SL Green Operating Partnership 10-Q 7 Aug 15 2015 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2015	Aug. 03, 2015
Document Information [Line Items]
Entity Registrant Name	SL GREEN REALTY CORP
Entity Central Index Key	1,040,971
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Jun. 30, 2015
Document Fiscal Year Focus	2,015
Document Fiscal Period Focus (Q1,Q2,Q3,FY)	Q2
Amendment Flag	false
Entity Common Stock, Shares Outstanding		99,614,410
SL Green Operating Partnership
Document Information [Line Items]
Entity Registrant Name	SL GREEN OPERATING PARTNERSHIP, LP.
Entity Central Index Key	1,492,869
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Document Type	10-Q
Document Period End Date	Jun. 30, 2015
Document Fiscal Year Focus	2,015
Document Fiscal Period Focus (Q1,Q2,Q3,FY)	Q2
Amendment Flag	false
Entity Common Stock, Shares Outstanding		1,005,426

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Commercial real estate properties, at cost:
Land and land interests	$ 3,756,488	$ 3,844,518
Building and improvements	8,397,117	8,778,593
Building leasehold and improvements	1,424,822	1,418,585
Property under capital lease	27,445	27,445
Total commercial real estate properties, at cost	13,605,872	14,069,141
Less: accumulated depreciation	(2,081,646)	(1,905,165)
Total commercial real estate properties, net	11,524,226	12,163,976
Assets held for sale	420,569	462,430
Cash and cash equivalents	215,896	281,409
Restricted cash	128,234	149,176
Investment in marketable securities	46,251	39,429
Tenant and other receivables, net of allowance of $16,369 and $18,068 in 2015 and 2014, respectively	64,873	57,369
Related party receivables	11,395	11,735
Deferred rents receivable, net of allowance of $23,656 and $27,411 in 2015 and 2014, respectively	433,999	374,944
Debt and preferred equity investments, net of discounts and deferred origination fees of $18,867 and $19,172 in 2015 and 2014, respectively	1,685,234	1,408,804
Investments in unconsolidated joint ventures	1,262,723	1,172,020
Deferred costs, net	328,838	327,962
Other assets	1,144,720	647,333
Total assets	17,266,958	17,096,587
Liabilities
Mortgages and other loans payable	5,287,934	5,586,709
Revolving credit facility	705,000	385,000
Term loan and senior unsecured notes	2,113,050	2,107,078
Accrued interest payable and other liabilities	161,188	137,634
Accounts payable and accrued expenses	147,028	173,246
Deferred revenue	337,571	187,148
Capital lease obligations	21,013	20,822
Deferred land leases payable	1,387	1,215
Dividend and distributions payable	66,026	64,393
Security deposits	67,985	66,614
Liabilities related to assets held for sale	178,252	266,873
Junior subordinated deferrable interest debentures held by trusts that issued trust preferred securities	100,000	100,000
Total liabilities	$ 9,186,434	$ 9,096,732
Commitments and contingencies
Noncontrolling interests in Operating Partnership	$ 431,418	$ 469,524
Preferred units	124,723	71,115
Equity
Common stock, $0.01 par value, 160,000 shares authorized and 103,233 and 100,928 issued and outstanding at June 30, 2015 and December 31, 2014, respectively (including 3,643 and 3,603 shares held in Treasury at June 30, 2015 and December 31, 2014, respectively)	1,033	1,010
Additional paid-in-capital	5,570,746	5,289,479
Treasury stock at cost	(325,207)	(320,471)
Accumulated other comprehensive loss	(10,906)	(6,980)
Retained earnings	1,657,911	1,752,404
Total SL Green stockholders' equity	7,115,509	6,937,374
Noncontrolling interests in other partnerships	408,874	521,842
Total equity	7,524,383	7,459,216
SL Green stockholders equity:
Total liabilities and equity	17,266,958	17,096,587
Series I Preferred Stock
Equity
Series I Preferred Stock, $0.01 par value, $25.00 liquidation preference, 9,200 issued and outstanding at both June 30, 2015 and December 31, 2014	221,932	221,932
SL Green Operating Partnership
Commercial real estate properties, at cost:
Land and land interests	3,756,488	3,844,518
Building and improvements	8,397,117	8,778,593
Building leasehold and improvements	1,424,822	1,418,585
Property under capital lease	27,445	27,445
Total commercial real estate properties, at cost	13,605,872	14,069,141
Less: accumulated depreciation	(2,081,646)	(1,905,165)
Total commercial real estate properties, net	11,524,226	12,163,976
Assets held for sale	420,569	462,430
Cash and cash equivalents	215,896	281,409
Restricted cash	128,234	149,176
Investment in marketable securities	46,251	39,429
Tenant and other receivables, net of allowance of $16,369 and $18,068 in 2015 and 2014, respectively	64,873	57,369
Related party receivables	11,395	11,735
Deferred rents receivable, net of allowance of $23,656 and $27,411 in 2015 and 2014, respectively	433,999	374,944
Debt and preferred equity investments, net of discounts and deferred origination fees of $18,867 and $19,172 in 2015 and 2014, respectively	1,685,234	1,408,804
Investments in unconsolidated joint ventures	1,262,723	1,172,020
Deferred costs, net	328,838	327,962
Other assets	1,144,720	647,333
Total assets	17,266,958	17,096,587
Liabilities
Mortgages and other loans payable	5,287,934	5,586,709
Revolving credit facility	705,000	385,000
Term loan and senior unsecured notes	2,113,050	2,107,078
Accrued interest payable and other liabilities	161,188	137,634
Accounts payable and accrued expenses	147,028	173,246
Deferred revenue	337,571	187,148
Capital lease obligations	21,013	20,822
Deferred land leases payable	1,387	1,215
Dividend and distributions payable	66,026	64,393
Security deposits	67,985	66,614
Liabilities related to assets held for sale	178,252	266,873
Junior subordinated deferrable interest debentures held by trusts that issued trust preferred securities	100,000	100,000
Total liabilities	$ 9,186,434	$ 9,096,732
Commitments and contingencies
Preferred units	$ 124,723	$ 71,115
Equity
Accumulated other comprehensive loss	(11,340)	(7,256)
SL Green stockholders equity:
SL Green partners' capital (1,035 and 1,013 general partner common units and 98,555 and 96,312 limited partner common units outstanding at June 30, 2015 and December 31, 2014, respectively)	7,240,315	7,078,924
Limited partner interests in SLGOP (3,907 and 3,973 limited partner common units outstanding at June 30, 2015 and December 31, 2014, respectively)	96,020	113,298
Total SLGOP partners' capital	7,546,927	7,406,898
Noncontrolling interests in other partnerships	408,874	521,842
Total capital	7,955,801	7,928,740
Total liabilities and equity	17,266,958	17,096,587
SL Green Operating Partnership | Series I Preferred Stock
SL Green stockholders equity:
Series I Preferred Units, $25.00 liquidation preference, 9,200 issued and outstanding at both June 30, 2015 and December 31, 2014	221,932	221,932
Total capital	$ 221,932	$ 221,932

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Tenant and other receivables, allowance	$ 16,369	$ 18,068
Deferred rents receivable, allowance	23,656	27,411
Debt and preferred equity investments, discount	$ 18,867	$ 19,172
Preferred stock, par value (in dollars per share)	$ 0.01
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	160,000,000	160,000,000
Common stock, shares issued	103,233,000	100,928,000
Common stock, shares outstanding	103,233,000	100,928,000
Treasury stock, shares	3,643,000	3,603,000
Series I Preferred Stock
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, liquidation preference (in dollars per share)	$ 25	$ 25
Preferred stock, shares issued	9,200,000	9,200,000
Preferred stock, shares outstanding	9,200,000	9,200,000
SL Green Operating Partnership
Tenant and other receivables, allowance	$ 16,639	$ 18,068
Deferred rents receivable, allowance	23,656	27,411
Debt and preferred equity investments, discount	$ 18,867	$ 19,172
SL Green partner's capital, general partner common units outstanding (shares)	1,035,000	1,013,000
SL Green partners' capital, limited partner common units outstanding (shares)	98,555,000	96,312,000
Limited partner interests in Operating Partnership, limited partner common units outstanding (shares)	3,907,000	3,973,000
SL Green Operating Partnership | Series I Preferred Stock
Preferred units, liquidation preference (in dollars per share)	$ 25	$ 25
Preferred units, shares issued	9,200,000	9,200,000
Preferred units, shares outstanding	9,200,000	9,200,000

