Reckson Operating Partnership 10-K 23 Mar 16 2015 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2015	Mar. 22, 2016	Jun. 30, 2015
Document and Entity Information
Entity Registrant Name	RECKSON OPERATING PARTNERSHIP LP
Entity Central Index Key	930,810
Document Type	10-K
Document Period End Date	Dec. 31, 2015
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	2,015
Document Fiscal Period Focus	FY

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Commercial real estate properties, at cost:
Land and land interests	$ 1,877,492	$ 1,776,457
Building and improvements	4,477,073	4,353,081
Building leasehold and improvements	1,073,678	1,073,678
Commercial real estate properties, gross	7,428,243	7,203,216
Less: accumulated depreciation	(1,267,598)	(1,123,412)
Total commercial real estate properties, net	6,160,645	6,079,804
Cash and cash equivalents	50,026	34,691
Restricted cash	39,433	38,844
Tenant and other receivables, net of allowance of $5,593 and $5,820 in 2015 and 2014, respectively	35,256	25,778
Deferred rents receivable, net of allowance of $14,788 and $17,745 in 2015 and 2014, respectively	217,730	199,045
Related party receivable	90,000	0
Debt, preferred equity and other investments, net of discounts and deferred origination fees of $18,759 and $19,172 in 2015 and 2014, respectively	1,770,212	1,508,812
Deferred costs, net of accumulated amortization of $90,168 and $77,594 in 2015 and 2014, respectively	139,638	123,914
Other assets	355,807	292,885
Total assets	8,858,747	8,303,773
Liabilities
Mortgages and other loans payable	753,424	720,000
Revolving credit facility	994,000	385,000
Term loan and senior unsecured notes	1,988,106	1,788,001
Accrued interest payable and other liabilities	134,484	92,815
Accounts payable and accrued expenses	70,844	69,805
Deferred revenue	180,404	130,661
Deferred land leases payable	1,558	1,215
Dividends payable	807	0
Security deposits	39,007	36,195
Total liabilities	4,162,634	3,223,692
Commitments and contingencies	0	0
Preferred units	109,161	0
Capital
General partner capital	4,201,872	4,734,873
Limited partner capital	0	0
Accumulated other comprehensive loss	(2,216)	(3,106)
Total ROP partner's capital	4,199,656	4,731,767
Noncontrolling interests in other partnerships	387,296	348,314
Total capital	4,586,952	5,080,081
Total liabilities and capital	$ 8,858,747	$ 8,303,773

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Tenant and other receivables, allowance	$ 5,593	$ 5,820
Deferred rents receivable, allowance	14,788	17,745
Preferred equity investments, deferred origination fees and discounts	18,759	19,172
Deferred costs, accumulated amortization	$ 90,168	$ 77,594

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenues
Rental revenue, net	$ 621,121	$ 574,150	$ 535,969
Escalation and reimbursement	95,894	92,850	86,366
Investment income	182,648	176,901	194,612
Other income	25,570	3,621	4,875
Total revenues	925,233	847,522	821,822
Expenses
Operating expenses, including $26,728 in 2015, $25,094 in 2014, and $24,302 in 2013 of related party expenses	163,969	154,374	146,548
Real estate taxes	143,873	133,567	118,699
Ground rent	20,941	20,941	21,139
Interest expense, net of interest income	119,342	129,356	133,845
Amortization of deferred financing costs	7,519	7,810	8,460
Depreciation and amortization	202,474	196,505	181,619
Transaction related costs	2,871	3,599	3,070
Marketing, general and administrative	464	372	362
Total expenses	661,453	646,524	613,742
Income from continuing operations before equity in net income (loss) from unconsolidated joint ventures, equity in net gain on sale of interest in unconsolidated joint venture, gain on sale of real estate, depreciable real estate reserves and loss on early extinguishment of debt	263,780	200,998	208,080
Equity in net income (loss) from unconsolidated joint ventures	8,841	4,491	(17,108)
Equity in net gain on sale of interest in unconsolidated joint venture	0	85,559	2,056
Gain on sale of real estate	100,190	0	0
Depreciable real estate reserves	(9,998)	0	0
Loss on early extinguishment of debt	(49)	(7,385)	(76)
Income from continuing operations	362,764	283,663	192,952
Net income from discontinued operations	0	1,996	5,907
Gain on sale of discontinued operations	0	117,579	13,756
Net income	362,764	403,238	212,615
Net income attributable to noncontrolling interests in other partnerships	(9,169)	(2,641)	(5,200)
Preferred units dividend	(1,698)	0	0
Net income attributable to ROP common unitholder	351,897	400,597	207,415
Amounts attributable to ROP common unitholder:
Income from continuing operations	351,897	281,022	187,752
Discontinued operations	$ 0	$ 119,575	$ 19,663

Consolidated Statements of Ope5

Consolidated Statements of Operations (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Statement [Abstract]
Related party expenses included in operating expenses	$ 26,728	$ 25,094	$ 24,302

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Comprehensive Income [Abstract]
Net income attributable to ROP common unitholder	$ 351,897	$ 400,597	$ 207,415
Other comprehensive income:
Change in net unrealized gain on derivative instruments	890	835	914
Comprehensive income attributable to ROP common unitholder	$ 352,787	$ 401,432	$ 208,329

Consolidated Statement of Capit

Consolidated Statement of Capital - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Increase (Decrease) in Partners' Capital
Beginning Balance	$ 5,080,081	$ 4,595,574	$ 4,480,226
Contributions	3,347,260	3,697,533	3,067,104
Distributions	(4,192,345)	(3,617,099)	(3,165,285)
Shares contributed by parent company	(10,000)
Net income	361,066	403,238	212,615
Other comprehensive income	890	835	914
Ending Balance	4,586,952	5,080,081	4,595,574
General Partner's Capital Class A Common Units | Class A Common Units
Increase (Decrease) in Partners' Capital
Beginning Balance	4,734,873	4,248,736	4,127,414
Contributions	3,315,582	3,697,440	3,067,104
Distributions	(4,190,480)	(3,611,900)	(3,153,197)
Shares contributed by parent company	(10,000)
Net income	351,897	400,597	207,415
Ending Balance	4,201,872	4,734,873	4,248,736
Limited Partner's Capital
Increase (Decrease) in Partners' Capital
Beginning Balance	0	0	0
Ending Balance	0	0	0
Noncontrolling Interests In Other Partnerships
Increase (Decrease) in Partners' Capital
Beginning Balance	348,314	350,779	357,667
Contributions	31,678	93
Distributions	(1,865)	(5,199)	(12,088)
Net income	9,169	2,641	5,200
Ending Balance	387,296	348,314	350,779
Accumulated Other Comprehensive (Loss) Income
Increase (Decrease) in Partners' Capital
Beginning Balance	(3,106)	(3,941)	(4,855)
Other comprehensive income	890	835	914
Ending Balance	$ (2,216)	$ (3,106)	$ (3,941)

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Operating Activities
Net income	$ 362,764	$ 403,238	$ 212,615
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	209,993	204,748	194,905
Equity in net gain on sale of interest in unconsolidated joint venture	0	(85,559)	(2,056)
Equity in net income from unconsolidated joint venture	(8,841)	(4,491)	17,108
Distributions of cumulative earnings from unconsolidated joint ventures	8,621	6,269	3,942
Loss on early extinguishment of debt	49	7,385	76
Depreciable real estate reserve	9,998	0	0
Gain on sale of real estate	(100,190)	0	0
Gain on sale of discontinued operations	0	(117,579)	(13,756)
Deferred rents receivable	(21,378)	(23,515)	(22,094)
Other non-cash adjustments	(64,329)	(87,271)	(103,179)
Changes in operating assets and liabilities:
Restricted cash—operations	(1,182)	(4,986)	(6,892)
Tenant and other receivables	(9,900)	(1,238)	4,545
Deferred lease costs	(38,623)	(21,103)	(26,263)
Other assets	14,558	10,710	(330)
Related party payable	0	0	(8,717)
Accounts payable, accrued expenses and other liabilities	2,458	(4,866)	(113)
Deferred revenue and land leases payable	1,487	1,653	4,624
Net cash provided by operating activities	365,485	283,395	254,415
Investing Activities
Acquisitions of real estate property	(109,633)	(517,535)	(386,775)
Additions to land, buildings and improvements	(89,998)	(102,905)	(97,918)
Escrowed cash—capital improvements/acquisition deposits	593	657	(193)
Investments in unconsolidated joint venture	(988)	(59,400)	(13,179)
Distributions in excess of cumulative earnings from unconsolidated joint ventures	28,459	0	19,926
Net proceeds from disposition of real estate/joint venture interest	238,083	237,059	211,048
Other investments	(54,475)	(16,300)	(86,145)
Origination of debt and preferred equity investments	(758,133)	(617,090)	(555,137)
Repayments or redemption of preferred equity investments	520,218	576,927	657,765
Net cash used in investing activities	(225,874)	(498,587)	(250,608)
Financing Activities
Proceeds from mortgages and other loans payable	360,018	221,216	60,172
Repayments of mortgages and other loans payable	(326,594)	(608,539)	(95,950)
Proceeds from credit facility and senior unsecured notes	2,515,000	1,908,000	1,163,938
Repayments of credit facility and senior unsecured notes	(1,706,007)	(1,385,898)	(1,014,000)
Payments of debt extinguishment costs	0	(6,693)	0
Contributions from common unitholder	3,201,654	3,693,440	3,059,766
Contributions to noncontrolling interests in other partnerships	9,400	93	0
Distributions to noncontrolling interests in other partnerships	(1,865)	(5,199)	(12,088)
Distributions to common and preferred unitholder	(4,191,371)	(3,611,900)	(3,153,197)
Deferred loan costs and capitalized lease obligation	(9,511)	(3,681)	(609)
Other obligation related to mortgage loan participation	25,000	0	0
Net cash (used in) provided by financing activities	(124,276)	200,839	8,032
Net increase (decrease) in cash and cash equivalents	15,335	(14,353)	11,839
Cash and cash equivalents at beginning of year	34,691	49,044	37,205
Cash and cash equivalents at end of year	50,026	34,691	49,044
Supplemental Cash Flow Disclosure
Interest paid	118,090	138,574	139,216
Supplemental Disclosure of Non-Cash Investing and Financing Activities:
Tenant improvements and capital expenditures payable	3,441	375	1,479
Deferred leasing payable	7,752	11,127	2,655
Capital leased asset	0	0	10,657
Change in fair value of hedge	570	519	588
Contributions from common unitholder	13,928	4,000	7,338
Deconsolidation of a subsidiary	27,435	0	0
Issuance of SL Green common stock to a consolidated joint venture	10,000	0	0
Contribution of notes receivable from the common unit holder	90,000	0	0
Issuance of preferred units through a subsidiary	109,161	0	0
Contributions from a noncontrolling interest in other partnerships	22,278	0	0
Transfer of financing receivable to debt investment	$ 0	$ 19,675	$ 0

Organization and Basis of Prese

Organization and Basis of Presentation	12 Months Ended
	Dec. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Basis of Presentation	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 Wyoming Acquisition GP LLC., or WAGP, 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. The Operating Partnership is 96.39% owned by SL Green Realty Corp., or SL Green, as of December 31, 2015 . SL Green is a self-administered and self-managed real estate investment trust, and is the sole managing general partner of the Operating Partnership. Unless the context requires otherwise, all references to "we," "our," "us" and the "Company" means ROP and all entities owned or controlled by ROP. ROP is engaged in the acquisition, ownership, management and operation of commercial and residential real estate properties, principally office properties, and also owns land for future development, located in New York City, Westchester County, Connecticut and New Jersey, which collectively is also known as the New York Metropolitan area. 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. 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 2015, SL Green transferred two properties and SL Green's tenancy in common interest in a fee interest with a total value of $395.0 million to ROP. Additionally, in 2015, SL Green transferred one entity that held debt investments and financing receivables with an aggregate carrying value of $1.7 billion to ROP. During 2014 , SL Green transferred five properties with a total value aggregating $884.3 million to ROP. These transfers were made to further diversify ROP's portfolio. Under the business combinations guidance (Accounting Standard Codification, or ASC, 805-50), these transfers were determined to be transfers of businesses between the indirect parent company and its wholly-owned subsidiary. As such, the assets and liabilities of the properties were transferred at their carrying values and were 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 periods have been retrospectively adjusted to furnish comparative information. As of December 31, 2015 , we owned the following interests in properties in the New York Metropolitan area, primarily in midtown Manhattan. Our investments in the New York Metropolitan area also include investments in Brooklyn, Westchester County, Connecticut and New Jersey, which are collectively known as the Suburban properties: Location Type Number of Properties Approximate Square Feet (unaudited) Weighted Average (1) (unaudited) Commercial: Manhattan Office 16 8,463,245 94.9 % Retail (2)(3) 5 352,892 97.6 % Fee Interest 2 197,654 100.0 % 23 9,013,791 95.1 % Suburban Office 19 3,287,800 80.0 % Retail 1 52,000 100.0 % 20 3,339,800 80.3 % Total commercial properties 43 12,353,591 91.1 % Residential: Manhattan Residential (2) — 222,855 89.5 % Total portfolio 43 12,576,446 91.1 % ____________________________________________________________________ (1) The weighted average occupancy for commercial properties represents the total occupied square feet divided by total available rentable square feet. The weighted average occupancy for residential properties represents the total occupied units divided by total available units. (2) As of December 31, 2015 , we owned a building that was comprised of approximately 270,132 square feet (unaudited) of retail space and approximately 222,855 square feet (unaudited) of residential space. For the purpose of this report, we have included the building in the retail properties count and have bifurcated the square footage into the retail and residential components. (3) Includes two unconsolidated joint venture retail properties at 131-137 Spring Street comprised of approximately 68,342 square feet (unaudited). As of December 31, 2015 , we also held debt, preferred equity and other investments with a book value of $1.8 billion .

Significant Accounting Policies

Significant Accounting Policies	12 Months Ended
	Dec. 31, 2015
Accounting Policies [Abstract]
Significant Accounting Policies	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 5, "Debt, Preferred Equity and Other Investments." ROP's investments in majority-owned and controlled real estate joint ventures are reflected in the 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 the primary beneficiary. The primary beneficiary is the entity that has (i) the power to direct the activities that most significantly impact the entity's economic performance and (ii) the obligation to absorb losses of the VIE or the right to receive benefits from the VIE that could be significant to the VIE. A noncontrolling interest in a consolidated subsidiary is defined as the portion of the equity (net assets) in a subsidiary not attributable, directly or indirectly, to us. Noncontrolling interests are required to be presented as a separate component of capital in the consolidated balance sheet and the presentation of net income is modified to present earnings and other comprehensive income attributed to controlling and noncontrolling interests. We assess the accounting treatment for each joint venture and debt and preferred equity investment. This assessment includes a review of each joint venture or limited liability company agreement to determine which party has what rights and whether those rights are protective or participating. For all VIEs, we review such agreements in order to determine which party has the power to direct the activities that most significantly impact the entity's economic performance. In situations where we and our partner approve, among other things, the annual budget, receive a detailed monthly reporting package, meet on a quarterly basis to review the results of the joint venture, review and approve the joint venture's tax return before filing, and approve all leases that cover more than a nominal amount of space relative to the total rentable space at each property, we do not consolidate the joint venture as we consider these to be substantive participation rights that result in shared power of the activities that most significantly impact the performance of the joint venture. Our joint venture agreements typically contain certain protective rights such as requiring partner approval to sell, finance or refinance the property and the payment of capital expenditures and operating expenditures outside of the approved budget or operating plan. Investment in Commercial Real Estate Properties 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. The Company adopted ASU 2014-08 effective January 1, 2015. As a result, the Company classified 140 Grand Street in White Plains, New York as held for sale as of September 30, 2015, and 131-137 Spring Street as of June 30, 2015 and included the results of operations in continuing operations for all periods presented. Discontinued operations included the results of operations of real estate assets sold or held for sale prior to January 1, 2015. This included 673 First Avenue, which was sold during 2014. See Note 4, "Property Dispositions." 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 the capital lease asset) amounted to $187.2 million , $184.3 million and $170.0 million for the years ended December 31, 2015 , 2014 and 2013 , respectively. On a periodic basis, we assess whether there are any indications that the value of our real estate properties may be other than temporarily impaired or that their carrying value may not be recoverable. A property's value is considered impaired if management's estimate of the aggregate future cash flows (undiscounted 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. We also evaluate our real estate properties for potential impairment when a real estate property has been classified as held for sale. Real estate assets held for sale are valued at the lower of either their carrying value or fair value less costs to sell. During the three months ended September 30, 2015, we recorded a $10.0 million charge in connection with the expected sale of one of our properties, which closed in the fourth quarter of 2015. This charge is included in depreciable real estate reserves in the consolidated statements of operations. Prior to the quarter ended September 30, 2015, we do not believe that there were any indicators of impairment at this property. See Note 4, "Property Dispositions." We do not believe that there were any indicators of impairment at any of our consolidated properties at December 31, 2015 . We incur a variety of costs 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 after major construction activity ceases. 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. We recognize the assets acquired, liabilities assumed (including contingencies) and any noncontrolling interests in an acquired entity at their fair values on the acquisition date. We expense transaction costs related to the acquisition of certain assets as incurred, which are included in transaction related costs on our consolidated statements of operations. Results of operations of properties acquired are included in the consolidated statements of operations from the date of acquisition. We allocate the purchase price of real estate to land and building (inclusive of tenant improvements) and, if determined to be material, intangibles, such as the value of above- and below-market leases and origination costs associated with the in-place leases. We depreciate the amount allocated to building (inclusive of tenant improvements) over their estimated useful lives, which generally range from three to 40 years . We amortize the amount allocated to the above- and below-market leases over the remaining term of the associated lease, which generally range from one to 14 years , and record it as either an increase (in the case of below-market leases) or a decrease (in the case of above-market leases) to rental income. We amortize the amount allocated to the values associated with in-place leases over the expected term of the associated lease, which generally ranges from one to 14 years . If a tenant vacates its space prior to the contractual termination of the lease and no rental payments are being made on the lease, any unamortized balance of the related intangible will be written off. The tenant improvements and origination costs are amortized as an expense over the remaining life of the lease (or charged against earnings if the lease is terminated prior to its contractual expiration date). We assess fair value of the leases based on estimated cash flow projections that utilize appropriate discount and capitalization rates and available market information. Estimates of future cash flows are based on a number of factors including the historical operating results, known trends, and market/economic conditions that may affect the property. To the extent acquired leases contain fixed rate renewal options that are below-market and determined to be material, we amortize such below-market lease value into rental income over the renewal period. As of December 31, 2015 , the weighted average amortization period for above-market leases, below-market leases, and in-place lease costs is 4.4 years, 13.3 years, and 11.9 years, respectively. We recognized $24.9 million , $21.0 million , and $19.0 million of rental revenue for the years ended December 31, 2015 , 2014 and 2013 , 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. The increase in rental revenue for the year ended December 31, 2013 is net of $6.8 million resulting from the write-off of balances associated with a former tenant. Excluding this non-recurring charge, we recognized an increase of $25.8 million in rental revenue for the year ended December 31, 2013 for the amortization of aggregate below-market leases in excess of above-market leases and reductions in lease origination costs. In March 2014, we recognized income of $0.3 million for the amortization of the remaining value of below-market rate mortgage at 16 Court Street, Brooklyn, as a result of early repayment of debt. Excluding this one-time income, we recognized as a reduction to interest expense the amortization of the above-market rate mortgages assumed of $2.1 million for the year ended December 31, 2014. We recognized as an increase (a reduction) to interest expense the amortization of the above-market rate mortgages assumed of $0.4 million and $(2.5) million for the years ended December 31, 2015 and 2013, 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, 2015 and 2014 (in thousands): December 31, 2015 December 31, 2014 (as adjusted) Identified intangible assets (included in other assets): Gross amount $ 307,824 $ 297,238 Accumulated amortization (235,040 ) (216,841 ) Net $ 72,784 $ 80,397 Identified intangible liabilities (included in deferred revenue): Gross amount $ 523,228 $ 450,326 Accumulated amortization (346,857 ) (322,694 ) Net $ 176,371 $ 127,632 The estimated annual amortization of acquired below-market leases, net of acquired above-market leases (a component of rental revenue), for each of the five succeeding years is as follows (in thousands): 2016 $ 3,017 2017 4,994 2018 6,548 2019 7,128 2020 6,919 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 (in thousands): 2016 $ 4,600 2017 3,326 2018 2,177 2019 1,751 2020 1,588 Investment in Unconsolidated Joint Ventures We account for our investment in the unconsolidated joint venture under the equity method of accounting in cases where 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 we are determined to be the primary beneficiary in a VIE, these participating rights preclude us from consolidating these 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. Equity in net 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, "Debt, Preferred Equity and Other Investments." We assess our investments in unconsolidated joint ventures for recoverability, and if it is determined that a loss in value of the investment is other than temporary, we write down the investment to its fair value. We evaluate our equity investments for impairment based on the joint venture's projected discounted cash flows. We do not believe that the values of any of our equity investments were impaired at December 31, 2015 . We may originate loans for real estate acquisition, development and construction, where we expect to receive some of the residual profit from such projects. When the risk and rewards of these arrangements are essentially the same as an investor or joint venture partner, we account for these arrangements as real estate investments under the equity method of accounting for investments. Otherwise, we account for these arrangements consistent with our loan accounting for our debt and preferred equity investments. 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, we record amounts funded to construct the tenant improvements as a capital asset. For these tenant improvements, we record amounts reimbursed by tenants as a reduction of the capital asset. When management concludes that the tenant is the owner of tenant improvements for accounting purposes, we record our contribution towards those improvements as a lease incentive, which is included in deferred costs, net on our consolidated balance sheets and amortized as a reduction to rental revenue on a straight-line basis over the term of the lease. The excess of rents recognized over amounts contractually due pursuant to the underlying leases are included in deferred rents receivable on the consolidated balance sheets. We establish, on a current basis, an allowance for future potential tenant credit losses, which may occur against this account. The balance reflected on the consolidated balance sheets is net of such allowance. In addition to base rent, our tenants also generally will pay their pro rata share of increases in real estate taxes and operating expenses for the building over a base year. In some leases, in lieu of paying additional rent based upon increases in building operating expenses, the tenant will pay additional rent based upon increases in the wage rate paid to porters over the porters' wage rate in effect during a base year or increases in the consumer price index over the index value in effect during a base year. In addition, many of our leases contain fixed percentage increases over the base rent to cover escalations. Electricity is most often supplied by the landlord either on a sub-metered basis, or rent inclusion basis (i.e., a fixed fee is included in the rent for electricity, which amount may increase based upon increases in electricity rates or increases in electrical usage by the tenant). Base building services other than electricity (such as heat, air conditioning and freight elevator service during business hours, and base building cleaning) are typically provided at no additional cost, with the tenant paying additional rent only for services which exceed base building services or for services which are provided outside normal business hours. These escalations are based on actual expenses incurred in the prior calendar year. If the expenses in the current year are different from those in the prior year, then during the current year, the escalations will be adjusted to reflect the actual expenses for the current year. We record a gain on sale of real estate when title is conveyed to the buyer, subject to the buyer's financial commitment being sufficient to provide economic substance to the sale and provided that we have no substantial economic involvement with the buyer. Interest income on debt and preferred equity investments is accrued based on the outstanding principal amount and contractual terms of the instruments and when, in the opinion of management, it is deemed collectible. Some debt and preferred equity investments provide for accrual of interest at specified rates, which differ from current payment terms. Interest is recognized on such loans at the accrual rate subject to management's determination that accrued interest is ultimately collectible, based on the underlying collateral and operations of the borrower. If management cannot make this determination, interest income above the current pay rate is recognized only upon actual receipt. Deferred origination fees, original issue discounts and loan origination costs, if any, are recognized as an adjustment to the interest income over the terms of the related investments using the effective interest method. Fees received in connection with loan commitments are also deferred until the loan is funded and are then recognized over the term of the loan as an adjustment to yield. Discounts or premiums associated with the purchase of loans are amortized or accreted into interest income as a yield adjustment on the effective interest method based on expected cashflows through the expected maturity date of the related investment. If we purchase a debt or preferred equity investment at a discount, intend to hold it until maturity and expect to recover the full value of the investment, we accrete the discount into income as an adjustment to yield over the term of the investment. If we purchase a debt or preferred equity investment at a discount with the intention of foreclosing on the collateral, we do not accrete the discount. For debt investments acquired at a discount for credit quality, the difference between contractual cash flows and expected cash flows at acquisition is not accreted. Anticipated exit fees, the collection of which is expected, are also recognized over the term of the loan as an adjustment to yield. Debt and preferred equity investments are placed on a non-accrual status at the earlier of the date at which payments become 90 days past due or when, in the opinion of management, a full recovery of interest income becomes doubtful. Interest income recognition on any non-accrual debt or preferred equity investment is resumed when such non-accrual debt or preferred equity investment becomes contractually current and performance is demonstrated to be resumed. Interest is recorded as income on impaired loans only to the extent cash is received. We may syndicate a portion of the loans that we originate or sell the loans individually. When a transaction meets the criteria for sale accounting, we derecognize the loan sold and recognize gain or loss based on the difference between the sales price and the carrying value of the loan sold. Any related unamortized deferred origination fees, original issue discounts, loan origination costs, discounts or premiums at the time of sale are recognized as an adjustment to the gain or loss on sale, which is included in investment income on the consolidated statements of operations. Any fees received at the time of sale or syndication are recognized as part of investment income. 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 include geographic trends, product diversification, the size of the portfolio and current economic conditions. Based upon these factors, we establish a provision for possible credit loss on each individual investment. When it is probable that we will be unable to collect all amounts contractually due, the investment is considered impaired. Where impairment is indicated on an investment that is held to maturity, a valuation allowance is measured based upon the excess of the recorded investment amount over the net fair value of the collateral. Any deficiency between the carrying amount of an asset and the calculated value of the collateral is charged to expense. We continue to assess or adjust our estimates based on circumstances of a loan and the underlying collateral. If additional information reflects increased recovery of our investment, we will adjust our reserves accordingly. There were no loan reserves recorded during years ended December 31, 2015 , 2014 and 2013 . Debt and preferred equity investments held for sale are carried at the lower of cost or fair market value using available market information obtained through consultation with dealers or other originators of such investments as well as discounted cash flow models based on Level 3 data pursuant to ASC 820-10. As circumstances change, management may conclude not to sell an investment designated as held for sale. In such situations, the investment will be reclassified at its net carrying value to debt and preferred equity investments held to maturity. For these reclassified investments, the difference between the current carrying value and the expected cash to be collected at maturity will be accreted into income over the remaining term of the investment. 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 leases payable on the consolidated balance sheets. Income Taxes ROP is a partnership and, as a result, all income and losses of the partnership are allocated to the partners for inclusion in their respective income tax returns. No provision has been made for income taxes in the consolidated financial statements since such taxes, if any, are the responsibility of the individual partners. We follow a two-step approach for evaluating uncertain tax positions. Recognition (step one) occurs when an enterprise concludes that a tax position, based solely on its technical merits, is more-likely-than-not to be sustained upon examination. Measurement (step two) determines the amount of benefit that is more-likely-than-not to be realized upon settlement. Derecognition of a tax position that was previously recognized would occur when a company subsequently determines that a tax position no longer meets the more-likely-than-not threshold of being sustained. The use of a valuation allowance as a substitute for derecognition of tax positions is prohibited. Shares Contributed by Parent Company We present shares of SL Green common stock as a contra-equity account in our financial statements. 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 our 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 may be 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. Fair Value Measurements See Note 10, "Fair Value Measurements." Derivative Instruments In the normal course of business, we use a variety of commonly used derivative instruments, such as interest rate swaps, caps, collar and floors, to manage, or hedge, interest rate risk. Effectiveness is essential for those derivatives that we intend to qualify 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. Earnings per Unit Earnings per unit was not computed in 2015 , 2014 and 2013 as there were no outstanding common units held by third parties at December 31, 2015 , 2014 and 2013 . Use of Estimates The pr

