial Data (unaudited)

Quarterly Financial Data (unaudited)

18. Quarterly Financial Data (unaudited)

The quarterly results of operations of the Company for the years ended December 31, 2012 and 2011, which have been updated to reflect the properties transferred to us by SL Green, are as follows (amounts in thousands):

2012 Quarter Ended	December 31			September 30			June 30			March 31

				As Adjusted			As Adjusted			As Adjusted
Total revenues	$	142,917		$	131,584		$	127,476		$	126,832

Income from continuing operations before loss on extinguishment of debt, equity in net loss (gain) on sale of interest in unconsolidated joint venture, equity in net income from unconsolidated joint venture and noncontrolling interests	$	12,917		$	11,282		$	11,006		$	8,738
Loss on extinguishment of debt		(6,904	)		—			—			—
Equity in net loss (gain) on sale of interest in unconsolidated joint venture		(10	)		(4,778	)		5,789			—
Equity in net income from unconsolidated joint venture		(3	)		183			660			126

Net income		6,000			6,687			17,455			8,864
Net income attributable to noncontrolling interests in other partnerships		(1,385	)		(1,188	)		(2,067	)		(1,373	)

Net income attributable to ROP common unitholder	$	4,615		$	5,499		$	15,388		$	7,491

2011 Quarter Ended	December 31			September 30			June 30			March 31

	As Adjusted			As Adjusted			As Adjusted			As Adjusted
Total revenues	$	125,657		$	123,289		$	123,557		$	129,054

Income from continuing operations before depreciable real estate reserves, equity in net income from unconsolidated joint venture and noncontrolling interests	$	10,469		$	11,520		$	19,318		$	28,863
Depreciable real estate reserves		(5,789	)		—			—			—
Equity in net income from unconsolidated joint venture		99			119			133			146

Net income		4,779			11,639			19,451			29,009
Net income attributable to noncontrolling interests in other partnerships		(1,504	)		(1,653	)		(3,176	)		(3,553	)

Net income attributable to ROP common unitholder	$	3,275		$	9,986		$	16,275		$	25,456

- Definition

The entire disclosure for the quarterly financial data in the annual financial statements. The disclosure may include a tabular presentation of financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income or loss before extraordinary items and earnings per share data. It also includes an indication if the information in the note is unaudited, comments on the aggregate effect of year-end adjustments, and an explanation of matters or transactions that affect comparability or are pertinent to an understanding of the information furnished.

+ References + Details

Schedule II-Valuation and Qualifying Accounts

12 Months Ended

Dec. 31, 2012

Schedule II-Valuation and Qualifying Accounts

Schedule II-Valuation and Qualifying Accounts

Schedule II—Valuation and Qualifying Accounts
December 31, 2012
(Dollars in thousands)

Column A	Column B		Column C		Column D			Column E

Description	Balance at Beginning of Year		Additions Charged Against Operations		Uncollectible Accounts Written-off			Balance at End of Year
Year Ended December 31, 2012
Tenant and other receivables—allowance	$	4,667		2,805		(164	)	$	7,308
Deferred rent receivable—allowance		15,942		1,131		(572	)		16,501
Year Ended December 31, 2011, As Adjusted
Tenant and other receivables—allowance	$	5,074		632		(1,039	)	$	4,667
Deferred rent receivable—allowance		13,002		3,290		(350	)		15,942
Year Ended December 31, 2010, As Adjusted
Tenant and other receivables—allowance	$	4,440		1,522		(888	)	$	5,074
Deferred rent receivable—allowance		10,872		2,719		(589	)		13,002

Schedule III-Real Estate And Accumulated Depreciation

12 Months Ended

Dec. 31, 2012

Schedule III-Real Estate And Accumulated Depreciation

Schedule III-Real Estate And Accumulated Depreciation

Schedule III—Real Estate And Accumulated Depreciation
December 31, 2012
(Dollars in thousands)

Column A	Column B		Column C Initial Cost				Column D Cost Capitalized Subsequent To Acquisition						Column E Gross Amount at Which Carried at Close of Period						Column F		Column G		Column H		Column I

Description	Encumbrances		Land		Building & Improvements		Land			Building & Improvements			Land		Building & Improvements		Total		Accumulated Depreciation		Date of Construction		Date Acquired		Life on Which Depreciation is Computed
810 Seventh Avenue⁽¹⁾	$	—	$	114,077	$	476,386	$	—		$	39,315		$	114,077	$	515,701	$	629,778	$	83,226		1970		1/2007		Various
461 Fifth Avenue⁽¹⁾⁽⁶⁾		—		—		62,695		—			6,738			—		69,433		69,433		17,444		1988		10/2003		Various
750 Third Avenue⁽¹⁾⁽⁶⁾		—		51,093		205,972		—			30,120			51,093		236,092		287,185		54,689		1958		7/2004		Various
919 Third Avenue⁽¹⁾⁽⁴⁾		500,000		223,529		1,033,198		—			8,084			223,529		1,041,282		1,264,811		160,004		1970		1/2007		Various
333 West 34^th Street⁽¹⁾⁽⁶⁾		—		36,711		146,880		—			22,507			36,711		169,387		206,098		24,308		1954		6/2007		Various
555 W. 57^th Street⁽¹⁾⁽⁶⁾		—		18,846		78,704		—			37,612			18,846		116,316		135,162		40,143		1971		1/1999		Various
1185 Avenue of the Americas⁽¹⁾		—		—		728,213		—			30,143			—		758,356		758,356		129,505		1969		1/2007		Various
1350 Avenue of the Americas⁽¹⁾		—		91,038		380,744		—			22,694			91,038		403,438		494,476		66,036		1966		1/2007		Various
1100 King Street—1-7 International Drive⁽²⁾		—		49,392		104,376		2,473			8,795			51,865		113,171		165,036		21,597		1983/1986		1/2007		Various
520 White Plains Road⁽²⁾		—		6,324		26,096		—			2,593			6,324		28,689		35,013		5,545		1979		1/2007		Various
115-117 Stevens Avenue⁽²⁾		—		5,933		23,826		—			5,177			5,933		29,003		34,936		5,703		1984		1/2007		Various
100 Summit Lake Drive⁽²⁾		—		10,526		43,109		—			6,762			10,526		49,871		60,397		8,464		1988		1/2007		Various
200 Summit Lake Drive⁽²⁾		—		11,183		47,906		—			3,263			11,183		51,169		62,352		8,847		1990		1/2007		Various
500 Summit Lake Drive⁽²⁾		—		9,777		39,048		—			4,183			9,777		43,231		53,008		6,701		1986		1/2007		Various
140 Grand Street⁽²⁾		—		6,865		28,264		—			3,557			6,865		31,821		38,686		5,503		1991		1/2007		Various
360 Hamilton Avenue⁽²⁾		—		29,497		118,250		—			10,549			29,497		128,799		158,296		21,318		2000		1/2007		Various
7 Landmark Square⁽³⁾		—		2,088		7,748		(367	)		(153	)		1,721		7,595		9,316		209		2007		1/2007		Various
680 Washington Boulevard⁽³⁾⁽⁴⁾		—		11,696		45,364		—			4,031			11,696		49,395		61,091		8,040		1989		1/2007		Various
750 Washington Boulevard⁽³⁾⁽⁴⁾		—		16,916		68,849		—			3,995			16,916		72,844		89,760		11,962		1989		1/2007		Various
1010 Washington Boulevard⁽³⁾⁽⁶⁾		—		7,747		30,423		—			3,354			7,747		33,777		41,524		5,447		1988		6/2007		Various
1055 Washington Boulevard⁽³⁾		—		13,516		53,228		—			2,524			13,516		55,752		69,268		9,008		1987		1/2007		Various
400 Summit Lake Drive⁽²⁾		—		38,889		—		285			1			39,174		1		39,175		—		—		1/2007		Various
673 First Avenue⁽¹⁾⁽⁶⁾		—		—		35,727		—			12,008			—		47,735		47,735		18,538		1928		8/1997		Various
609 Fifth Avenue⁽¹⁾⁽⁶⁾		—		36,677		145,954		—			4,640			36,677		150,594		187,271		24,420		1925		6/2006		Various
110 East 42^nd Street⁽¹⁾⁽⁶⁾		—		34,000		46,411		—			4,214			34,000		50,625		84,625		3,424		1921		5/2011		Various
304 Park Avenue⁽¹⁾		—		54,189		75,619		300			1,109			54,489		76,728		131,217		1,715		1930		6/2012		Various
635 Sixth Avenue⁽¹⁾		—		24,179		37,158		164			803			24,343		37,961		62,304		234		1902		9/2012		Various
641 Sixth Avenue⁽¹⁾		—		45,668		67,316		308			430			45,976		67,746		113,722		629		1902		9/2012		Various
Other⁽⁵⁾		—		1,128		—		84			4,692			1,212		4,692		5,904		—		—		—		Various

	$	500,000	$	951,484	$	4,157,464	$	3,247		$	283,740		$	954,731	$	4,441,204	$	5,395,935	$	742,659

(1): Property located in New York, New York.
(2): Property located in Westchester County, New York.
(3): Property located in Connecticut.
(4): We own a 51% interest in this property.
(5): Other includes tenant improvements, capitalized interest and corporate improvements.
(6): Properties that were transferred in.