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Revenues
Rental revenue, net	$ 304,226	$ 279,608	$ 607,555	$ 535,584
Escalation and reimbursement	41,407	38,576	82,376	76,383
Investment income	45,191	39,714	87,260	93,798
Other income	18,250	22,734	28,182	37,312
Total revenues	409,074	380,632	805,373	743,077
Expenses
Operating expenses, including $4,472 and $8,189 in 2015 and $4,567 and $8,080 in 2014 of related party expenses	70,114	69,098	146,891	139,010
Real estate taxes	56,286	51,804	112,009	104,154
Ground rent	8,086	8,040	16,274	16,073
Interest expense, net of interest income	75,746	77,870	151,553	154,048
Amortization of deferred financing costs	5,952	5,401	12,567	9,058
Depreciation and amortization	199,565	93,379	307,902	179,894
Transaction related costs	3,067	1,697	4,210	4,171
Marketing, general and administrative	23,200	23,872	48,664	47,128
Total expenses	442,016	331,161	800,070	653,536
(Loss) income from continuing operations before equity in net income from unconsolidated joint ventures, equity in net gain on sale of interest in unconsolidated joint venture/real estate, purchase price fair value adjustment and loss on early extinguishment of debt	(32,942)	49,471	5,303	89,541
Equity in net income from unconsolidated joint ventures	2,994	8,619	7,024	14,748
Equity in net gain on sale of interest in unconsolidated joint venture/real estate	769	1,444	769	106,084
Purchase price fair value adjustment	0	71,446	0	71,446
Loss on early extinguishment of debt	0	(1,028)	(49)	(1,025)
(Loss) income from continuing operations	(29,179)	129,952	13,047	280,794
Net income from discontinued operations	0	5,645	427	11,414
Gain on sale of discontinued operations	0	114,735	12,983	114,735
Net (loss) income	(29,179)	250,332	26,457	406,943
Net loss (income) attributable to noncontrolling interests:
Noncontrolling interests in the Operating Partnership	1,577	(8,645)	(166)	(13,374)
Net income attributable to noncontrolling interests in other partnerships	(6,626)	(1,843)	(12,553)	(3,333)
Preferred units distributions	(1,140)	(565)	(2,091)	(1,130)
Net income attributable to SL Green/SLGOP	(35,368)	239,279	11,647	389,106
Perpetual preferred stock dividends	(3,738)	(3,738)	(7,476)	(7,475)
Amounts attributable to SL Green common stockholders:
(Loss) income from continuing operations before purchase price fair value adjustment, gains on sale and discontinued operations	(39,846)	49,134	(9,467)	88,234
Purchase price fair value adjustment	0	68,909	0	69,027
Equity in net gain on sale of interest in unconsolidated joint venture/real estate	740	1,393	740	102,492
Net income from discontinued operations	0	5,445	411	11,028
Gain on sale of discontinued operations	0	110,660	12,487	110,850
Net (loss) income attributable to SL Green common stockholders	$ (39,106)	$ 235,541	$ 4,171	$ 381,631
Basic earnings per share:
(Loss) income from continuing operations before purchase price fair value adjustment, gains on sale and discontinued operations (usd per share)	$ (0.40)	$ 0.52	$ (0.10)	$ 0.93
Purchase price fair value adjustment - net of OP (in usd per share)	0	0.72	0	0.72
Equity in net gain on sale of interest in unconsolidated joint venture/real estate (usd per share)	0.01	0.02	0.01	1.08
Net income from discontinued operations (usd per share)	0	0.05	0	0.12
Gain on sale of discontinued operations (usd per share)	0	1.16	0.13	1.16
Net income attributable to SL Green common stockholders (usd per share)	(0.39)	2.47	0.04	4.01
Diluted earnings per share:
(Loss) income from continuing operations before purchase price fair value adjustment, gains on sale and discontinued operations (usd per share)	(0.40)	0.51	(0.10)	0.92
Purchase price fair value adjustment (in usd per share)	0	0.72	0	0.72
Equity in net gain on sale of interest in unconsolidated joint venture/real estate (usd per share)	0.01	0.02	0.01	1.07
Net income from discontinued operations (usd per share)	0	0.06	0	0.12
Gain on sale of discontinued operations (usd per share)	0	1.15	0.13	1.16
Net income attributable to SL Green common stockholders (usd per share)	(0.39)	2.46	0.04	3.99
Dividends per share/unit (in usd per share)	$ 0.60	$ 0.50	$ 1.2	$ 1
Basic weighted average common shares outstanding (shares)	99,579	95,455	98,994	95,288
Diluted weighted average common shares and common share equivalents outstanding (in shares)	99,579	99,484	103,423	99,128
SL Green Operating Partnership
Revenues
Rental revenue, net	$ 304,226	$ 279,608	$ 607,555	$ 535,584
Escalation and reimbursement	41,407	38,576	82,376	76,383
Investment income	45,191	39,714	87,260	93,798
Other income	18,250	22,734	28,182	37,312
Total revenues	409,074	380,632	805,373	743,077
Expenses
Operating expenses, including $4,472 and $8,189 in 2015 and $4,567 and $8,080 in 2014 of related party expenses	70,114	69,098	146,891	139,010
Real estate taxes	56,286	51,804	112,009	104,154
Ground rent	8,086	8,040	16,274	16,073
Interest expense, net of interest income	75,746	77,870	151,553	154,048
Amortization of deferred financing costs	5,952	5,401	12,567	9,058
Depreciation and amortization	199,565	93,379	307,902	179,894
Transaction related costs	3,067	1,697	4,210	4,171
Marketing, general and administrative	23,200	23,872	48,664	47,128
Total expenses	442,016	331,161	800,070	653,536
(Loss) income from continuing operations before equity in net income from unconsolidated joint ventures, equity in net gain on sale of interest in unconsolidated joint venture/real estate, purchase price fair value adjustment and loss on early extinguishment of debt	(32,942)	49,471	5,303	89,541
Equity in net income from unconsolidated joint ventures	2,994	8,619	7,024	14,748
Equity in net gain on sale of interest in unconsolidated joint venture/real estate	769	1,444	769	106,084
Purchase price fair value adjustment	0	71,446	0	71,446
Loss on early extinguishment of debt	0	(1,028)	(49)	(1,025)
(Loss) income from continuing operations	(29,179)	129,952	13,047	280,794
Net income from discontinued operations	0	5,645	427	11,414
Gain on sale of discontinued operations	0	114,735	12,983	114,735
Net (loss) income	(29,179)	250,332	26,457	406,943
Net loss (income) attributable to noncontrolling interests:
Net income attributable to noncontrolling interests in other partnerships	(6,626)	(1,843)	(12,553)	(3,333)
Preferred unit distributions	(1,140)	(565)	(2,091)	(1,130)
Net income attributable to SL Green/SLGOP	(36,945)	247,924	11,813	402,480
Perpetual preferred unit distributions	(3,738)	(3,738)	(7,476)	(7,475)
Net (loss) income attributable to SLGOP common unitholders	(40,683)	244,186	4,337	395,005
Amounts attributable to SL Green common stockholders:
(Loss) income from continuing operations before purchase price fair value adjustment, gains on sale and discontinued operations	(41,452)	50,916	(9,842)	91,326
Purchase price fair value adjustment	0	71,446	0	71,446
Equity in net gain on sale of interest in unconsolidated joint venture/real estate	769	1,444	769	106,084
Net income from discontinued operations	0	5,645	427	11,414
Gain on sale of discontinued operations	$ 0	$ 114,735	$ 12,983	$ 114,735
Basic earnings per share:
(Loss) income from continuing operations before gains on sale and discontinued operations (in dollars per share)	$ (0.40)	$ 0.52	$ (0.10)	$ 0.93
Purchase price value adjustment (in usd per share)	0	0.72	0	0.72
Equity in net gain on sale of interest in unconsolidated joint venture/real estate (usd per share)	0.01	0.02	0.01	1.08
Net income from discontinued operations (in dollars per share)	0	0.05	0	0.12
Gain on sale of discontinued operations (usd per share)	0	1.16	0.13	1.16
Net income attributable to SLGOP common unitholders (in dollars per share)	(0.39)	2.47	0.04	4.01
Diluted earnings per share:
(Loss) income from continuing operations before gains on sale and discontinued operations (in dollars per share)	(0.40)	0.51	(0.10)	0.92
Purchase price fair value adjustment (in usd per share)	0	0.72	0	0.72
Equity in net gain on sale of interest in unconsolidated joint venture/real estate (usd per share)	0.01	0.02	0.01	1.07
Net income from discontinued operations (in dollars per share)	0	0.06	0	0.12
Gain on sale of discontinued operations (usd per share)	0	1.15	0.13	1.16
Net income attributable to SLGOP common unitholders (in dollars per share)	(0.39)	2.46	0.04	3.99
Dividends per share/unit (in usd per share)	$ 0.60	$ 0.50	$ 1.2	$ 1
Basic weighted average common units outstanding (in shares)	103,487	98,970	102,930	98,627
Diluted weighted average common units and common unit equivalents outstanding (in shares)	103,487	99,484	103,423	99,128

Consolidated Statements of Ope5

Consolidated Statements of Operations (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Operating expenses, paid to related parties	$ 4,472	$ 4,567	$ 8,189	$ 8,080
SL Green Operating Partnership
Operating expenses, paid to related parties	$ 4,472	$ 4,567	$ 8,189	$ 8,080

Consolidated Statements of Comp

Consolidated Statements of Comprehensive (Loss) Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Net (loss) income	$ (29,179)	$ 250,332	$ 26,457	$ 406,943
Other comprehensive income (loss):
Change in net unrealized (loss) gain on derivative instruments, including SL Green's/SLGOP's share of joint venture net unrealized (loss) gain on derivative instruments	2,250	7,293	(3,430)	7,461
Change in unrealized gain on marketable securities	(1,304)	1,659	(654)	1,788
Other comprehensive income (loss)	946	8,952	(4,084)	9,249
Comprehensive (loss) income	(28,233)	259,284	22,373	416,192
Net loss attributable to noncontrolling interests and preferred units distributions	(6,189)	(11,053)	(14,810)	(17,837)
Other comprehensive (loss) income attributable to noncontrolling interests	(42)	(276)	158	(234)
Comprehensive (loss) income attributable to SL Green	(34,464)	247,955	7,721	398,121
SL Green Operating Partnership
Net (loss) income	(29,179)	250,332	26,457	406,943
Other comprehensive income (loss):
Change in net unrealized (loss) gain on derivative instruments, including SL Green's/SLGOP's share of joint venture net unrealized (loss) gain on derivative instruments	2,250	7,293	(3,430)	7,461
Change in unrealized gain on marketable securities	(1,304)	1,659	(654)	1,788
Other comprehensive income (loss)	946	8,952	(4,084)	9,249
Comprehensive (loss) income	(28,233)	259,284	22,373	416,192
Net loss attributable to noncontrolling interests and preferred units distributions	(6,626)	(1,843)	(12,553)	(3,333)
Comprehensive (loss) income attributable to SL Green	$ (34,859)	$ 257,441	$ 9,820	$ 412,859