Property Acquisition

Property Acquisition	12 Months Ended
	Dec. 31, 2015
Business Combinations [Abstract]
Property Acquisition	Property Acquisitions 2015 Acquisition In July 2015, we acquired the fee interest at 110 Greene Street for $255.0 million . We are currently in the process of analyzing the purchase price allocation and, as such, we have not allocated any value to intangible assets such as above-and below-market lease or in-place leases. We acquired a 90.0% controlling interest in this property for consideration that included the issuance of $5.0 million and $6.7 million aggregate liquidation preferences of Series P and Q Preferred Units, respectively, of limited partnership interest of the Operating Partnership and cash. 2014 Acquisitions During the year ended December 31, 2015, we finalized the purchase price allocation based on third party appraisal and additional facts and circumstances that existed at the acquisition dates for the following 2014 acquisitions (in thousands): 102 Greene (1) 635 Madison Ave (1) 115 Spring Street (1) Acquisition Date October 2014 September 2014 July 2014 Ownership Type Fee Interest Fee Interest Fee Interest Property Type Retail Land Retail Purchase Price Allocation: Land $ 8,215 $ 205,632 $ 11,078 Building and building leasehold 26,717 15,805 44,799 Above-market lease value — — — Acquired in-place lease value 1,015 17,345 2,037 Other assets, net of other liabilities 3 — — Assets acquired 35,950 238,782 57,914 Mark-to-market assumed debt — — — Below-market lease value 3,701 85,036 4,789 Liabilities assumed 3,701 85,036 4,789 Purchase price $ 32,249 $ 153,746 $ 53,125 Net consideration funded by us at closing, excluding consideration financed by debt $ 32,249 $ 153,746 $ 53,125 Equity and/or debt investment held $ — $ — $ — Debt assumed $ — $ — $ — ____________________________________________________________________ (1) Based on our preliminary analysis of the purchase price, we had allocated $11.3 million and $21.0 million to land and building, respectively, at 102 Greene Street, $153.7 million to land at 635 Madison Avenue, and $15.9 million and $37.2 million to land and building, respectively, at 115 Spring Street. The impact to our consolidated statement of operations for the year ended December 31, 2015 was $1.9 million in rental revenue for the amortization of aggregate below-market leases and $1.1 million of depreciation expense. During the year ended December 31, 2013, the properties listed below were acquired from third parties. The following summarizes our allocation of the purchase price of the assets acquired and liabilities assumed upon the closing of these acquisitions (in thousands): 315 West 33rd Street (1) 16 Court Street (2) Acquisition Date November 2013 April 2013 Ownership Type Fee Interest Fee Interest Property Type Residential Office Purchase Price Allocation: Land $ 195,834 $ 19,217 Building and building leasehold 164,429 63,210 Above-market lease value 7,084 5,122 Acquired in-place lease value 26,125 9,422 Other assets, net of other liabilities 1,142 3,380 Assets acquired 394,614 100,351 Mark-to-market assumed debt — 294 Below-market lease value 7,839 3,885 Liabilities assumed 7,839 4,179 Purchase price $ 386,775 $ 96,172 Net consideration funded by us at closing, excluding consideration financed by debt $ 386,775 $ 4,000 Equity and/or debt investment held $ — $ 11,535 Debt assumed $ — $ 84,642 ____________________________________________________________________ (1) During the year ended December 31, 2014, we finalized the purchase price allocation based on a third party appraisal and additional facts and circumstances that existed at the acquisition dates. These adjustments did not have a material impact to our consolidated statement of operations for the year ended December 31, 2014. (2) This property was transferred from SL Green in 2014. See Note 1, "Organization and Basis of Presentation," for further discussion. In April 2013, we acquired interests from our joint venture partner, City Investment Fund, in 16 Court Street in Brooklyn for $4.0 million . We have consolidated the ownership of the building. The transaction valued the consolidated interest at $96.2 million , inclusive of the $84.6 million mortgage encumbering the property. In April 2014, we repaid the mortgage.

Property Dispositions

Property Dispositions	12 Months Ended
	Dec. 31, 2015
Discontinued Operations and Disposal Groups [Abstract]
Property Dispositions	Property Dispositions The following table summarizes the properties sold during the years ended December 31, 2015 , 2014 and 2013: Property Disposition Date Property Type Approximate Usable Square Feet (unaudited) Sale Price (1) (in millions) Gain (loss) on Sale (2) (in millions) 140 Grand Street (3) December 2015 Office 130,100 $ 22.4 $ (10.5 ) 131-137 Spring Street (4) August 2015 Office 68,342 $ 277.8 $ 101.1 673 First Avenue May 2014 Office 422,000 $ 145.0 $ 117.6 333 West 34th Street August 2013 Office 345,400 $ 220.3 $ 13.8 ____________________________________________________________________ (1) Sales price represents the actual sales price for the property or the gross asset valuation for the interest in a property. (2) The gain on sale for 131-137 Spring Street, 673 First Avenue and 333 West 34th Street are net of $4.1 million , $3.4 million and $3.0 million , respectively, in employee compensation awards accrued in connection with the realization of these investment gains as a bonus to certain employees that were instrumental in realizing the gain on sale. Additionally, amounts do not include adjustments for expenses recorded in subsequent periods. (3) Gain/(loss) on sale includes a $10.0 million charge that was recorded during the third quarter of 2015. This charge is included in depreciable real estate reserves in the consolidated statement of operations. (4) We sold an 80% interest in 131-137 Spring Street and have subsequently accounted for our interest in the properties as an investment in unconsolidated joint ventures. See Note 5, "Debt, Preferred Equity and Other Investments." Discontinued Operations The Company adopted ASU 2014-08 effective January 1, 2015. As a result, the Company classified 140 Grand Street in White Plains, New York as held for sale as of September 30, 2015 and 131-137 Spring Street as of June 30, 2015, and included the results of operations in continuing operations for all periods presented. Discontinued operations included the results of operations of real estate assets sold or held for sale prior to January 1, 2015. This included 673 First Avenue, which was sold in May 2014 and 333 West 34th Street, which was sold in August 2013. There were no discontinued operations for the year ended December 31, 2015 . The following table summarizes net income from discontinued operations for the years ended December 31, 2014 and 2013 (in thousands): Year Ended December 31, 2014 2013 Revenues Rental revenue $ 7,853 $ 28,843 Escalation and reimbursement revenues 1,080 4,093 Other income — 8 Total revenues 8,933 32,944 Operating expenses 1,222 6,733 Real estate taxes 1,402 4,571 Ground rent 3,001 7,974 Interest expense, net of interest income 879 2,933 Depreciation and amortization 433 4,826 Total expenses 6,937 27,037 Net income from discontinued operations $ 1,996 $ 5,907

Debt, Preferred Equity and Othe

Debt, Preferred Equity and Other Investments	12 Months Ended
	Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract]
Debt, Preferred Equity and Other Investments	Debt, Preferred Equity and Other Investments During the years ended December 31, 2015 and 2014 , our debt and preferred equity investments, net of discounts and deferred origination fees, increased $781.4 million and $680.1 million , respectively, due to originations, purchases, advances under future funding obligations, discount and fee amortization, and paid-in-kind interest, net of premium amortization. We recorded repayments, participations and sales of $520.2 million and $576.1 million during the years ended December 31, 2015 and 2014 , respectively, which offset the increases in debt and preferred equity investments. Debt Investments As of December 31, 2015 and 2014 , we held the following debt investments with an aggregate weighted average current yield of 10.23% at December 31, 2015 (in thousands): Loan Type December 31, 2015 Future Funding Obligations December 31, 2015 Senior Financing December 31, 2015 Carrying Value (1) December 31, 2014 Carrying Value (1) Initial Maturity Date (as adjusted) Fixed Rate Investments: Jr. Mortgage Participation/ Mezzanine Loan (2)(3) $ — $ — $ 23,510 $ 45,611 May 2016 Jr. Mortgage Participation — 133,000 49,000 49,000 June 2016 Mezzanine Loan — 115,000 24,916 24,910 July 2016 Mezzanine Loan — 165,000 72,102 71,656 November 2016 Jr. Mortgage Participation/Mezzanine Loan — 1,109,000 104,661 98,934 March 2017 Mezzanine Loan (3) — — 66,183 65,770 March 2017 Mezzanine Loan (4) — 502,100 41,115 24,608 June 2017 Loan Type December 31, 2015 Future Funding Obligations December 31, 2015 Senior Financing December 31, 2015 Carrying Value (1) December 31, 2014 Carrying Value (1) Initial Maturity Date (as adjusted) Mezzanine Loan — 539,000 49,691 49,629 July 2018 Mortgage Loan (5) — — 26,262 26,209 February 2019 Mortgage Loan — — 513 637 August 2019 Mezzanine Loan — 15,000 3,500 3,500 September 2021 Mezzanine Loan (6) — 89,880 19,936 19,930 November 2023 Mezzanine Loan — 95,000 30,000 30,000 January 2025 Mezzanine Loan (7) — — — 14,068 Jr. Mortgage Participation (8) — — — 11,934 Jr. Mortgage Participation (9) — — — 70,688 Total fixed rate $ — $ 2,762,980 $ 511,389 $ 607,084 Floating Rate Investments: Mezzanine Loan (10) — 775,000 74,700 73,402 March 2016 Mortgage/Mezzanine Loan 10,156 — 94,901 — April 2016 Mezzanine Loan (11) — 160,000 22,625 22,573 June 2016 Mezzanine Loan 7,942 312,939 66,398 — November 2016 Mezzanine Loan — 360,000 99,530 99,023 November 2016 Mezzanine Loan (12) 11,414 131,939 49,751 42,750 December 2016 Mezzanine Loan 281 39,201 13,731 11,835 December 2016 Mortgage/Mezzanine Loan (13) 57,108 — 134,264 — January 2017 Mezzanine Loan 1,293 118,949 28,551 20,651 January 2017 Mortgage/Mezzanine Loan — — 68,977 — June 2017 Jr. Mortgage Participation/Mezzanine Loan 1,257 118,717 40,346 38,524 July 2017 Mortgage/Mezzanine Loan — — 22,877 22,803 July 2017 Mortgage/Mezzanine Loan — — 16,901 16,848 September 2017 Mortgage/Mezzanine Loan 4,500 — 19,282 — October 2017 Mezzanine Loan — 60,000 14,904 14,859 November 2017 Mezzanine Loan — 85,000 29,505 — December 2017 Mezzanine Loan — 65,000 28,563 — December 2017 Mortgage/Mezzanine Loan (14) 795 — 14,942 14,845 December 2017 Jr. Mortgage Participation — 40,000 19,846 — April 2018 Mezzanine Loan — 175,000 34,725 — April 2018 Jr. Mortgage Participation/Mezzanine Loan — 55,000 20,510 20,533 July 2018 Mortgage/Mezzanine Loan (15) 1,500 — 31,210 — August 2018 Mezzanine Loan — 33,000 26,777 — December 2018 Mezzanine Loan 6,383 156,383 52,774 — December 2018 Mezzanine Loan 28,801 206,717 49,625 — December 2018 Mortgage/Mezzanine Loan — — 18,395 18,083 February 2019 Mezzanine Loan — 38,000 21,845 21,807 March 2019 Mezzanine Loan (16) — — — 33,726 Mezzanine Loan (16) — — — 37,322 Mortgage/Mezzanine Loan (17) — — — 109,527 Loan Type December 31, 2015 Future Funding Obligations December 31, 2015 Senior Financing December 31, 2015 Carrying Value (1) December 31, 2014 Carrying Value (1) Initial Maturity Date (as adjusted) Mezzanine Loan (18) — — — 49,614 Total floating rate $ 131,430 $ 2,930,845 $ 1,116,455 $ 668,725 Total $ 131,430 $ 5,693,825 $ 1,627,844 $ 1,275,809 ____________________________________________________________________ (1) Carrying value is net of discounts, premiums, original issue discounts and deferred origination fees. (2) The $22.9 million junior mortgage participation, which matures in February 2016, was sold in July 2015. (3) These loans are collateralized by defeasance securities. (4) Carrying value is net of $41.3 million that was participated out, which is included in other assets and other liabilities on the consolidated balance sheets as a result of the transfer not meeting the conditions for sale accounting. (5) In September 2014, we acquired a $26.4 million mortgage loan at a $0.2 million discount and a $5.7 million junior mortgage participation at a $5.7 million discount. The junior mortgage participation was a nonperforming loan at acquisition and is currently on non-accrual status. (6) Carrying value is net of $5.0 million that was participated out, which is included in other assets and other liabilities on the consolidated balance sheets as a result of the transfer not meeting the conditions for sale accounting. (7) This loan was repaid in February 2015. (8) This loan was repaid in March 2015. (9) These loans were repaid in December 2015. (10) In March 2016, the maturity date was extended to September 2016. (11) Carrying value is net of $7.4 million that was participated out, which is included in other assets and other liabilities on the consolidated balance sheets as a result of the transfer not meeting the conditions for sale accounting. (12) In February 2015, the maturity date was extended to December 2016. (13) Carrying value is net of $25.0 million that was participated out, which is included in other assets and other liabilities on the consolidated balance sheets as a result of the transfer not meeting the conditions for sale accounting. (14) Carrying value is net of $5.1 million that was participated out, which is included in other assets and other liabilities on the consolidated balance sheets as a result of the transfer not meeting the conditions for sale accounting. (15) In January 2016, the loans were modified and the mortgage was sold. (16) These loans were repaid in April 2015. (17) This loan was repaid in August 2015. (18) This loan was repaid in November 2015. Preferred Equity Investments As of December 31, 2015 and 2014 , we held the following preferred equity investments, with an aggregate weighted average current yield of 7.86% at December 31, 2015 (in thousands): Type December 31, 2015 Future Funding Obligations December 31, 2015 Senior Financing December 31, 2015 Carrying Value (1) December 31, 2014 (1) Initial Mandatory Redemption Preferred equity (2) $ — $ 71,486 $ 9,967 $ 9,954 March 2018 Preferred equity 5,580 60,183 32,209 — November 2018 Preferred equity (3) — — — 123,041 $ 5,580 $ 131,669 $ 42,176 $ 132,995 ____________________________________________________________________ (1) Carrying value is net of deferred origination fees. (2) In March 2015, the redemption date was extended to March 2018. (3) This investment was redeemed in July 2015. The following table is a rollforward of our total loan loss reserves at December 31, 2015 , 2014 and 2013 (in thousands): Year Ended December 31, 2015 2014 2013 Balance at beginning of year $ — $ 1,000 $ 7,000 Expensed — — — Recoveries — — — Charge-offs and reclassifications — (1,000 ) (6,000 ) Balance at end of period $ — $ — $ 1,000 At December 31, 2015 and 2014 , all debt and preferred equity investments were performing in accordance with the terms of the relevant investments, with the exception of a junior mortgage participation acquired in September 2014, which has a carrying value of zero . We have determined that we have one portfolio segment of financing receivables at December 31, 2015 and 2014 comprising commercial real estate which is primarily recorded in debt and preferred equity investments. Included in other assets is an additional amount of financing receivables totaling $168.3 million and $107.0 million at December 31, 2015 and 2014 , respectively. No financing receivables were 90 days past due at December 31, 2015 . Other Investments Other investments pertain to investments accounted for under the equity method of accounting. We have one debt and preferred equity investment which meets the criteria of a real estate investment under the guidance for Acquisition, Development and Construction arrangements and have accounted for this wholly owned investment under the equity method of accounting. As of December 31, 2015 and 2014 , the book value of this investment was $100.2 million and $100.0 million , respectively. In January 2016 the maturity date of this investment was extended from March 2016 to March 2017, subject to two remaining one -year extension options and a two -year option for the last extension. During the three months ended March 31, 2014, we sold our 43.74% economic ownership interest in the joint venture which holds the West Coast Office portfolio at an implied gross valuation of $756.0 million , inclusive of the $526.3 million mortgage encumbering the property. We recognized a gain of $85.6 million on the sale of our investment. As of December 31, 2015 , we have one investment in a real estate joint venture in which we do not control as a result of the level of our voting interest. The following table provides general information on our joint venture as of December 31, 2015 : Property Partner Ownership Interest Economic Interest Approximate Square Feet (unaudited) Acquisition Date Acquisition Price (1) (in thousands) 131-137 Spring Street (2) Invesco Real Estate 20% 20% 68,342 August 2015 $ 277,750 __________________________________________________________________ (1) Acquisition price represents the actual or implied gross purchase price for the joint venture, which is not adjusted for subsequent acquisitions of additional interest. (2) In August 2015, we sold an 80% interest in 131-137 Spring Street and through the joint venture obtained a $141.0 million 5 -year, floating rate mortgage financing, which bears interest at 155 basis points over the 30-day LIBOR. These properties, which were previously wholly-owned, were accounted for in commercial real estate properties on the consolidated balance sheet. See Note 4, "Property Dispositions."

Mortgages and Other Loans Payab

Mortgages and Other Loans Payable	12 Months Ended
	Dec. 31, 2015
Mortgage Note and Other Loans Payable
Mortgages and Other Loans Payable	Mortgages and Other Loans Payable The first mortgages and other loans payable collateralized by either the respective properties and assignment of leases or certain debt investments at December 31, 2015 and 2014 , respectively, were as follows (amounts in thousands): Property Maturity Date Interest Rate (1) December 31, 2015 December 31, 2014 Fixed Rate Debt: (as adjusted) 919 Third Avenue (2) June 2023 5.12 % $ 500,000 $ 500,000 711 Third Avenue (3) — 120,000 Total fixed rate debt 500,000 620,000 Floating Rate Debt: Master Repurchase Agreement June 2016 3.36 % $ 253,424 $ 100,000 Total floating rate debt 253,424 100,000 Total fixed and floating rate debt $ 753,424 $ 720,000 ____________________________________________________________________ (1) Effective weighted average interest rate for the year ended December 31, 2015 . (2) We own a 51.0% controlling interest in the joint venture that is the borrower on this loan. (3) In March 2015, we repaid the mortgage. Master Repurchase Agreement The Master Repurchase Agreement, as amended in December 2013, or MRA, provides us with the ability to sell certain debt investments with a simultaneous agreement to repurchase the same at a certain date or on demand. This MRA has a maximum facility capacity of $300.0 million and bears interest ranging from 250 basis points and 325 basis points over 30-day LIBOR depending on the pledged collateral. In September 2015, we entered into an amendment to the MRA to extend the maturity to June 29, 2016. Further, as of December 6, 2015 we are now required to pay monthly in arrears a 25 basis point fee on the excess of $150.0 million over the average daily balance during the period if the average daily balance is less than $150.0 million . We seek to mitigate risks associated with our repurchase agreement by managing the credit quality of our assets, early repayments, interest rate volatility, liquidity, and market value. The margin call provisions under our repurchase facility permit valuation adjustments based on capital markets activity, and are not limited to collateral-specific credit marks. To monitor credit risk associated with our debt investments, our asset management team regularly reviews our investment portfolio and is in contact with our borrowers in order to monitor the collateral and enforce our rights as necessary. The risk associated with potential margin calls is further mitigated by our ability to recollateralize the facility with additional assets from our portfolio of debt investments, our ability to satisfy margin calls with cash or cash equivalents and access to additional liquidity through the 2012 Credit Facility. See Note 7, "Corporate Indebtedness." At December 31, 2015 and 2014 , the gross book value of the properties and debt and preferred equity investments collateralizing the mortgages and other loans payable was approximately $2.0 billion and $1.9 billion , respectively.