The changes in real estate for the years ended December 31, 2012, 2011 and 2010 are as follows:

	2012			2011			2010

				As Adjusted			As Adjusted
Balance at beginning of year	$	5,048,410		$	4,918,508		$	4,873,816
Acquisitions		306,280			80,411			—
Improvements		42,467			54,065			44,891
Retirements/disposals		(1,222	)		(4,574	)		(199	)

Balance at end of year	$	5,395,935		$	5,048,410		$	4,918,508

The aggregate cost of land, buildings and improvements, before depreciation, for Federal income tax purposes at December 31, 2012 was approximately $3.1 billion.

The changes in accumulated depreciation, exclusive of amounts relating to equipment, autos, and furniture and fixtures, for the years ended December 31, 2012, 2011 and 2010 are as follows:

	2012			2011			2010

				As Adjusted			As Adjusted
Balance at beginning of year	$	613,543		$	493,557		$	375,228
Depreciation for year		130,333			124,010			118,500
Retirements/disposals		(1,217	)		(4,024	)		(171	)

Balance at end of year	$	742,659		$	613,543		$	493,557

- Definition

The entire disclosure for real estate and accumulated depreciation. This may include a schedule that describes the property and lists the initial cost of land, buildings and improvements, improvements and carrying costs capitalized after acquisition, and the total carrying cost for land, buildings and improvements for each property and in aggregate. The schedule also lists the accumulated depreciation for each property and in aggregate, the date each property was constructed and acquired, the useful life used to calculate depreciation and any encumbrances on the properties. The entity provides a reconciliation of the carrying amount of real estate from the beginning of the period to the end of the period. Any real estate investments that have been written down or reserved against are described, including the basis of the write-down. A material amount of intercompany profit in the total carrying amount of real estate is disclosed. The aggregate cost of all real estate investments for federal income tax purposes is also disclosed.

+ References + Details

Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2012

Significant Accounting Policies

Principles of Consolidation

Principles of Consolidation

Investment in Commercial Real Estate Properties

Investment in Commercial Real Estate Properties

Properties are depreciated using the straight-line method over the estimated useful lives of the assets. The estimated useful lives are as follows:

Category		Term

Building (fee ownership)		40 years
Building improvements		shorter of remaining life of the building or useful life
Building (leasehold interest)		lesser of 40 years or remaining term of the lease
Property under capital lease		remaining lease term
Furniture and fixtures		four to seven years
Tenant improvements		shorter of remaining term of the lease or useful life

Results of operations of properties acquired are included in the consolidated statements of income and comprehensive income from the date of acquisition.

	December 31, 2012			December 31, 2011

Identified intangible assets (included in other assets):
Gross amount	$	199,845		$	181,028
Accumulated amortization		(125,009	)		(104,441	)

Net	$	74,836		$	76,587

Identified intangible liabilities (included in deferred revenue):
Gross amount	$	399,088		$	384,141
Accumulated amortization		(227,637	)		(190,995	)

Net	$	171,451		$	193,146


2013	$	11,419
2014		7,824
2015		6,362
2016		6,314
2017		6,290


2013	$	5,917
2014		4,651
2015		3,982
2016		2,832
2017		2,010

Investment in Unconsolidated Joint Ventures

Investment in Unconsolidated Joint Ventures

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

Deferred Lease Costs

Deferred Lease Costs

Deferred lease costs consist of fees and direct costs incurred to initiate and renew operating leases and are amortized on a straight-line basis over the related lease term.

Deferred Financing Costs

Deferred Financing Costs

Revenue Recognition

Revenue Recognition

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

Allowance for Doubtful Accounts

Allowance for Doubtful Accounts

Reserve for Possible Credit Losses

Reserve for Possible Credit Losses

Rent Expense

Rent Expense

Income Taxes

Income Taxes

No provision has been made for income taxes in the accompanying consolidated financial statements since such taxes, if any, are the responsibility of the individual partners.

Earnings per Unit

Earnings per Unit

Earnings per unit was not computed in 2012, 2011 and 2010 as there were no outstanding common units held by third parties at December 31, 2012, 2011 and 2010.

Use of Estimates

Use of Estimates

Exchangeable Debt Instruments

Exchangeable Debt Instruments

Derivative Instruments

Derivative Instruments

Fair Value Measurements

Fair Value Measurements

We use the following methods and assumptions in estimating fair value disclosures for financial instruments:

•

Cash and cash equivalents, restricted cash, accounts receivable, accounts payable and accrued expenses, and other assets and liabilities: The carrying amount of cash and cash equivalents, restricted cash, accounts receivable, accounts payable and accrued expenses, and other assets and liabilities reported in our consolidated balance sheets approximates fair value due to the short-term nature of these instruments.

•

Debt and preferred equity investments:  The fair value of debt and preferred equity investments 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. See "Reserve for Possible Credit Losses" below regarding valuation allowances for loan losses.

•

Derivative instruments:  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.

•

Mortgage payable and other debt:  The fair value of borrowings is estimated by discounting the future cash flows using current interest rates at which similar borrowings could be made by us.

The methodologies used for measuring fair value have been categorized into three broad levels as follows:

- Level 1—Quoted prices in active markets for identical instruments.
  
  Level 2—Valuations based principally on other observable market parameters, including
  
  •
  
  Quoted prices in active markets for similar instruments,
  
  •
  
  Quoted prices in less active or inactive markets for identical or similar instruments,
  
  •
  
  Other observable inputs (such as interest rates, yield curves, volatilities, prepayment speeds, loss severities, credit risks and default rates), and
  
  •
  
  Market corroborated inputs (derived principally from or corroborated by observable market data).

- Level 3—Valuations based significantly on unobservable inputs.
  
  •
  
  Valuations based on third-party indications (broker quotes or counterparty quotes) which were, in turn, based significantly on unobservable inputs or were otherwise not supportable as Level 2 valuations.
  
  •
  
  Valuations based on internal models with significant unobservable inputs.

Concentrations of Credit Risk

Concentrations of Credit Risk

Accounting Standards Updates

Accounting Standards Updates

Organization and Basis of Presentation (Tables)

12 Months Ended

Dec. 31, 2012

Organization and Basis of Presentation

Schedule of commercial office properties

Location	Ownership

Manhattan	Consolidated properties	13	7,201,400	96.0	%
Suburban	Consolidated properties	17	2,785,500	79.5	%

		30	9,986,900	91.4	%

(1): The weighted average occupancy represents the total leased square feet divided by total available rentable square feet.

Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2012

Significant Accounting Policies

Schedule of estimated useful lives

Category		Term

Building (fee ownership)		40 years
Building improvements		shorter of remaining life of the building or useful life
Building (leasehold interest)		lesser of 40 years or remaining term of the lease
Property under capital lease		remaining lease term
Furniture and fixtures		four to seven years
Tenant improvements		shorter of remaining term of the lease or useful life

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

	December 31, 2012			December 31, 2011

Identified intangible assets (included in other assets):
Gross amount	$	199,845		$	181,028
Accumulated amortization		(125,009	)		(104,441	)

Net	$	74,836		$	76,587

Identified intangible liabilities (included in deferred revenue):
Gross amount	$	399,088		$	384,141
Accumulated amortization		(227,637	)		(190,995	)

Net	$	171,451		$	193,146

Schedule of estimated annual amortization of acquired below-market leases, net of acquired above-market leases


2013	$	11,419
2014		7,824
2015		6,362
2016		6,314
2017		6,290

Schedule of estimated annual amortization of all other identifiable assets


2013	$	5,917
2014		4,651
2015		3,982
2016		2,832
2017		2,010

Property Acquisitions (Tables)

12 Months Ended

Dec. 31, 2012

Property Acquisitions

Schedule of allocation of the purchase price of the assets acquired and liabilities assumed

The following summarizes our allocation of the purchase price of the assets acquired and liabilities assumed upon the closing of these 2012 acquisitions (amounts in thousands):

	635 and 641 Sixth Avenue		304 Park Avenue South

Land	$	69,848	$	54,189
Building		104,474		75,619
Above market lease value		—		2,824
Acquired in-place leases		7,727		8,265
Other assets, net of other liabilities		—		—

Assets acquired		182,049		140,897

Below market lease value		9,049		5,897

Liabilities assumed		9,049		5,897

Purchase price allocation	$	173,000	$	135,000

Net consideration funded by us at closing	$	173,000	$	135,000

Equity and/or debt investment held	$	—	$	—

Debt assumed	$	—	$	—

Debt and Preferred Equity Investments (Tables)

12 Months Ended

Dec. 31, 2012

Debt and Preferred Equity Investments

Schedule of debt and preferred equity investments

Type	December 31, 2012 Senior Financing		December 31, 2012 Carrying Value, Net of Discounts		December 31, 2011 Carrying Value, Net of Discounts

Preferred equity⁽¹⁾	$	480,000	$	100,831	$	—		July 2014
Preferred equity		70,000		10,000		—		October 2014
Preferred equity⁽¹⁾⁽²⁾		57,087		19,136		—		April 2016
Preferred equity⁽¹⁾		926,260		210,918		—		July 2016
Debt investment⁽³⁾		—		—		8,725		—
Loan loss reserve⁽³⁾		—		—		(8,125	)	—

	$	1,533,347	$	340,885	$	600

(1): The difference between the pay and accrual rates is included as an addition to the principal balance outstanding.
(2): As of December 31, 2012, we are committed to fund an additional $6.5 million on this loan.
(3): Loan loss reserves are specifically allocated to investments. Our reserves reflect management's judgment of the probability and severity of losses based on Level 3 data. We cannot be certain that our judgment will prove to be correct and that reserves will be adequate over time to protect against potential future losses.