Consolidated Statement of Equit

Consolidated Statement of Equity - 6 months ended Jun. 30, 2015 - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid- In-Capital	Treasury Stock	Accumulated Other Comprehensive Loss	Retained Earnings	Noncontrolling Interests	Series I Preferred StockPreferred Stock
Beginning Balance at Dec. 31, 2014	$ 7,459,216	$ 1,010	$ 5,289,479	$ (320,471)	$ (6,980)	$ 1,752,404	$ 521,842	$ 221,932
Beginning Balance (in shares) at Dec. 31, 2014		97,325
Increase (Decrease) in Stockholders' Equity
Net income	24,200					11,647	12,553
Acquisition of subsidiary interest from noncontrolling interest	(20,650)		(9,566)				(11,084)
Other comprehensive loss	(3,926)				(3,926)
Preferred dividends	(7,476)					(7,476)
DRSPP proceeds (in shares)		775
DRSPP proceeds	99,505	$ 8	99,497
Conversion of units of the Operating Partnership to common stock (in shares)		321
Conversion of units of the Operating Partnership to common stock	37,992	$ 3	37,989
Reallocation of noncontrolling interest in the Operating Partnership	20,670					20,670
Reallocation of capital account relating to sale	(10,144)						(10,144)
Deferred compensation plan and stock award, net (in shares)		27
Deferred compensation plan and stock award, net	(3,098)		1,638	(4,736)
Amortization of deferred compensation plan	14,920		14,920
Issuance of common stock (in shares)		987
Issuance of common stock	124,999	$ 10	124,989
Proceeds from stock options exercised (in shares)		155
Proceeds from stock options exercised	11,802	$ 2	11,800
Contributions to consolidated joint venture interests	8,655						8,655
Cash distributions to noncontrolling interests	(112,948)						(112,948)
Cash distributions declared ($1.20 per common share, none of which represented a return of capital for federal income tax purposes)	(119,334)					(119,334)
Ending Balance at Jun. 30, 2015	$ 7,524,383	$ 1,033	$ 5,570,746	$ (325,207)	$ (10,906)	$ 1,657,911	$ 408,874	$ 221,932
Ending Balance (in shares) at Jun. 30, 2015		99,590

Consolidated Statement of Equi8

Consolidated Statement of Equity (Parenthetical) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Statement of Stockholders' Equity [Abstract]
Cash distribution declared, per common share (in dollars per share)	$ 0.60	$ 0.50	$ 1.2	$ 1

Consolidated Statement of Capit

Consolidated Statement of Capital Statement - USD ($) shares in Thousands, $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2015
Increase (Decrease) in Partner's Capital
Acquisition of subsidiary interest from noncontrolling interest		$ (20,650)
Other comprehensive loss	$ 946	(4,084)
Issuance of common units		25,241
DRSPP proceeds		99,505
Conversion of units of the Operating Partnership to common stock		37,992
Reallocation of capital account relating to sale		(10,144)
Deferred compensation plan and stock award, net		(3,098)
Amortization of deferred compensation plan		14,920
Cash distributions to noncontrolling interests		$ (112,948)
Common Stock
Increase (Decrease) in Partner's Capital
DRSPP proceeds (in units)		775
DRSPP proceeds		$ 8
Conversion of units of the Operating Partnership to common stock (in units)		321
Conversion of units of the Operating Partnership to common stock		$ 3
Noncontrolling Interests
Increase (Decrease) in Partner's Capital
Acquisition of subsidiary interest from noncontrolling interest		(11,084)
Reallocation of capital account relating to sale		(10,144)
Cash distributions to noncontrolling interests		(112,948)
SL Green Operating Partnership
Increase (Decrease) in Partner's Capital
Beginning Balance		7,928,740
Net income		24,366
Acquisition of subsidiary interest from noncontrolling interest		(20,650)
Other comprehensive loss	946	(4,084)
Preferred distributions		(7,476)
Issuance of common units		25,241
DRSPP proceeds		99,505
Conversion of units of the Operating Partnership to common stock		0
Reallocation of capital account relating to sale		(10,144)
Deferred compensation plan and stock award, net		(3,098)
Amortization of deferred compensation plan		14,920
Contribution to consolidated joint venture interest		8,655
Contributions - net proceeds from common stock offering		124,999
Contributions - proceeds from stock options exercised		11,802
Cash distributions to noncontrolling interests		(112,948)
Cash distributions declared ($1.20 per common unit, none of which represented a return of capital for federal income tax purposes)		(124,027)
Ending Balance	7,955,801	7,955,801
SL Green Operating Partnership | Series I Preferred Stock
Increase (Decrease) in Partner's Capital
Beginning Balance		221,932
Net income		7,476
Preferred distributions		(7,476)
Ending Balance	221,932	221,932
SL Green Operating Partnership | Common Stock | General Partner
Increase (Decrease) in Partner's Capital
Beginning Balance		$ 7,078,924
Beginning Balance (units)		97,325
Net income		$ 4,171
Acquisition of subsidiary interest from noncontrolling interest		$ (9,566)
DRSPP proceeds (in units)		775
DRSPP proceeds		$ 99,505
Conversion of units of the Operating Partnership to common stock (in units)		321
Conversion of units of the Operating Partnership to common stock		$ 37,992
Deferred compensation plan and stock award, net (units)		27
Deferred compensation plan and stock award, net		$ (3,098)
Amortization of deferred compensation plan		$ 14,920
Contributions - net proceeds from common stock offering (in units)		987
Contributions - net proceeds from common stock offering		$ 124,999
Contributions - proceeds from stock options exercised (in units)		155
Contributions - proceeds from stock options exercised		$ 11,802
Cash distributions declared ($1.20 per common unit, none of which represented a return of capital for federal income tax purposes)		(119,334)
Ending Balance	$ 7,240,315	$ 7,240,315
Ending Balance (units)	99,590	99,590
SL Green Operating Partnership | Common Stock | Limited Partners
Increase (Decrease) in Partner's Capital
Beginning Balance		$ 113,298
Beginning Balance (units)		3,973
Net income		$ 166
Issuance of common units (in units)		255
Issuance of common units		$ 25,241
Conversion of units of the Operating Partnership to common stock (in units)		321
Conversion of units of the Operating Partnership to common stock		$ (37,992)
Cash distributions declared ($1.20 per common unit, none of which represented a return of capital for federal income tax purposes)		(4,693)
Ending Balance	$ 96,020	$ 96,020
Ending Balance (units)	3,907	3,907
SL Green Operating Partnership | Accumulated Other Comprehensive Loss
Increase (Decrease) in Partner's Capital
Beginning Balance		$ (7,256)
Other comprehensive loss		(4,084)
Ending Balance	$ (11,340)	(11,340)
SL Green Operating Partnership | Noncontrolling Interests
Increase (Decrease) in Partner's Capital
Beginning Balance		521,842
Net income		12,553
Acquisition of subsidiary interest from noncontrolling interest		(11,084)
Reallocation of capital account relating to sale		(10,144)
Contribution to consolidated joint venture interest		8,655
Cash distributions to noncontrolling interests		(112,948)
Ending Balance	$ 408,874	$ 408,874

Consolidated Statement of Cap10

Consolidated Statement of Capital (Parenthetical) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Cash distribution declared, per common share (in dollars per share)	$ 0.60	$ 0.50	$ 1.2	$ 1
SL Green Operating Partnership
Cash distribution declared, per common share (in dollars per share)	$ 0.60	$ 0.50	$ 1.2	$ 1