Corporate Indebtedness

Corporate Indebtedness	12 Months Ended
	Dec. 31, 2015
Debt Disclosure [Abstract]
Corporate Indebtedness	Corporate Indebtedness 2012 Credit Facility In July 2015, we entered into the third amendment to the credit facility that was originally entered into by the Company in November 2012, referred to as the 2012 credit facility, which increased our unsecured corporate facility by $500.0 million . The revolving credit facility was increased by $400.0 million to $1.6 billion and the term loan portion of the facility was increased by $100.0 million to $933.0 million . In January 2015, we amended the 2012 credit facility by entering into a second amended and restated credit agreement, which decreased the interest-rate margin and facility fee applicable to the revolving credit facility by 20 basis points and five basis points , respectively, and extended the maturity date of the revolving credit facility to March 29, 2019 with an as-of-right extension through March 29, 2020. In November 2014, we increased the term loan portion of the facility by $50.0 million to $833.0 million . In March 2014, we entered into an amendment to the 2012 credit facility, which among other things, increased the term loan portion of the facility by $383.0 million to $783.0 million , decreased the interest-rate margin applicable to the term loan portion of the facility by 25 basis points and extended the maturity of the term loan portion of the facility from March 30, 2018 to June 30, 2019. As of December 31, 2015 , the 2012 credit facility, as amended, consisted of a $1.6 billion revolving credit facility, or the revolving credit facility, and a $933.0 million term loan, or the term loan facility. We also have an option, subject to customary conditions, to increase the capacity under the revolving credit facility to $3.0 billion at any time prior to the maturity date for the revolving credit facility without the consent of existing lenders, by obtaining additional commitments from our existing lenders and other financial institutions. As of December 31, 2015 , the 2012 credit facility bore interest at a spread over LIBOR ranging from (i) 87.5 basis points to 155 basis points for loans under the revolving credit facility and (ii) 95 basis points to 190 basis points for loans under the term loan facility, in each case based on the credit rating assigned to the senior unsecured long term indebtedness of ROP. At December 31, 2015 , the applicable spread was 125 basis points for revolving credit facility and 140 basis points for the term loan facility. At December 31, 2015 , the effective interest rate was 1.45% for the revolving credit facility and 1.67% for the term loan facility. We are required to pay quarterly in arrears a 12.5 basis points to 30 basis point facility fee on the total commitments under the revolving credit facility based on the credit rating assigned to the senior unsecured long term indebtedness of ROP. As of December 31, 2015 , the facility fee was 25 basis points . As of December 31, 2015 , we had $73.1 million of outstanding letters of credit, $994.0 million drawn under the revolving credit facility and $933.0 million outstanding under the term loan facility, with total undrawn capacity of $532.9 million under the 2012 credit facility. We, SL Green and the Operating Partnership are all borrowers jointly and severally obligated under the 2012 credit facility. None of SL Green's other subsidiaries are obligors under the 2012 credit facility. The 2012 credit facility includes certain restrictions and covenants (see Restrictive Covenants below). Senior Unsecured Notes The following table sets forth our senior unsecured notes and other related disclosures as of December 31, 2015 and 2014 , respectively, by scheduled maturity date (dollars in thousands): Issuance December 31, 2015 December 31, 2015 December 31, 2014 Coupon Rate (1) Effective Rate Term (in Years) Maturity Date March 31, 2006 (2) $ 255,308 $ 255,296 $ 255,250 6.00 % 6.00 % 10 March 31, 2016 August 5, 2011 (3) 250,000 249,810 249,744 5.00 % 5.00 % 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) 200,000 200,000 200,000 4.50 % 4.50 % 10 December 1, 2022 December 15, 2015 (3) 100,000 100,000 — 4.27 % 4.27 % 10 December 17, 2025 June 27, 2005 (4) — — 7 $ 1,055,308 $ 1,055,106 $ 955,001 ______________________________________________________________________ (1) Interest on the senior unsecured notes is payable semi-annually with principal and unpaid interest due on the scheduled maturity dates. (2) The notes will be repaid at maturity. (3) Issued by SL Green, the Operating Partnership and ROP, as co-obligors. (4) In April 2015, we redeemed the remaining outstanding debentures. 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, as amended, 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 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, 2015 and 2014 , we were in compliance with all such covenants. Principal Maturities Combined aggregate principal maturities of our mortgage and other loans payable, 2012 credit facility and senior unsecured notes as of December 31, 2015 , including as-of-right extension options and put options, were as follows (in thousands): Scheduled Amortization Principal Repayments Revolving Credit Facility Unsecured Term Loan Senior Unsecured Notes Total 2016 $ 3,566 $ 253,424 $ — $ — $ 255,308 $ 512,298 2017 7,411 — — — — 7,411 2018 7,799 — — — 250,000 257,799 2019 8,207 — — 933,000 — 941,207 2020 8,637 — 994,000 — 250,000 1,252,637 Thereafter 22,786 441,594 — — 300,000 764,380 $ 58,406 $ 695,018 $ 994,000 $ 933,000 $ 1,055,308 $ 3,735,732 Consolidated interest expense, excluding capitalized interest, was comprised of the following (in thousands): Year Ended December 31, 2015 2014 2013 (as adjusted) (as adjusted) Interest expense $ 119,360 $ 129,427 $ 133,853 Interest income (18 ) (71 ) (8 ) Interest expense, net $ 119,342 $ 129,356 $ 133,845 Interest capitalized $ 1,107 $ 3,753 $ —

Preferred Units

Preferred Units	12 Months Ended
	Dec. 31, 2015
Equity [Abstract]
Preferred Units	Preferred Units Through a consolidated subsidiary, we have authorized up to 109,161 3.5% Series A Preferred Units of limited partnership interest, or the Greene Series A Preferred Units, with a liquidation preference of $1,000.00 per unit. In August 2015, the Company issued 109,161 Greene Series A Preferred Units in conjunction with an acquisition. The Greene Series A Preferred unitholders receive annual dividends of $35.00 per unit paid on a quarterly basis and dividends are cumulative, subject to certain provisions. The Greene Series A Preferred Units can be redeemed at any time, at the option of the unitholder, either for cash or are convertible on a one-for-one basis, into the Series B Preferred Units of limited partnership interest, or the Greene Series B Preferred Units. The Greene Series B Preferred Units can be converted at any time, at the option of the unitholder, into a number of common stock equal to 6.71348 shares of SL Green common stock for each Greene Series B Preferred Unit. As of December 31, 2015 , no Greene Series B Preferred Units have been issued. ASC 815 Derivatives and Hedging requires bifurcation of certain embedded derivative instruments, such as conversion features in convertible equity instruments, and their measurement at fair value for accounting purposes. The conversion feature embedded in the Greene Series A Preferred Units was evaluated, and it was determined that the conversion feature should be bifurcated from its host instrument and accounted for as a freestanding derivative. The derivative is reported as a derivative liability in accrued interest and other liabilities on the accompanying consolidated balance sheet and is adjusted to its fair value at each reporting date, with a corresponding adjustment to interest expense, net of interest income. The embedded derivative for the Greene Series A Preferred Units was initially recorded at a fair value of zero on July 22, 2015, the date of issuance. At December 31, 2015, the carrying amount of the derivative was adjusted to its fair value of zero , with a corresponding adjustment to preferred units and interest expense, net of interest income.

Partners' Capital

Partners' Capital	12 Months Ended
	Dec. 31, 2015
Partners' Capital Notes [Abstract]
Partners' Capital	Partners' 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.

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2015
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements We are required to disclose fair value information with regard to our financial instruments, whether or not recognized in the consolidated balance sheets, for which it is practical to estimate fair value. The FASB guidance defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants on the measurement date. We measure and/or disclose the estimated fair value of financial assets and liabilities based on a hierarchy that distinguishes between market participant assumptions based on market data obtained from sources independent of the reporting entity and the reporting entity’s own assumptions about market participant assumptions. This hierarchy consist of three broad levels: Level 1 - quoted prices (unadjusted) in active markets for identical assets or liabilities that the reporting entity can access at the measurement date; Level 2 - inputs other than quoted prices included within Level 1, that are observable for the asset or liability, either directly or indirectly; and Level 3 - unobservable inputs for the asset or liability that are used when little or no market data is available. We follow this hierarchy for our assets and liabilities measured at fair value on a recurring and nonrecurring basis. In instances in which the determination of the fair value measurement is based on inputs from different levels of the fair value hierarchy, the level in the fair value hierarchy within which the entire fair value measurement falls is based on the lowest level of input that is significant to the fair value measurement in its entirety. Our assessment of the significance of the particular input to the fair value measurement in its entirety requires judgment and considers factors specific to the asset or liability. We determine other than temporary impairment in real estate investments and debt and preferred equity investments, including intangibles utilizing cash flow projections that apply, among other things, estimated revenue and expense growth rates, discount rates and capitalization rates, which are classified as Level 3 inputs. The fair value of derivative instruments is based on current market data received from financial sources that trade such instruments and are based on prevailing market data and derived from third party proprietary models based on well-recognized financial principles and reasonable estimates about relevant future market conditions, which are classified as Level 2 inputs. The financial assets and liabilities that are not measured at fair value on our consolidated balance sheets include cash and cash equivalents, restricted cash, accounts receivable, accounts payable and accrued expenses, debt and preferred equity investments, mortgages and other loans payable and other secured and unsecured debt. The carrying amount of cash and cash equivalents, restricted cash, accounts receivable, and accounts payable and accrued expenses reported in our consolidated balance sheets approximates fair value due to the short term nature of these instruments. The fair value of debt and preferred equity investments, which is classified as Level 3, is estimated by discounting the future cash flows using current interest rates at which similar loans with the same maturities would be made to borrowers with similar credit ratings. The fair value of borrowings, which is classified as Level 3, is estimated by discounting the contractual cash flows of each debt instrument to their present value using adjusted market interest rates, which is provided by a third-party specialist. The following table provides the carrying value and fair value of these financial instruments as of December 31, 2015 and 2014 (in thousands): December 31, 2015 December 31, 2014 Carrying Value Fair Value Carrying Value Fair Value (as adjusted) (as adjusted) Debt and preferred equity investments $ 1,670,020 (1) (2) $ 1,408,804 (1) (2) Fixed rate debt $ 1,585,106 $ 1,663,078 $ 1,605,001 $ 1,737,673 Variable rate debt 2,150,424 2,164,673 1,288,000 1,331,177 $ 3,735,530 $ 3,827,751 $ 2,893,001 $ 3,068,850 ______________________________________________________________________ (1) Excludes one investment with a book value of $100.2 million and $100.0 million as of December 31, 2015 and 2014 , respectively, which we accounted for under the equity method accounting as a result of meeting the criteria of a real estate investment under the guidance for Acquisition, Development and Construction arrangements, and other investments with a book value of $168.3 million and $107.0 million as of December 31, 2015 and 2014 , respectively. (2) At December 31, 2015 , debt and preferred equity investments had an estimated fair value ranging between $1.7 billion and $1.8 billion . At December 31, 2014 , debt and preferred equity investments had an estimated fair value ranging between $1.5 billion and $1.8 billion . Disclosure about fair value of financial instruments was based on pertinent information available to us as of December 31, 2015 and December 31, 2014 . 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.

Financial Instruments_ Derivati

Financial Instruments: Derivatives and Hedging	12 Months Ended
	Dec. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Financial Instruments: Derivatives and Hedging	Financial Instruments: Derivatives and Hedging In the normal course of business, we use a variety of commonly used derivative instruments, such as interest rate swaps, caps, collar and floors, to manage, or hedge interest rate risk. We hedge our exposure to variability in future cash flows for forecasted transactions in addition to anticipated future interest payments on existing debt. We recognize all derivatives on the balance sheets at fair value. Derivatives that are not hedges are adjusted to fair value through earnings. If a derivative is a hedge, depending on the nature of the hedge, changes in the fair value of the derivative will either be offset against the change in fair value of the hedge asset, liability, or firm commitment through earnings, or recognized in other comprehensive income until the hedged item is recognized in earnings. The ineffective portion of a derivative's change in fair value will be immediately recognized in earnings. Reported net income and 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. Currently, all of our designated derivative instruments are effective hedging instruments. As of December 31, 2015 , the Company had designated an interest swap agreement on $30.0 million of the 2012 credit facility. The following table summarizes the notional and fair value of our derivative financial instrument at December 31, 2015 based on Level 2 inputs. The notional value is an indication of the extent of our involvement in that instrument at that time, but does not represent exposure to credit, interest rate or market risks. Notional Value Strike Rate Effective Date Expiration Date Balance Sheet Location Fair Value Interest Rate Swap $30,000 2.295% July 2010 June 2016 Other Liabilities $ (241 ) Gains and losses on terminated hedges are included in the accumulated other comprehensive loss, and are recognized into earnings over the term of the related senior unsecured notes. As of December 31, 2015 and 2014 , the deferred net losses from these terminated hedges, which are included in accumulated other comprehensive loss relating to net unrealized loss on derivative instrument, was approximately $2.0 million and $2.3 million , respectively. 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 $ 0.6 million of the current balance held in accumulated other comprehensive loss will be reclassified into interest expense within the next 12 months. The following table presents the effect of our derivative financial instrument that is designated and qualifies as a hedging instrument on the consolidated statements of operations for the years ended December 31, 2015 , 2014 and 2013 respectively (in thousands): Amount of Loss Recognized in Other Comprehensive Loss (Effective Portion) Location of Loss Reclassified from Accumulated Other Comprehensive Loss into Income Amount of Gain Reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion) Location of Gain Recognized in Income on Derivative Amount of Gain Recognized into Income (Ineffective Portion) Year Ended December 31, Year Ended December 31, Year Ended December 31, Derivative 2015 2014 2013 2015 2014 2013 2015 2014 2013 (as adjusted) (as adjusted) (as adjusted) (as adjusted) (as adjusted) (as adjusted) Interest Rate Swap $ (109 ) $ (135 ) $ — Interest expense $ 999 $ 970 $ 914 Interest expense $ 3 $ 4 $ 3

Rental Income

Rental Income	12 Months Ended
	Dec. 31, 2015
Leases [Abstract]
Rental Income	Rental Income We are the lessor and the sublessor to tenants under operating leases with expiration dates ranging from January 1, 2016 to 2039. 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, 2015 for the consolidated properties, including consolidated joint venture properties, are as follows (in thousands): 2016 $ 591,405 2017 575,191 2018 544,077 2019 508,603 2020 441,183 Thereafter 2,078,954 $ 4,739,413

Related Party Transactions

Related Party Transactions	12 Months Ended
	Dec. 31, 2015
Related Party Transactions [Abstract]
Related Party Transactions	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. Income earned from profit participation, which is included in other income on the consolidated statements of operations, was $3.3 million , $3.3 million and $3.0 million for the years ended December 31, 2015 , 2014 and 2013 respectively. We also recorded expenses of $9.9 million , $9.1 million and $9.9 million for the years ended December 31, 2015 , 2014 and 2013 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 $10.4 million , $9.8 million and $9.1 million for the years ended December 31, 2015 , 2014 and 2013 , respectively. Insurance We obtain insurance coverage through an insurance program administered by SL Green. In connection with this program, we incurred insurance expense of approximately $6.6 million , $6.4 million and $6.2 million for the years ended December 31, 2015 , 2014 and 2013 respectively. Related Party Receivable from SL Green On July 22, 2015, our parent company issued a promissory note to us in the amount of $90.0 million , which bears interest at an annual rate of 6.0% , compounded quarterly, and matures on July 22, 2017.

Benefit Plans

Benefit Plans	12 Months Ended
	Dec. 31, 2015
Compensation and Retirement Disclosure [Abstract]
Benefit Plans	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, 2013, September 30, 2014, and September 28, 2015, the actuary certified that for the plan years beginning July 1, 2013, July 1, 2014 and July 1, 2015, 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, 2015. The Pension Plan received contributions from employers totaling $242.3 million , $226.7 million and $221.9 million , for the plan years beginning July 1, 2012, July 2013 and July 2014, 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. For the Health plan years ended, June 30, 2015, 2014 and 2013, the plan received contributions from employers totaling $1.1 billion , $1.0 billion and $923.5 million , respectively. Our contributions to the Health Plan represent less than 5.0% of total contributions to the plan. Contributions we made to the multi-employer plans for the years ended December 31, 2015 , 2014 and 2013 are included in the table below (in thousands): Year Ended December 31, 2015 2014 2013 (as adjusted) (as adjusted) Pension Plan $ 1,533 $ 1,529 $ 1,449 Health Plan 4,843 4,585 4,472 Other plans 3,300 3,181 3,125 Total plan contributions $ 9,676 $ 9,295 $ 9,046

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Legal Proceedings As of December 31, 2015 , we were not involved in any material litigation nor, to management's knowledge, was any material litigation threatened against us or our portfolio which if adversely determined could have a material adverse impact on us other than routine litigation arising in the ordinary course of business or litigation that is adequately covered by insurance. Environmental Matters Our management believes that the properties are in compliance in all material respects with applicable Federal, state and local ordinances and regulations regarding environmental issues. Management is not aware of any environmental liability that it believes would have a materially adverse impact on our financial position, results of operations or cash flows. Management is unaware of any instances in which it would incur significant environmental cost if any of our properties were sold. Ground Leases Arrangements The property located at 711 Third Avenue operates under an operating sub-lease, which expires in 2083. The ground rent was reset in July 2011. Following the reset, we are responsible for ground rent payments of $5.25 million annually through July 2016 and then $5.5 million annually thereafter on the 50% portion of the fee that we do not own. The property located at 461 Fifth Avenue operates under a ground lease ( $2.1 million of ground rent annually) with an expiration date of 2027 and 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 fee position for a fixed price on a specific date. The property located at 625 Madison Avenue operates under a ground lease ( $4.6 million of ground rent annually) with an expiration date of 2022 and two options to renew for an additional 23 years. The property located at 1185 Avenue of the Americas operates under a ground lease ( $6.9 million of ground rent annually) with an expiration of 2043 and an option to renew for an additional 23 years. The following is a schedule of future minimum lease payments under non-cancellable operating leases with initial terms in excess of one year as of December 31, 2015 (in thousands): Non-cancellable operating leases 2016 $ 20,440 2017 20,586 2018 20,586 2019 20,586 2020 20,586 Thereafter 328,088 Total minimum lease payments $ 430,872

Segment Information

Segment Information	12 Months Ended
	Dec. 31, 2015
Segment Reporting [Abstract]
Segment Information	Segment Information We are engaged in acquiring, owning, managing and leasing commercial properties in Manhattan, Brooklyn, Westchester County, Connecticut and New Jersey 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. The primary sources of revenue are generated from tenant rents and escalations and reimbursement revenue. Real estate property operating expenses consist primarily of security, maintenance, utility costs, real estate taxes and ground rent expense (at certain applicable properties). See Note 5, "Debt, Preferred Equity and Other Investments," for additional details on our debt and preferred equity investments. Selected results of operations for the years ended December 31, 2015 , 2014 and 2013 and selected asset information as of December 31, 2015 and 2014 , regarding our operating segments are as follows (in thousands): Real Estate Segment Debt and Preferred Equity Segment Total Company Total revenues: Years ended: December 31, 2015 $ 742,585 $ 182,648 $ 925,233 December 31, 2014, as adjusted 670,621 176,901 847,522 December 31, 2013, as adjusted $ 627,210 $ 194,612 $ 821,822 Income from continuing operations before equity in net gain on sale of interest in unconsolidated joint venture/real estate, gain on sale of real estate and depreciable real estate reserves Years ended: December 31, 2015 $ 112,564 $ 160,008 $ 272,572 December 31, 2014, as adjusted 52,431 145,673 198,104 December 31, 2013, as adjusted 25,038 165,858 190,896 Total assets As of: December 31, 2015 $ 6,816,711 $ 2,042,036 $ 8,858,747 December 31, 2014, as adjusted 6,671,984 1,631,789 8,303,773 Income from continuing operations represents total revenues less total expenses for the real estate segment and total investment income and equity in net income from unconsolidated joint venture 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 the portfolio is 100% leveraged by our 2012 revolving credit facility borrowing cost and corporate borrowing cost. We also allocate loan loss reserves, net of recoveries and transaction related costs to the debt and preferred equity segment. We do not allocate marketing, general and administrative expenses to the debt and preferred equity segment, since we base performance on the individual segments prior to allocating marketing, general and administrative expenses. All other expenses, except interest, relate entirely to the real estate assets. There were no transactions between the above two segments. The table below reconciles income from continuing operations to net income for the years ended December 31, 2015 , 2014 and 2013 (in thousands): Year ended December 31, 2015 2014 2013 (as adjusted) (as adjusted) Income from continuing operations before equity in net gain on sale of interest in unconsolidated joint venture/real estate, gain on sale of real estate and depreciable real estate reserves $ 272,572 $ 198,104 $ 190,896 Equity in net gain on sale of interest in unconsolidated joint venture/real estate — 85,559 2,056 Gain on sale of real estate 100,190 — — Depreciable real estate reserves (9,998 ) — — Income from continuing operations 362,764 283,663 192,952 Net income from discontinued operations — 1,996 5,907 Gain on sale of discontinued operations — 117,579 13,756 Net income $ 362,764 $ 403,238 $ 212,615

Quarterly Financial Data of the

Quarterly Financial Data of the Company (unaudited)	12 Months Ended
	Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]
Quarterly Financial Data of the Company (unaudited)	Quarterly Financial Data of the Company (unaudited) Summarized quarterly financial data for the years ended December 31, 2015 and 2014 , which is reflective of the transfer of two properties, SL Green's tenancy in common interest in a fee interest and one entity that held debt investments and financing receivables to us by SL Green, was as follows (in thousands): 2015 Quarter Ended December 31 September 30 June 30 March 31 (as adjusted) (as adjusted) (as adjusted) Total revenues $ 238,283 $ 237,651 $ 234,631 $ 214,668 Income from continuing operations before equity in net income from unconsolidated joint ventures, (loss) gain on sale of real estate, depreciable real estate reserves, unrealized gain (loss) on embedded derivative and loss on extinguishment of debt $ 69,152 $ 65,541 $ 76,236 $ 52,851 Equity in net income from unconsolidated joint ventures 2,265 2,296 2,153 2,127 (Loss) gain on sale of real estate (879 ) 101,069 — — Depreciable real estate reserves — (9,998 ) — — Unrealized gain (loss) on embedded derivative 1,800 (1,800 ) — — Loss on extinguishment of debt — — — (49 ) Net income 72,338 157,108 78,389 54,929 Net income attributable to noncontrolling interests in other partnerships (1,946 ) (293 ) (6,380 ) (550 ) Preferred units dividend (955 ) (743 ) — — Net income attributable to ROP common unitholder $ 69,437 $ 156,072 $ 72,009 $ 54,379 2014 Quarter Ended December 31 September 30 June 30 March 31 (as adjusted) (as adjusted) (as adjusted) (as adjusted) Total revenues $ 214,378 $ 212,164 $ 204,515 $ 216,465 Income from continuing operations before equity in net income (loss) from unconsolidated joint ventures, equity in net gain on sale of interest in unconsolidated joint venture, loss on extinguishment of debt, net (loss) income from discontinued operations and (loss) gain on sale of discontinued operations $ 51,940 $ 48,406 $ 44,966 $ 55,686 Equity in net income (loss) from unconsolidated joint ventures 2,177 2,075 2,626 (2,387 ) Equity in net gain on sale of interest in unconsolidated joint venture — — 86 85,473 Loss on extinguishment of debt (6,866 ) — (519 ) — Net (loss) income from discontinued operations — (58 ) 1,348 706 (Loss) gain on sale of discontinued operations — (250 ) 117,829 — Net income 47,251 50,173 166,336 139,478 Net income attributable to noncontrolling interests in other partnerships (938 ) (841 ) (801 ) (61 ) Net income attributable to ROP common unitholder $ 46,313 $ 49,332 $ 165,535 $ 139,417