Mortgage Note and Other Loans Payable (Tables)

12 Months Ended

Dec. 31, 2012

Mortgage Note and Other Loans Payable

Schedule of the first mortgage note and other loans payable collateralized by the property, assignment of leases and investment

Property				December 31, 2012		December 31, 2011

609 Partners, LLC⁽²⁾	5.00	%	7/2014	$	23	$	31,721
Other loan payable⁽³⁾	8.00	%	9/2019		50,000		—
919 Third Avenue New York, NY⁽⁴⁾	5.12	%	6/2023		500,000		500,000
609 Fifth Avenue⁽⁵⁾	—		—		—		94,963
673 First Avenue⁽⁶⁾	—		—		—		29,906
110 East 42^nd Street⁽⁷⁾	—		—		—		65,000

				$	550,023	$	721,590

(1): Effective weighted average interest rate for the year ended December 31, 2012.
(2): As part of an acquisition, the Operating Partnership issued 63.9 million units of its 5.0% Series E preferred units, or the Series E units, with a liquidation of $1.00 per unit. As of December 31, 2012, 63.8 million Series E units had been redeemed.
(3): This loan is secured by a portion of a preferred equity investment.
(4): We own a 51% controlling interest in the joint venture that is the borrower on this loan. This loan is non-recourse to us. In June 2011, our joint venture replaced the $219.6 million 6.87% mortgage that was due to mature in August 2011 with a $500.0 million mortgage.
(5): In December 2012, we repaid the $93.3 million loan, which bore interest at a fixed of 5.85% per annum and was scheduled to mature in October 2013. We recognized a loss from early extinguishment of debt of approximately $3.1 million consisting mainly of prepayment penalty.
(6): In November 2012, we repaid the $29.1 million mortgage loan, which bore interest at a fixed rate of 5.67% per annum and was scheduled to mature in February 2013. There was no prepayment penalty
(7): Prior to transfer of this property to us, the Operating Partnership took control of this property in May 2011 and assumed the mortgage as part of the transaction. This loan consists of a $65.0 million A-tranche and an $18.1 million B-tranche which was owed to us. The B-tranche does not accrue interest and is due only under certain circumstances as described in the loan agreement. In December 2012, we repaid the $65.0 million mortgage loan, which bore interest at a fixed rate of 5.81% per annum and was scheduled to mature in July 2017. There was no prepayment penalty.

Corporate Indebtedness (Tables)

12 Months Ended

Dec. 31, 2012

Corporate Indebtedness

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

The following table sets forth our senior unsecured notes and other related disclosures as of December 31, 2012 and 2011, respectively, by scheduled maturity date (amounts in thousands):

Issuance	December 31, 2012 Unpaid Principal Balance		December 31, 2012 Accreted Balance		December 31, 2011 Accreted Balance

August 13, 2004⁽²⁾	$	75,898	$	75,898	$	98,578	5.88	%	5.88	%	10	August 15, 2014
March 31, 2006⁽²⁾		255,308		255,165		274,804	6.00	%	6.02	%	10	March 31, 2016
August 5, 2011⁽³⁾		250,000		249,620		249,565	5.00	%	5.03	%	7	August 15, 2018
March 16, 2010⁽³⁾		250,000		250,000		250,000	7.75	%	7.75	%	10	March 15, 2020
November 15, 2012⁽³⁾		200,000		200,000		—	4.50	%	4.50	%	10	December 1, 2022
June 27, 2005⁽⁴⁾		7		7		657	4.00	%	4.00	%	20	June 15, 2025

	$	1,031,213	$	1,030,690	$	873,604

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

(2): On December 27, 2012, we repurchased $42.4 million aggregate principal amount of these notes, consisting of $22.7 million of the 5.875% Notes and $19.7 million of the 6.0% Notes, for a total consideration of $46.4 million and realized a net loss on early extinguishment of debt of approximately $3.8 million.
(3): We, SL Green and the Operating Partnership are co-obligors.
(4): Exchangeable senior debentures which are currently callable at par. In addition, the debentures can be put to us, at the option of the holder at par plus accrued and unpaid interest, on June 15, 2015 and 2020 and upon the occurrence of certain change of control transactions. As a result of the Merger, the adjusted exchange rate for the debentures is 7.7461 shares of SL Green's common stock per $1,000 of principal amount of debentures and the adjusted reference dividend for the debentures is $1.3491. During the year ended December 31, 2012, we repurchased $650,000 of these bonds at par.

Schedule of Combined aggregate principal maturities of mortgage and other loans payable, 2012 credit facility and senior unsecured notes, including as-of-right extension options

	Scheduled Amortization		Principal Repayments		Revolving Credit Facility		Term loan and Senior Unsecured Notes		Total

2013	$	—	$	—	$	—	$	—	$	—
2014		—		23		—		75,898		75,921
2015		—		—		—		7		7
2016		4,116		—		—		255,165		259,281
2017		7,056		—		—		—		7,056
Thereafter		38,220		500,608		70,000		1,099,620		1,708,448

	$	49,392	$	500,631	$	70,000	$	1,430,690	$	2,050,713

Schedule of Consolidated Interest expense, excluding capitalized interest

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

	Years Ended December 31,

	2012			2011			2010
				As Adjusted			As Adjusted
Interest expense	$	108,634		$	82,516		$	70,965
Interest income		(68	)		(94	)		(138	)

Interest expense, net	$	108,566		$	82,422		$	70,827

Interest capitalized	$	—		$	—		$	—

- Definition

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

+ References

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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823

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

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(e),(f))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400

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

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

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

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 22
-Article 5

+ Details

Rental Income (Tables)

12 Months Ended

Dec. 31, 2012

Rental Income

Schedule of approximate future minimum rents to be received over the next five years and thereafter

Approximate future minimum rents to be received over the next five years and thereafter for non-cancelable operating leases in effect at December 31, 2012 for the consolidated properties, including consolidated joint venture properties, are as follows (amounts in thousands):

Year	Consolidated Properties

2013	$	415,979
2014		400,077
2015		384,182
2016		358,766
2017		323,224
Thereafter		1,510,576

	$	3,392,804

Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2012

Benefit Plans

Schedule of contributions made to multi-employer plans

Contributions we made to the multi-employer plans for the years ended December 31, 2012, 2011 and 2010 are included in the table below (amounts in thousands):

	Years Ended December 31,

Benefit Plan	2012		2011		2010
			As Adjusted		As Adjusted
Pension Plan	$	1,004	$	975	$	828
Health Plan		3,165		2,933		2,650
Other plans		2,431		2,465		2,260

Total plan contributions	$	6,600	$	6,373	$	5,738

Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2012

Commitments and Contingencies

Schedule of future minimum lease payments under capital leases and noncancellable operating leases

December 31,	Capital lease			Non-cancellable operating leases

2013	$	1,555		$	17,274
2014		1,555			17,274
2015		1,593			17,500
2016		1,707			17,954
2017		1,707			17,954
Thereafter		40,644			1,231,425

Total minimum lease payments		48,761		$	1,319,381

Less amount representing interest		(31,575	)

Present value of net minimum lease payment	$	17,186

Segment Information (Tables)

12 Months Ended

Dec. 31, 2012

Segment Information

Schedule of Selected results of operations and selected asset information

	Real Estate Segment		Debt and Preferred Equity Segment		Total Company

Total revenues:
Year ended December 31, 2012	$	519,312	$	9,497	$	528,809
Year ended December 31, 2011, As Adjusted		498,480		3,077		501,557
Year ended December 31, 2010, As Adjusted		488,904		1,231		490,135
Income from continuing operations:
Year ended December 31, 2012	$	30,646	$	8,360	$	39,006
Year ended December 31, 2011, As Adjusted		59,438		5,440		64,878
Year ended December 31, 2010, As Adjusted		83,707		901		84,608
Total assets
As of:
December 31, 2012	$	5,057,563	$	340,999	$	5,398,562
December 31, 2011		4,855,798		600		4,856,398

Schedule of reconciliation of income from continuing operations to net income attributable to common unitholder

The table below reconciles income from continuing operations to net income attributable to common unitholder for the years ended December 31, 2012, 2011 and 2010 (amounts in thousands):

	Years Ended December 31,

	2012			2011			2010
				As Adjusted			As Adjusted
Income from continuing operations	$	39,006		$	64,878		$	84,608
Net loss from discontinued operations		—			—			—

Net income		39,006			64,878			84,608
Net income attributable to noncontrolling interests in other partnerships		(6,013	)		(9,886	)		(13,682	)

Net income attributable to ROP common unitholder	$	32,993		$	54,992		$	70,926

- Definition

Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss.