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Operating Activities
Net (loss) income	$ 26,457	$ 406,943
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	320,472	194,029
Equity in net income from unconsolidated joint ventures	(7,024)	(14,748)
Distributions of cumulative earnings from unconsolidated joint ventures	22,464	14,645
Equity in net gain on sale of interest in unconsolidated joint venture interest/real estate	(769)	(106,084)
Purchase price fair value adjustment	0	(71,446)
Gain on sale of discontinued operations	(12,983)	(114,735)
Loss on early extinguishment of debt	49	1,025
Deferred rents receivable	(65,260)	(26,727)
Other non-cash adjustments	(3,592)	(16,905)
Changes in operating assets and liabilities:
Restricted cash—operations	(1,246)	(4,850)
Tenant and other receivables	(6,826)	5,890
Related party receivables	340	(853)
Deferred lease costs	(35,918)	(10,688)
Other assets	11,410	5,305
Accounts payable, accrued expenses and other liabilities and security deposits	(16,987)	12,973
Deferred revenue and land leases payable	2,872	2,788
Net cash provided by operating activities	233,459	276,562
Investing Activities
Acquisitions of real estate property	(42,556)	(208,614)
Additions to land, buildings and improvements	(122,520)	(134,249)
Escrowed cash—capital improvements/acquisition deposits	(229,853)	(38,227)
Investments in unconsolidated joint ventures	(109,135)	(170,532)
Distributions in excess of cumulative earnings from unconsolidated joint ventures	49,059	157,699
Proceeds from disposition of real estate/joint venture interest	491,598	258,076
Proceeds from sale of marketable securities	295	3,555
Purchases of marketable securities	(7,769)	(10,025)
Other investments	(9,620)	20,594
Origination of debt and preferred equity investments	(387,216)	(256,730)
Repayments or redemption of debt and preferred equity investments	109,784	60,412
Net cash used in investing activities	(257,933)	(318,041)
Financing Activities
Proceeds from mortgages and other loans payable	106,421	1,601,603
Repayments of mortgages and other loans payable	(489,138)	(1,496,224)
Proceeds from revolving credit facility and senior unsecured notes	1,055,000	683,000
Repayments of revolving credit facility and senior unsecured notes	(735,007)	(520,690)
Proceeds from stock options exercised and DRSSP issuance	111,307	19,777
Proceeds from sale of common stock	124,999	8,750
Redemption of preferred unit	(200)	0
Distributions to noncontrolling interests in other partnerships	(111,715)	(4,352)
Contributions from noncontrolling interests in other partnerships	8,655	1,548
Distributions to noncontrolling interests in the Operating Partnership	(4,693)	(3,598)
Dividends/Distributions paid on common and preferred stock/units	(127,310)	(102,943)
Other obligations related to mortgage loan participations	25,000	0
Deferred loan costs and capitalized lease obligation	(4,358)	(43,981)
Net cash (used in) provided by financing activities	(41,039)	142,890
Net (decrease) increase in cash and cash equivalents	(65,513)	101,411
Cash and cash equivalents at beginning of year	281,409	206,692
Cash and cash equivalents at end of period	215,896	308,103
Supplemental Disclosure of Non-Cash Investing and Financing Activities:
Issuance of common stock as deferred compensation	1,638	1,406
Issuance of units in the Operating Partnership	25,241	19,460
Redemption of units in the Operating Partnership	37,992	23,066
Derivative instruments at fair value	2,000	17,088
Exchange of debt investment for equity in joint venture	10,151	0
Transfer of restricted cash to operating cash and cash equivalents as a result of sale	21,578	0
Acquisition of subsidiary interest from noncontrolling interest	20,630	0
Tenant improvements and capital expenditures payable	17,661	7,192
Fair value adjustment to noncontrolling interest in the Operating Partnership	20,670	107,925
Transfer to net assets held for sale	420,569	339,809
Transfer to liabilities related to net assets held for sale	178,252	193,375
Transfer of financing receivable to debt investment	0	19,675
Deferred leasing payable	5,525	659
Consolidation of real estate	0	1,316,591
Issuance of preferred units	53,808	4,000
SL Green Operating Partnership
Operating Activities
Net (loss) income	26,457	406,943
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	320,472	194,029
Equity in net income from unconsolidated joint ventures	(7,024)	(14,748)
Distributions of cumulative earnings from unconsolidated joint ventures	22,464	14,645
Equity in net gain on sale of interest in unconsolidated joint venture interest/real estate	(769)	(106,084)
Purchase price fair value adjustment	0	(71,446)
Gain on sale of discontinued operations	(12,983)	(114,735)
Loss on early extinguishment of debt	49	1,025
Deferred rents receivable	(65,260)	(26,727)
Other non-cash adjustments	(3,592)	(16,905)
Changes in operating assets and liabilities:
Restricted cash—operations	(1,246)	(4,850)
Tenant and other receivables	(6,826)	5,890
Related party receivables	340	(853)
Deferred lease costs	(35,918)	(10,688)
Other assets	11,410	5,305
Accounts payable, accrued expenses and other liabilities and security deposits	(16,987)	12,973
Deferred revenue and land leases payable	2,872	2,788
Net cash provided by operating activities	233,459	276,562
Investing Activities
Acquisitions of real estate property	(42,556)	(208,614)
Additions to land, buildings and improvements	(122,520)	(134,249)
Escrowed cash—capital improvements/acquisition deposits	(229,853)	(38,227)
Investments in unconsolidated joint ventures	(109,135)	(170,532)
Distributions in excess of cumulative earnings from unconsolidated joint ventures	49,059	157,699
Proceeds from disposition of real estate/joint venture interest	491,598	258,076
Proceeds from sale of marketable securities	295	3,555
Purchases of marketable securities	(7,769)	(10,025)
Other investments	(9,620)	20,594
Origination of debt and preferred equity investments	(387,216)	(256,730)
Repayments or redemption of debt and preferred equity investments	109,784	60,412
Net cash used in investing activities	(257,933)	(318,041)
Financing Activities
Proceeds from mortgages and other loans payable	106,421	1,601,603
Repayments of mortgages and other loans payable	(489,138)	(1,496,224)
Proceeds from revolving credit facility and senior unsecured notes	1,055,000	683,000
Repayments of revolving credit facility and senior unsecured notes	(735,007)	(520,690)
Proceeds from stock options exercised and DRSSP issuance	111,307	19,777
Proceeds from sale of common stock	124,999	8,750
Redemption of preferred unit	(200)	0
Distributions to noncontrolling interests in other partnerships	(111,715)	(4,352)
Contributions from noncontrolling interests in other partnerships	8,655	1,548
Dividends/Distributions paid on common and preferred stock/units	(132,003)	(106,541)
Other obligations related to mortgage loan participations	25,000	0
Deferred loan costs and capitalized lease obligation	(4,358)	(43,981)
Net cash (used in) provided by financing activities	(41,039)	142,890
Net (decrease) increase in cash and cash equivalents	(65,513)	101,411
Cash and cash equivalents at beginning of year	281,409	206,692
Cash and cash equivalents at end of period	215,896	308,103
Supplemental Disclosure of Non-Cash Investing and Financing Activities:
Issuance of common stock as deferred compensation	1,638	1,406
Issuance of units in the Operating Partnership	25,241	19,460
Redemption of units in the Operating Partnership	37,992	23,066
Derivative instruments at fair value	2,000	17,088
Exchange of debt investment for equity in joint venture	10,151	0
Transfer of restricted cash to operating cash and cash equivalents as a result of sale	21,578	0
Acquisition of subsidiary interest from noncontrolling interest	20,630	0
Tenant improvements and capital expenditures payable	17,661	7,192
Transfer to net assets held for sale	420,569	339,809
Transfer to liabilities related to net assets held for sale	178,252	193,375
Transfer of financing receivable to debt investment	0	19,675
Deferred leasing payable	5,525	659
Consolidation of real estate	0	1,316,591
Issuance of preferred units	$ 53,808	$ 4,000

Organization and Basis of Prese

Organization and Basis of Presentation	6 Months Ended
	Jun. 30, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Basis of Presentation	Organization and Basis of Presentation SL Green Realty Corp., which is referred to as the Company or SL Green, a Maryland corporation, and SL Green Operating Partnership, L.P., which is referred to as SLGOP or the Operating Partnership, a Delaware limited partnership, were formed in June 1997 for the purpose of combining the commercial real estate business of S.L. Green Properties, Inc. and its affiliated partnerships and entities. The Operating Partnership received a contribution of interest in the real estate properties, as well as 95% of the economic interest in the management, leasing and construction companies which are referred to as the Service Corporation, a consolidated variable interest entity. All of the management, leasing and construction services that are provided to the properties that are wholly-owned by us and that are provided to certain joint ventures are conducted through SL Green Management LLC which is 100% owned by the Operating Partnership. The Company has qualified, and expects to qualify in the current fiscal year, as a real estate investment trust, or REIT, under the Internal Revenue Code of 1986, as amended, or the Code, and operates as a self-administered, self-managed REIT. A REIT is a legal entity that holds real estate interests and, through payments of dividends to stockholders, is permitted to minimize the payment of Federal income taxes at the corporate level. Unless the context requires otherwise, all references to "we," "our" and "us" means the Company and all entities owned or controlled by the Company, including the Operating Partnership. Substantially all of our assets are held by, and all of our operations are conducted through the Operating Partnership. The Company is the sole managing general partner of the Operating Partnership. As of June 30, 2015 , noncontrolling investors held, in the aggregate, a 3.78% limited partnership interest in the Operating Partnership. We refer to these interests as the noncontrolling interests in the Operating Partnership. See Note 11, "Noncontrolling Interests on the Company's Consolidated Financial Statements." Reckson Associates Realty Corp., or Reckson, and Reckson Operating Partnership, L.P., or ROP, are wholly-owned subsidiaries of the Operating Partnership. As of June 30, 2015 , we owned the following interests in commercial and residential properties in the New York Metropolitan area, primarily in midtown Manhattan. Our investments in the New York Metropolitan area also include investments in Brooklyn, Long Island, Westchester County, Connecticut and New Jersey, which are collectively known as the Suburban properties: Consolidated Unconsolidated Total Location Type Number of Properties Approximate Square Feet Number of Properties Approximate Square Feet Number of Properties Approximate Square Feet Weighted Average Occupancy (1) Commercial: Manhattan Office (2) 24 18,533,045 7 3,476,115 31 22,009,160 96.9 % Retail (2) 9 (3) 403,735 7 279,628 16 683,363 91.9 % Development/Redevelopment 7 779,862 5 1,952,782 12 2,732,644 36.9 % Fee Interest 2 783,530 — — 2 783,530 100.0 % 42 20,500,172 19 5,708,525 61 26,208,697 90.6 % Suburban Office 28 4,450,400 5 1,287,741 33 5,738,141 81.9 % Retail 1 52,000 — — 1 52,000 100.0 % Development/Redevelopment 1 1,000 1 — 2 1,000 100.0 % 30 4,503,400 6 1,287,741 36 5,791,141 82.1 % Total commercial properties 72 25,003,572 25 6,996,266 97 31,999,838 89.1 % Residential: Manhattan Residential 4 (3) 762,587 17 2,046,733 21 2,809,320 96.4 % Suburban Residential 1 66,611 — — 1 66,611 92.0 % Total residential properties 5 829,198 17 2,046,733 22 2,875,931 96.3 % Total portfolio 77 25,832,770 42 9,042,999 119 34,875,769 89.7 % ____________________________________________________________________ (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) Includes one office and two retail properties held for sale as of June 30, 2015. (3) As of June 30, 2015 , we owned a building that was comprised of approximately 270,132 square feet of retail space and approximately 222,855 square feet 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. As of June 30, 2015 , we also managed an approximately 336,201 square foot office building owned by a third party and held debt and preferred equity investments with a book value of $1.7 billion . Partnership Agreement In accordance with the partnership agreement of the Operating Partnership, or the Operating Partnership Agreement, we allocate all distributions and profits and losses in proportion to the percentage of ownership interests of the respective partners. As the managing general partner of the Operating Partnership, we are required to take such reasonable efforts, as determined by us in our sole discretion, to cause the Operating Partnership to distribute sufficient amounts to enable the payment of sufficient dividends by us to minimize any Federal income or excise tax at the Company level. Under the Operating Partnership Agreement, each limited partner has the right to redeem units of limited partnership interests for cash, or if we so elect, shares of SL Green's common stock on a one-for- one basis. Basis of Quarterly Presentation The accompanying unaudited consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and notes required by accounting principles generally accepted in the United States for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for the fair presentation of the financial position of the Company and the Operating Partnership at June 30, 2015 and the results of operations for the periods presented have been included. The operating results for the period presented are not necessarily indicative of the results that may be expected for the year ending December 31, 2015 . These financial statements should be read in conjunction with the financial statements and accompanying notes included in the Annual Report on Form 10-K for the year ended December 31, 2014 of the Company and the Operating Partnership. The consolidated balance sheets at December 31, 2014 have been derived from the audited financial statements as of that date but do not include all the information and footnotes required by accounting principles generally accepted in the United States for complete financial statements.