Schedule II - Valuation and Qua

Schedule II - Valuation and Qualifying Accounts	12 Months Ended
	Dec. 31, 2015
Valuation and Qualifying Accounts [Abstract]
Schedule II - Valuation and Qualifying Accounts	Schedule II—Valuation and Qualifying Accounts December 31, 2015 (in thousands) Column A Column B Column C Column D Column E Description Balance at Beginning of Year Additions Charged Against Operations/Recovery Uncollectible Accounts Written-off Balance at End of Year Year Ended December 31, 2015 Tenant and other receivables—allowance $ 5,820 $ 4,363 $ (4,590 ) $ 5,593 Deferred rent receivable—allowance 17,745 1,775 (4,732 ) 14,788 Year Ended December 31, 2014, as adjusted Tenant and other receivables—allowance $ 5,382 $ 5,635 $ (5,197 ) $ 5,820 Deferred rent receivable—allowance 18,829 2,916 (4,000 ) 17,745 Year Ended December 31, 2013, as adjusted Tenant and other receivables—allowance $ 5,681 $ 4,459 $ (4,758 ) $ 5,382 Deferred rent receivable—allowance 19,789 4,577 (5,537 ) 18,829

Schedule III - Real Estate And

Schedule III - Real Estate And Accumulated Depreciation	12 Months Ended
	Dec. 31, 2015
SEC Schedule III, Real Estate and Accumulated Depreciation Disclosure [Abstract]
Schedule III - Real Estate And Accumulated Depreciation	Schedule III—Real Estate And Accumulated Depreciation December 31, 2015 (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 $ — $ 65,604 $ 114,077 $ 541,990 $ 656,067 $ 131,946 1970 1/2007 Various 461 Fifth Avenue(1) — — 62,695 — 11,527 — 74,222 74,222 24,449 1988 10/2003 Various 750 Third Avenue(1) — 51,093 205,972 — 37,283 51,093 243,255 294,348 78,460 1958 7/2004 Various 919 Third Avenue(1)(2) 500,000 223,529 1,033,198 — 24,315 223,529 1,057,513 1,281,042 245,932 1970 1/2007 Various 555 W. 57th Street(1) — 18,846 78,704 — 50,261 18,846 128,965 147,811 53,036 1971 1/1999 Various 1185 Avenue of the Americas(1) — — 728,213 — 36,857 — 765,070 765,070 198,483 1969 1/2007 Various 1350 Avenue of the Americas(1) — 91,038 380,744 — 32,612 91,038 413,356 504,394 102,335 1966 1/2007 Various 1100 King Street—1-6 International Drive(3) — 49,392 104,376 2,473 17,612 51,865 121,988 173,853 31,007 1983/1986 1/2007 Various 520 White Plains Road(3) — 6,324 26,096 — 6,720 6,324 32,816 39,140 8,617 1979 1/2007 Various 115-117 Stevens Avenue(3) — 5,933 23,826 — 5,797 5,933 29,623 35,556 7,916 1984 1/2007 Various 100 Summit Lake Drive(3) — 10,526 43,109 — 7,402 10,526 50,511 61,037 13,567 1988 1/2007 Various 200 Summit Lake Drive(3) — 11,183 47,906 — 8,223 11,183 56,129 67,312 14,714 1990 1/2007 Various 500 Summit Lake Drive(3) — 9,777 39,048 — 5,456 9,777 44,504 54,281 10,557 1986 1/2007 Various 360 Hamilton Avenue(3) — 29,497 118,250 — 12,515 29,497 130,765 160,262 31,927 2000 1/2007 Various 7 Landmark Square(4) — 2,088 7,748 (367 ) 84 1,721 7,832 9,553 799 2007 1/2007 Various 680 Washington Boulevard(2)(4) — 11,696 45,364 — 5,818 11,696 51,182 62,878 12,783 1989 1/2007 Various 750 Washington Boulevard(2)(4) — 16,916 68,849 — 6,459 16,916 75,308 92,224 17,391 1989 1/2007 Various 1010 Washington Boulevard(4) — 7,747 30,423 — 5,223 7,747 35,646 43,393 8,732 1988 1/2007 Various 1055 Washington Boulevard(4) — 13,516 53,228 — 5,297 13,516 58,525 72,041 13,747 1987 6/2007 Various 400 Summit Lake Drive(3) — 38,889 — 285 1 39,174 1 39,175 1 - 1/2007 N/A 609 Fifth Avenue(1) — 36,677 145,954 — 8,157 36,677 154,111 190,788 37,473 1925 6/2006 Various 110 East 42nd Street(1) — 34,000 46,411 — 15,868 34,000 62,279 96,279 12,203 1921 5/2011 Various 304 Park Avenue(1) — 54,189 75,619 300 8,122 54,489 83,741 138,230 10,341 1930 6/2012 Various 635 Sixth Avenue(1) — 24,180 37,158 163 49,534 24,343 86,692 111,035 1,462 1902 9/2012 Various 641 Sixth Avenue(1) — 45,668 67,316 308 1,888 45,976 69,204 115,180 7,308 1902 9/2012 Various 315 West 33rd Street(1) — 195,834 164,429 — 6,173 195,834 170,602 366,436 10,246 2000-2001 11/2013 Various 16 Court Street(7) — 19,217 63,210 — 10,854 19,217 74,064 93,281 7,393 1927-1928 4/2013 Various 125 Chubb Way(5) — 5,884 25,958 — 24,482 5,884 50,440 56,324 7,200 2008 1/2008 Various 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 Williamsburg(6)(7) — 3,677 14,708 2,523 (4,550 ) 6,200 10,158 16,358 1,343 2010 12/2010 Various 115 Spring Street(1) — 11,078 44,799 — 247 11,078 45,046 56,124 1,788 1900 7/2014 Various 635 Madison Avenue(1) — 205,632 15,805 — — 205,632 15,805 221,437 515 - 9/2014 N/A 125 Park Avenue(1) — 120,900 189,714 — 55,365 120,900 245,079 365,979 43,887 1923 10/2010 Various 625 Madison Ave(1) — — 246,673 — 38,779 — 285,452 285,452 87,625 1956 10/2004 Various 102 Greene Street(1) — 8,215 26,717 — 277 8,215 26,994 35,209 847 1910 11/2014 Various 711 Third Avenue(1)(6)(8) — 19,844 42,499 — 38,618 19,844 81,117 100,961 29,741 1955 5/1998 Various 752 Madison Avenue(1)(6)(9) — 282,415 — 1,871 — 284,286 — 284,286 — 1996/2012 1/2012 N/A 110 Greene Street(1)(10) — 89,250 165,750 — 324 89,250 166,074 255,324 1,827 1910 7/2015 Various Other(11) — 1,130 — 79 4,692 1,209 4,692 5,901 — Various $ 500,000 $ 1,869,857 $ 4,946,855 $ 7,635 $ 603,896 $ 1,877,492 $ 5,550,751 $ 7,428,243 $ 1,267,598 ____________________________________________________________________ (1) Property located in New York, New York. (2) We own a 51% interest in this property. (3) Property located in Westchester County, New York. (4) Property located in Connecticut. (5) Property located in New Jersey. (6) Property that was transferred in 2015. (7) Property located in Brooklyn, New York. (8) We own a 50% interest in this property. (9) We own a tenancy in common interest in the property. (10) We own a 90% interest in this property. (11) Other includes tenant improvements, capitalized interest and corporate improvements. The changes in real estate for the years ended December 31, 2015 , 2014 and 2013 are as follows (in thousands): 2015 2014 2013 (as adjusted) (as adjusted) Balance at beginning of year $ 7,203,216 $ 6,670,210 $ 6,289,687 Acquisitions 329,996 491,023 479,236 Improvements 93,439 102,530 110,054 Retirements/disposals (198,408 ) (60,547 ) (208,767 ) Balance at end of year $ 7,428,243 $ 7,203,216 $ 6,670,210 The aggregate cost of land, buildings and improvements, before depreciation, for Federal income tax purposes at December 31, 2015 was approximately $5.1 billion (unaudited). The changes in accumulated depreciation, exclusive of amounts relating to equipment, autos, and furniture and fixtures, for the years ended December 31, 2015 , 2014 and 2013 , are as follows (in thousands): 2015 2014 2013 (as adjusted) (as adjusted) Balance at beginning of year $ 1,123,412 $ 983,273 $ 848,077 Depreciation for year 175,039 165,840 160,539 Retirements/disposals (30,853 ) (25,701 ) (25,343 ) Balance at end of year $ 1,267,598 $ 1,123,412 $ 983,273

Significant Accounting Polici28

Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2015
Accounting Policies [Abstract]
Principles of Consolidation	Principles of Consolidation The consolidated financial statements include our accounts and those of our subsidiaries, which are wholly-owned or controlled by us. Entities which we do not control through our voting interest and entities which are variable interest entities, but where we are not the primary beneficiary, are accounted for under the equity method or as preferred equity investments. See Note 5, "Debt, Preferred Equity and Other Investments." ROP's investments in majority-owned and controlled real estate joint ventures are reflected in the 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 the primary beneficiary. The primary beneficiary is the entity that has (i) the power to direct the activities that most significantly impact the entity's economic performance and (ii) the obligation to absorb losses of the VIE or the right to receive benefits from the VIE that could be significant to the VIE. A noncontrolling interest in a consolidated subsidiary is defined as the portion of the equity (net assets) in a subsidiary not attributable, directly or indirectly, to us. Noncontrolling interests are required to be presented as a separate component of capital in the consolidated balance sheet and the presentation of net income is modified to present earnings and other comprehensive income attributed to controlling and noncontrolling interests. We assess the accounting treatment for each joint venture and debt and preferred equity investment. This assessment includes a review of each joint venture or limited liability company agreement to determine which party has what rights and whether those rights are protective or participating. For all VIEs, we review such agreements in order to determine which party has the power to direct the activities that most significantly impact the entity's economic performance. In situations where we and our partner approve, among other things, the annual budget, receive a detailed monthly reporting package, meet on a quarterly basis to review the results of the joint venture, review and approve the joint venture's tax return before filing, and approve all leases that cover more than a nominal amount of space relative to the total rentable space at each property, we do not consolidate the joint venture as we consider these to be substantive participation rights that result in shared power of the activities that most significantly impact the performance of the joint venture. Our joint venture agreements typically contain certain protective rights such as requiring partner approval to sell, finance or refinance the property and the payment of capital expenditures and operating expenditures outside of the approved budget or operating plan.
Investment in Commercial Real Estate Properties	Investment in Commercial Real Estate Properties 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. The Company adopted ASU 2014-08 effective January 1, 2015. As a result, the Company classified 140 Grand Street in White Plains, New York as held for sale as of September 30, 2015, and 131-137 Spring Street as of June 30, 2015 and included the results of operations in continuing operations for all periods presented. Discontinued operations included the results of operations of real estate assets sold or held for sale prior to January 1, 2015. This included 673 First Avenue, which was sold during 2014. See Note 4, "Property Dispositions." 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 the capital lease asset) amounted to $187.2 million , $184.3 million and $170.0 million for the years ended December 31, 2015 , 2014 and 2013 , respectively. On a periodic basis, we assess whether there are any indications that the value of our real estate properties may be other than temporarily impaired or that their carrying value may not be recoverable. A property's value is considered impaired if management's estimate of the aggregate future cash flows (undiscounted 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. We also evaluate our real estate properties for potential impairment when a real estate property has been classified as held for sale. Real estate assets held for sale are valued at the lower of either their carrying value or fair value less costs to sell. During the three months ended September 30, 2015, we recorded a $10.0 million charge in connection with the expected sale of one of our properties, which closed in the fourth quarter of 2015. This charge is included in depreciable real estate reserves in the consolidated statements of operations. Prior to the quarter ended September 30, 2015, we do not believe that there were any indicators of impairment at this property. See Note 4, "Property Dispositions." We do not believe that there were any indicators of impairment at any of our consolidated properties at December 31, 2015 . We incur a variety of costs 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 after major construction activity ceases. 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. We recognize the assets acquired, liabilities assumed (including contingencies) and any noncontrolling interests in an acquired entity at their fair values on the acquisition date. We expense transaction costs related to the acquisition of certain assets as incurred, which are included in transaction related costs on our consolidated statements of operations. Results of operations of properties acquired are included in the consolidated statements of operations from the date of acquisition. We allocate the purchase price of real estate to land and building (inclusive of tenant improvements) and, if determined to be material, intangibles, such as the value of above- and below-market leases and origination costs associated with the in-place leases. We depreciate the amount allocated to building (inclusive of tenant improvements) over their estimated useful lives, which generally range from three to 40 years . We amortize the amount allocated to the above- and below-market leases over the remaining term of the associated lease, which generally range from one to 14 years , and record it as either an increase (in the case of below-market leases) or a decrease (in the case of above-market leases) to rental income. We amortize the amount allocated to the values associated with in-place leases over the expected term of the associated lease, which generally ranges from one to 14 years . If a tenant vacates its space prior to the contractual termination of the lease and no rental payments are being made on the lease, any unamortized balance of the related intangible will be written off. The tenant improvements and origination costs are amortized as an expense over the remaining life of the lease (or charged against earnings if the lease is terminated prior to its contractual expiration date). We assess fair value of the leases based on estimated cash flow projections that utilize appropriate discount and capitalization rates and available market information. Estimates of future cash flows are based on a number of factors including the historical operating results, known trends, and market/economic conditions that may affect the property. To the extent acquired leases contain fixed rate renewal options that are below-market and determined to be material, we amortize such below-market lease value into rental income over the renewal period.
Investment in Unconsolidated Joint Ventures	Investment in Unconsolidated Joint Ventures We account for our investment in the unconsolidated joint venture under the equity method of accounting in cases where 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 we are determined to be the primary beneficiary in a VIE, these participating rights preclude us from consolidating these 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. Equity in net 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, "Debt, Preferred Equity and Other Investments." We assess our investments in unconsolidated joint ventures for recoverability, and if it is determined that a loss in value of the investment is other than temporary, we write down the investment to its fair value. We evaluate our equity investments for impairment based on the joint venture's projected discounted cash flows. We do not believe that the values of any of our equity investments were impaired at December 31, 2015 . We may originate loans for real estate acquisition, development and construction, where we expect to receive some of the residual profit from such projects. When the risk and rewards of these arrangements are essentially the same as an investor or joint venture partner, we account for these arrangements as real estate investments under the equity method of accounting for investments. Otherwise, we account for these arrangements consistent with our loan accounting for our debt and preferred equity investments.
Cash and Cash Equivalents	Cash and Cash Equivalents We consider all highly liquid investments with maturity of three months or less when purchased to be cash equivalents.
Restricted Cash	Restricted Cash Restricted cash primarily consists of security deposits held on behalf of our tenants, interest reserves, as well as capital improvement and real estate tax escrows required under certain loan agreements.
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 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	Revenue Recognition Rental revenue is recognized on a straight-line basis over the term of the lease. Rental revenue recognition commences when the tenant takes possession or controls the physical use of the leased space. In order for the tenant to take possession, the leased space must be substantially ready for its intended use. To determine whether the leased space is substantially ready for its intended use, management evaluates whether we are or the tenant is the owner of tenant improvements for accounting purposes. When management concludes that we are the owner of tenant improvements, rental revenue recognition begins when the tenant takes possession of the finished space, which is when such tenant improvements are substantially complete. In certain instances, when management concludes that we are not the owner (the tenant is the owner) of tenant improvements, rental revenue recognition begins when the tenant takes possession of or controls the space. When management concludes that we are the owner of tenant improvements for accounting purposes, we record amounts funded to construct the tenant improvements as a capital asset. For these tenant improvements, we record amounts reimbursed by tenants as a reduction of the capital asset. When management concludes that the tenant is the owner of tenant improvements for accounting purposes, we record our contribution towards those improvements as a lease incentive, which is included in deferred costs, net on our consolidated balance sheets and amortized as a reduction to rental revenue on a straight-line basis over the term of the lease. The excess of rents recognized over amounts contractually due pursuant to the underlying leases are included in deferred rents receivable on the consolidated balance sheets. We establish, on a current basis, an allowance for future potential tenant credit losses, which may occur against this account. The balance reflected on the consolidated balance sheets is net of such allowance. In addition to base rent, our tenants also generally will pay their pro rata share of increases in real estate taxes and operating expenses for the building over a base year. In some leases, in lieu of paying additional rent based upon increases in building operating expenses, the tenant will pay additional rent based upon increases in the wage rate paid to porters over the porters' wage rate in effect during a base year or increases in the consumer price index over the index value in effect during a base year. In addition, many of our leases contain fixed percentage increases over the base rent to cover escalations. Electricity is most often supplied by the landlord either on a sub-metered basis, or rent inclusion basis (i.e., a fixed fee is included in the rent for electricity, which amount may increase based upon increases in electricity rates or increases in electrical usage by the tenant). Base building services other than electricity (such as heat, air conditioning and freight elevator service during business hours, and base building cleaning) are typically provided at no additional cost, with the tenant paying additional rent only for services which exceed base building services or for services which are provided outside normal business hours. These escalations are based on actual expenses incurred in the prior calendar year. If the expenses in the current year are different from those in the prior year, then during the current year, the escalations will be adjusted to reflect the actual expenses for the current year. We record a gain on sale of real estate when title is conveyed to the buyer, subject to the buyer's financial commitment being sufficient to provide economic substance to the sale and provided that we have no substantial economic involvement with the buyer. Interest income on debt and preferred equity investments is accrued based on the outstanding principal amount and contractual terms of the instruments and when, in the opinion of management, it is deemed collectible. Some debt and preferred equity investments provide for accrual of interest at specified rates, which differ from current payment terms. Interest is recognized on such loans at the accrual rate subject to management's determination that accrued interest is ultimately collectible, based on the underlying collateral and operations of the borrower. If management cannot make this determination, interest income above the current pay rate is recognized only upon actual receipt. Deferred origination fees, original issue discounts and loan origination costs, if any, are recognized as an adjustment to the interest income over the terms of the related investments using the effective interest method. Fees received in connection with loan commitments are also deferred until the loan is funded and are then recognized over the term of the loan as an adjustment to yield. Discounts or premiums associated with the purchase of loans are amortized or accreted into interest income as a yield adjustment on the effective interest method based on expected cashflows through the expected maturity date of the related investment. If we purchase a debt or preferred equity investment at a discount, intend to hold it until maturity and expect to recover the full value of the investment, we accrete the discount into income as an adjustment to yield over the term of the investment. If we purchase a debt or preferred equity investment at a discount with the intention of foreclosing on the collateral, we do not accrete the discount. For debt investments acquired at a discount for credit quality, the difference between contractual cash flows and expected cash flows at acquisition is not accreted. Anticipated exit fees, the collection of which is expected, are also recognized over the term of the loan as an adjustment to yield. Debt and preferred equity investments are placed on a non-accrual status at the earlier of the date at which payments become 90 days past due or when, in the opinion of management, a full recovery of interest income becomes doubtful. Interest income recognition on any non-accrual debt or preferred equity investment is resumed when such non-accrual debt or preferred equity investment becomes contractually current and performance is demonstrated to be resumed. Interest is recorded as income on impaired loans only to the extent cash is received. We may syndicate a portion of the loans that we originate or sell the loans individually. When a transaction meets the criteria for sale accounting, we derecognize the loan sold and recognize gain or loss based on the difference between the sales price and the carrying value of the loan sold. Any related unamortized deferred origination fees, original issue discounts, loan origination costs, discounts or premiums at the time of sale are recognized as an adjustment to the gain or loss on sale, which is included in investment income on the consolidated statements of operations. Any fees received at the time of sale or syndication are recognized as part of investment income.
Allowance for Doubtful Accounts	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	Reserve for Possible Credit Losses The expense for possible credit losses in connection with debt and preferred equity investments is the charge to earnings to increase the allowance for possible credit losses to the level that we estimate to be adequate, based on Level 3 data, considering delinquencies, loss experience and collateral quality. Other factors considered include geographic trends, product diversification, the size of the portfolio and current economic conditions. Based upon these factors, we establish a provision for possible credit loss on each individual investment. When it is probable that we will be unable to collect all amounts contractually due, the investment is considered impaired. Where impairment is indicated on an investment that is held to maturity, a valuation allowance is measured based upon the excess of the recorded investment amount over the net fair value of the collateral. Any deficiency between the carrying amount of an asset and the calculated value of the collateral is charged to expense. We continue to assess or adjust our estimates based on circumstances of a loan and the underlying collateral. If additional information reflects increased recovery of our investment, we will adjust our reserves accordingly. There were no loan reserves recorded during years ended December 31, 2015 , 2014 and 2013 . Debt and preferred equity investments held for sale are carried at the lower of cost or fair market value using available market information obtained through consultation with dealers or other originators of such investments as well as discounted cash flow models based on Level 3 data pursuant to ASC 820-10. As circumstances change, management may conclude not to sell an investment designated as held for sale. In such situations, the investment will be reclassified at its net carrying value to debt and preferred equity investments held to maturity. For these reclassified investments, the difference between the current carrying value and the expected cash to be collected at maturity will be accreted into income over the remaining term of the investment.
Rent Expense	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 leases payable on the consolidated balance sheets.
Income Taxes	Income Taxes ROP is a partnership and, as a result, all income and losses of the partnership are allocated to the partners for inclusion in their respective income tax returns. No provision has been made for income taxes in the consolidated financial statements since such taxes, if any, are the responsibility of the individual partners. We follow a two-step approach for evaluating uncertain tax positions. Recognition (step one) occurs when an enterprise concludes that a tax position, based solely on its technical merits, is more-likely-than-not to be sustained upon examination. Measurement (step two) determines the amount of benefit that is more-likely-than-not to be realized upon settlement. Derecognition of a tax position that was previously recognized would occur when a company subsequently determines that a tax position no longer meets the more-likely-than-not threshold of being sustained. The use of a valuation allowance as a substitute for derecognition of tax positions is prohibited.
Shares Contributed by Parent Company	Shares Contributed by Parent Company We present shares of SL Green common stock as a contra-equity account in our financial statements.
Exchangeable Debt Instruments	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 our 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 may be 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	Derivative Instruments In the normal course of business, we use a variety of commonly used derivative instruments, such as interest rate swaps, caps, collar and floors, to manage, or hedge, interest rate risk. Effectiveness is essential for those derivatives that we intend to qualify 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.
Use of Estimates	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.
Concentrations of Credit Risk	Concentrations of Credit Risk Financial instruments that potentially subject us to concentrations of credit risk consist primarily of cash investments, debt and preferred equity investments and accounts receivable. We place our cash investments in excess of insured amounts with high quality financial institutions. The collateral securing our debt and preferred equity investments is located in New York City. See Note 5, "Debt, Preferred Equity and Other Investments." We perform ongoing credit evaluations of our tenants and require most tenants to provide security deposits or letters of credit. Though these security deposits and letters of credit are insufficient to meet the total value of a tenant's lease obligation, they are a measure of good faith and a source of funds to offset the economic costs associated with lost rent and the costs associated with re-tenanting a space. Although the properties in our real estate portfolio are primarily located in Manhattan, we also have properties located in Brooklyn, Westchester County, Connecticut and New Jersey. The tenants located in our buildings operate in various industries.
Reclassification	Reclassification Certain prior year balances have been reclassified to conform to our current year presentation primarily in order to include the transfer of two properties, SL Green's tenancy in common interest in a fee interest and one entity that held debt investments and financing receivables in 2015.
Accounting Standards Updates	Accounting Standards Updates In February 2016, the Financial Accounting Standards Board, or FASB, issued guidance that amends the existing accounting standards for lease accounting, including requiring lessees to recognize most leases on their balance sheets and making targeted improvements to lessor accounting (Accounting Standards Update, or ASU, No. 2016-02). The guidance requires a modified retrospective transition approach for all leases existing at, or entered into after, the date of initial application, with an option to use certain transition relief. The guidance will be effective for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years. Early adoption is permitted. The Company is currently evaluating the impact of adopting this new accounting standard on the Company's consolidated financial statements. In January 2016, the FASB issued ASU No. 2016-01 (ASC 825-10), Recognition and Measurement of Financial Assets and Financial Liabilities. The guidance requires entities to measure equity investments that do not result in consolidation and are not accounted for under the equity method at fair value and to record changes in instruments-specific credit risk for financial liabilities measured under the fair value option in other comprehensive income. The guidance is effective for fiscal years beginning after December 15, 2017, and for interim periods therein. The Company is currently evaluating the impact of adopting this new accounting standard on the Company’s consolidated financial statements. In September 2015, the FASB issued final guidance to simplify the measurement-period adjustments in business combinations (ASU No. 2015-16). The guidance eliminates the requirement that an acquirer in a business combination account for measurement-period adjustments retrospectively. Instead, acquirers must recognize measurement-period adjustments in the period in which they determine the amounts, including the effect on earnings of any amounts they would have recorded in previously periods if the accounting had been completed at the acquisition date. The guidance is effective for fiscal years beginning after December 15, 2015, and for interim periods within those fiscal years. Early adoption of the guidance is permitted. The Company adopted the guidance during the third quarter of 2015. In April 2015, the FASB issued final guidance to simplify the presentation of debt issuance costs by requiring debt issuance costs to be presented as a deduction from the corresponding debt liability (ASU No. 2015-03). The guidance requires that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability. The guidance is effective for fiscal years beginning after December 15, 2015, and interim periods within those fiscal years. Early adoption of the guidance is permitted. Upon adoption, an entity must apply the new guidance retrospectively for all prior periods presented in the financial statements. The Company adopted the guidance effective January 1, 2016 and the guidance did not have a material impact on our consolidated financial statements. In February 2015, the FASB, issued new guidance that amends the current consolidation guidance, including introducing a separate consolidation analysis specific to limited partnerships and other similar entities (ASU No. 2015-02). Under this analysis, limited partnerships and other similar entities will be considered a VIE unless the limited partners hold substantive kick-out rights or participating rights. The guidance is effective for annual and interim periods beginning after December 15, 2015. Early adoption of this guidance is permitted. The Company adopted the guidance effective January 1, 2016 and the guidance did not have a material impact on our consolidated financial statements. In June 2014, the FASB issued final guidance that requires repurchase-to-maturity transactions to be accounted for as secured borrowings as if the transferor retains effective control, even though the transferred financial assets are not returned to the transferor at settlement and also eliminates existing guidance for repurchase financings (ASU No. 2014-11). New disclosures are required for (1) certain transactions accounted for as secured borrowings and (2) transfers accounted for as sales when the transferor also retains substantially all of the exposure to the economic return on the transferred financial assets throughout the term of the transaction. The guidance was effective for the first interim or annual period beginning after December 15, 2014, except for the disclosures related to transactions accounted for as secured borrowings, which are effective for periods beginning after March 15, 2015. Early adoption of this guidance is prohibited. The Company adopted the standard beginning in the third quarter of 2015 as a result of the transfer of one entity that held debt investments and financing receivables during the third quarter of 2015. The adoption of this guidance did not have a material impact on our consolidated financial statements. In May 2014, the FASB issued a new comprehensive revenue recognition guidance which requires us to recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which we expect to be entitled in exchange for those goods and services (ASU No. 2014-09). The guidance also requires enhanced disclosures to help users of financial statements better understand the nature, amount, timing, and uncertainty of revenue that is recognized. The guidance is effective for annual and interim periods beginning after December 15, 2016 and early adoption is not permitted. In July 2015, the FASB voted to defer by one year the effective date of ASU No. 2014-09 for both public and nonpublic entities and give both public and private companies the option to early adopt using the original effective date. The new guidance can be applied either retrospectively to each prior reporting period presented, or as a cumulative-effect adjustment as of the date of adoption. The Company is currently evaluating the new guidance to determine the impact it may have on our consolidated financial statements. In April 2014, the FASB issued new guidance on reporting discontinued operations which raises the threshold for disposals to qualify as discontinued operations (ASU No. 2014-08). The guidance also allows us to have a significant continuing involvement and continuing cash flows with the discontinued operations. Additionally, the guidance requires additional disclosures for discontinued operations and new disclosures for individually material disposal transactions that do not meet the definition of a discontinued operation. The guidance was effective for calendar year public companies beginning in the first quarter of 2015 and is to be applied on a prospective basis for new disposals. Early adoption of this guidance was permitted. The Company adopted the standard beginning in the first quarter of 2015. The adoption of this guidance changed the presentation of discontinued operations for all properties held for sale and/or disposed of subsequent to January 1, 2015.
Fair Value Measurements	Fair Value Measurements We are required to disclose fair value information with regard to our financial instruments, whether or not recognized in the consolidated balance sheets, for which it is practical to estimate fair value. The FASB guidance defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants on the measurement date. We measure and/or disclose the estimated fair value of financial assets and liabilities based on a hierarchy that distinguishes between market participant assumptions based on market data obtained from sources independent of the reporting entity and the reporting entity’s own assumptions about market participant assumptions. This hierarchy consist of three broad levels: Level 1 - quoted prices (unadjusted) in active markets for identical assets or liabilities that the reporting entity can access at the measurement date; Level 2 - inputs other than quoted prices included within Level 1, that are observable for the asset or liability, either directly or indirectly; and Level 3 - unobservable inputs for the asset or liability that are used when little or no market data is available. We follow this hierarchy for our assets and liabilities measured at fair value on a recurring and nonrecurring basis. In instances in which the determination of the fair value measurement is based on inputs from different levels of the fair value hierarchy, the level in the fair value hierarchy within which the entire fair value measurement falls is based on the lowest level of input that is significant to the fair value measurement in its entirety. Our assessment of the significance of the particular input to the fair value measurement in its entirety requires judgment and considers factors specific to the asset or liability. We determine other than temporary impairment in real estate investments and debt and preferred equity investments, including intangibles utilizing cash flow projections that apply, among other things, estimated revenue and expense growth rates, discount rates and capitalization rates, which are classified as Level 3 inputs. The fair value of derivative instruments is based on current market data received from financial sources that trade such instruments and are based on prevailing market data and derived from third party proprietary models based on well-recognized financial principles and reasonable estimates about relevant future market conditions, which are classified as Level 2 inputs. The financial assets and liabilities that are not measured at fair value on our consolidated balance sheets include cash and cash equivalents, restricted cash, accounts receivable, accounts payable and accrued expenses, debt and preferred equity investments, mortgages and other loans payable and other secured and unsecured debt. The carrying amount of cash and cash equivalents, restricted cash, accounts receivable, and accounts payable and accrued expenses reported in our consolidated balance sheets approximates fair value due to the short term nature of these instruments. The fair value of debt and preferred equity investments, which is classified as Level 3, is estimated by discounting the future cash flows using current interest rates at which similar loans with the same maturities would be made to borrowers with similar credit ratings. The fair value of borrowings, which is classified as Level 3, is estimated by discounting the contractual cash flows of each debt instrument to their present value using adjusted market interest rates, which is provided by a third-party specialist.