+ References + Details

Financial Instruments: Derivatives and Hedging (Tables)

12 Months Ended

Dec. 31, 2012

Financial Instruments: Derivatives and Hedging

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

		Amount of Loss Recognized in Other Comprehensive Loss (Effective Portion) For the Year Ended December 31,								Amount of Loss Reclassified from Accumulated Other Comprehensive Loss into Interest Expense (Effective Portion) For the Year Ended December 31,								Amount of Loss Recognized in Interest Expense (Ineffective Portion) For the Year Ended December 31,

Designation\Cash Flow	Derivative	2012			2011			2010		2012			2011			2010		2012			2011			2010
Qualifying	Interest Rate Swaps/Caps	$	(794	)	$	(5,924	)		—	$	(986	)	$	(807	)		—	$	(3	)	$	(16	)		—
Non-qualifying	Interest Rate Caps/Currency Hedges		—			—			—		—			—			—		—			—			—

- Definition

Tabular disclosure of the location and amount of gains and losses reported in the statement of financial performance, or when applicable, the statement of financial position. For example, (a) gains and losses recognized in the income statement on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges and (b) gains and losses initially recognized in other comprehensive income on derivative instruments designated and qualifying as cash flow hedges.

+ References + Details

Supplemental Disclosure of Non-Cash Investing and Financing Activities (Tables)

12 Months Ended

Dec. 31, 2012

Supplemental Disclosure of Non-Cash Investing and Financing Activities

Schedule of information on non-cash investing and financing activities

The following table provides information on non-cash investing and financing activities (amounts in thousands):

	Years ended December 31,

	2012		2011
Tenant improvements and capital expenditures payable	$	619	$	2,646
Deferred leasing payable		1,332		1,813
Change in fair value of hedge		192		1,716
Transfer of treasury lock hedge		—		3,591
Contributions from common unitholder		33,090		—
Transfer of commercial real estate property, net		—		77,667
Transfer of preferred equity investments		324,858		15,697
Transfer of mortgage note and other loans payable		50,023		65,000
Redemption of Series E units		31,698		—

Quarterly Financial Data (unaudited) (Tables)

12 Months Ended

Dec. 31, 2012

Quarterly Financial Data (unaudited)

Schedule of Quarterly results of operations

2012 Quarter Ended	December 31			September 30			June 30			March 31

				As Adjusted			As Adjusted			As Adjusted
Total revenues	$	142,917		$	131,584		$	127,476		$	126,832

Income from continuing operations before loss on extinguishment of debt, equity in net loss (gain) on sale of interest in unconsolidated joint venture, equity in net income from unconsolidated joint venture and noncontrolling interests	$	12,917		$	11,282		$	11,006		$	8,738
Loss on extinguishment of debt		(6,904	)		—			—			—
Equity in net loss (gain) on sale of interest in unconsolidated joint venture		(10	)		(4,778	)		5,789			—
Equity in net income from unconsolidated joint venture		(3	)		183			660			126

Net income		6,000			6,687			17,455			8,864
Net income attributable to noncontrolling interests in other partnerships		(1,385	)		(1,188	)		(2,067	)		(1,373	)

Net income attributable to ROP common unitholder	$	4,615		$	5,499		$	15,388		$	7,491

2011 Quarter Ended	December 31			September 30			June 30			March 31

	As Adjusted			As Adjusted			As Adjusted			As Adjusted
Total revenues	$	125,657		$	123,289		$	123,557		$	129,054

Income from continuing operations before depreciable real estate reserves, equity in net income from unconsolidated joint venture and noncontrolling interests	$	10,469		$	11,520		$	19,318		$	28,863
Depreciable real estate reserves		(5,789	)		—			—			—
Equity in net income from unconsolidated joint venture		99			119			133			146

Net income		4,779			11,639			19,451			29,009
Net income attributable to noncontrolling interests in other partnerships		(1,504	)		(1,653	)		(3,176	)		(3,553	)

Net income attributable to ROP common unitholder	$	3,275		$	9,986		$	16,275		$	25,456

Organization and Basis of Presentation (Details) $ in Thousands	1 Months Ended
	Dec. 31, 2012 USD ($) a ft² item	Nov. 30, 2011 item	Sep. 30, 2012 USD ($)	Dec. 31, 2011 USD ($)	Nov. 01, 2011 USD ($)
Organization and Basis of Presentation
Number of properties transferred from the operating partnership to the entity by SL Green \| item	3	5
Carrying value of properties transferred by SL Green \| $	$ 320,200				$ 683,800
Carrying value of preferred equity investments transferred by SL Green \| $			$ 324,900
Carrying value of one of the preferred equity investments subject to secured loan transferred by SL Green \| $			$ 50,000
Real estate properties
Preferred equity investments \| $	$ 340,885			$ 600
Development parcels
Real estate properties
Number of Properties \| item	4
Area of land (in acres) \| a	81
Estimated area of office space that can be developed on land held (in square feet) \| ft²	1,100,000
Invested amount for development of office space \| $	$ 67,100
Development property
Real estate properties
Square Feet \| ft²	104,000
Manhattan \| Consolidated properties
Real estate properties
Number of Properties \| item	13
Square Feet \| ft²	7,201,400
Weighted Average Occupancy (as a percent)	96.00%
Suburban \| Consolidated properties
Real estate properties
Number of Properties \| item	17
Square Feet \| ft²	2,785,500
Weighted Average Occupancy (as a percent)	79.50%
Total
Real estate properties
Number of Properties \| item	30
Square Feet \| ft²	9,986,900
Weighted Average Occupancy (as a percent)	91.40%

Significant Accounting Policies (Details) - USD ($)	3 Months Ended	12 Months Ended
Significant Accounting Policies (Details) - USD ($)	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Investment in Commercial Real Estate Properties
Depreciation expense		$ 130,300,000	$ 124,000,000	$ 118,500,000
Impairment charges recorded	$ 5,789,000		5,789,000
Increase in rental revenue from amortization of acquired leases		20,200,000	22,500,000	22,400,000
Increase /( reduction) in interest expense from amortization of above-market rate mortgages		700,000	(1,200,000)	$ (1,800,000)
Identified intangible assets (included in other assets):
Gross amount	181,028,000	199,845,000	181,028,000
Accumulated amortization	(104,441,000)	(125,009,000)	(104,441,000)
Net	76,587,000	74,836,000	76,587,000
Identified intangible liabilities (included in deferred revenue):
Gross amount	384,141,000	399,088,000	384,141,000
Accumulated amortization	(190,995,000)	(227,637,000)	(190,995,000)
Net	$ 193,146,000	$ 171,451,000	$ 193,146,000
Maximum
Investment in Commercial Real Estate Properties
Period from cessation of major construction to consider construction project as complete and available for occupancy		1 year
Building (fee ownership)
Investment in Commercial Real Estate Properties
Estimated useful life		40 years
Building (leasehold interest) \| Maximum
Investment in Commercial Real Estate Properties
Estimated useful life		40 years
Furniture and fixtures \| Minimum
Investment in Commercial Real Estate Properties
Estimated useful life		4 years
Furniture and fixtures \| Maximum
Investment in Commercial Real Estate Properties
Estimated useful life		7 years
Buildings \| Minimum
Investment in Commercial Real Estate Properties
Estimated useful life		3 years
Buildings \| Maximum
Investment in Commercial Real Estate Properties
Estimated useful life		40 years
Other intangible assets \| Minimum
Investment in Commercial Real Estate Properties
Estimated useful life of intangible assets		1 year
Other intangible assets \| Maximum
Investment in Commercial Real Estate Properties
Estimated useful life of intangible assets		14 years
Above-market leases \| Minimum
Investment in Commercial Real Estate Properties
Estimated useful life of intangible assets		1 year
Above-market leases \| Maximum
Investment in Commercial Real Estate Properties
Estimated useful life of intangible assets		14 years
Below-market leases \| Minimum
Investment in Commercial Real Estate Properties
Estimated useful life of intangible assets		1 year
Below-market leases \| Maximum
Investment in Commercial Real Estate Properties
Estimated useful life of intangible assets		14 years
In-place leases \| Minimum
Investment in Commercial Real Estate Properties
Estimated useful life of intangible assets		1 year
In-place leases \| Maximum
Investment in Commercial Real Estate Properties
Estimated useful life of intangible assets		14 years
Acquired below-market leases, net of acquired above-market leases
Estimated annual amortization
2013		$ 11,419,000
2014		7,824,000
2015		6,362,000
2016		6,314,000
2017		6,290,000
All other identifiable assets
Estimated annual amortization
2013		5,917,000
2014		4,651,000
2015		3,982,000
2016		2,832,000
2017		$ 2,010,000