Significant Accounting Policies

Significant Accounting Policies	6 Months Ended
	Jun. 30, 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 debt and preferred equity investments. See Note 5, "Debt and Preferred Equity Investments" and Note 6, "Investments in Unconsolidated Joint Ventures." All significant intercompany balances and transactions have been eliminated. We consolidate a variable interest entity, or VIE, in which we are considered the primary beneficiary. The primary beneficiary is the entity that has (i) the power to direct the activities that most significantly impact the entity's economic performance and (ii) the obligation to absorb losses of the VIE or the right to receive benefits from the VIE that could be significant to the VIE. Included in commercial real estate properties on our consolidated balance sheets as of June 30, 2015 and December 31, 2014 are $199.6 million and $198.4 million , respectively, related to our consolidated VIEs. Included in mortgages and other loans payable on our consolidated balance sheets as of June 30, 2015 and December 31, 2014 are $105.5 million and $106.5 million , respectively, related to our consolidated VIEs. Also, included in assets held for sale and liabilities related to assets held for sale on our consolidated balance sheets as of December 31, 2014 are $445.0 million of commercial real estate and $253.9 million of mortgage related to our consolidated VIEs. A noncontrolling interest in a consolidated subsidiary is defined as the portion of the equity (net assets) in a subsidiary not attributable, directly or indirectly, to us. Noncontrolling interests are required to be presented as a separate component of equity in the consolidated balance sheet and the presentation of net income is modified to present earnings and other comprehensive income attributed to controlling and noncontrolling interests. We assess the accounting treatment for each joint venture and debt and preferred equity investment. This assessment includes a review of each joint venture or limited liability company agreement to determine which party has what rights and whether those rights are protective or participating. For all VIEs, we review such agreements in order to determine which party has the power to direct the activities that most significantly impact the entity's economic performance. In situations where we and our partner approve, among other things, the annual budget, receive a detailed monthly reporting package from us, 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 the requirement of partner approval to sell, finance or refinance the property and the payment of capital expenditures and operating expenditures outside of the approved budget or operating plan. Investment in Commercial Real Estate Properties 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 do not believe that the values of any of our consolidated properties were other than temporarily impaired at June 30, 2015 . 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 their carrying value or fair value less costs to sell. We allocate the purchase price of real estate to land and building (inclusive of tenant improvements) and, if determined to be material, intangibles, such as the value of above- and below-market leases and origination costs associated with the in-place leases. We depreciate the amount allocated to building (inclusive of tenant improvements) over their estimated useful lives, which generally range from three to 40 years . We amortize the amount allocated to the above- and below-market leases over the remaining term of the associated lease, which generally range from one to 14 years, and record it as either an increase (in the case of below-market leases) or a decrease (in the case of above-market leases) to rental income. We amortize the amount allocated to the values associated with in-place leases over the expected term of the associated lease, which generally ranges from one to 14 years. If a tenant vacates its space prior to the contractual termination of the lease and no rental payments are being made on the lease, any unamortized balance of the related intangible will be written off. The tenant improvements and origination costs are amortized as an expense over the remaining life of the lease (or charged against earnings if the lease is terminated prior to its contractual expiration date). We assess fair value of the leases based on estimated cash flow projections that utilize appropriate discount and capitalization rates and available market information. Estimates of future cash flows are based on a number of factors including the historical operating results, known trends, and market/economic conditions that may affect the property. To the extent acquired leases contain fixed rate renewal options that are below-market and determined to be material, we amortize such below-market lease value into rental income over the renewal period. We recognized an increase of $8.3 million , $22.6 million , $6.4 million and $12.5 million in rental revenue for the three and six months ended June 30, 2015 and 2014, respectively, for the amortization of aggregate below-market leases in excess of above-market leases and a reduction in lease origination costs, resulting from the allocation of the purchase price of the applicable properties. We recognized a reduction in interest expense for the amortization of the above-market rate mortgages assumed of $0.6 million , $1.2 million , $1.3 million and $2.8 million for the three and six months ended June 30, 2015 and 2014, respectively. The following summarizes our identified intangible assets (acquired above-market leases and in-place leases) and intangible liabilities (acquired below-market leases) as of June 30, 2015 and December 31, 2014 (in thousands): June 30, 2015 December 31, 2014 Identified intangible assets (included in other assets): Gross amount $ 941,064 $ 664,297 Accumulated amortization (399,103 ) (383,236 ) Net (1) $ 541,961 $ 281,061 Identified intangible liabilities (included in deferred revenue): Gross amount $ 804,550 $ 655,755 Accumulated amortization (484,673 ) (483,948 ) Net (1) $ 319,877 $ 171,807 ____________________________________________________________________ (1) As of June 30, 2015, $3.6 million and $8.3 million of net intangible assets and net intangible liabilities, respectively, were reclassed to assets held for sale and liabilities related to assets held for sale. Fair Value Measurements See Note 17, "Fair Value Measurements." Investment in Marketable Securities We designate a security as held-to-maturity, available-for-sale, or trading at acquisition. As of June 30, 2015 , we do not have any securities designated as held-to-maturity or trading. We account for our available-for-sale securities at fair value pursuant to ASC 820-10, with the net unrealized gains or losses reported as a component of accumulated other comprehensive income or loss. Any unrealized losses that are determined to be other-than-temporary are recognized in earnings up to their credit component. The cost of bonds and marketable securities sold is determined using the specific identification method. At June 30, 2015 and December 31, 2014, we held the following marketable securities (in thousands): June 30, 2015 December 31, 2014 Equity marketable securities $ 4,070 $ 4,332 Mortgage-backed securities 42,181 35,097 Total marketable securities available-for-sale $ 46,251 $ 39,429 The cost basis of the commercial mortgage-backed securities was $39.9 million and $32.4 million at June 30, 2015 and December 31, 2014, respectively. These securities mature at various times through 2049. During the six months ended June 30, 2015 and 2014, we disposed of marketable securities for aggregate net proceeds of $0.3 million and $3.6 million , respectively. Investments in Unconsolidated Joint Ventures We assess our investments in unconsolidated joint ventures for recoverability, and if it is determined that a loss in value of the investment is other than temporary, we write down the investment to its fair value. We evaluate our equity investments for impairment based on the joint venture's projected discounted cash flows. We do not believe that the values of any of our equity investments were impaired at June 30, 2015 . We may originate loans for real estate acquisition, development and construction, where we expect to receive some or all of the residual profit from such projects. When the risk and rewards of these arrangements are essentially the same as an investor or joint venture partner, we account for these arrangements as real estate investments under the equity method of accounting for investments. Otherwise, we account for these arrangements consistent with our loan accounting for our debt and preferred equity investments. Revenue Recognition Rental revenue is recognized on a straight-line basis over the term of the lease. Rental revenue recognition commences when the tenant takes possession or controls the physical use of the leased space. In order for the tenant to take possession, the leased space must be substantially ready for its intended use. To determine whether the leased space is substantially ready for its intended use, management evaluates whether we are or the tenant is the owner of tenant improvements for accounting purposes. When management concludes that we are the owner of tenant improvements, rental revenue recognition begins when the tenant takes possession of the finished space, which is when such tenant improvements are substantially complete. In certain instances, when management concludes that we are not the owner (the tenant is the owner) of tenant improvements, rental revenue recognition begins when the tenant takes possession of or controls the space. When management concludes that we are the owner of tenant improvements for accounting purposes, we record amounts funded to construct the tenant improvements as a capital asset. For these tenant improvements, we record amounts reimbursed by tenants as a reduction of the capital asset. When management concludes that the tenant is the owner of tenant improvements for accounting purposes, we record our contribution towards those improvements as a lease incentive, which is included in deferred costs, net on our consolidated balance sheets and amortized as a reduction to rental revenue on a straight-line basis over the term of the lease. The excess of rents recognized over amounts contractually due pursuant to the underlying leases are included in deferred rents receivable on the consolidated balance sheets. We establish, on a current basis, an allowance for future potential tenant credit losses, which may occur against this account. The balance reflected on the consolidated balance sheets is net of such allowance. In addition to base rent, our tenants also generally will pay their pro rata share of increases in real estate taxes and operating expenses for the building over a base year. In some leases, in lieu of paying additional rent based upon increases in building operating expenses, the tenant will pay additional rent based upon increases in the wage rate paid to porters over the porters' wage rate in effect during a base year or increases in the consumer price index over the index value in effect during a base year. In addition, many of our leases contain fixed percentage increases over the base rent to cover escalations. Electricity is most often supplied by the landlord either on a sub-metered basis, or rent inclusion basis (i.e., a fixed fee is included in the rent for electricity, which amount may increase based upon increases in electricity rates or increases in electrical usage by the tenant). Base building services other than electricity (such as heat, air conditioning and freight elevator service during business hours, and base building cleaning) are typically provided at no additional cost, with the tenant paying additional rent only for services which exceed base building services or for services which are provided outside normal business hours. These escalations are based on actual expenses incurred in the prior calendar year. If the expenses in the current year are different from those in the prior year, then during the current year, the escalations will be adjusted to reflect the actual expenses for the current year. We record a gain on sale of real estate when title is conveyed to the buyer, subject to the buyer's financial commitment being sufficient to provide economic substance to the sale and 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. Several of the debt and preferred equity investments provide for accrual of interest at specified rates, which differ from current payment terms. Interest is recognized on such loans at the accrual rate subject to management's determination that accrued interest 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 a reduction 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 