Organization and Basis of Pre29

Organization and Basis of Presentation (Tables)	12 Months Ended
	Dec. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of commercial office properties	As of December 31, 2015 , we owned the following interests in properties in the New York Metropolitan area, primarily in midtown Manhattan. Our investments in the New York Metropolitan area also include investments in Brooklyn, Westchester County, Connecticut and New Jersey, which are collectively known as the Suburban properties: Location Type Number of Properties Approximate Square Feet (unaudited) Weighted Average (1) (unaudited) Commercial: Manhattan Office 16 8,463,245 94.9 % Retail (2)(3) 5 352,892 97.6 % Fee Interest 2 197,654 100.0 % 23 9,013,791 95.1 % Suburban Office 19 3,287,800 80.0 % Retail 1 52,000 100.0 % 20 3,339,800 80.3 % Total commercial properties 43 12,353,591 91.1 % Residential: Manhattan Residential (2) — 222,855 89.5 % Total portfolio 43 12,576,446 91.1 % ____________________________________________________________________ (1) The weighted average occupancy for commercial properties represents the total occupied square feet divided by total available rentable square feet. The weighted average occupancy for residential properties represents the total occupied units divided by total available units. (2) As of December 31, 2015 , we owned a building that was comprised of approximately 270,132 square feet (unaudited) of retail space and approximately 222,855 square feet (unaudited) of residential space. For the purpose of this report, we have included the building in the retail properties count and have bifurcated the square footage into the retail and residential components. (3) Includes two unconsolidated joint venture retail properties at 131-137 Spring Street comprised of approximately 68,342 square feet (unaudited).

Significant Accounting Polici30

Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2015
Accounting Policies [Abstract]
Schedule of estimated useful lives	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
Summary of identified intangible assets (acquired above-market leases and in-place leases) and intangible liabilities (acquired below-market leases)	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, 2015 and 2014 (in thousands): December 31, 2015 December 31, 2014 (as adjusted) Identified intangible assets (included in other assets): Gross amount $ 307,824 $ 297,238 Accumulated amortization (235,040 ) (216,841 ) Net $ 72,784 $ 80,397 Identified intangible liabilities (included in deferred revenue): Gross amount $ 523,228 $ 450,326 Accumulated amortization (346,857 ) (322,694 ) Net $ 176,371 $ 127,632
Schedule of estimated annual amortization of acquired below-market leases, net of acquired above-market leases	The estimated annual amortization of acquired below-market leases, net of acquired above-market leases (a component of rental revenue), for each of the five succeeding years is as follows (in thousands): 2016 $ 3,017 2017 4,994 2018 6,548 2019 7,128 2020 6,919
Schedule of estimated annual amortization of all other identifiable assets	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 (in thousands): 2016 $ 4,600 2017 3,326 2018 2,177 2019 1,751 2020 1,588

Property Acquisition (Tables)

Property Acquisition (Tables)	12 Months Ended
	Dec. 31, 2015
2014 Acquisitions
Business Acquisition [Line Items]
Schedule of recognized identified assets acquired and liabilities assumed	During the year ended December 31, 2015, we finalized the purchase price allocation based on third party appraisal and additional facts and circumstances that existed at the acquisition dates for the following 2014 acquisitions (in thousands): 102 Greene (1) 635 Madison Ave (1) 115 Spring Street (1) Acquisition Date October 2014 September 2014 July 2014 Ownership Type Fee Interest Fee Interest Fee Interest Property Type Retail Land Retail Purchase Price Allocation: Land $ 8,215 $ 205,632 $ 11,078 Building and building leasehold 26,717 15,805 44,799 Above-market lease value — — — Acquired in-place lease value 1,015 17,345 2,037 Other assets, net of other liabilities 3 — — Assets acquired 35,950 238,782 57,914 Mark-to-market assumed debt — — — Below-market lease value 3,701 85,036 4,789 Liabilities assumed 3,701 85,036 4,789 Purchase price $ 32,249 $ 153,746 $ 53,125 Net consideration funded by us at closing, excluding consideration financed by debt $ 32,249 $ 153,746 $ 53,125 Equity and/or debt investment held $ — $ — $ — Debt assumed $ — $ — $ — ____________________________________________________________________ (1) Based on our preliminary analysis of the purchase price, we had allocated $11.3 million and $21.0 million to land and building, respectively, at 102 Greene Street, $153.7 million to land at 635 Madison Avenue, and $15.9 million and $37.2 million to land and building, respectively, at 115 Spring Street. The impact to our consolidated statement of operations for the year ended December 31, 2015 was $1.9 million in rental revenue for the amortization of aggregate below-market leases and $1.1 million of depreciation expense.
2013 Acquisitions
Business Acquisition [Line Items]
Schedule of recognized identified assets acquired and liabilities assumed	During the year ended December 31, 2013, the properties listed below were acquired from third parties. The following summarizes our allocation of the purchase price of the assets acquired and liabilities assumed upon the closing of these acquisitions (in thousands): 315 West 33rd Street (1) 16 Court Street (2) Acquisition Date November 2013 April 2013 Ownership Type Fee Interest Fee Interest Property Type Residential Office Purchase Price Allocation: Land $ 195,834 $ 19,217 Building and building leasehold 164,429 63,210 Above-market lease value 7,084 5,122 Acquired in-place lease value 26,125 9,422 Other assets, net of other liabilities 1,142 3,380 Assets acquired 394,614 100,351 Mark-to-market assumed debt — 294 Below-market lease value 7,839 3,885 Liabilities assumed 7,839 4,179 Purchase price $ 386,775 $ 96,172 Net consideration funded by us at closing, excluding consideration financed by debt $ 386,775 $ 4,000 Equity and/or debt investment held $ — $ 11,535 Debt assumed $ — $ 84,642 ____________________________________________________________________ (1) During the year ended December 31, 2014, we finalized the purchase price allocation based on a third party appraisal and additional facts and circumstances that existed at the acquisition dates. These adjustments did not have a material impact to our consolidated statement of operations for the year ended December 31, 2014. (2) This property was transferred from SL Green in 2014. See Note 1, "Organization and Basis of Presentation," for further discussion. In April 2013, we acquired interests from our joint venture partner, City Investment Fund, in 16 Court Street in Brooklyn for $4.0 million . We have consolidated the ownership of the building. The transaction valued the consolidated interest at $96.2 million , inclusive of the $84.6 million mortgage encumbering the property. In April 2014, we repaid the mortgage.

Property Dispositions (Tables)

Property Dispositions (Tables)	12 Months Ended
	Dec. 31, 2015
Discontinued Operations and Disposal Groups [Abstract]
Schedule of properties sold and income from discontinued operations	The following table summarizes the properties sold during the years ended December 31, 2015 , 2014 and 2013: Property Disposition Date Property Type Approximate Usable Square Feet (unaudited) Sale Price (1) (in millions) Gain (loss) on Sale (2) (in millions) 140 Grand Street (3) December 2015 Office 130,100 $ 22.4 $ (10.5 ) 131-137 Spring Street (4) August 2015 Office 68,342 $ 277.8 $ 101.1 673 First Avenue May 2014 Office 422,000 $ 145.0 $ 117.6 333 West 34th Street August 2013 Office 345,400 $ 220.3 $ 13.8 ____________________________________________________________________ (1) Sales price represents the actual sales price for the property or the gross asset valuation for the interest in a property. (2) The gain on sale for 131-137 Spring Street, 673 First Avenue and 333 West 34th Street are net of $4.1 million , $3.4 million and $3.0 million , respectively, in employee compensation awards accrued in connection with the realization of these investment gains as a bonus to certain employees that were instrumental in realizing the gain on sale. Additionally, amounts do not include adjustments for expenses recorded in subsequent periods. (3) Gain/(loss) on sale includes a $10.0 million charge that was recorded during the third quarter of 2015. This charge is included in depreciable real estate reserves in the consolidated statement of operations. (4) We sold an 80% interest in 131-137 Spring Street and have subsequently accounted for our interest in the properties as an investment in unconsolidated joint ventures. See Note 5, "Debt, Preferred Equity and Other Investments." The following table summarizes net income from discontinued operations for the years ended December 31, 2014 and 2013 (in thousands): Year Ended December 31, 2014 2013 Revenues Rental revenue $ 7,853 $ 28,843 Escalation and reimbursement revenues 1,080 4,093 Other income — 8 Total revenues 8,933 32,944 Operating expenses 1,222 6,733 Real estate taxes 1,402 4,571 Ground rent 3,001 7,974 Interest expense, net of interest income 879 2,933 Depreciation and amortization 433 4,826 Total expenses 6,937 27,037 Net income from discontinued operations $ 1,996 $ 5,907

Debt, Preferred Equity and Ot33

Debt, Preferred Equity and Other Investments (Tables)	12 Months Ended
	Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract]
Schedule of debt investments	As of December 31, 2015 and 2014 , we held the following debt investments with an aggregate weighted average current yield of 10.23% at December 31, 2015 (in thousands): Loan Type December 31, 2015 Future Funding Obligations December 31, 2015 Senior Financing December 31, 2015 Carrying Value (1) December 31, 2014 Carrying Value (1) Initial Maturity Date (as adjusted) Fixed Rate Investments: Jr. Mortgage Participation/ Mezzanine Loan (2)(3) $ — $ — $ 23,510 $ 45,611 May 2016 Jr. Mortgage Participation — 133,000 49,000 49,000 June 2016 Mezzanine Loan — 115,000 24,916 24,910 July 2016 Mezzanine Loan — 165,000 72,102 71,656 November 2016 Jr. Mortgage Participation/Mezzanine Loan — 1,109,000 104,661 98,934 March 2017 Mezzanine Loan (3) — — 66,183 65,770 March 2017 Mezzanine Loan (4) — 502,100 41,115 24,608 June 2017 Loan Type December 31, 2015 Future Funding Obligations December 31, 2015 Senior Financing December 31, 2015 Carrying Value (1) December 31, 2014 Carrying Value (1) Initial Maturity Date (as adjusted) Mezzanine Loan — 539,000 49,691 49,629 July 2018 Mortgage Loan (5) — — 26,262 26,209 February 2019 Mortgage Loan — — 513 637 August 2019 Mezzanine Loan — 15,000 3,500 3,500 September 2021 Mezzanine Loan (6) — 89,880 19,936 19,930 November 2023 Mezzanine Loan — 95,000 30,000 30,000 January 2025 Mezzanine Loan (7) — — — 14,068 Jr. Mortgage Participation (8) — — — 11,934 Jr. Mortgage Participation (9) — — — 70,688 Total fixed rate $ — $ 2,762,980 $ 511,389 $ 607,084 Floating Rate Investments: Mezzanine Loan (10) — 775,000 74,700 73,402 March 2016 Mortgage/Mezzanine Loan 10,156 — 94,901 — April 2016 Mezzanine Loan (11) — 160,000 22,625 22,573 June 2016 Mezzanine Loan 7,942 312,939 66,398 — November 2016 Mezzanine Loan — 360,000 99,530 99,023 November 2016 Mezzanine Loan (12) 11,414 131,939 49,751 42,750 December 2016 Mezzanine Loan 281 39,201 13,731 11,835 December 2016 Mortgage/Mezzanine Loan (13) 57,108 — 134,264 — January 2017 Mezzanine Loan 1,293 118,949 28,551 20,651 January 2017 Mortgage/Mezzanine Loan — — 68,977 — June 2017 Jr. Mortgage Participation/Mezzanine Loan 1,257 118,717 40,346 38,524 July 2017 Mortgage/Mezzanine Loan — — 22,877 22,803 July 2017 Mortgage/Mezzanine Loan — — 16,901 16,848 September 2017 Mortgage/Mezzanine Loan 4,500 — 19,282 — October 2017 Mezzanine Loan — 60,000 14,904 14,859 November 2017 Mezzanine Loan — 85,000 29,505 — December 2017 Mezzanine Loan — 65,000 28,563 — December 2017 Mortgage/Mezzanine Loan (14) 795 — 14,942 14,845 December 2017 Jr. Mortgage Participation — 40,000 19,846 — April 2018 Mezzanine Loan — 175,000 34,725 — April 2018 Jr. Mortgage Participation/Mezzanine Loan — 55,000 20,510 20,533 July 2018 Mortgage/Mezzanine Loan (15) 1,500 — 31,210 — August 2018 Mezzanine Loan — 33,000 26,777 — December 2018 Mezzanine Loan 6,383 156,383 52,774 — December 2018 Mezzanine Loan 28,801 206,717 49,625 — December 2018 Mortgage/Mezzanine Loan — — 18,395 18,083 February 2019 Mezzanine Loan — 38,000 21,845 21,807 March 2019 Mezzanine Loan (16) — — — 33,726 Mezzanine Loan (16) — — — 37,322 Mortgage/Mezzanine Loan (17) — — — 109,527 Loan Type December 31, 2015 Future Funding Obligations December 31, 2015 Senior Financing December 31, 2015 Carrying Value (1) December 31, 2014 Carrying Value (1) Initial Maturity Date (as adjusted) Mezzanine Loan (18) — — — 49,614 Total floating rate $ 131,430 $ 2,930,845 $ 1,116,455 $ 668,725 Total $ 131,430 $ 5,693,825 $ 1,627,844 $ 1,275,809 ____________________________________________________________________ (1) Carrying value is net of discounts, premiums, original issue discounts and deferred origination fees. (2) The $22.9 million junior mortgage participation, which matures in February 2016, was sold in July 2015. (3) These loans are collateralized by defeasance securities. (4) Carrying value is net of $41.3 million that was participated out, which is included in other assets and other liabilities on the consolidated balance sheets as a result of the transfer not meeting the conditions for sale accounting. (5) In September 2014, we acquired a $26.4 million mortgage loan at a $0.2 million discount and a $5.7 million junior mortgage participation at a $5.7 million discount. The junior mortgage participation was a nonperforming loan at acquisition and is currently on non-accrual status. (6) Carrying value is net of $5.0 million that was participated out, which is included in other assets and other liabilities on the consolidated balance sheets as a result of the transfer not meeting the conditions for sale accounting. (7) This loan was repaid in February 2015. (8) This loan was repaid in March 2015. (9) These loans were repaid in December 2015. (10) In March 2016, the maturity date was extended to September 2016. (11) Carrying value is net of $7.4 million that was participated out, which is included in other assets and other liabilities on the consolidated balance sheets as a result of the transfer not meeting the conditions for sale accounting. (12) In February 2015, the maturity date was extended to December 2016. (13) Carrying value is net of $25.0 million that was participated out, which is included in other assets and other liabilities on the consolidated balance sheets as a result of the transfer not meeting the conditions for sale accounting. (14) Carrying value is net of $5.1 million that was participated out, which is included in other assets and other liabilities on the consolidated balance sheets as a result of the transfer not meeting the conditions for sale accounting. (15) In January 2016, the loans were modified and the mortgage was sold. (16) These loans were repaid in April 2015. (17) This loan was repaid in August 2015. (18) This loan was repaid in November 2015.
Schedule of preferred equity investments	As of December 31, 2015 and 2014 , we held the following preferred equity investments, with an aggregate weighted average current yield of 7.86% at December 31, 2015 (in thousands): Type December 31, 2015 Future Funding Obligations December 31, 2015 Senior Financing December 31, 2015 Carrying Value (1) December 31, 2014 (1) Initial Mandatory Redemption Preferred equity (2) $ — $ 71,486 $ 9,967 $ 9,954 March 2018 Preferred equity 5,580 60,183 32,209 — November 2018 Preferred equity (3) — — — 123,041 $ 5,580 $ 131,669 $ 42,176 $ 132,995 ____________________________________________________________________ (1) Carrying value is net of deferred origination fees. (2) In March 2015, the redemption date was extended to March 2018. (3) This investment was redeemed in July 2015. The following table is a rollforward of our total loan loss reserves at December 31, 2015 , 2014 and 2013 (in thousands): Year Ended December 31, 2015 2014 2013 Balance at beginning of year $ — $ 1,000 $ 7,000 Expensed — — — Recoveries — — — Charge-offs and reclassifications — (1,000 ) (6,000 ) Balance at end of period $ — $ — $ 1,000
Schedule of investment in real estate joint venture	As of December 31, 2015 , we have one investment in a real estate joint venture in which we do not control as a result of the level of our voting interest. The following table provides general information on our joint venture as of December 31, 2015 : Property Partner Ownership Interest Economic Interest Approximate Square Feet (unaudited) Acquisition Date Acquisition Price (1) (in thousands) 131-137 Spring Street (2) Invesco Real Estate 20% 20% 68,342 August 2015 $ 277,750 __________________________________________________________________ (1) Acquisition price represents the actual or implied gross purchase price for the joint venture, which is not adjusted for subsequent acquisitions of additional interest. (2) In August 2015, we sold an 80% interest in 131-137 Spring Street and through the joint venture obtained a $141.0 million 5 -year, floating rate mortgage financing, which bears interest at 155 basis points over the 30-day LIBOR. These properties, which were previously wholly-owned, were accounted for in commercial real estate properties on the consolidated balance sheet. See Note 4, "Property Dispositions."