Significant Accounting Policies (Details 2) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Revenue Recognition
Period after which payments become due	90 days
Reserve for Possible Credit Losses
Loan loss reserve charge offs	$ 0.0	$ 0.7	$ 0.0
Recoveries recorded in connection with sale of debt investments	$ 0.5	$ 3.1	$ 0.0
Joint venture
Investment in Unconsolidated Joint Ventures
Amortization period of difference between carrying amount of investments and underlying equity in net assets	10 years

Significant Accounting Policies (Details 3)	12 Months Ended
Significant Accounting Policies (Details 3)	Dec. 31, 2012 item
Concentrations of Credit Risk
Number of tenants concentration risk	2
Annualized cash rent \| Customer concentration
Concentrations of Credit Risk
Maximum percentage of annualized cash rent for any one tenant not individually disclosed	2.90%
Annualized cash rent \| Customer concentration \| 1185 Avenue of the Americas
Concentrations of Credit Risk
Percentage of concentration	18.00%
Annualized cash rent \| Customer concentration \| 919 Third Avenue
Concentrations of Credit Risk
Percentage of concentration	10.00%
Annualized cash rent \| Customer concentration \| 750 Third Avenue
Concentrations of Credit Risk
Percentage of concentration	10.00%
Annualized cash rent \| Customer concentration \| 810 Seventh Avenue
Concentrations of Credit Risk
Percentage of concentration	9.00%
Annualized cash rent \| Customer concentration \| 1350 Avenue of the Americas
Concentrations of Credit Risk
Percentage of concentration	9.00%
Annualized cash rent \| First tenant \| Customer concentration
Concentrations of Credit Risk
Percentage of concentration	5.00%
Annualized cash rent \| Second tenant \| Customer concentration
Concentrations of Credit Risk
Percentage of concentration	3.20%

Property Acquisitions (Details) $ in Thousands	Sep. 30, 2012 USD ($) ft²	Jun. 30, 2012 USD ($) ft²
304 Park Avenue
Property Acquisition
Area of property (in square feet) \| ft²		215,000
Cash paid		$ 102,000
Value of units of limited partnership interest in the Operating Partnership		33,000
Allocation of the purchase price of the assets acquired and liabilities assumed
Land		54,189
Building		75,619
Above market lease value		2,824
Acquired in-place leases		8,265
Assets acquired		140,897
Below market lease value		5,897
Liabilities assumed		5,897
Purchase price allocation		135,000
Net consideration funded by us at closing		$ 135,000
635 and 641 Sixth Avenue
Property Acquisition
Area of property (in square feet) \| ft²	267,000
Allocation of the purchase price of the assets acquired and liabilities assumed
Land	$ 69,848
Building	104,474
Acquired in-place leases	7,727
Assets acquired	182,049
Below market lease value	9,049
Liabilities assumed	9,049
Purchase price allocation	173,000
Net consideration funded by us at closing	$ 173,000

Debt and Preferred Equity Investments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Debt and preferred equity investments
Senior Financing	$ 1,533,347
Loan loss reserve		$ (8,125)
Carrying value, net of discounts and net of loan loss reserve	$ 340,885	600
Debt and preferred equity
Debt and preferred equity investments
Aggregate weighted average current yield (as a percent)	10.12%
Preferred equity with initial mandatory redemption on July, 2014
Debt and preferred equity investments
Senior Financing	$ 480,000
Carrying Value, Net of Discounts	100,831
Preferred equity with initial mandatory redemption on October, 2014
Debt and preferred equity investments
Senior Financing	70,000
Carrying Value, Net of Discounts	10,000
Preferred equity with initial mandatory redemption on April, 2016
Debt and preferred equity investments
Senior Financing	57,087
Carrying Value, Net of Discounts	19,136
Committed additional contribution	6,500
Preferred equity with initial mandatory redemption on July, 2016
Debt and preferred equity investments
Senior Financing	926,260
Carrying Value, Net of Discounts	$ 210,918
Debt investment
Debt and preferred equity investments
Carrying Value, Net of Discounts		$ 8,725

Investment in Unconsolidated Joint Venture (Details)		1 Months Ended			3 Months Ended				12 Months Ended
Investment in Unconsolidated Joint Venture (Details)	Nov. 30, 2005 USD ($)	Jul. 31, 2012 USD ($)	Nov. 30, 2011 USD ($)	May 31, 2005 USD ($) ft² story	Dec. 31, 2012 USD ($)	Sep. 30, 2012 USD ($)	Jun. 30, 2012 USD ($)	Dec. 31, 2011 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2011 USD ($)
Investment in Unconsolidated Joint Ventures
Impairment charges recorded								$ 5,789,000		$ 5,789,000
Equity in net gain on sale of interest in unconsolidated joint venture					$ (10,000)	$ (4,778,000)	$ 5,789,000		$ 1,001,000
One Court Square
Investment in Unconsolidated Joint Ventures
Real estate property acquired (in sq ft.) \| ft²				1,400,000
Number of stories in real estate property acquired \| story				50
Acquisition price				$ 471,000,000
Percentage of property leased to seller				100.00%
Lease term				15 years
Joint venture interest sold (as a percent)	70.00%
Consideration received for sale of joint venture interest	$ 329,700,000
Mortgage debt assumed by joint venture partner	$ 220,500,000
Sales price		$ 481,100,000	$ 475,600,000
Impairment charges recorded			$ 5,800,000
Outstanding mortgage debt		315,000,000
Equity in net gain on sale of interest in unconsolidated joint venture		$ 1,000,000

Mortgage Note and Other Loans Payable (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions	1 Months Ended			3 Months Ended	12 Months Ended
	Dec. 31, 2012	Nov. 30, 2012	Jun. 30, 2011	Dec. 31, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	May 31, 2011
Mortgage note and other loan payable
Mortgage note and other loan payable	$ 550,023			$ 550,023	$ 550,023	$ 721,590
Refinanced mortgage loan						500,000
Gross book value of the property and investment collateralizing the mortgage note and other loan payable	1,300,000			1,300,000	1,300,000
Loss on early extinguishment of debt				6,904	$ 6,904		$ 1,202
Consolidated joint venture \| Other loan payable
Mortgage note and other loan payable
Interest rate (as a percent)					8.00%
Mortgage note and other loan payable	$ 50,000			$ 50,000	$ 50,000
609 Partners, LLC
Mortgage note and other loan payable
Number of Series E preferred units issued	63.9			63.9	63.9
Dividend rate of Series E preferred units (as a percent)					5.00%
Liquidation price per unit of Series E preferred units (in dollor per share)	$ 1.00			$ 1.00	$ 1.00
Series E preferred units redeemed (in shares)	63.8			63.8	63.8
609 Partners, LLC \| Consolidated joint venture
Mortgage note and other loan payable
Interest rate (as a percent)					5.00%
Mortgage note and other loan payable	$ 23			$ 23	$ 23	31,721
919 Third Avenue New York, NY
Mortgage note and other loan payable
Controlling interest in the joint venture (as a percent)	51.00%			51.00%	51.00%
919 Third Avenue New York, NY \| Consolidated joint venture
Mortgage note and other loan payable
Interest rate (as a percent)					5.12%
Mortgage note and other loan payable	$ 500,000			$ 500,000	$ 500,000	500,000
Repaid loan			$ 219,600
Refinanced mortgage loan			$ 500,000
Interest rate of repaid mortgage loan (as a percent)			6.87%
609 Fifth Avenue
Mortgage note and other loan payable
Repaid loan	$ 93,300
Fixed interest rate of debt (as a percent)	5.85%			5.85%	5.85%
Loss on early extinguishment of debt	$ 3,100
609 Fifth Avenue \| Consolidated joint venture
Mortgage note and other loan payable
Mortgage note and other loan payable						94,963
673 First Ave
Mortgage note and other loan payable
Repaid loan		$ 29,100
Fixed interest rate of debt (as a percent)		5.67%
673 First Ave \| Consolidated joint venture
Mortgage note and other loan payable
Mortgage note and other loan payable						29,906
110 East 42nd Street
Mortgage note and other loan payable
Repaid loan	$ 65,000
Fixed interest rate of debt (as a percent)	5.81%			5.81%	5.81%
110 East 42nd Street \| A-tranche
Mortgage note and other loan payable
Total fixed rate debt								$ 65,000
110 East 42nd Street \| B-tranche
Mortgage note and other loan payable
Total fixed rate debt								$ 18,100
110 East 42nd Street \| Consolidated joint venture
Mortgage note and other loan payable
Mortgage note and other loan payable						$ 65,000