these loans individually. When a transaction meets the criteria of sale accounting, we derecognize the loan sold and recognize gain or loss based on the difference between the sales price and the carrying value of the loan sold. Any related unamortized deferred origination fees, original issue discounts, loan origination costs, discounts or premiums at the time of sale are recognized as an adjustment to the gain or loss on sale, which is included in investment income on the consolidated statement of income. Any fees received at the time of sale or syndication are recognized as part of investment income. Asset management fees are recognized on a straight-line basis over the term of the asset management agreement. Reserve for Possible Credit Losses The expense for possible credit losses in connection with debt and preferred equity investments is the charge to earnings to increase the allowance for possible credit losses to the level that we estimate to be adequate, based on Level 3 data, considering delinquencies, loss experience and collateral quality. Other factors considered relate to geographic trends and product diversification, the size of the portfolio and current economic conditions. Based upon these factors, we establish the provision for possible credit losses 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 the additional information obtained reflects increased recovery of our investment, we will adjust our reserves accordingly. There were no loan reserves recorded during three and six months ended June 30, 2015 and 2014 . Debt and preferred equity investments held for sale are carried at the lower of cost or fair market value using available market information obtained through consultation with dealers or other originators of such investments as well as discounted cash flow models based on Level 3 data pursuant to ASC 820-10. As circumstances change, management may conclude not to sell an investment designated as held for sale. In such situations, the investment will be reclassified at its net carrying value to debt and preferred equity investments held to maturity. For these reclassified investments, the difference between the current carrying value and the expected cash to be collected at maturity will be accreted into income over the remaining term of the investment. Income Taxes SL Green is taxed as a REIT under Section 856(c) of the Code. As a REIT, SL Green generally is not subject to Federal income tax. To maintain its qualification as a REIT, SL Green must distribute at least 90% of its REIT taxable income to its stockholders and meet certain other requirements. If SL Green fails to qualify as a REIT in any taxable year, we will be subject to Federal income tax on SL Green's taxable income at regular corporate rates. SL Green may also be subject to certain state, local and franchise taxes. Under certain circumstances, Federal income and excise taxes may be due on SL Green's undistributed taxable income. The Operating Partnership is a partnership and, as a result, all income and losses of the partnership are allocated to the partners for inclusion in their respective income tax returns. The only provision for income taxes included in the consolidated statements of operations relates to the Operating Partnership’s consolidated taxable REIT subsidiaries. The Operating Partnership may also be subject to certain state, local and franchise taxes. Pursuant to amendments to the Code that became effective January 1, 2001, we have elected, and may elect in the future, to treat certain of our existing or newly created corporate subsidiaries as taxable REIT subsidiaries, or TRSs. In general, TRSs may perform non-customary services for the tenants of the Company, hold assets that we cannot hold directly and generally may engage in any real estate or non-real estate related business. The TRSs generate income, resulting in Federal and state income tax liability for these entities. During the three and six months ended June 30, 2015 and 2014 , we recorded Federal, state and local tax provisions of $1.1 million , $1.4 million , $2.1 million and $5.0 million , respectively. We follow a two-step approach for evaluating uncertain tax positions. Recognition (step one) occurs when an enterprise concludes that a tax position, based solely on its technical merits, is more-likely-than-not to be sustained upon examination. Measurement (step two) determines the amount of benefit that is more-likely-than-not to be realized upon settlement. Derecognition of a tax position that was previously recognized would occur when a company subsequently determines that a tax position no longer meets the more-likely-than-not threshold of being sustained. The use of a valuation allowance as a substitute for derecognition of tax positions is prohibited. Stock-Based Employee Compensation Plans We have a stock-based employee compensation plan, described more fully in Note 14, "Share-based Compensation." The Company's stock options are recorded at fair value at the time of issuance. Fair value of the stock options is determined using the Black-Scholes option pricing model. The Black-Scholes model was developed for use in estimating the fair value of traded options, which have no vesting restrictions and are fully transferable. In addition, option valuation models require the input of highly subjective assumptions including the expected stock price volatility. Because our plan has characteristics significantly different from those of traded options and because changes in the subjective input assumptions can materially affect the fair value estimate, in our opinion, the existing models do not necessarily provide a reliable single measure of the fair value of the employee stock options. Compensation cost for stock options, if any, is recognized over the vesting period of the award. Our policy is to grant options with an exercise price equal to the quoted closing market price of the Company's common stock on the grant date. Awards of stock or restricted stock are expensed as compensation over the benefit period based on the fair value of the stock on the grant date. For share-based awards with a performance or market measure, we recognize compensation cost over the requisite service period, using the accelerated attribution expense method. The requisite service period begins on the date the compensation committee of SL Green's board of directors authorizes the award, adopts any relevant performance measures and communicates the award to the employees. For programs with awards that vest based on the achievement of a performance condition or market condition, we determine whether it is probable that the performance condition will be met, and estimate compensation cost based on the fair value of the award at the applicable reporting date estimated using a binomial model or market quotes. For share-based awards for which there is no pre-established performance measure, we recognize compensation cost over the service vesting period, which represents the requisite service period, on a straight-line basis. In accordance with the provisions of our share-based incentive compensation plans, we accept the return of shares of the Company's common stock, at the current quoted market price, from certain key employees to satisfy minimum statutory tax-withholding requirements related to shares that vested during the period. Awards can also be made in the form of a separate series of units of limited partnership interest in the Operating Partnership called long-term incentive plan units, or LTIP units. LTIP units, which can be granted either as free-standing awards or in tandem with other awards under our stock incentive plan, are valued by reference to the value of the Company's common stock at the time of grant, and are subject to such conditions and restrictions as the compensation committee of the Company's board of directors may determine, including continued employment or service, computation of financial metrics and/or achievement of pre-established performance goals and objectives. Earnings per Share of the Company The Company presents both basic and diluted earnings per share, or EPS. Basic EPS excludes dilution and is computed by dividing net income or loss attributable to common stockholders by the weighted average number of common shares outstanding during the period. Basic EPS includes participating securities, consisting of unvested restricted stock that receive nonforfeitable dividends similar to shares of common stock. Diluted EPS reflects the potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted into common stock, where such exercise or conversion would result in a lower EPS amount. Diluted EPS also includes units of limited partnership interest. The dilutive effect of stock options is reflected in the weighted average diluted outstanding shares calculation by application of the treasury stock method. There is no dilutive effect for the exchangeable senior notes as the conversion premium will be paid in cash. Earnings per Unit of the Operating Partnership The Operating Partnership presents both basic and diluted earnings per unit, or EPU. Basic EPU excludes dilution and is computed by dividing net income or loss attributable to common unitholders by the weighted average number of common units outstanding during the period. Basic EPU includes participating securities, consisting of unvested restricted units that receive nonforfeitable dividends similar to shares of common units. Diluted EPU reflects the potential dilution that could occur if securities or other contracts to issue common units were exercised or converted into common units, where such exercise or conversion would result in a lower EPU amount. The dilutive effect of unit options is reflected in the weighted average diluted outstanding units calculation by application of the treasury stock method. There is no dilutive effect for the exchangeable senior notes as the conversion premium will be paid in cash. Use of Estimates The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from those estimates. Concentrations of Credit Risk Financial instruments that potentially subject us to concentrations of credit risk consist primarily of cash investments, debt and preferred equity investments and accounts receivable. We place our cash investments in excess of insured amounts with high quality financial institutions. The collateral securing our debt and preferred equity investments is located in New York City. See Note 5, "Debt and Preferred Equity Investments." We perform ongoing credit evaluations of our tenants and require most tenants to provide security deposits or letters of credit. Though these security deposits and letters of credit are insufficient to meet the total value of a tenant's lease obligation, they are a measure of good faith and a source of funds to offset the economic costs associated with lost rent and the costs associated with re-tenanting a space. Although the properties in our real estate portfolio are primarily located in Manhattan, we also have properties located in Brooklyn, Long Island, Westchester County, Connecticut and New Jersey. The tenants located in our buildings operate in various industries. Other than three tenants who account for 10.5% , 6.5% and 5.3% of our share of annualized cash rent, respectively, no other tenant in our portfolio accounted for more than 2.0% of our share of annualized cash rent, including our share of joint venture annualized rent, at June 30, 2015 . For the three months ended June 30, 2015 , 10.1% , 9.5% , 7.8% and 7.5% of our annualized cash rent for consolidated properties was attributable to 1515 Broadway, 388-390 Greenwich Street, 919 Third Ave and1185 Avenue of the Americas, respectively. Reclassification Certain prior year balances have been reclassified to conform to our current year presentation primarily in order to eliminate discontinued operations from income from continuing operations. Accounting Standards Updates In April 2015, the Financial Accounting Standards Board, or 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 (Accounting Standards Update, or 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 expects to adopt the guidance effective January 1, 2016 and the guidance is not anticipated to 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 is currently evaluating the new guidance to determine the impact it may have 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 is 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 has adopted the standard beginning in the first quarter of 2015. The adoption of this guidance did not have a material impact on our consolidated financial statements. The Company has adopted the presentation and disclosures related to transactions accounted for as secured borrowings during the second quarter of 2015. 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 custo