Mortgages and Other Loans Pay34

Mortgages and Other Loans Payable (Tables)	12 Months Ended
	Dec. 31, 2015
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	The first mortgages and other loans payable collateralized by either the respective properties and assignment of leases or certain debt investments at December 31, 2015 and 2014 , respectively, were as follows (amounts in thousands): Property Maturity Date Interest Rate (1) December 31, 2015 December 31, 2014 Fixed Rate Debt: (as adjusted) 919 Third Avenue (2) June 2023 5.12 % $ 500,000 $ 500,000 711 Third Avenue (3) — 120,000 Total fixed rate debt 500,000 620,000 Floating Rate Debt: Master Repurchase Agreement June 2016 3.36 % $ 253,424 $ 100,000 Total floating rate debt 253,424 100,000 Total fixed and floating rate debt $ 753,424 $ 720,000 ____________________________________________________________________ (1) Effective weighted average interest rate for the year ended December 31, 2015 . (2) We own a 51.0% controlling interest in the joint venture that is the borrower on this loan. (3) In March 2015, we repaid the mortgage.

Corporate Indebtedness (Tables)

Corporate Indebtedness (Tables)	12 Months Ended
	Dec. 31, 2015
Debt Disclosure [Abstract]
Schedule of senior unsecured notes and other related disclosures by scheduled maturity date	The following table sets forth our senior unsecured notes and other related disclosures as of December 31, 2015 and 2014 , respectively, by scheduled maturity date (dollars in thousands): Issuance December 31, 2015 December 31, 2015 December 31, 2014 Coupon Rate (1) Effective Rate Term (in Years) Maturity Date March 31, 2006 (2) $ 255,308 $ 255,296 $ 255,250 6.00 % 6.00 % 10 March 31, 2016 August 5, 2011 (3) 250,000 249,810 249,744 5.00 % 5.00 % 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) 200,000 200,000 200,000 4.50 % 4.50 % 10 December 1, 2022 December 15, 2015 (3) 100,000 100,000 — 4.27 % 4.27 % 10 December 17, 2025 June 27, 2005 (4) — — 7 $ 1,055,308 $ 1,055,106 $ 955,001 ______________________________________________________________________ (1) Interest on the senior unsecured notes is payable semi-annually with principal and unpaid interest due on the scheduled maturity dates. (2) The notes will be repaid at maturity. (3) Issued by SL Green, the Operating Partnership and ROP, as co-obligors. (4) In April 2015, we redeemed the remaining outstanding debentures.
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	Combined aggregate principal maturities of our mortgage and other loans payable, 2012 credit facility and senior unsecured notes as of December 31, 2015 , including as-of-right extension options and put options, were as follows (in thousands): Scheduled Amortization Principal Repayments Revolving Credit Facility Unsecured Term Loan Senior Unsecured Notes Total 2016 $ 3,566 $ 253,424 $ — $ — $ 255,308 $ 512,298 2017 7,411 — — — — 7,411 2018 7,799 — — — 250,000 257,799 2019 8,207 — — 933,000 — 941,207 2020 8,637 — 994,000 — 250,000 1,252,637 Thereafter 22,786 441,594 — — 300,000 764,380 $ 58,406 $ 695,018 $ 994,000 $ 933,000 $ 1,055,308 $ 3,735,732
Schedule of Consolidated Interest expense, excluding capitalized interest	Consolidated interest expense, excluding capitalized interest, was comprised of the following (in thousands): Year Ended December 31, 2015 2014 2013 (as adjusted) (as adjusted) Interest expense $ 119,360 $ 129,427 $ 133,853 Interest income (18 ) (71 ) (8 ) Interest expense, net $ 119,342 $ 129,356 $ 133,845 Interest capitalized $ 1,107 $ 3,753 $ —

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2015
Fair Value Disclosures [Abstract]
Fair Value, by Balance Sheet Grouping	The following table provides the carrying value and fair value of these financial instruments as of December 31, 2015 and 2014 (in thousands): December 31, 2015 December 31, 2014 Carrying Value Fair Value Carrying Value Fair Value (as adjusted) (as adjusted) Debt and preferred equity investments $ 1,670,020 (1) (2) $ 1,408,804 (1) (2) Fixed rate debt $ 1,585,106 $ 1,663,078 $ 1,605,001 $ 1,737,673 Variable rate debt 2,150,424 2,164,673 1,288,000 1,331,177 $ 3,735,530 $ 3,827,751 $ 2,893,001 $ 3,068,850 ______________________________________________________________________ (1) Excludes one investment with a book value of $100.2 million and $100.0 million as of December 31, 2015 and 2014 , respectively, which we accounted for under the equity method accounting as a result of meeting the criteria of a real estate investment under the guidance for Acquisition, Development and Construction arrangements, and other investments with a book value of $168.3 million and $107.0 million as of December 31, 2015 and 2014 , respectively. (2) At December 31, 2015 , debt and preferred equity investments had an estimated fair value ranging between $1.7 billion and $1.8 billion . At December 31, 2014 , debt and preferred equity investments had an estimated fair value ranging between $1.5 billion and $1.8 billion .

Financial Instruments_ Deriva37

Financial Instruments: Derivatives and Hedging (Tables)	12 Months Ended
	Dec. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of notional and fair value of derivative financial instruments and foreign currency hedges	The following table summarizes the notional and fair value of our derivative financial instrument at December 31, 2015 based on Level 2 inputs. The notional value is an indication of the extent of our involvement in that instrument at that time, but does not represent exposure to credit, interest rate or market risks. Notional Value Strike Rate Effective Date Expiration Date Balance Sheet Location Fair Value Interest Rate Swap $30,000 2.295% July 2010 June 2016 Other Liabilities $ (241 )
Schedule of effect of derivative financial instruments on consolidated statements of income	The following table presents the effect of our derivative financial instrument that is designated and qualifies as a hedging instrument on the consolidated statements of operations for the years ended December 31, 2015 , 2014 and 2013 respectively (in thousands): Amount of Loss Recognized in Other Comprehensive Loss (Effective Portion) Location of Loss Reclassified from Accumulated Other Comprehensive Loss into Income Amount of Gain Reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion) Location of Gain Recognized in Income on Derivative Amount of Gain Recognized into Income (Ineffective Portion) Year Ended December 31, Year Ended December 31, Year Ended December 31, Derivative 2015 2014 2013 2015 2014 2013 2015 2014 2013 (as adjusted) (as adjusted) (as adjusted) (as adjusted) (as adjusted) (as adjusted) Interest Rate Swap $ (109 ) $ (135 ) $ — Interest expense $ 999 $ 970 $ 914 Interest expense $ 3 $ 4 $ 3

Rental Income (Tables)

Rental Income (Tables)	12 Months Ended
	Dec. 31, 2015
Leases [Abstract]
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, 2015 for the consolidated properties, including consolidated joint venture properties, are as follows (in thousands): 2016 $ 591,405 2017 575,191 2018 544,077 2019 508,603 2020 441,183 Thereafter 2,078,954 $ 4,739,413

Benefit Plans (Tables)

Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2015
Compensation and Retirement Disclosure [Abstract]
Schedule of contributions made to multi-employer plans	Contributions we made to the multi-employer plans for the years ended December 31, 2015 , 2014 and 2013 are included in the table below (in thousands): Year Ended December 31, 2015 2014 2013 (as adjusted) (as adjusted) Pension Plan $ 1,533 $ 1,529 $ 1,449 Health Plan 4,843 4,585 4,472 Other plans 3,300 3,181 3,125 Total plan contributions $ 9,676 $ 9,295 $ 9,046

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Schedule of future minimum lease payments under capital leases and noncancellable operating leases	The following is a schedule of future minimum lease payments under non-cancellable operating leases with initial terms in excess of one year as of December 31, 2015 (in thousands): Non-cancellable operating leases 2016 $ 20,440 2017 20,586 2018 20,586 2019 20,586 2020 20,586 Thereafter 328,088 Total minimum lease payments $ 430,872

Segment Information (Tables)

Segment Information (Tables)	12 Months Ended
	Dec. 31, 2015
Segment Reporting [Abstract]
Schedule of Selected results of operations and selected asset information	Selected results of operations for the years ended December 31, 2015 , 2014 and 2013 and selected asset information as of December 31, 2015 and 2014 , regarding our operating segments are as follows (in thousands): Real Estate Segment Debt and Preferred Equity Segment Total Company Total revenues: Years ended: December 31, 2015 $ 742,585 $ 182,648 $ 925,233 December 31, 2014, as adjusted 670,621 176,901 847,522 December 31, 2013, as adjusted $ 627,210 $ 194,612 $ 821,822 Income from continuing operations before equity in net gain on sale of interest in unconsolidated joint venture/real estate, gain on sale of real estate and depreciable real estate reserves Years ended: December 31, 2015 $ 112,564 $ 160,008 $ 272,572 December 31, 2014, as adjusted 52,431 145,673 198,104 December 31, 2013, as adjusted 25,038 165,858 190,896 Total assets As of: December 31, 2015 $ 6,816,711 $ 2,042,036 $ 8,858,747 December 31, 2014, as adjusted 6,671,984 1,631,789 8,303,773
Schedule of reconciliation of income from continuing operations to net income attributable to SL Green common stockholders	The table below reconciles income from continuing operations to net income for the years ended December 31, 2015 , 2014 and 2013 (in thousands): Year ended December 31, 2015 2014 2013 (as adjusted) (as adjusted) Income from continuing operations before equity in net gain on sale of interest in unconsolidated joint venture/real estate, gain on sale of real estate and depreciable real estate reserves $ 272,572 $ 198,104 $ 190,896 Equity in net gain on sale of interest in unconsolidated joint venture/real estate — 85,559 2,056 Gain on sale of real estate 100,190 — — Depreciable real estate reserves (9,998 ) — — Income from continuing operations 362,764 283,663 192,952 Net income from discontinued operations — 1,996 5,907 Gain on sale of discontinued operations — 117,579 13,756 Net income $ 362,764 $ 403,238 $ 212,615

Quarterly Financial Data of t42

Quarterly Financial Data of the Company (unaudited) (Tables)	12 Months Ended
	Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]
Schedule of Quarterly Financial Information	Summarized quarterly financial data for the years ended December 31, 2015 and 2014 , which is reflective of the transfer of two properties, SL Green's tenancy in common interest in a fee interest and one entity that held debt investments and financing receivables to us by SL Green, was as follows (in thousands): 2015 Quarter Ended December 31 September 30 June 30 March 31 (as adjusted) (as adjusted) (as adjusted) Total revenues $ 238,283 $ 237,651 $ 234,631 $ 214,668 Income from continuing operations before equity in net income from unconsolidated joint ventures, (loss) gain on sale of real estate, depreciable real estate reserves, unrealized gain (loss) on embedded derivative and loss on extinguishment of debt $ 69,152 $ 65,541 $ 76,236 $ 52,851 Equity in net income from unconsolidated joint ventures 2,265 2,296 2,153 2,127 (Loss) gain on sale of real estate (879 ) 101,069 — — Depreciable real estate reserves — (9,998 ) — — Unrealized gain (loss) on embedded derivative 1,800 (1,800 ) — — Loss on extinguishment of debt — — — (49 ) Net income 72,338 157,108 78,389 54,929 Net income attributable to noncontrolling interests in other partnerships (1,946 ) (293 ) (6,380 ) (550 ) Preferred units dividend (955 ) (743 ) — — Net income attributable to ROP common unitholder $ 69,437 $ 156,072 $ 72,009 $ 54,379 2014 Quarter Ended December 31 September 30 June 30 March 31 (as adjusted) (as adjusted) (as adjusted) (as adjusted) Total revenues $ 214,378 $ 212,164 $ 204,515 $ 216,465 Income from continuing operations before equity in net income (loss) from unconsolidated joint ventures, equity in net gain on sale of interest in unconsolidated joint venture, loss on extinguishment of debt, net (loss) income from discontinued operations and (loss) gain on sale of discontinued operations $ 51,940 $ 48,406 $ 44,966 $ 55,686 Equity in net income (loss) from unconsolidated joint ventures 2,177 2,075 2,626 (2,387 ) Equity in net gain on sale of interest in unconsolidated joint venture — — 86 85,473 Loss on extinguishment of debt (6,866 ) — (519 ) — Net (loss) income from discontinued operations — (58 ) 1,348 706 (Loss) gain on sale of discontinued operations — (250 ) 117,829 — Net income 47,251 50,173 166,336 139,478 Net income attributable to noncontrolling interests in other partnerships (938 ) (841 ) (801 ) (61 ) Net income attributable to ROP common unitholder $ 46,313 $ 49,332 $ 165,535 $ 139,417

Organization and Basis of Pre43

Organization and Basis of Presentation (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2015USD ($)ft²property	Dec. 31, 2014USD ($)property	Aug. 31, 2015ft²
Real estate properties
Percentage of ownership in SL Green Operating Partnership owned by SL Green Realty Corp (as a percent)	96.39%
Number of Properties Transferred by Parent Company | property	2	5
Carrying value of properties transferred by SL Green | $	$ 395,000	$ 884,300
Number of Entities Transferred by Parent Company | property	1
Carrying value of entities transferred by the parent company | $	$ 1,700,000
Number of Properties | property	43
Approximate Square Feet (sqft)	12,576,446
Weighted Average Occupancy (as a percent)	91.10%
Debt, preferred equity and other investments | $	$ 1,770,212	$ 1,508,812
131-137 Spring Street
Real estate properties
Approximate Square Feet (sqft)			68,342
Suburban
Real estate properties
Number of Properties | property	20
Approximate Square Feet (sqft)	3,339,800
Weighted Average Occupancy (as a percent)	80.30%
Office | Manhattan
Real estate properties
Number of Properties | property	16
Approximate Square Feet (sqft)	8,463,245
Weighted Average Occupancy (as a percent)	94.90%
Office | Suburban
Real estate properties
Number of Properties | property	19
Approximate Square Feet (sqft)	3,287,800
Weighted Average Occupancy (as a percent)	80.00%
Retail | 131-137 Spring Street
Real estate properties
Approximate Square Feet (sqft)	68,342
Number of properties held for sale | property	2
Retail | Manhattan
Real estate properties
Number of Properties | property	5
Approximate Square Feet (sqft)	352,892
Weighted Average Occupancy (as a percent)	97.60%
Retail | Suburban
Real estate properties
Number of Properties | property	1
Approximate Square Feet (sqft)	52,000
Weighted Average Occupancy (as a percent)	100.00%
Fee Interest | Manhattan
Real estate properties
Number of Properties | property	2
Approximate Square Feet (sqft)	197,654
Weighted Average Occupancy (as a percent)	100.00%
Commercial Properties
Real estate properties
Number of Properties | property	43
Approximate Square Feet (sqft)	12,353,591
Weighted Average Occupancy (as a percent)	91.10%
Commercial Properties | Manhattan
Real estate properties
Number of Properties | property	23
Approximate Square Feet (sqft)	9,013,791
Weighted Average Occupancy (as a percent)	95.10%
Residential | Manhattan
Real estate properties
Number of Properties | property	0
Approximate Square Feet (sqft)	222,855
Weighted Average Occupancy (as a percent)	89.50%
Dual property type, retail portion
Real estate properties
Approximate Square Feet (sqft)	270,132
Dual property type, residential portion
Real estate properties
Approximate Square Feet (sqft)	222,855

Significant Accounting Polici44

Significant Accounting Policies (Details) $ in Thousands	1 Months Ended	3 Months Ended					12 Months Ended
	Mar. 31, 2014USD ($)	Dec. 31, 2015USD ($)property	Sep. 30, 2015USD ($)	Jun. 30, 2015USD ($)	Mar. 31, 2015USD ($)	Dec. 31, 2014USD ($)	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)
Investment in Commercial Real Estate Properties
Depreciation expense (including amortization of capital lease asset)							$ 187,200	$ 184,300	$ 170,000
Impairment charge		$ 0	$ (9,998)	$ 0	$ 0		$ (9,998)	$ 0	$ 0
Number of properties expected to be sold | property		1
Maximum period of cessation of major construction activity to completion of construction project (in years)							1 year
Weighted average amortization period (in years)							4 years 4 months 24 days	13 years 3 months 18 days	11 years 10 months 24 days
Rental revenue from amortization of acquired leases		$ 24,900				$ 21,000	$ 19,000
Write-off of balances associated with former tenant									$ 6,800
Increase (decrease) in rental revenue									25,800
Increase (reduction) in interest expense from amortization of above-market rate mortgages							400	$ (2,100)	$ (2,500)
Identified intangible assets (included in other assets):
Gross amount		307,824				297,238	307,824	297,238
Accumulated amortization		(235,040)				(216,841)	(235,040)	(216,841)
Net		72,784				80,397	72,784	80,397
Identified intangible liabilities (included in deferred revenue):
Gross amount		523,228				450,326	523,228	450,326
Accumulated amortization		(346,857)				(322,694)	(346,857)	(322,694)
Net		$ 176,371				$ 127,632	$ 176,371	$ 127,632
16 Court Street
Investment in Commercial Real Estate Properties
Income from amortization of remaining value of below-market mortgage	$ 300
Above-market leases | Minimum
Investment in Commercial Real Estate Properties
Estimated useful life of intangible assets (years)							1 year
Above-market leases | Maximum
Investment in Commercial Real Estate Properties
Estimated useful life of intangible assets (years)							14 years
Below-market leases | Minimum
Investment in Commercial Real Estate Properties
Estimated useful life of intangible assets (years)							1 year
Below-market leases | Maximum
Investment in Commercial Real Estate Properties
Estimated useful life of intangible assets (years)							14 years
In-place leases | Minimum
Investment in Commercial Real Estate Properties
Estimated useful life of intangible assets (years)							1 year
In-place leases | Maximum
Investment in Commercial Real Estate Properties
Estimated useful life of intangible assets (years)							14 years
Building | Minimum
Investment in Commercial Real Estate Properties
Estimated useful life (years)							3 years
Building | Maximum
Investment in Commercial Real Estate Properties
Estimated useful life (years)							40 years
Building (leasehold interest) | Maximum
Investment in Commercial Real Estate Properties
Estimated useful life (years)							40 years
Furniture and fixtures | Minimum
Investment in Commercial Real Estate Properties
Estimated useful life (years)							4 years
Furniture and fixtures | Maximum
Investment in Commercial Real Estate Properties
Estimated useful life (years)							7 years
140 Grand Street
Investment in Commercial Real Estate Properties
Impairment charge							$ (10,000)

Significant Accounting Polici45

Significant Accounting Policies (Estimated Annual Amortization and Revenue Recognition)(Details) $ in Thousands	12 Months Ended
	Dec. 31, 2015USD ($)
Revenue Recognition
Period after which payments become due (days)	90 days
Lease Agreements
Finite-Lived Intangible Assets [Line Items]
2,016	$ 3,017
2,017	4,994
2,018	6,548
2,019	7,128
2,020	6,919
Other Identifiable Assets
Finite-Lived Intangible Assets [Line Items]
2,016	4,600
2,017	3,326
2,018	2,177
2,019	1,751
2,020	$ 1,588

Significant Accounting Polici46

Significant Accounting Policies (Concentrations of Credit Risk and Reclassification)(Details 3) - property	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Concentrations of Credit Risk
Number of Properties Transferred by Parent Company	2	5
Number of Entities Transferred by Parent Company	1
Annualized cash rent | Customer concentration
Concentrations of Credit Risk
Maximum percentage of annualized cash rent for any one tenant not individually disclosed (more than)	5.00%
Annualized cash rent | Customer concentration | 1185 Avenue of the Americas
Concentrations of Credit Risk
Percentage of concentration	15.40%
Annualized cash rent | Customer concentration | 625 Madison Avenue
Concentrations of Credit Risk
Percentage of concentration	9.70%
Annualized cash rent | Customer concentration | 919 Third Avenue
Concentrations of Credit Risk
Percentage of concentration	8.20%
Annualized cash rent | Customer concentration | 750 Third Avenue
Concentrations of Credit Risk
Percentage of concentration	7.70%
Annualized cash rent | Customer concentration | 810 Seventh Avenue
Concentrations of Credit Risk
Percentage of concentration	7.50%
Annualized cash rent | Customer concentration | 1350 Avenue of the Americas
Concentrations of Credit Risk
Percentage of concentration	7.20%
Annualized cash rent | Customer concentration | 555 W. 57th Street
Concentrations of Credit Risk
Percentage of concentration	6.70%
Annualized cash rent | Customer concentration | 125 Park Avenue
Concentrations of Credit Risk
Percentage of concentration	6.60%

Property Acquisition (Details)

Property Acquisition (Details) - USD ($) $ in Thousands	1 Months Ended					12 Months Ended
	Oct. 31, 2014	Sep. 30, 2014	Jul. 31, 2014	Nov. 30, 2013	Apr. 30, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Jul. 31, 2015
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed
Impact to rental revenue for amortization of aggregate below-market leases						$ 621,121	$ 574,150	$ 535,969
Impact to depreciation expense						202,474	$ 196,505	$ 181,619
110 Greene Street
Property Acquisition
Ownership interest in consolidated joint venture (as a percent)									90.00%
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed
Purchase price									$ 255,000
102 Greene Street
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed
Land	$ 8,215
Building and building leasehold	26,717
Above-market lease value	0
Acquired in-place lease value	1,015
Other assets, net of other liabilities	3
Assets acquired	35,950
Mark-to-market assumed debt	0
Below-market lease value	3,701
Liabilities assumed	3,701
Purchase price	32,249
Net consideration funded by us at closing, excluding consideration financed by debt	32,249
Equity and/or debt investment held	0
Debt assumed	0
635 Madison Avenue
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed
Land		$ 205,632
Building and building leasehold		15,805
Above-market lease value		0
Acquired in-place lease value		17,345
Other assets, net of other liabilities		0
Assets acquired		238,782
Mark-to-market assumed debt		0
Below-market lease value		85,036
Liabilities assumed		85,036
Purchase price		153,746
Net consideration funded by us at closing, excluding consideration financed by debt		153,746
Equity and/or debt investment held		0
Debt assumed		0
115 Spring Street
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed
Land			$ 11,078
Building and building leasehold			44,799
Above-market lease value			0
Acquired in-place lease value			2,037
Other assets, net of other liabilities			0
Assets acquired			57,914
Mark-to-market assumed debt			0
Below-market lease value			4,789
Liabilities assumed			4,789
Purchase price			53,125
Net consideration funded by us at closing, excluding consideration financed by debt			53,125
Equity and/or debt investment held			0
Debt assumed			0
Impact to rental revenue for amortization of aggregate below-market leases						1,900
Impact to depreciation expense						$ 1,100
315 West 33rd Street
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed
Land				$ 195,834
Building and building leasehold				164,429
Above-market lease value				7,084
Acquired in-place lease value				26,125
Other assets, net of other liabilities				1,142
Assets acquired				394,614
Mark-to-market assumed debt				0
Below-market lease value				7,839
Liabilities assumed				7,839
Purchase price				386,775
Net consideration funded by us at closing, excluding consideration financed by debt				386,775
Equity and/or debt investment held				0
Debt assumed				$ 0
16 Court Street
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed
Land					$ 19,217
Building and building leasehold					63,210
Above-market lease value					5,122
Acquired in-place lease value					9,422
Other assets, net of other liabilities					3,380
Assets acquired					100,351
Mark-to-market assumed debt					294
Below-market lease value					3,885
Liabilities assumed					4,179
Purchase price					96,172
Net consideration funded by us at closing, excluding consideration financed by debt					4,000
Equity and/or debt investment held					11,535
Debt assumed					84,642
Mortgage encumbering the property					$ 84,600
Scenario, Previously Reported | 102 Greene Street
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed
Land	11,300
Building and building leasehold	$ 21,000
Scenario, Previously Reported | 635 Madison Avenue
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed
Land		$ 153,700
Scenario, Previously Reported | 115 Spring Street
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed
Land			15,900
Building and building leasehold			$ 37,200
Series P Preferred Units | 110 Greene Street
Property Acquisition
Issuance of aggregate liquidation preference of preferred units									5,000
Series Q Preferred Units | 110 Greene Street
Property Acquisition
Issuance of aggregate liquidation preference of preferred units									$ 6,700

Property Dispositions (Details)