Corporate Indebtedness (Details)		3 Months Ended	12 Months Ended
Corporate Indebtedness (Details)	Dec. 27, 2012 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2012 USD ($) shares	Dec. 31, 2011 USD ($)	Dec. 31, 2010 USD ($)	Nov. 30, 2012 USD ($)
Debt disclosures by scheduled maturity date
Accreted Balance		$ 1,430,690,000	$ 1,430,690,000	$ 873,604,000
(Gain) loss on early extinguishment of debt		6,904,000	6,904,000		$ 1,202,000
Principal Repayments
Line of credit		70,000,000	70,000,000	350,000,000
Scheduled amortization and principal repayments
2014		75,921,000	75,921,000
2015		7,000	7,000
2016		259,281,000	259,281,000
2017		7,056,000	7,056,000
Thereafter		1,708,448,000	1,708,448,000
Total amortization of debt and principal repayments		2,050,713,000	2,050,713,000
Interest expense
Interest expense			108,634,000	82,516,000	70,965,000
Interest income			(68,000)	(94,000)	(138,000)
Interest expense, net			$ 108,566,000	82,422,000	$ 70,827,000
2012 Credit Facility
Corporate Indebtedness
Maximum borrowing capacity						$ 1,600,000,000
Extension option available, one			6 months
Extension option available, two			6 months
Maximum borrowing capacity, optional expansion		1,500,000,000	$ 1,500,000,000
Interest rate, description			LIBOR
Letters of credit		79,500,000	$ 79,500,000
Total undrawn capacity		$ 1,100,000,000	$ 1,100,000,000
Revolving credit facility
Corporate Indebtedness
Maximum borrowing capacity						1,200,000,000
Interest rate added to base rate (as a percent)		1.45%	1.45%
Extension fee required to be paid (as a percent)			0.10%
Facility fee on total commitments, payable quarterly in arrears (as a percent)			0.30%
Principal Repayments
Thereafter		$ 70,000,000	$ 70,000,000
Line of credit		$ 70,000,000	$ 70,000,000
Revolving credit facility \| Minimum
Corporate Indebtedness
Interest rate added to base rate (as a percent)		1.00%	1.00%
Facility fee on total commitments, payable quarterly in arrears (as a percent)			0.15%
Revolving credit facility \| Maximum
Corporate Indebtedness
Interest rate added to base rate (as a percent)		1.75%	1.75%
Facility fee on total commitments, payable quarterly in arrears (as a percent)			0.35%
Term loan
Corporate Indebtedness
Maximum borrowing capacity						$ 400,000,000
Interest rate added to base rate (as a percent)		1.65%	1.65%
Principal Repayments
Line of credit		$ 400,000,000	$ 400,000,000
Term loan \| Minimum
Corporate Indebtedness
Interest rate added to base rate (as a percent)		1.15%	1.15%
Term loan \| Maximum
Corporate Indebtedness
Interest rate added to base rate (as a percent)		2.00%	2.00%
2011 Revolving Credit Facility
Corporate Indebtedness
Maximum borrowing capacity		$ 1,500,000,000	$ 1,500,000,000
Interest rate, description			LIBOR
2011 Revolving Credit Facility \| Minimum
Corporate Indebtedness
Interest rate added to base rate (as a percent)		1.00%	1.00%
Facility fee on total commitments, payable quarterly in arrears (as a percent)			0.175%
2011 Revolving Credit Facility \| Maximum
Corporate Indebtedness
Interest rate added to base rate (as a percent)		1.85%	1.85%
Facility fee on total commitments, payable quarterly in arrears (as a percent)			0.45%
Senior Unsecured Notes
Debt disclosures by scheduled maturity date
Unpaid Principal Balance		$ 1,031,213,000	$ 1,031,213,000
Accreted Balance		1,030,690,000	1,030,690,000	873,604,000
4.00% senior unsecured notes maturing on June 15, 2025
Debt disclosures by scheduled maturity date
Unpaid Principal Balance		7,000	7,000
Accreted Balance		$ 7,000	$ 7,000	657,000
Coupon Rate (as a percent)		4.00%	4.00%
Effective Rate (as a percent)		4.00%	4.00%
Term			20 years
Adjusted exchange rate for the debentures of SL Green common stock (in shares) \| shares			7.7461
Principal amount of debentures, basis for conversion		$ 1,000	$ 1,000
Adjusted reference dividend for debentures			1.3491
Repayment of debt			$ 650,000
4.50% senior unsecured notes maturing on December 01, 2022
Debt disclosures by scheduled maturity date
Unpaid Principal Balance		200,000,000	200,000,000
Accreted Balance		$ 200,000,000	$ 200,000,000
Coupon Rate (as a percent)		4.50%	4.50%
Effective Rate (as a percent)		4.50%	4.50%
Term			10 years
7.75% senior unsecured notes maturing on March 15, 2020
Debt disclosures by scheduled maturity date
Unpaid Principal Balance		$ 250,000,000	$ 250,000,000
Accreted Balance		$ 250,000,000	$ 250,000,000	250,000,000
Coupon Rate (as a percent)		7.75%	7.75%
Effective Rate (as a percent)		7.75%	7.75%
Term			10 years
5.00% senior unsecured notes maturing on August 15, 2018
Debt disclosures by scheduled maturity date
Unpaid Principal Balance		$ 250,000,000	$ 250,000,000
Accreted Balance		$ 249,620,000	$ 249,620,000	249,565,000
Coupon Rate (as a percent)		5.00%	5.00%
Effective Rate (as a percent)		5.03%	5.03%
Term			7 years
3.00% exchangeable senior notes due 2017
Debt disclosures by scheduled maturity date
Coupon Rate (as a percent)		3.00%	3.00%
6.00% senior unsecured notes maturing on March 31, 2016 and 5.875% senior unsecured notes maturing on August 15, 2014
Debt disclosures by scheduled maturity date
Repurchase of debt	$ 42,400,000
(Gain) loss on early extinguishment of debt	3,800,000
Repayment of debt	$ 46,400,000
6.00% senior unsecured notes maturing on March 31, 2016
Debt disclosures by scheduled maturity date
Unpaid Principal Balance		$ 255,308,000	$ 255,308,000
Accreted Balance		$ 255,165,000	$ 255,165,000	274,804,000
Coupon Rate (as a percent)	6.00%	6.00%	6.00%
Effective Rate (as a percent)		6.02%	6.02%
Term			10 years
Repurchase of debt	$ 19,700,000
5.88% senior unsecured notes maturing on August 15, 2014
Debt disclosures by scheduled maturity date
Unpaid Principal Balance		$ 75,898,000	$ 75,898,000
Accreted Balance		$ 75,898,000	$ 75,898,000	$ 98,578,000
Coupon Rate (as a percent)	5.875%	5.88%	5.88%
Effective Rate (as a percent)		5.88%	5.88%
Term			10 years
Repurchase of debt	$ 22,700,000
Mortgage Loans Payable
Scheduled Amortization
2016		$ 4,116,000	$ 4,116,000
2017		7,056,000	7,056,000
Thereafter		38,220,000	38,220,000
Total amortization of debt		49,392,000	49,392,000
Principal Repayments
2014		23,000	23,000
Thereafter		500,608,000	500,608,000
Total principal repayments		500,631,000	500,631,000
Term loan and Senior Unsecured Notes
Principal Repayments
2014		75,898,000	75,898,000
2015		7,000	7,000
2016		255,165,000	255,165,000
Thereafter		1,099,620,000	1,099,620,000
Total principal repayments		$ 1,430,690,000	$ 1,430,690,000

Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2012	Dec. 31, 2011
Fair Value of Financial Instruments
Mortgage note and other loan payable and the senior unsecured notes	$ 1,600,000
Debt instrument hedged amount	30,000
Floating rate debt inclusive of revolving credit facility	440,000
Preferred equity investments	340,885	$ 600
Level 3
Fair Value of Financial Instruments
Mortgage note and other loan payable and the senior unsecured notes	1,800,000
Floating rate debt inclusive of revolving credit facility	435,200
Preferred equity investments	340,900
Level 3 \| Maximum
Fair Value of Financial Instruments
Preferred equity investments	400,000
Level 3 \| Minimum
Fair Value of Financial Instruments
Preferred equity investments	$ 300,000

Rental Income (Details) - Consolidated Properties $ in Thousands	Dec. 31, 2012 USD ($)
Approximate future minimum rents to be received over the next five years and thereafter for non-cancelable operating leases
2013	$ 415,979
2014	400,077
2015	384,182
2016	358,766
2017	323,224
Thereafter	1,510,576
Total minimum lease payments	$ 3,392,804

Related Party Transactions (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Affiliate
Related Party Transactions
Profit participation received by related party	$ 3.4	$ 2.3	$ 1.8
Alliance Building Services
Related Party Transactions
Payments made for services	5.3	4.7	6.0
SL Green
Related Party Transactions
Allocation of salary and other operating costs from related party	7.0	6.3	6.0
Insurance expense incurred	$ 4.7	$ 4.5	$ 5.3

Benefit Plans (Details) - USD ($) $ in Thousands	12 Months Ended			21 Months Ended
Benefit Plans (Details) - USD ($) $ in Thousands	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Oct. 02, 2010
Multi-employer plans
Employer contributions	$ 6,600	$ 6,373	$ 5,738
Quarterly diversion of employer contributions from the Health Plan to the Pension Plan				$ 1,950
Pension Plan
Multi-employer plans
Plan contributions from all employers	212,700	201,300	193,300
Employer contributions	1,004	975	828
Health Plan
Multi-employer plans
Plan contributions from all employers	893,300	843,200	770,800
Employer contributions	3,165	2,933	2,650
Other plans
Multi-employer plans
Employer contributions	$ 2,431	$ 2,465	$ 2,260