Property Acquisitions

Property Acquisitions	6 Months Ended
	Jun. 30, 2015
Business Combinations [Abstract]
Property Acquisitions	Property Acquisitions 2015 Acquisitions During the six months ended June 30, 2015 , the properties listed below were acquired from third parties. The following summarizes our preliminary allocation of the purchase price of the assets acquired and liabilities assumed upon the closing of these acquisitions (in thousands): Upper East Side Residential (1)(2) 1640 Flatbush Avenue (1) Acquisition Date June 2015 March 2015 Ownership Type Fee Interest Fee Interest Property Type Residential/Retail Retail Purchase Price Allocation: Land $ 17,500 $ 6,120 Building and building leasehold 32,500 680 Above-market lease value — — Acquired in-place leases — — Other assets, net of other liabilities — — Assets acquired 50,000 6,800 Mark-to-market assumed debt — — Below-market lease value — — Derivatives — — Liabilities assumed — — Purchase price $ 50,000 $ 6,800 Net consideration funded by us at closing, excluding consideration financed by debt $ 50,000 $ 6,800 Equity and/or debt investment held $ — $ — Debt assumed $ — $ — ____________________________________________________________________ (1) We are currently in the process of analyzing the purchase price allocation and, as such, we have not allocated any value to intangible assets such as above- and below-market lease or in-place leases. (2) We, along with our joint venture partner, acquired this property for consideration that included the issuance of $13.8 million aggregate liquidation preference of Series N Preferred Units of limited partnership interest of the Operating Partnership and cash. We hold a 95.1% controlling interest in this joint venture. 2014 Acquisitions During the six months ended June 30, 2015 , we finalized the purchase price allocations 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 Street (1) 719 Seventh Avenue (1)(2) 115 Spring Street (1) 388-390 Greenwich Street (1)(3) Acquisition Date October 2014 July 2014 July 2014 May 2014 Ownership Type Fee Interest Fee Interest Fee Interest Fee Interest Property Type Retail Development Retail Office Purchase Price Allocation: Land $ 8,215 $ 41,850 $ 11,078 $ 516,292 Building and building leasehold 26,717 — 44,799 964,434 Above-market lease value — — — — Acquired in-place leases 1,015 — 2,037 302,430 Other assets, net of other liabilities 3 — — 6,495 Assets acquired 35,950 41,850 57,914 1,789,651 Mark-to-market assumed debt — — — — Below-market lease value 3,701 — 4,789 186,782 Derivatives — — — 18,001 Liabilities assumed 3,701 — 4,789 204,783 Purchase price $ 32,249 $ 41,850 $ 53,125 $ 1,584,868 Net consideration funded by us at closing, excluding consideration financed by debt $ 32,249 $ 41,850 $ 53,125 $ 208,614 Equity and/or debt investment held $ — $ — $ — $ 148,025 Debt assumed $ — $ — $ — $ 1,162,379 ____________________________________________________________________ (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, $14.4 million and $26.7 million to land and building, respectively, at 719 Seventh Avenue, $15.9 million and $37.2 million to land and building, respectively, at 115 Spring Street and $558.7 million and $1.0 billion to land and building, respectively, at 388-390 Greenwich. The impact to our consolidated statement of income for the six months ended June 30, 2015 was $6.8 million in rental revenue for the amortization of aggregate below-market leases and $10.1 million of depreciation expense. (2) We, along with our joint venture partner, acquired this property for consideration that included the issuance of $14.1 million aggregate liquidation preference of Series L Preferred Units of limited partnership interest of the Operating Partnership and $9.5 million aggregate liquidation preference of Series K Preferred Units of limited partnership interest of the Operating Partnership. We hold a 75.0% controlling interest in this joint venture. (3) In May 2014, we acquired Ivanhoe Cambridge, Inc.'s 49.65% economic interest in this property, thereby consolidating full ownership of the property. The transaction valued the consolidated interests at $1.585 billion . Simultaneous with the closing, we refinanced the previous mortgage with a $1.45 billion mortgage. We also assumed the existing derivative instruments, which swapped $504.0 million of the mortgage to fixed rate (in October 2014, we entered into multiple swap agreements to hedge our interest rate exposure on an additional $500.0 million portion of this mortgage. See Note 8, "Mortgages and Other Loans Payable" for further details). We recognized a purchase price fair value adjustment of $71.4 million upon closing of this transaction. This property, which we initially acquired in December 2007, was previously accounted for as an investment in unconsolidated joint ventures. For business combinations achieved in stages, the acquisition-date fair value of our equity interest in a property immediately before the acquisition date is determined based on estimated cash flow projections that utilize available market information and discount and capitalization rates that we deem appropriate. Estimates of future cash flows are based on a number of factors including historical operating results, known and anticipated trends, and market and economic conditions. The acquisition-date fair value of the equity interest in 388-390 Greenwich Street immediately before the acquisition date as well as the purchase price fair value, as determined in accordance with the methodology set out in the prior sentence, is as follows (in thousands): 388-390 Greenwich Street Contract purchase price $ 1,585,000 Net consideration funded by us at closing, excluding consideration financed by debt (208,614 ) Debt assumed (1,162,379 ) Fair value of retained equity interest 214,007 Equity and/or debt investment held (148,025 ) Other (1) 5,464 Purchase price fair value adjustment $ 71,446 ___________________________________________________________________ (1) Includes the acceleration of a deferred leasing commission from the joint venture to the Company.

Properties Held for Sale and Pr

Properties Held for Sale and Property Dispositions	6 Months Ended
	Jun. 30, 2015
Discontinued Operations and Disposal Groups [Abstract]
Properties Held for Sale and Property Dispositions	Properties Held for Sale and Property Disposition Properties Held for Sale During the second quarter of 2015, we entered into two separate agreements to sell the property located at 120 West 45th Street for $365.0 million and an 80% interest in 131-137 Spring Street based on a gross asset valuation of $277.8 million . In August, we closed on the sale of an interest in 131-137 Spring Street and expect to close on 120 West 45th Street in the second half of 2015, subject to customary closing conditions. Property Disposition The following table summarizes the property sold during the six months ended June 30, 2015 : Property Disposition Date Property Type Approximate Usable Square Feet Sales Price (in millions) Gain on Sale (1) (in millions) 180 Maiden Lane January 2015 Office 1,090,000 $ 470.0 $ 17.0 ____________________________________________________________________ (1) The gain on sale for 180 Maiden Lane is net of a $0.8 million employee compensation award accrued in connection with the realization of this investment gain as a bonus to certain employees that were instrumental in realizing the gain on sale. Additionally, amounts do not include adjustments for expense recorded in subsequent periods. Discontinued Operations The Company adopted ASU 2014-08 effective January 1, 2015. As a result, the Company classified 120 West 45th Street and 131-137 Spring Street as held for sale 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 180 Maiden Lane, which was held for sale at December 31, 2014 and sold in January 2015, and 2 Herald Square, 985-987 Third Avenue and 673 First Avenue, which were sold during 2014. The following table summarizes net income from discontinued operations for the three and six months ended June 30, 2015 and 2014 , respectively (in thousands): Three Months Ended June 30, Six Months Ended June 30, 2015 2014 2015 2014 Revenues Rental revenue $ — $ 13,993 $ 236 $ 35,172 Escalation and reimbursement revenues — 1,211 (127 ) 4,609 Other income — 17 — 20 Total revenues — 15,221 109 39,801 Operating expenses — 1,868 (631 ) 6,329 Real estate taxes — 1,846 250 5,831 Ground rent — 805 — 3,001 Transaction related costs — 40 (49 ) 40 Interest expense, net of interest income — 3,448 109 8,109 Amortization of deferred financing costs — 110 3 321 Depreciation and amortization — 1,459 — 4,756 Total expenses — 9,576 (318 ) 28,387 Net income from discontinued operations $ — $ 5,645 $ 427 $ 11,414

Debt and Preferred Equity Inves

Debt and Preferred Equity Investments	6 Months Ended
	Jun. 30, 2015
Investments, Debt and Equity Securities [Abstract]
Debt and Preferred Equity Investments	Debt and Preferred Equity Investments During the six months ended June 30, 2015 and 2014 , our debt and preferred equity investments, net of discounts and deferred origination fees, increased $386.2 million and $303.4 million , respectively, due to originations, purchases, advances under future funding obligations, discount amortization, and paid-in-kind interest, net of premium amortization. We recorded repayments, participations and sales of $109.8 million and $60.4 million during the six months ended June 30, 2015 and 2014 , respectively, which offset the increases in debt and preferred equity investments. Debt Investments As of June 30, 2015 and December 31, 2014, we held the following debt investments with an aggregate weighted average current yield of 10.15% at June 30, 2015 (in thousands): Loan Type June 30, 2015 Future Funding Obligations June 30, 2015 Senior Financing June 30, 2015 Carrying Value (1) December 31, 2014 Carrying Value (1) Initial Maturity Date Fixed Rate Investments: Jr. Mortgage Participation $ — $ 205,000 $ 71,909 $ 70,688 February 2016 Jr. Mortgage Participation/Mezzanine Loan (2)(3) — — 46,136 45,611 Various (2) Jr. Mortgage Participation — 133,000 49,000 49,000 June 2016 Mezzanine Loan — 165,000 71,962 71,656 November 2016 Jr. Mortgage Participation/Mezzanine Loan — 1,109,000 102,646 98,934 March 2017 Mezzanine Loan (3) — — 65,969 65,770 March 2017 Mezzanine Loan (4) 5,663 502,100 35,409 24,608 June 2017 Mezzanine Loan — 539,000 49,643 49,629 July 2018 Mortgage Loan (5) — — 26,235 26,209 February 2019 Mortgage Loan — — 576 637 August 2019 Loan Type June 30, 2015 Future Funding Obligations June 30, 2015 Senior Financing June 30, 2015 Carrying Value (1) December 31, 2014 Carrying Value (1) Initial Maturity Date Mezzanine Loan — 15,000 3,500 3,500 September 2021 Mezzanine Loan (6) — 90,000 19,933 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 Total fixed rate $ 5,663 $ 2,853,100 $ 572,918 $ 582,174 Floating Rate Investments: Mezzanine Loan — 110,000 49,882 49,614 September 2015 Mezzanine Loan — 775,000 74,014 73,402 March 2016 Mortgage/Mezzanine Loan 18,906 — 77,447 — April 2016 Mortgage/Mezzanine Loan (9) — — 109,910 109,527 June 2016 Mezzanine Loan (10) — 160,000 22,599 22,573 June 2016 Mezzanine Loan — 115,000 24,913 24,910 July 2016 Mezzanine Loan 11,364 296,966 62,615 — November 2016 Mezzanine Loan — 360,000 99,269 99,023 November 2016 Mezzanine Loan (11) 15,009 123,343 46,050 42,750 December 2016 Mezzanine Loan 553 38,423 13,434 11,835 December 2016 Mortgage/Mezzanine Loan (12) 72,842 — 117,999 — January 2017 Mezzanine Loan 8,466 92,705 21,306 20,651 January 2017 Jr. Mortgage Participation/Mezzanine Loan 2,101 114,497 39,383 38,524 July 2017 Mortgage/Mezzanine Loan — — 22,840 22,803 July 2017 Mortgage/Mezzanine Loan — — 16,874 16,848 September 2017 Mezzanine Loan — 60,000 14,880 14,859 November 2017 Mortgage/Mezzanine Loan (13) 795 — 14,892 14,845 December 2017 Jr. Mortgage Participation — 40,000 19,815 — April 2018 Mezzanine Loan — 350,000 34,671 — April 2018 Jr. Mortgage Participation/Mezzanine Loan — 55,000 20,522 20,533 July 2018 Mortgage/Mezzanine Loan — — 18,237 18,083 February 2019 Mezzanine Loan — 38,000 21,825 21,807 March 2019 Mezzanine Loan (14) — — — 33,726 Mezzanine Loan (14) — — — 37,322 Total floating rate $ 130,036 $ 2,728,934 $ 943,377 $ 693,635 Total $ 135,699 $ 5,582,034 $ 1,516,295 $ 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 was sold in July 2015 and the $23.2 million mezzanine loan matures in May 2016. (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) In May 2015, the maturity date was extended to June 2016. (10) 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. (11) In February 2015, the maturity date was extended to December 2016. (12) 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. (13) 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. (14) These loans were repaid in April 2015. Preferred Equity Investments As of June 30, 2015 and December 31, 2014 , we held the following preferred equity investments with an aggregate weighted average current yield of 10.18% at June 30, 2015 (in thousands): Type June 30, 2015 Future Funding Obligations June 30, 2015 Senior Financing June 30, 2015 Carrying Value (1) December 31, 2014 (1) Initial Mandatory Redemption Preferred equity (2)(3) $ — $ 550,000 $ 126,817 $ 123,041 July 2015 Preferred equity (4) — 70,000 9,960 9,954 March 2018 Preferred equity 5,580 60,795 32,162 — November 2018 $ 5,580 $ 680,795 $ 168,939 $ 132,995 ____________________________________________________________________ (1) Carrying value is net of deferred origination fees. (2) The difference between the pay and accrual rates is included as an addition to the principal balance outstanding. (3) This investment was redeemed in July 2015. (4) In March 2015, the redemption date was extended to March 2018. At June 30, 2015 and December 31, 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 June 30, 2015 and December 31, 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 $111.5 million and $133.5 million at June 30, 2015 and December 31, 2014 , respectively. No financing receivables were 90 days past due at June 30, 2015 .