Property Dispositions (Details) $ in Thousands	1 Months Ended				3 Months Ended								12 Months Ended
	Dec. 31, 2015USD ($)ft²	Aug. 31, 2015USD ($)ft²	May. 31, 2014USD ($)ft²	Aug. 31, 2013USD ($)ft²	Dec. 31, 2015USD ($)ft²	Sep. 30, 2015USD ($)	Jun. 30, 2015USD ($)	Mar. 31, 2015USD ($)	Dec. 31, 2014USD ($)	Sep. 30, 2014USD ($)	Jun. 30, 2014USD ($)	Mar. 31, 2014USD ($)	Dec. 31, 2015USD ($)ft²	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Approximate Usable Square Feet (sqft) | ft²	12,576,446				12,576,446								12,576,446
Gain (loss) on Sale									$ 0	$ (250)	$ 117,829	$ 0	$ 0	$ 117,579	$ 13,756
Impairment charge					$ 0	$ 9,998	$ 0	$ 0					9,998	0	0
Revenues
Rental revenue														7,853	28,843
Escalation and reimbursement revenues														1,080	4,093
Other income														0	8
Total revenues														8,933	32,944
Operating expenses														1,222	6,733
Real estate taxes														1,402	4,571
Ground rent														3,001	7,974
Interest expense, net of interest income														879	2,933
Depreciation and amortization														433	4,826
Total expenses														6,937	27,037
Net income from discontinued operations													$ 0	$ 1,996	$ 5,907
140 Grand Street
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Approximate Usable Square Feet (sqft) | ft²	130,100				130,100								130,100
Sales Price	$ 22,400
Gain (loss) on Sale	$ (10,500)
Impairment charge													$ 10,000
131-137 Spring Street
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Approximate Usable Square Feet (sqft) | ft²		68,342
Sales Price		$ 277,800
Gain (loss) on Sale		101,100
Employee compensation awards accrued		$ 4,100
Ownership percentage in disposed asset		80.00%
673 First Avenue
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Approximate Usable Square Feet (sqft) | ft²			422,000
Sales Price			$ 145,000
Gain (loss) on Sale			117,600
Employee compensation awards accrued			$ 3,400
333 West 34th Street
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Approximate Usable Square Feet (sqft) | ft²				345,400
Sales Price				$ 220,300
Gain (loss) on Sale				13,800
Employee compensation awards accrued				$ 3,000

Debt, Preferred Equity and Ot49

Debt, Preferred Equity and Other Investments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Sep. 30, 2014
Debt investment
Increase in debt and preferred equity investments (net of discounts), including investments classified as held-for-sale	$ 781,400	$ 680,100
Decrease in debt and preferred equity investments (net of discounts), including investments classified as held-for-sale	$ 520,200	576,100
Aggregate weighted average current yield (as a percent)	10.23%
Debt Investments Held [Abstract]
Future Funding Obligations	$ 5,580
Senior Financing	131,669
Carrying Value	42,176	132,995
Debt investment
Debt Investments Held [Abstract]
Future Funding Obligations	131,430
Senior Financing	5,693,825
Carrying Value	1,627,844	1,275,809
Mortgage Loan, February 2019
Debt Investments Held [Abstract]
Carrying Value	0	0
Total fixed rate
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	2,762,980
Carrying Value	511,389	607,084
Total fixed rate | Junior Mortgage Participation/Mezzanine Loan, May 2016
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	0
Carrying Value	23,510	45,611
Total fixed rate | Junior Mortgage Participation, June 2016
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	133,000
Carrying Value	49,000	49,000
Total fixed rate | Mezzanine Loan, July 2016
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	115,000
Carrying Value	24,916	24,910
Total fixed rate | Mezzanine Loan, November 2016
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	165,000
Carrying Value	72,102	71,656
Total fixed rate | Junior Mortgage Participation/Mezzanine Loan, March 2017
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	1,109,000
Carrying Value	104,661	98,934
Total fixed rate | Mezzanine Loan, March 2017
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	0
Carrying Value	66,183	65,770
Total fixed rate | Mezzanine Loan, June 2017
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	502,100
Carrying Value	41,115	24,608
Amount participated out	41,300
Total fixed rate | Mezzanine Loan, July 2018
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	539,000
Carrying Value	49,691	49,629
Total fixed rate | Mortgage Loan, February 2019
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	0
Carrying Value	26,262	26,209
Loan acquired			$ 26,400
Discount amount			200
Total fixed rate | Mortgage Loan, August 2019
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	0
Carrying Value	513	637
Total fixed rate | Mezzanine Loan, September 2021
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	15,000
Carrying Value	3,500	3,500
Total fixed rate | Mezzanine Loan, November 2023
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	89,880
Carrying Value	19,936	19,930
Amount participated out	5,000
Total fixed rate | Mezzanine Loan, January 2025
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	95,000
Carrying Value	30,000	30,000
Total fixed rate | Mezzanine Loan Repaid in February 2015
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	0
Carrying Value	0	14,068
Total fixed rate | Junior Mortgage Participation Repaid in March 2015
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	0
Carrying Value	0	11,934
Total fixed rate | Junior Mortgage Participation/Mezzanine Loan Repaid in December 2015
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	0
Carrying Value	0	70,688
Total fixed rate | Junior Mortgage Participation, Sold July 2015
Debt Investments Held [Abstract]
Carrying amount of Notes	22,900
Total fixed rate | Junior Mortgage Participation, Related To Mortgage Loan, February 2019
Debt Investments Held [Abstract]
Loan acquired			5,700
Discount amount			$ 5,700
Total floating rate
Debt Investments Held [Abstract]
Future Funding Obligations	131,430
Senior Financing	2,930,845
Carrying Value	1,116,455	668,725
Total floating rate | Mezzanine Loan, November 2016
Debt Investments Held [Abstract]
Future Funding Obligations	7,942
Senior Financing	312,939
Carrying Value	66,398	0
Total floating rate | Mezzanine Loan, March 2016
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	775,000
Carrying Value	74,700	73,402
Total floating rate | Mortgage/Mezzanine Loan, April 2016
Debt Investments Held [Abstract]
Future Funding Obligations	10,156
Senior Financing	0
Carrying Value	94,901	0
Total floating rate | Mezzanine Loan, June 2016
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	160,000
Carrying Value	22,625	22,573
Amount participated out	7,400
Total floating rate | Mezzanine Loan, November 2016
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	360,000
Carrying Value	99,530	99,023
Total floating rate | Mezzanine Loan, December 2016
Debt Investments Held [Abstract]
Future Funding Obligations	11,414
Senior Financing	131,939
Carrying Value	49,751	42,750
Total floating rate | Mezzanine Loan, December 2016
Debt Investments Held [Abstract]
Future Funding Obligations	281
Senior Financing	39,201
Carrying Value	13,731	11,835
Total floating rate | Mortgage/Mezzanine Loan, January 2017
Debt Investments Held [Abstract]
Future Funding Obligations	57,108
Senior Financing	0
Carrying Value	134,264	0
Amount participated out	25,000
Total floating rate | Mezzanine Loan, January 2017
Debt Investments Held [Abstract]
Future Funding Obligations	1,293
Senior Financing	118,949
Carrying Value	28,551	20,651
Total floating rate | Mortgage/Mezzanine Loan, June 2017
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	0
Carrying Value	68,977	0
Total floating rate | Junior Mortgage Participation/Mezzanine Loan, July 2017
Debt Investments Held [Abstract]
Future Funding Obligations	1,257
Senior Financing	118,717
Carrying Value	40,346	38,524
Total floating rate | Mortgage/Mezzanine Loan, July 2017
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	0
Carrying Value	22,877	22,803
Total floating rate | Mortgage/Mezzanine Loan, September 2017
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	0
Carrying Value	16,901	16,848
Total floating rate | Mortgage/Mezzanine Loan, October 2017
Debt Investments Held [Abstract]
Future Funding Obligations	4,500
Senior Financing	0
Carrying Value	19,282	0
Total floating rate | Mezzanine Loan, November 2017
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	60,000
Carrying Value	14,904	14,859
Total floating rate | Mezzanine Loan, December 2017
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	85,000
Carrying Value	29,505	0
Total floating rate | Mezzanine Loan, December 2017
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	65,000
Carrying Value	28,563	0
Total floating rate | Mortgage/Mezzanine Loan, December 2017
Debt Investments Held [Abstract]
Future Funding Obligations	795
Senior Financing	0
Carrying Value	14,942	14,845
Amount participated out	5,100
Total floating rate | Junior Mortgage Participation, April 2018
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	40,000
Carrying Value	19,846	0
Total floating rate | Mezzanine Loan, April 2018
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	175,000
Carrying Value	34,725	0
Total floating rate | Junior Mortgage Participation/Mezzanine Loan, July 2018
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	55,000
Carrying Value	20,510	20,533
Total floating rate | Mortgage/Mezzanine Loan, August 2018
Debt Investments Held [Abstract]
Future Funding Obligations	1,500
Senior Financing	0
Carrying Value	31,210	0
Total floating rate | Mezzanine Loan, December 2018
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	33,000
Carrying Value	26,777	0
Total floating rate | Mezzanine Loan, December 2018
Debt Investments Held [Abstract]
Future Funding Obligations	6,383
Senior Financing	156,383
Carrying Value	52,774	0
Total floating rate | Mezzanine Loan, December 2018
Debt Investments Held [Abstract]
Future Funding Obligations	28,801
Senior Financing	206,717
Carrying Value	49,625	0
Total floating rate | Mortgage/Mezzanine Loan, February 2019
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	0
Carrying Value	18,395	18,083
Total floating rate | Mezzanine Loan, March 2019
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	38,000
Carrying Value	21,845	21,807
Total floating rate | Mezzanine Loan Repaid April 2015
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	0
Carrying Value	0	33,726
Total floating rate | Mezzanine Loan Repaid April 2015
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	0
Carrying Value	0	37,322
Total floating rate | Mortgage/Mezzanine Loan Repaid in August 2015
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	0
Carrying Value	0	109,527
Total floating rate | Mezzanine Loan Repaid in November 2015
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	0
Carrying Value	$ 0	$ 49,614

Debt, Preferred Equity and Ot50

Debt, Preferred Equity and Other Investments (Preferred Equity Investments)(Details) $ in Thousands	1 Months Ended	3 Months Ended	12 Months Ended
	Aug. 31, 2015USD ($)ft²	Mar. 31, 2014USD ($)	Dec. 31, 2015USD ($)ft²extenstion_optionsegment	Dec. 31, 2014USD ($)segment	Dec. 31, 2013USD ($)
Preferred Equity Investments [Line Items]
Interest rate (as a percent)			10.23%
Future Funding Obligations			$ 5,580
Senior Financing			131,669
Carrying Value			42,176	$ 132,995
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of year		$ 1,000	0	1,000	$ 7,000
Expensed			0	0	0
Recoveries			0	0	0
Charge-offs and reclassifications			0	(1,000)	(6,000)
Balance at end of period			$ 0	$ 0	$ 1,000
Number of portfolio segments of financial receivables (segment) | segment			1	1
Additional amount of financing receivables included in other assets			$ 168,300	$ 107,000
Approximate Square Feet (sqft) | ft²			12,576,446
West Coast Office Portfolio
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Ownership interest in joint venture sold (as a percent)		43.74%
Valuation of interest in joint venture sold		$ 756,000
Gain (Loss) on Sale of Unconsolidated Joint Venture		85,600
131-137 Spring Street
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Approximate Square Feet (sqft) | ft²	68,342
Ownership percentage in disposed asset	80.00%
131-137 Spring Street
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Ownership Interest (as a percent)			20.00%
Economic Interest (as a percent)			20.00%
Approximate Square Feet (sqft) | ft²			68,342
Acquisition price			$ 277,750
West Coast Office Portfolio Mortgage | Mortgages
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Floating rate debt		$ 526,300
Floating Rate Five Year Mortgage | Mortgages
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Floating rate debt	$ 141,000
Term (in Years)	5 years
Floating Rate Five Year Mortgage | Mortgages | LIBOR
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Interest rate (as a percent)	1.55%
Preferred Equity Investments
Preferred Equity Investments [Line Items]
Interest rate (as a percent)			7.86%
Preferred Equity, March 2018
Preferred Equity Investments [Line Items]
Future Funding Obligations			$ 0
Senior Financing			71,486
Carrying Value			9,967	9,954
Preferred Equity, November 2018
Preferred Equity Investments [Line Items]
Future Funding Obligations			5,580
Senior Financing			60,183
Carrying Value			32,209	0
Preferred Equity, Redeemed July 2015
Preferred Equity Investments [Line Items]
Future Funding Obligations			0
Senior Financing			0
Carrying Value			0	123,041
Mortgage Loan, February 2019
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Carrying Value			0	0
Participating Financing due March 2016
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Equity method investment			$ 100,200	$ 100,000
Number of one-year extension options | extenstion_option			2
Extension period (years)			1 year
Last extension period (years)			2 years

Mortgages and Other Loans Pay51

Mortgages and Other Loans Payable (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Mortgage note and other loan payable
Total fixed rate debt	$ 500,000,000	$ 620,000,000
Total floating rate debt	253,424,000	100,000,000
Total fixed and floating rate debt	753,424,000	720,000,000
Gross book value of the property and investment collateralizing the mortgage note and other loan payable	2,000,000,000	1,900,000,000
Master Repurchase Agreement
Mortgage note and other loan payable
Total floating rate debt	253,424,000	100,000,000
Maximum borrowing capacity	$ 300,000,000
Basis Point Fee (as a percent)	25.00%
Threshold amount for basis point fee to be applicable (less than)	$ 150,000,000
919 Third Avenue
Mortgage note and other loan payable
Total fixed rate debt	$ 500,000,000	500,000,000
Controlling interest in the joint venture (as a percent)	51.00%
711 Third Avenue
Mortgage note and other loan payable
Total fixed rate debt	$ 0	$ 120,000,000
Weighted Average | Master Repurchase Agreement
Mortgage note and other loan payable
Interest Rate (as a percent)	3.36%
Weighted Average | 919 Third Avenue
Mortgage note and other loan payable
Interest rate (as a percent)	5.12%
LIBOR | Minimum | Master Repurchase Agreement
Mortgage note and other loan payable
Interest rate (as a percent)	250.00%
LIBOR | Maximum | Master Repurchase Agreement
Mortgage note and other loan payable
Interest rate (as a percent)	325.00%

Corporate Indebtedness (Details

Corporate Indebtedness (Details) - USD ($)	1 Months Ended				12 Months Ended
	Jul. 31, 2015	Jan. 31, 2015	Nov. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Mar. 31, 2015
Corporate Indebtedness
Increase in credit facility	$ 500,000,000
Revolving credit facility					$ 994,000,000	$ 385,000,000
Debt disclosures by scheduled maturity date
Accreted Balance					1,988,106,000	1,788,001,000
Scheduled amortization and principal repayments
2,016					512,298,000
2,017					7,411,000
2,018					257,799,000
2,019					941,207,000
2,020					1,252,637,000
Thereafter					764,380,000
Total amortization of debt and principal repayments					3,735,732,000
Interest expense
Interest expense					119,360,000	129,427,000	$ 133,853,000
Interest income					(18,000)	(71,000)	(8,000)
Interest expense, net					119,342,000	129,356,000	133,845,000
Interest capitalized					1,107,000	3,753,000	$ 0
Revolving credit facility
Corporate Indebtedness
Increase in credit facility	400,000,000
Maximum borrowing capacity	1,600,000,000				1,600,000,000
Maximum borrowing capacity, optional expansion					3,000,000,000
Revolving credit facility					$ 994,000,000
Debt disclosures by scheduled maturity date
Effective Rate (as a percent)					1.45%
Scheduled amortization and principal repayments
2,016					$ 0
2,017					0
2,018					0
2,019					0
2,020					994,000,000
Thereafter					0
Total amortization of debt and principal repayments					$ 994,000,000
Revolving credit facility | Minimum
Corporate Indebtedness
Facility fee on total commitments (as a percent)					0.125%
Facility fee on total commitments, payable quarterly in arrears (as a percent)					0.25%
Revolving credit facility | Maximum
Corporate Indebtedness
Facility fee on total commitments (as a percent)					0.30%
Term loan
Corporate Indebtedness
Increase in credit facility	100,000,000		$ 50,000,000	$ 383,000,000
Maximum borrowing capacity	$ 933,000,000		$ 833,000,000		$ 933,000,000			$ 783,000,000
Decrease in interest-rate margin (as a percent)		0.20%		0.25%
Decrease in facility fee (as a percent)		0.05%
Debt disclosures by scheduled maturity date
Effective Rate (as a percent)					1.67%
Scheduled amortization and principal repayments
2,016					$ 0
2,017					0
2,018					0
2,019					933,000,000
2,020					0
Thereafter					0
Total amortization of debt and principal repayments					933,000,000
Credit Facility 2012
Corporate Indebtedness
Letters of credit					73,100,000
Ability to borrow under line of credit facility					532,900,000
Mortgage and Other Loans Payable
Scheduled Amortization
2,016					3,566,000
2,017					7,411,000
2,018					7,799,000
2,019					8,207,000
2,020					8,637,000
Thereafter					22,786,000
Total amortization of debt					58,406,000
Principal Repayments
2,016					253,424,000
2,017					0
2,018					0
2,019					0
2,020					0
Thereafter					441,594,000
Total principal repayments					695,018,000
Senior Unsecured Notes
Scheduled amortization and principal repayments
2,016					255,308,000
2,017					0
2,018					250,000,000
2,019					0
2,020					250,000,000
Thereafter					300,000,000
Total amortization of debt and principal repayments					1,055,308,000
Senior Unsecured Notes
Debt disclosures by scheduled maturity date
Unpaid Principal Balance					1,055,308,000
Accreted Balance					1,055,106,000	955,001,000
Senior Unsecured Notes | 6.00% senior unsecured notes maturing on March 31, 2016
Debt disclosures by scheduled maturity date
Unpaid Principal Balance					255,308,000
Accreted Balance					$ 255,296,000	255,250,000
Coupon Rate (as a percent)					6.00%
Effective Rate (as a percent)					6.00%
Term (in Years)					10 years
Senior Unsecured Notes | 5.00% senior unsecured notes maturing on August 15, 2018
Debt disclosures by scheduled maturity date
Unpaid Principal Balance					$ 250,000,000
Accreted Balance					$ 249,810,000	249,744,000
Coupon Rate (as a percent)					5.00%
Effective Rate (as a percent)					5.00%
Term (in Years)					7 years
Senior Unsecured Notes | 7.75% senior unsecured notes maturing on March 15, 2020
Debt disclosures by scheduled maturity date
Unpaid Principal Balance					$ 250,000,000
Accreted Balance					$ 250,000,000	250,000,000
Coupon Rate (as a percent)					7.75%
Effective Rate (as a percent)					7.75%
Term (in Years)					10 years
Senior Unsecured Notes | 4.50% senior unsecured notes maturing on December 01, 2022
Debt disclosures by scheduled maturity date
Unpaid Principal Balance					$ 200,000,000
Accreted Balance					$ 200,000,000	200,000,000
Coupon Rate (as a percent)					4.50%
Effective Rate (as a percent)					4.50%
Term (in Years)					10 years
Senior Unsecured Notes | 4.27% senior unsecured notes maturing on December 17, 2025
Debt disclosures by scheduled maturity date
Unpaid Principal Balance					$ 100,000,000
Accreted Balance					$ 100,000,000	0
Coupon Rate (as a percent)					4.27%
Effective Rate (as a percent)					4.27%
Term (in Years)					10 years
Senior Unsecured Notes | 4.00% senior unsecured notes redeemed in April 2015
Debt disclosures by scheduled maturity date
Unpaid Principal Balance					$ 0
Accreted Balance					$ 0	$ 7,000
Senior Unsecured Notes | 3.00% exchangeable senior notes due 2017
Debt disclosures by scheduled maturity date
Coupon Rate (as a percent)					3.00%
LIBOR | Revolving credit facility
Corporate Indebtedness
Interest rate added to base rate (as a percent)					1.25%
LIBOR | Revolving credit facility | Minimum
Corporate Indebtedness
Interest rate added to base rate (as a percent)					0.875%
LIBOR | Revolving credit facility | Maximum
Corporate Indebtedness
Interest rate added to base rate (as a percent)					1.55%
LIBOR | Term loan
Corporate Indebtedness
Interest rate added to base rate (as a percent)					1.40%
LIBOR | Term loan | Minimum
Corporate Indebtedness
Interest rate added to base rate (as a percent)					0.95%
LIBOR | Term loan | Maximum
Corporate Indebtedness
Interest rate added to base rate (as a percent)					1.90%

Preferred Units (Details)

Preferred Units (Details) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2015USD ($)$ / sharesshares	Aug. 31, 2015shares	Jul. 22, 2015USD ($)
Class of Stock [Line Items]
Number of company common stock issued on conversion of Series B preferred units	6.71348
Series A Preferred Units
Class of Stock [Line Items]
Fair value of embedded derivative liability | $	$ 0		$ 0
Partnership Interest | Series A Preferred Units
Class of Stock [Line Items]
Shares of common stock reserved for issuance upon redemption of units of limited partnership interest in operating partnership (shares)	109,161
Dividend rate preferred units (as a percent)	3.50%
Liquidation preference of preferred units (in dollars per share) | $ / shares	$ 1,000
Number of preferred units issued (in shares)		109,161
Annual dividends on preferred units (in dollars per share) | $ / shares	$ 35
Partnership Interest | Series B Preferred Units
Class of Stock [Line Items]
Number of preferred units issued (in shares)	0

Fair Value Measurements (Detail

Fair Value Measurements (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Fair Value of Financial Instruments
Debt and preferred equity investments	$ 42,176	$ 132,995
Other investments	168,300	107,000
Carrying Value | Level 3
Fair Value of Financial Instruments
Debt and preferred equity investments	1,670,020	1,408,804
Fixed rate debt	1,585,106	1,605,001
Variable rate debt	2,150,424	1,288,000
Total	3,735,530	2,893,001
Fair Value | Level 3
Fair Value of Financial Instruments
Fixed rate debt	1,663,078	1,737,673
Variable rate debt	2,164,673	1,331,177
Total	3,827,751	3,068,850
Fair Value | Level 3 | Minimum
Fair Value of Financial Instruments
Debt and preferred equity investments	1,700,000	1,500,000
Fair Value | Level 3 | Maximum
Fair Value of Financial Instruments
Debt and preferred equity investments	1,800,000	1,800,000
Participating Financing due March 2016
Fair Value of Financial Instruments
Equity method investment	$ 100,200	$ 100,000

Financial Instruments_ Deriva55

Financial Instruments: Derivatives and Hedging (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Derivative [Line Items]
Loss from settlement of hedges included in accumulated other comprehensive loss	$ 2,000,000	$ 2,300,000
Estimated current balance held in accumulated other comprehensive loss to be reclassified into earnings within the next 12 months	600,000
Amount of Loss Recognized in Other Comprehensive Loss (Effective Portion)	(109,000)	(135,000)	$ 0
Amount of Gain Reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion)	999,000	970,000	914,000
Amount of Gain Recognized into Income (Ineffective Portion)	3,000	$ 4,000	$ 3,000
Interest Rate Swap Expiring in June 2016
Derivative [Line Items]
Notional Value	$ 30,000,000
Strike Rate (percent)	2.295%
Fair Value	$ (241,000)

Rental Income (Details)

Rental Income (Details) - Consolidated Properties $ in Thousands	Dec. 31, 2015USD ($)
Approximate future minimum rents to be received over the next five years and thereafter for non-cancelable operating leases
2,016	$ 591,405
2,017	575,191
2,018	544,077
2,019	508,603
2,020	441,183
Thereafter	2,078,954
Total minimum lease payments	$ 4,739,413