Commitments and Contingencies (Details) $ in Thousands	1 Months Ended	12 Months Ended
Commitments and Contingencies (Details) $ in Thousands	Nov. 30, 2012	Dec. 31, 2012 USD ($) item	Dec. 31, 2011 USD ($)
Commitments and contingencies
Capital lease, cost basis		$ 12,208	$ 12,208
Additional disclosure
Minimum initial term of noncancellable operating leases		1 year
Capital lease
2013		$ 1,555
2014		1,555
2015		1,593
2016		1,707
2017		1,707
Thereafter		40,644
Total minimum lease payments		48,761
Less amount representing interest		(31,575)
Present value of net minimum lease payments		17,186
Future minimum lease payments under non-cancellable operating lease obligations
2013		17,274
2014		17,274
2015		17,500
2016		17,954
2017		17,954
Thereafter		1,231,425
Total minimum lease payments		1,319,381
1185 Avenue of the Americas
Commitments and contingencies
Required annual ground lease payments		$ 6,900
Term of first renewal option		23 years
461 Fifth Avenue
Commitments and contingencies
Required annual ground lease payments		$ 2,100
Number of renewal options available \| item		2
Term of first renewal option		21 years
Term of second renewal option		21 years
Term of third renewal option		15 years
673 First Ave
Commitments and contingencies
Term of first renewal option		25 years
Land area as a percentage of fair market value of the property		70.00%
Initial lease term		49 years
Extension in lease term	50 years
Capital lease, cost basis		$ 12,200
Cumulative amortization		$ 6,300	$ 6,000

Segment Information (Details) $ in Thousands	3 Months Ended								12 Months Ended
Segment Information (Details) $ in Thousands	Dec. 31, 2012 USD ($)	Sep. 30, 2012 USD ($)	Jun. 30, 2012 USD ($)	Mar. 31, 2012 USD ($)	Dec. 31, 2011 USD ($)	Sep. 30, 2011 USD ($)	Jun. 30, 2011 USD ($)	Mar. 31, 2011 USD ($)	Dec. 31, 2012 USD ($) item	Dec. 31, 2011 USD ($)	Dec. 31, 2010 USD ($)
Segment Information
Number of reportable segments \| item									2
Segment information
Total revenues	$ 142,917	$ 131,584	$ 127,476	$ 126,832	$ 125,657	$ 123,289	$ 123,557	$ 129,054	$ 528,809	$ 501,557	$ 490,135
Income from continuing operations									39,006	64,878	84,608
Total assets	5,398,562				4,856,398				$ 5,398,562	4,856,398
Leverage rate assumption (as a percent)									100.00%
Reconciliation of income from continuing operations to net income attributable to common unitholder
Net income	6,000	6,687	17,455	8,864	4,779	11,639	19,451	29,009	$ 39,006	64,878	84,608
Net income attributable to noncontrolling interests in other partnerships	(1,385)	(1,188)	(2,067)	(1,373)	(1,504)	(1,653)	(3,176)	(3,553)	(6,013)	(9,886)	(13,682)
Net income attributable to ROP common unitholder	4,615	$ 5,499	$ 15,388	$ 7,491	3,275	$ 9,986	$ 16,275	$ 25,456	32,993	54,992	70,926
Real Estate Segment
Segment information
Total revenues									519,312	498,480	488,904
Income from continuing operations									30,646	59,438	83,707
Total assets	5,057,563				4,855,798				5,057,563	4,855,798
Debt and Preferred Equity Segment
Segment information
Total revenues									9,497	3,077	1,231
Income from continuing operations									8,360	5,440	$ 901
Total assets	$ 340,999				$ 600				$ 340,999	$ 600

Financial Instruments: Derivatives and Hedging (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Financial Instruments: Derivatives and Hedging
Loss from settlement of hedges included in accumulated other comprehensive loss	$ 3,100
Estimated current balance held in accumulated other comprehensive loss to be reclassified into earnings within the next 12 months	400
Amount of Loss Recognized in Other Comprehensive Loss (Effective Portion) on derivatives qualifying as hedges	(794)	$ (5,924)
Amount of Loss Reclassified from Accumulated Other Comprehensive Loss into Interest Expense (Effective Portion) on derivatives qualifying as hedges	(986)	(807)
Amount of Loss Recognized in Interest Expense (Ineffective Portion) on derivatives qualifying as hedges	$ (3)	$ (16)

Supplemental Disclosure of Non-Cash Investing and Financing Activities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Supplemental Disclosure of Non-Cash Investing and Financing Activities
Tenant improvements and capital expenditures payable	$ 619	$ 2,646
Deferred leasing payable	1,332	1,813
Change in fair value of hedge	192	1,716
Transfer of treasury lock hedge		3,591
Contributions from common unitholder	33,090
Transfer of commercial real estate property, net		77,667
Transfer of preferred equity investments	324,858	15,697
Transfer of mortgage note and other loans payable	50,023	$ 65,000
Redemption of Series E units	$ 31,698

Quarterly Financial Data (unaudited) (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Quarterly Financial Data (unaudited)
Total revenues	$ 142,917,000	$ 131,584,000	$ 127,476,000	$ 126,832,000	$ 125,657,000	$ 123,289,000	$ 123,557,000	$ 129,054,000	$ 528,809,000	$ 501,557,000	$ 490,135,000
Income from continuing operations before loss on extinguishment of debt, equity in net loss (gain) on sale of interest in unconsolidated joint venture, equity in net income from unconsolidated joint venture and noncontrolling interests	12,917,000	11,282,000	11,006,000	8,738,000	10,469,000	11,520,000	19,318,000	28,863,000	43,943,000	70,170,000	85,099,000
Loss on early extinguishment of debt	(6,904,000)								(6,904,000)		(1,202,000)
Depreciable real estate reserves					(5,789,000)					(5,789,000)
Equity in net loss (gain) on sale of interest in unconsolidated joint venture	(10,000)	(4,778,000)	5,789,000						1,001,000
Equity in net income from unconsolidated joint venture	(3,000)	183,000	660,000	126,000	99,000	119,000	133,000	146,000	966,000	497,000	711,000
Net income	6,000,000	6,687,000	17,455,000	8,864,000	4,779,000	11,639,000	19,451,000	29,009,000	39,006,000	64,878,000	84,608,000
Net income attributable to noncontrolling interests in other partnerships	(1,385,000)	(1,188,000)	(2,067,000)	(1,373,000)	(1,504,000)	(1,653,000)	(3,176,000)	(3,553,000)	(6,013,000)	(9,886,000)	(13,682,000)
Net income attributable to ROP common unitholder	$ 4,615,000	$ 5,499,000	$ 15,388,000	$ 7,491,000	$ 3,275,000	$ 9,986,000	$ 16,275,000	$ 25,456,000	$ 32,993,000	$ 54,992,000	$ 70,926,000

Schedule II-Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Tenant and other receivables - allowance
Changes in valuation allowance
Balance at Beginning of Year	$ 4,667	$ 5,074	$ 4,440
Additions Charged Against Operations	2,805	632	1,522
Uncollectible Accounts Written-off	(164)	(1,039)	(888)
Balance at End of Year	7,308	4,667	5,074
Deferred rent receivable - allowance
Changes in valuation allowance
Balance at Beginning of Year	15,942	13,002	10,872
Additions Charged Against Operations	1,131	3,290	2,719
Uncollectible Accounts Written-off	(572)	(350)	(589)
Balance at End of Year	$ 16,501	$ 15,942	$ 13,002

Schedule III- Real Estate And Accumulated Depreciation (Details) $ in Thousands	Dec. 31, 2012 USD ($)
Real Estate And Accumulated Depreciation
Encumbrances	$ 500,000
Initial Cost
Land	951,484
Building & Improvements	4,157,464
Cost Capitalized Subsequent To Acquisition
Land	3,247
Building & Improvements	283,740
Gross Amount at Which Carried at Close of Period
Land	954,731
Building & Improvements	4,441,204
Total	5,395,935
Accumulated Depreciation	742,659
810 Seventh Avenue
Initial Cost
Land	114,077
Building & Improvements	476,386
Cost Capitalized Subsequent To Acquisition
Building & Improvements	39,315
Gross Amount at Which Carried at Close of Period
Land	114,077
Building & Improvements	515,701
Total	629,778
Accumulated Depreciation	83,226
461 Fifth Avenue
Initial Cost
Building & Improvements	62,695
Cost Capitalized Subsequent To Acquisition
Building & Improvements	6,738
Gross Amount at Which Carried at Close of Period
Building & Improvements	69,433
Total	69,433
Accumulated Depreciation	17,444
750 Third Avenue
Initial Cost
Land	51,093
Building & Improvements	205,972
Cost Capitalized Subsequent To Acquisition
Building & Improvements	30,120
Gross Amount at Which Carried at Close of Period
Land	51,093
Building & Improvements	236,092
Total	287,185
Accumulated Depreciation	54,689
919 Third Avenue
Real Estate And Accumulated Depreciation
Encumbrances	500,000
Initial Cost
Land	223,529
Building & Improvements	1,033,198
Cost Capitalized Subsequent To Acquisition
Building & Improvements	8,084
Gross Amount at Which Carried at Close of Period
Land	223,529
Building & Improvements	1,041,282
Total	1,264,811
Accumulated Depreciation	$ 160,004
Interest in property (as a percent)	51.00%
333 West 34th Street
Initial Cost
Land	$ 36,711
Building & Improvements	146,880
Cost Capitalized Subsequent To Acquisition
Building & Improvements	22,507
Gross Amount at Which Carried at Close of Period
Land	36,711
Building & Improvements	169,387
Total	206,098
Accumulated Depreciation	24,308
555 W. 57th Street
Initial Cost
Land	18,846
Building & Improvements	78,704
Cost Capitalized Subsequent To Acquisition
Building & Improvements	37,612
Gross Amount at Which Carried at Close of Period
Land	18,846
Building & Improvements	116,316
Total	135,162
Accumulated Depreciation	40,143
1185 Avenue of the Americas
Initial Cost
Building & Improvements	728,213
Cost Capitalized Subsequent To Acquisition
Building & Improvements	30,143
Gross Amount at Which Carried at Close of Period
Building & Improvements	758,356
Total	758,356
Accumulated Depreciation	129,505
1350 Avenue of the Americas
Initial Cost
Land	91,038
Building & Improvements	380,744
Cost Capitalized Subsequent To Acquisition
Building & Improvements	22,694
Gross Amount at Which Carried at Close of Period
Land	91,038
Building & Improvements	403,438
Total	494,476
Accumulated Depreciation	66,036
1100 King Street - 1-7 International Drive
Initial Cost
Land	49,392
Building & Improvements	104,376
Cost Capitalized Subsequent To Acquisition
Land	2,473
Building & Improvements	8,795
Gross Amount at Which Carried at Close of Period
Land	51,865
Building & Improvements	113,171
Total	165,036
Accumulated Depreciation	21,597
520 White Plains Road
Initial Cost
Land	6,324
Building & Improvements	26,096
Cost Capitalized Subsequent To Acquisition
Building & Improvements	2,593
Gross Amount at Which Carried at Close of Period
Land	6,324
Building & Improvements	28,689
Total	35,013
Accumulated Depreciation	5,545
115-117 Stevens Avenue
Initial Cost
Land	5,933
Building & Improvements	23,826
Cost Capitalized Subsequent To Acquisition
Building & Improvements	5,177
Gross Amount at Which Carried at Close of Period
Land	5,933
Building & Improvements	29,003
Total	34,936
Accumulated Depreciation	5,703
100 Summit Lake Drive
Initial Cost
Land	10,526
Building & Improvements	43,109
Cost Capitalized Subsequent To Acquisition
Building & Improvements	6,762
Gross Amount at Which Carried at Close of Period
Land	10,526
Building & Improvements	49,871
Total	60,397
Accumulated Depreciation	8,464
200 Summit Lake Drive
Initial Cost
Land	11,183
Building & Improvements	47,906
Cost Capitalized Subsequent To Acquisition
Building & Improvements	3,263
Gross Amount at Which Carried at Close of Period
Land	11,183
Building & Improvements	51,169
Total	62,352
Accumulated Depreciation	8,847
500 Summit Lake Drive
Initial Cost
Land	9,777
Building & Improvements	39,048
Cost Capitalized Subsequent To Acquisition
Building & Improvements	4,183
Gross Amount at Which Carried at Close of Period
Land	9,777
Building & Improvements	43,231
Total	53,008
Accumulated Depreciation	6,701
140 Grand Street
Initial Cost
Land	6,865
Building & Improvements	28,264
Cost Capitalized Subsequent To Acquisition
Building & Improvements	3,557
Gross Amount at Which Carried at Close of Period
Land	6,865
Building & Improvements	31,821
Total	38,686
Accumulated Depreciation	5,503
360 Hamilton Avenue
Initial Cost
Land	29,497
Building & Improvements	118,250
Cost Capitalized Subsequent To Acquisition
Building & Improvements	10,549
Gross Amount at Which Carried at Close of Period
Land	29,497
Building & Improvements	128,799
Total	158,296
Accumulated Depreciation	21,318
7 Landmark Square
Initial Cost
Land	2,088
Building & Improvements	7,748
Cost Capitalized Subsequent To Acquisition
Land	(367)
Building & Improvements	(153)
Gross Amount at Which Carried at Close of Period
Land	1,721
Building & Improvements	7,595
Total	9,316
Accumulated Depreciation	209
680 Washington Boulevard
Initial Cost
Land	11,696
Building & Improvements	45,364
Cost Capitalized Subsequent To Acquisition
Building & Improvements	4,031
Gross Amount at Which Carried at Close of Period
Land	11,696
Building & Improvements	49,395
Total	61,091
Accumulated Depreciation	$ 8,040
Interest in property (as a percent)	51.00%
750 Washington Boulevard
Initial Cost
Land	$ 16,916
Building & Improvements	68,849
Cost Capitalized Subsequent To Acquisition
Building & Improvements	3,995
Gross Amount at Which Carried at Close of Period
Land	16,916
Building & Improvements	72,844
Total	89,760
Accumulated Depreciation	$ 11,962
Interest in property (as a percent)	51.00%
1010 Washington Boulevard
Initial Cost
Land	$ 7,747
Building & Improvements	30,423
Cost Capitalized Subsequent To Acquisition
Building & Improvements	3,354
Gross Amount at Which Carried at Close of Period
Land	7,747
Building & Improvements	33,777
Total	41,524
Accumulated Depreciation	5,447
1055 Washington Boulevard
Initial Cost
Land	13,516
Building & Improvements	53,228
Cost Capitalized Subsequent To Acquisition
Building & Improvements	2,524
Gross Amount at Which Carried at Close of Period
Land	13,516
Building & Improvements	55,752
Total	69,268
Accumulated Depreciation	9,008
400 Summit Lake Drive
Initial Cost
Land	38,889
Cost Capitalized Subsequent To Acquisition
Land	285
Building & Improvements	1
Gross Amount at Which Carried at Close of Period
Land	39,174
Building & Improvements	1
Total	39,175
673 First Ave
Initial Cost
Building & Improvements	35,727
Cost Capitalized Subsequent To Acquisition
Building & Improvements	12,008
Gross Amount at Which Carried at Close of Period
Building & Improvements	47,735
Total	47,735
Accumulated Depreciation	18,538
609 Fifth Avenue
Initial Cost
Land	36,677
Building & Improvements	145,954
Cost Capitalized Subsequent To Acquisition
Building & Improvements	4,640
Gross Amount at Which Carried at Close of Period
Land	36,677
Building & Improvements	150,594
Total	187,271
Accumulated Depreciation	24,420
110 East 42nd Street
Initial Cost
Land	34,000
Building & Improvements	46,411
Cost Capitalized Subsequent To Acquisition
Building & Improvements	4,214
Gross Amount at Which Carried at Close of Period
Land	34,000
Building & Improvements	50,625
Total	84,625
Accumulated Depreciation	3,424
304 Park Avenue
Initial Cost
Land	54,189
Building & Improvements	75,619
Cost Capitalized Subsequent To Acquisition
Land	300
Building & Improvements	1,109
Gross Amount at Which Carried at Close of Period
Land	54,489
Building & Improvements	76,728
Total	131,217
Accumulated Depreciation	1,715
635 Sixth Avenue
Initial Cost
Land	24,179
Building & Improvements	37,158
Cost Capitalized Subsequent To Acquisition
Land	164
Building & Improvements	803
Gross Amount at Which Carried at Close of Period
Land	24,343
Building & Improvements	37,961
Total	62,304
Accumulated Depreciation	234
641 Sixth Avenue
Initial Cost
Land	45,668
Building & Improvements	67,316
Cost Capitalized Subsequent To Acquisition
Land	308
Building & Improvements	430
Gross Amount at Which Carried at Close of Period
Land	45,976
Building & Improvements	67,746
Total	113,722
Accumulated Depreciation	629
Other
Initial Cost
Land	1,128
Cost Capitalized Subsequent To Acquisition
Land	84
Building & Improvements	4,692
Gross Amount at Which Carried at Close of Period
Land	1,212
Building & Improvements	4,692
Total	$ 5,904

Schedule III- Real Estate And Accumulated Depreciation (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Changes in real estate
Balance at beginning of year	$ 5,048,410	$ 4,918,508	$ 4,873,816
Acquisitions	306,280	80,411
Improvements	42,467	54,065	44,891
Retirements/disposals	(1,222)	(4,574)	(199)
Balance at end of year	5,395,935	5,048,410	4,918,508
Aggregate cost of land, buildings and improvements, before depreciation, for Federal income tax purposes	3,100,000
Changes in accumulated depreciation, exclusive of amounts relating to equipment, autos, and furniture and fixtures
Balance at beginning of year	613,543	493,557	375,228
Depreciation for year	130,333	124,010	118,500
Retirements/disposals	(1,217)	(4,024)	(171)
Balance at end of year	$ 742,659	$ 613,543	$ 493,557