Related Party Transactions (Det

Related Party Transactions (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Jul. 22, 2015
Related Party Transactions
Related party receivable	$ 90,000	$ 0
Affiliate
Related Party Transactions
Profit participation received from related party	3,300	3,300	$ 3,000
Alliance Building Services
Related Party Transactions
Payments made for services	9,900	9,100	9,900
SL Green
Related Party Transactions
Allocation of salary and other operating costs from related party	10,400	9,800	9,100
Insurance expense incurred	$ 6,600	$ 6,400	$ 6,200
SL Green | Notes receivable | Promissory Note due July 22, 2017
Related Party Transactions
Related party receivable				$ 90,000
Interest rate (as a percent)				6.00%

Benefit Plans Benefit Plans (Na

Benefit Plans Benefit Plans (Narrative)(Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Multi-employer plans
Plan contributions from all employers	$ 9,676	$ 9,295	$ 9,046
Health Plan
Multi-employer plans
Plan contributions from all employers	$ 1,100,000	1,000,000	923,500
Contributions by company (less than)	5.00%
Pension Plan
Multi-employer plans
Surcharge	No
Plan contributions from all employers	$ 242,300	$ 226,700	$ 221,900

Benefit Plans (Details)

Benefit Plans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Multi-employer plans
Plan contributions	$ 9,676	$ 9,295	$ 9,046
Health Plan
Multi-employer plans
Plan contributions	4,843	4,585	4,472
Other plans
Multi-employer plans
Plan contributions	3,300	3,181	3,125
Pension Plan
Multi-employer plans
Plan contributions	$ 1,533	$ 1,529	$ 1,449

Commitments and Contingencies60

Commitments and Contingencies (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2015USD ($)extenstion_option
Other Commitments [Line Items]
Minimum initial term of noncancellable operating leases (in years)	1 year
Non-cancellable operating leases
2,016	$ 20,440
2,017	20,586
2,018	20,586
2,019	20,586
2,020	20,586
Thereafter	328,088
Total minimum lease payments	$ 430,872
711 Third Avenue
Other Commitments [Line Items]
Percentage of the fee not owned by the entity	50.00%
711 Third Avenue | Through July 2016
Other Commitments [Line Items]
Required annual ground lease payments	$ 5,250
711 Third Avenue | After July 2016
Other Commitments [Line Items]
Required annual ground lease payments	5,500
461 Fifth Avenue
Other Commitments [Line Items]
Required annual ground lease payments	$ 2,100
Number of renewal options available | extenstion_option	3
Term of first renewal option (in years)	21 years
Term of second renewal option (in years)	21 years
Term of third renewal option (in years)	15 years
625 Madison Avenue
Other Commitments [Line Items]
Required annual ground lease payments	$ 4,600
Number of renewal options available | extenstion_option	2
Term of first renewal option (in years)	23 years
Term of second renewal option (in years)	23 years
1185 Avenue of the Americas
Other Commitments [Line Items]
Required annual ground lease payments	$ 6,900
Term of first renewal option (in years)	23 years

Segment Information (Details)

Segment Information (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015USD ($)	Sep. 30, 2015USD ($)	Jun. 30, 2015USD ($)	Mar. 31, 2015USD ($)	Dec. 31, 2014USD ($)	Sep. 30, 2014USD ($)	Jun. 30, 2014USD ($)	Mar. 31, 2014USD ($)	Dec. 31, 2015USD ($)segment	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)
Segment information
Number of reportable segments | segment									2
Total revenues	$ 238,283	$ 237,651	$ 234,631	$ 214,668	$ 214,378	$ 212,164	$ 204,515	$ 216,465	$ 925,233	$ 847,522	$ 821,822
Income from continuing operations before equity in net gain on sale of interest in unconsolidated joint venture/real estate, gain on sale of real estate and depreciable real estate reserves									272,572	198,104	190,896
Total assets	8,858,747				8,303,773				$ 8,858,747	8,303,773
Leverage rate assumption (as a percent)									100.00%
Equity in net gain on sale of interest in unconsolidated joint venture					0	0	86	85,473	$ 0	85,559	2,056
Gain on sale of real estate	(879)	101,069	0	0					100,190	0	0
Depreciable real estate reserves	0	(9,998)	0	0					(9,998)	0	0
Income from continuing operations									362,764	283,663	192,952
Net income from discontinued operations									0	1,996	5,907
Gain on sale of discontinued operations					0	(250)	117,829	0	0	117,579	13,756
Net income	72,338	$ 157,108	$ 78,389	$ 54,929	47,251	$ 50,173	$ 166,336	$ 139,478	362,764	403,238	212,615
Operating Segments | Real Estate Segment
Segment information
Total revenues									742,585	670,621	627,210
Income from continuing operations before equity in net gain on sale of interest in unconsolidated joint venture/real estate, gain on sale of real estate and depreciable real estate reserves									112,564	52,431	25,038
Total assets	6,816,711				6,671,984				6,816,711	6,671,984
Operating Segments | Debt and Preferred Equity Segment
Segment information
Total revenues									182,648	176,901	194,612
Income from continuing operations before equity in net gain on sale of interest in unconsolidated joint venture/real estate, gain on sale of real estate and depreciable real estate reserves									160,008	145,673	$ 165,858
Total assets	$ 2,042,036				$ 1,631,789				$ 2,042,036	$ 1,631,789

Quarterly Financial Data of t62

Quarterly Financial Data of the Company (unaudited) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]
Total revenues	$ 238,283	$ 237,651	$ 234,631	$ 214,668	$ 214,378	$ 212,164	$ 204,515	$ 216,465	$ 925,233	$ 847,522	$ 821,822
Income from continuing operations before equity in net income from unconsolidated joint ventures, (loss) gain on sale of real estate, depreciable real estate reserves, unrealized gain (loss) on embedded derivative and loss on extinguishment of debt	69,152	65,541	76,236	52,851	51,940	48,406	44,966	55,686	263,780	200,998	208,080
Equity in net income (loss) from unconsolidated joint ventures	2,265	2,296	2,153	2,127	2,177	2,075	2,626	(2,387)	8,841	4,491	(17,108)
Equity in net gain on sale of interest in unconsolidated joint venture					0	0	86	85,473	0	85,559	2,056
(Loss) gain on sale of real estate	(879)	101,069	0	0					100,190	0	0
Depreciable real estate reserves	0	(9,998)	0	0					(9,998)	0	0
Unrealized gain (loss) on embedded derivative	1,800	(1,800)	0	0
Loss on extinguishment of debt	0	0	0	(49)	(6,866)	0	(519)	0	(49)	(7,385)	(76)
Net (loss) income from discontinued operations					0	(58)	1,348	706
(Loss) gain on sale of discontinued operations					0	(250)	117,829	0	0	117,579	13,756
Net income	72,338	157,108	78,389	54,929	47,251	50,173	166,336	139,478	362,764	403,238	212,615
Net income attributable to noncontrolling interests in other partnerships	(1,946)	(293)	(6,380)	(550)	(938)	(841)	(801)	(61)	(9,169)	(2,641)	(5,200)
Preferred units dividend	(955)	(743)	0	0					(1,698)	0	0
Net income attributable to ROP common unitholder	$ 69,437	$ 156,072	$ 72,009	$ 54,379	$ 46,313	$ 49,332	$ 165,535	$ 139,417	$ 351,897	$ 400,597	$ 207,415

Schedule II - Valuation and Q63

Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Tenant and other receivables—allowance
Changes in valuation allowance
Balance at Beginning of Year	$ 5,820	$ 5,382	$ 5,681
Additions Charged Against Operations/Recovery	4,363	5,635	4,459
Uncollectible Accounts Written-off	(4,590)	(5,197)	(4,758)
Balance at End of Year	5,593	5,820	5,382
Deferred rent receivable—allowance
Changes in valuation allowance
Balance at Beginning of Year	17,745	18,829	19,789
Additions Charged Against Operations/Recovery	1,775	2,916	4,577
Uncollectible Accounts Written-off	(4,732)	(4,000)	(5,537)
Balance at End of Year	$ 14,788	$ 17,745	$ 18,829

Schedule III - Real Estate An64

Schedule III - Real Estate And Accumulated Depreciation (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Real Estate And Accumulated Depreciation
Encumbrances	$ 500,000
Initial Cost
Land	1,869,857
Building & Improvements	4,946,855
Cost Capitalized Subsequent To Acquisition
Land	7,635
Building & Improvements	603,896
Gross Amount at Which Carried at Close of Period
Land	1,877,492
Building & Improvements	5,550,751
Total	7,428,243	$ 7,203,216	$ 6,670,210	$ 6,289,687
Accumulated Depreciation	1,267,598	$ 1,123,412	$ 983,273	$ 848,077
810 Seventh Avenue
Real Estate And Accumulated Depreciation
Encumbrances	0
Initial Cost
Land	114,077
Building & Improvements	476,386
Cost Capitalized Subsequent To Acquisition
Land	0
Building & Improvements	65,604
Gross Amount at Which Carried at Close of Period
Land	114,077
Building & Improvements	541,990
Total	656,067
Accumulated Depreciation	131,946
461 Fifth Avenue
Real Estate And Accumulated Depreciation
Encumbrances	0
Initial Cost
Land	0
Building & Improvements	62,695
Cost Capitalized Subsequent To Acquisition
Land	0
Building & Improvements	11,527
Gross Amount at Which Carried at Close of Period
Land	0
Building & Improvements	74,222
Total	74,222
Accumulated Depreciation	24,449
750 Third Avenue
Real Estate And Accumulated Depreciation
Encumbrances	0
Initial Cost
Land	51,093
Building & Improvements	205,972
Cost Capitalized Subsequent To Acquisition
Land	0
Building & Improvements	37,283
Gross Amount at Which Carried at Close of Period
Land	51,093
Building & Improvements	243,255
Total	294,348
Accumulated Depreciation	78,460
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
Land	0
Building & Improvements	24,315
Gross Amount at Which Carried at Close of Period
Land	223,529
Building & Improvements	1,057,513
Total	1,281,042
Accumulated Depreciation	$ 245,932
Interest in property (as a percent)	51.00%
555 W. 57th Street
Real Estate And Accumulated Depreciation
Encumbrances	$ 0
Initial Cost
Land	18,846
Building & Improvements	78,704
Cost Capitalized Subsequent To Acquisition
Land	0
Building & Improvements	50,261
Gross Amount at Which Carried at Close of Period
Land	18,846
Building & Improvements	128,965
Total	147,811
Accumulated Depreciation	53,036
1185 Avenue of the Americas
Real Estate And Accumulated Depreciation
Encumbrances	0
Initial Cost
Land	0
Building & Improvements	728,213
Cost Capitalized Subsequent To Acquisition
Land	0
Building & Improvements	36,857
Gross Amount at Which Carried at Close of Period
Land	0
Building & Improvements	765,070
Total	765,070
Accumulated Depreciation	198,483
1350 Avenue of the Americas
Real Estate And Accumulated Depreciation
Encumbrances	0
Initial Cost
Land	91,038
Building & Improvements	380,744
Cost Capitalized Subsequent To Acquisition
Land	0
Building & Improvements	32,612
Gross Amount at Which Carried at Close of Period
Land	91,038
Building & Improvements	413,356
Total	504,394
Accumulated Depreciation	102,335
1100 King Street - 1-6 International Drive
Real Estate And Accumulated Depreciation
Encumbrances	0
Initial Cost
Land	49,392
Building & Improvements	104,376
Cost Capitalized Subsequent To Acquisition
Land	2,473
Building & Improvements	17,612
Gross Amount at Which Carried at Close of Period
Land	51,865
Building & Improvements	121,988
Total	173,853
Accumulated Depreciation	31,007
520 White Plains Road
Real Estate And Accumulated Depreciation
Encumbrances	0
Initial Cost
Land	6,324
Building & Improvements	26,096
Cost Capitalized Subsequent To Acquisition
Land	0
Building & Improvements	6,720
Gross Amount at Which Carried at Close of Period
Land	6,324
Building & Improvements	32,816
Total	39,140
Accumulated Depreciation	8,617
115-117 Stevens Avenue
Real Estate And Accumulated Depreciation
Encumbrances	0
Initial Cost
Land	5,933
Building & Improvements	23,826
Cost Capitalized Subsequent To Acquisition
Land	0
Building & Improvements	5,797
Gross Amount at Which Carried at Close of Period
Land	5,933
Building & Improvements	29,623
Total	35,556
Accumulated Depreciation	7,916
100 Summit Lake Drive
Real Estate And Accumulated Depreciation
Encumbrances	0
Initial Cost
Land	10,526
Building & Improvements	43,109
Cost Capitalized Subsequent To Acquisition
Land	0
Building & Improvements	7,402
Gross Amount at Which Carried at Close of Period
Land	10,526
Building & Improvements	50,511
Total	61,037
Accumulated Depreciation	13,567
200 Summit Lake Drive
Real Estate And Accumulated Depreciation
Encumbrances	0
Initial Cost
Land	11,183
Building & Improvements	47,906
Cost Capitalized Subsequent To Acquisition
Land	0
Building & Improvements	8,223
Gross Amount at Which Carried at Close of Period
Land	11,183
Building & Improvements	56,129
Total	67,312
Accumulated Depreciation	14,714
500 Summit Lake Drive
Real Estate And Accumulated Depreciation
Encumbrances	0
Initial Cost
Land	9,777
Building & Improvements	39,048
Cost Capitalized Subsequent To Acquisition
Land	0
Building & Improvements	5,456
Gross Amount at Which Carried at Close of Period
Land	9,777
Building & Improvements	44,504
Total	54,281
Accumulated Depreciation	10,557
360 Hamilton Avenue
Real Estate And Accumulated Depreciation
Encumbrances	0
Initial Cost
Land	29,497
Building & Improvements	118,250
Cost Capitalized Subsequent To Acquisition
Land	0
Building & Improvements	12,515
Gross Amount at Which Carried at Close of Period
Land	29,497
Building & Improvements	130,765
Total	160,262
Accumulated Depreciation	31,927
7 Landmark Square
Real Estate And Accumulated Depreciation
Encumbrances	0
Initial Cost
Land	2,088
Building & Improvements	7,748
Cost Capitalized Subsequent To Acquisition
Land	(367)
Building & Improvements	84
Gross Amount at Which Carried at Close of Period
Land	1,721
Building & Improvements	7,832
Total	9,553
Accumulated Depreciation	799
680 Washington Boulevard
Real Estate And Accumulated Depreciation
Encumbrances	0
Initial Cost
Land	11,696
Building & Improvements	45,364
Cost Capitalized Subsequent To Acquisition
Land	0
Building & Improvements	5,818
Gross Amount at Which Carried at Close of Period
Land	11,696
Building & Improvements	51,182
Total	62,878
Accumulated Depreciation	$ 12,783
Interest in property (as a percent)	51.00%
750 Washington Boulevard
Real Estate And Accumulated Depreciation
Encumbrances	$ 0
Initial Cost
Land	16,916
Building & Improvements	68,849
Cost Capitalized Subsequent To Acquisition
Land	0
Building & Improvements	6,459
Gross Amount at Which Carried at Close of Period
Land	16,916
Building & Improvements	75,308
Total	92,224
Accumulated Depreciation	$ 17,391
Interest in property (as a percent)	51.00%
1010 Washington Boulevard
Real Estate And Accumulated Depreciation
Encumbrances	$ 0
Initial Cost
Land	7,747
Building & Improvements	30,423
Cost Capitalized Subsequent To Acquisition
Land	0
Building & Improvements	5,223
Gross Amount at Which Carried at Close of Period
Land	7,747
Building & Improvements	35,646
Total	43,393
Accumulated Depreciation	8,732
1055 Washington Boulevard
Real Estate And Accumulated Depreciation
Encumbrances	0
Initial Cost
Land	13,516
Building & Improvements	53,228
Cost Capitalized Subsequent To Acquisition
Land	0
Building & Improvements	5,297
Gross Amount at Which Carried at Close of Period
Land	13,516
Building & Improvements	58,525
Total	72,041
Accumulated Depreciation	13,747
400 Summit Lake Drive
Real Estate And Accumulated Depreciation
Encumbrances	0
Initial Cost
Land	38,889
Building & Improvements	0
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
Accumulated Depreciation	1
609 Fifth Avenue
Real Estate And Accumulated Depreciation
Encumbrances	0
Initial Cost
Land	36,677
Building & Improvements	145,954
Cost Capitalized Subsequent To Acquisition
Land	0
Building & Improvements	8,157
Gross Amount at Which Carried at Close of Period
Land	36,677
Building & Improvements	154,111
Total	190,788
Accumulated Depreciation	37,473
110 East 42nd Street
Real Estate And Accumulated Depreciation
Encumbrances	0
Initial Cost
Land	34,000
Building & Improvements	46,411
Cost Capitalized Subsequent To Acquisition
Land	0
Building & Improvements	15,868
Gross Amount at Which Carried at Close of Period
Land	34,000
Building & Improvements	62,279
Total	96,279
Accumulated Depreciation	12,203
304 Park Avenue South
Real Estate And Accumulated Depreciation
Encumbrances	0
Initial Cost
Land	54,189
Building & Improvements	75,619
Cost Capitalized Subsequent To Acquisition
Land	300
Building & Improvements	8,122
Gross Amount at Which Carried at Close of Period
Land	54,489
Building & Improvements	83,741
Total	138,230
Accumulated Depreciation	10,341
635 Sixth Avenue
Real Estate And Accumulated Depreciation
Encumbrances	0
Initial Cost
Land	24,180
Building & Improvements	37,158
Cost Capitalized Subsequent To Acquisition
Land	163
Building & Improvements	49,534
Gross Amount at Which Carried at Close of Period
Land	24,343
Building & Improvements	86,692
Total	111,035
Accumulated Depreciation	1,462
641 Sixth Avenue
Real Estate And Accumulated Depreciation
Encumbrances	0
Initial Cost
Land	45,668
Building & Improvements	67,316
Cost Capitalized Subsequent To Acquisition
Land	308
Building & Improvements	1,888
Gross Amount at Which Carried at Close of Period
Land	45,976
Building & Improvements	69,204
Total	115,180
Accumulated Depreciation	7,308
315 West 33rd Street
Real Estate And Accumulated Depreciation
Encumbrances	0
Initial Cost
Land	195,834
Building & Improvements	164,429
Cost Capitalized Subsequent To Acquisition
Land	0
Building & Improvements	6,173
Gross Amount at Which Carried at Close of Period
Land	195,834
Building & Improvements	170,602
Total	366,436
Accumulated Depreciation	10,246
16 Court Street
Real Estate And Accumulated Depreciation
Encumbrances	0
Initial Cost
Land	19,217
Building & Improvements	63,210
Cost Capitalized Subsequent To Acquisition
Land	0
Building & Improvements	10,854
Gross Amount at Which Carried at Close of Period
Land	19,217
Building & Improvements	74,064
Total	93,281
Accumulated Depreciation	7,393
125 Chubb Way
Real Estate And Accumulated Depreciation
Encumbrances	0
Initial Cost
Land	5,884
Building & Improvements	25,958
Cost Capitalized Subsequent To Acquisition
Land	0
Building & Improvements	24,482
Gross Amount at Which Carried at Close of Period
Land	5,884
Building & Improvements	50,440
Total	56,324
Accumulated Depreciation	7,200
Williamsburg
Real Estate And Accumulated Depreciation
Encumbrances	0
Initial Cost
Land	3,677
Building & Improvements	14,708
Cost Capitalized Subsequent To Acquisition
Land	2,523
Building & Improvements	(4,550)
Gross Amount at Which Carried at Close of Period
Land	6,200
Building & Improvements	10,158
Total	16,358
Accumulated Depreciation	1,343
115 Spring Street
Real Estate And Accumulated Depreciation
Encumbrances	0
Initial Cost
Land	11,078
Building & Improvements	44,799
Cost Capitalized Subsequent To Acquisition
Land	0
Building & Improvements	247
Gross Amount at Which Carried at Close of Period
Land	11,078
Building & Improvements	45,046
Total	56,124
Accumulated Depreciation	1,788
635 Madison Avenue
Real Estate And Accumulated Depreciation
Encumbrances	0
Initial Cost
Land	205,632
Building & Improvements	15,805
Cost Capitalized Subsequent To Acquisition
Land	0
Building & Improvements	0
Gross Amount at Which Carried at Close of Period
Land	205,632
Building & Improvements	15,805
Total	221,437
Accumulated Depreciation	515
125 Park Avenue
Real Estate And Accumulated Depreciation
Encumbrances	0
Initial Cost
Land	120,900
Building & Improvements	189,714
Cost Capitalized Subsequent To Acquisition
Land	0
Building & Improvements	55,365
Gross Amount at Which Carried at Close of Period
Land	120,900
Building & Improvements	245,079
Total	365,979
Accumulated Depreciation	43,887
625 Madison Avenue
Real Estate And Accumulated Depreciation
Encumbrances	0
Initial Cost
Land	0
Building & Improvements	246,673
Cost Capitalized Subsequent To Acquisition
Land	0
Building & Improvements	38,779
Gross Amount at Which Carried at Close of Period
Land	0
Building & Improvements	285,452
Total	285,452
Accumulated Depreciation	87,625
102 Greene Street
Real Estate And Accumulated Depreciation
Encumbrances	0
Initial Cost
Land	8,215
Building & Improvements	26,717
Cost Capitalized Subsequent To Acquisition
Land	0
Building & Improvements	277
Gross Amount at Which Carried at Close of Period
Land	8,215
Building & Improvements	26,994
Total	35,209
Accumulated Depreciation	847
711 Third Avenue
Real Estate And Accumulated Depreciation
Encumbrances	0
Initial Cost
Land	19,844
Building & Improvements	42,499
Cost Capitalized Subsequent To Acquisition
Land	0
Building & Improvements	38,618
Gross Amount at Which Carried at Close of Period
Land	19,844
Building & Improvements	81,117
Total	100,961
Accumulated Depreciation	$ 29,741
Interest in property (as a percent)	50.00%
752 Madison Avenue
Real Estate And Accumulated Depreciation
Encumbrances	$ 0
Initial Cost
Land	282,415
Building & Improvements	0
Cost Capitalized Subsequent To Acquisition
Land	1,871
Building & Improvements	0
Gross Amount at Which Carried at Close of Period
Land	284,286
Building & Improvements	0
Total	284,286
Accumulated Depreciation	0
110 Greene Street
Real Estate And Accumulated Depreciation
Encumbrances	0
Initial Cost
Land	89,250
Building & Improvements	165,750
Cost Capitalized Subsequent To Acquisition
Land	0
Building & Improvements	324
Gross Amount at Which Carried at Close of Period
Land	89,250
Building & Improvements	166,074
Total	255,324
Accumulated Depreciation	$ 1,827
Interest in property (as a percent)	90.00%
Other
Real Estate And Accumulated Depreciation
Encumbrances	$ 0
Initial Cost
Land	1,130
Building & Improvements	0
Cost Capitalized Subsequent To Acquisition
Land	79
Building & Improvements	4,692
Gross Amount at Which Carried at Close of Period
Land	1,209
Building & Improvements	4,692
Total	5,901
Accumulated Depreciation	$ 0

Schedule III - Real Estate An65

Schedule III - Real Estate And Accumulated Depreciation (Changes in Real Estate and Accumulated Depreciation)(Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Changes in real estate
Balance at beginning of year	$ 7,203,216	$ 6,670,210	$ 6,289,687
Acquisitions	329,996	491,023	479,236
Improvements	93,439	102,530	110,054
Retirements/disposals	(198,408)	(60,547)	(208,767)
Balance at end of year	7,428,243	7,203,216	6,670,210
Aggregate cost of land, buildings and improvements, before depreciation, for Federal income tax purposes	5,100,000
Changes in accumulated depreciation, exclusive of amounts relating to equipment, autos, and furniture and fixtures
Balance at beginning of year	1,123,412	983,273	848,077
Depreciation for year	175,039	165,840	160,539
Retirements/disposals	(30,853)	(25,701)	(25,343)
Balance at end of year	$ 1,267,598	$ 1,123,412	$ 983,273