Investments in Unconsolidated J

Investments in Unconsolidated Joint Ventures	6 Months Ended
	Jun. 30, 2015
Equity Method Investments and Joint Ventures [Abstract]
Investments in Unconsolidated Joint Ventures	Investments in Unconsolidated Joint Ventures We have investments in several real estate joint ventures with various partners. As of June 30, 2015 and December 31, 2014 , 650 Fifth Avenue, 33 Beekman, and 3 Columbus Circle were VIEs in which we are not the primary beneficiary. Our net equity investment in these VIEs was $98.3 million and $146.2 million at June 30, 2015 and December 31, 2014 , respectively. All other investments below are voting interest entities. As we do not control the joint ventures listed below, we account for them under the equity method of accounting. The table below provides general information on each of our joint ventures as of June 30, 2015 : Property Partner Ownership Interest Economic Interest Approximate Square Feet Acquisition Date Acquisition Price (1) (in thousands) 100 Park Avenue Prudential Real Estate Investors 49.90% 49.90% 834,000 January 2000 $ 95,800 717 Fifth Avenue Jeff Sutton/Private Investor 10.92% 10.92% 119,500 September 2006 251,900 800 Third Avenue (2) Private Investors 60.52% 60.52% 526,000 December 2006 285,000 1745 Broadway Ivanhoe Cambridge, Inc. 56.88% 56.88% 674,000 April 2007 520,000 Jericho Plaza Onyx Equities/Credit Suisse 20.26% 20.26% 640,000 April 2007 210,000 The Meadows (3) Onyx Equities 50.00% 50.00% 582,100 September 2007 111,500 600 Lexington Avenue Canadian Pension Plan Investment Board 55.00% 55.00% 303,515 May 2010 193,000 Property Partner Ownership Interest Economic Interest Approximate Square Feet Acquisition Date Acquisition Price (1) (in thousands) 11 West 34th Street Private Investor/ Jeff Sutton 30.00% 30.00% 17,150 December 2010 10,800 7 Renaissance Louis Cappelli 50.00% 50.00% 65,641 December 2010 4,000 3 Columbus Circle (4) The Moinian Group 48.90% 48.90% 741,500 January 2011 500,000 280 Park Avenue Vornado Realty Trust 50.00% 50.00% 1,219,158 March 2011 400,000 1552-1560 Broadway (5) Jeff Sutton 50.00% 50.00% 35,897 August 2011 136,550 724 Fifth Avenue Jeff Sutton 50.00% 50.00% 65,040 January 2012 223,000 10 East 53rd Street Canadian Pension Plan Investment Board 55.00% 55.00% 354,300 February 2012 252,500 33 Beekman (6) Harel Insurance and Finance/TNG 33 LLC 45.90% 45.90% — August 2012 31,000 521 Fifth Avenue Plaza Global Real Estate Partners LP 50.50% 50.50% 460,000 November 2012 315,000 21 East 66th Street (7) Private Investors 32.28% 32.28% 16,736 December 2012 75,000 315 West 36th Street Private Investors 35.50% 35.50% 147,619 December 2012 45,000 650 Fifth Avenue (8) Jeff Sutton 50.00% 50.00% 32,324 November 2013 — 121 Greene Street Jeff Sutton 50.00% 50.00% 7,131 September 2014 27,400 175-225 Third Street KCLW 3rd Street LLC/LIVWRK LLC 95.00% 95.00% — October 2014 74,600 55 West 46th Street Prudential Real Estate Investors 25.00% 25.00% 347,000 November 2014 295,000 Stonehenge Portfolio (9) Various Various Various 2,046,733 February 2015 36,668 ____________________________________________________________________ (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 March 2015, we acquired an additional 17.56% interest in this joint venture for $67.5 million . (3) In June 2015, we entered into an agreement to sell the property for $121.1 million . This transaction is expected to close during the third quarter of 2015, subject to customary closing conditions. (4) As a result of the sale of a condominium interest in September 2012, Young & Rubicam, Inc., or Y&R, owns floors three through eight at the property. Because the joint venture has an option to repurchase these floors, the gain associated with this sale was deferred. (5) The purchase price represents only the purchase of the 1552 Broadway interest which comprised approximately 13,045 square feet. The joint venture also owns a long-term leasehold interest in the retail space and certain other spaces at 1560 Broadway, which is adjacent to 1552 Broadway. (6) As of June 30, 2015, the redevelopment project was substantially complete and will be conveyed to Pace University during the third quarter of 2015. (7) We hold a 32.28% interest in three retail and two residential units at the property and a 16.14% interest in three residential units at the property. (8) The joint venture owns a long-term leasehold interest in the retail space at 650 Fifth Avenue. In connection with the ground lease obligation, SLG provided a performance guaranty and our joint venture partner executed a contribution agreement to reflect its pro rata obligation. In the event the property is converted into a condominium unit and the landlord elects the purchase option, the joint venture shall be obligated to acquire the unit at the then fair value. (9) In February 2015, we acquired an interest in a portfolio of Manhattan residential and retail properties for $40.2 million , of which $3.5 million represented an increase in ownership interest in six of our existing consolidated joint venture properties. The $40.2 million of consideration included the issuance of $40.0 million aggregate liquidation preference of 3.75% Series M Preferred Units of limited partnership interest of the Operating Partnership. Acquisition, Development and Construction Arrangements Based on the characteristics of the following arrangements, which are similar to those of an investment, combined with the expected residual profit of not greater than 50% , we have accounted for these debt and preferred equity investments under the equity method. As of June 30, 2015 and December 31, 2014 , the carrying value for acquisition, development and construction arrangements were as follows (in thousands): Loan Type June 30, 2015 December 31, 2014 Initial Maturity Date Mezzanine loan and preferred equity $ 99,777 $ 99,629 March 2016 Mezzanine loan (1) 45,913 46,246 February 2022 $ 145,690 $ 145,875 ____________________________________________________________________ (1) We have an option to convert our loan to equity interest subject to certain conditions. In addition, we have determined that our option to convert the loan to equity is not a derivative financial instrument pursuant to Generally Accepted Accounting Principles, or GAAP. As such, the embedded feature is not required to be bifurcated and the fair value accounting for the embedded feature at each reporting date is not applicable. Mortgages and Other Loans Payable We generally finance our joint ventures with non-recourse debt. However, in certain cases we have provided guarantees or master leases for tenant space. These guarantees and master leases terminate upon the satisfaction of specified circumstances or repayment of the underlying loans. The first mortgage notes and other loans payable collateralized by the respective joint venture properties and assignment of leases at June 30, 2015 and December 31, 2014 , respectively, are as follows (amounts in thousands): Property Maturity Date Interest Rate (1) June 30, 2015 December 31, 2014 Fixed Rate Debt: 7 Renaissance December 2015 10.00 % $ 2,600 $ 2,147 11 West 34th Street January 2016 4.82 % 16,749 16,905 280 Park Avenue June 2016 6.57 % 696,563 700,171 1745 Broadway January 2017 5.68 % 340,000 340,000 Jericho Plaza (2) May 2017 5.65 % 163,750 163,750 800 Third Avenue August 2017 6.00 % 20,910 20,910 315 West 36th Street (3) December 2017 3.16 % 25,000 25,000 521 Fifth Avenue November 2019 3.73 % 170,000 170,000 717 Fifth Avenue (4) July 2022 4.45 % 300,000 300,000 21 East 66th Street April 2023 3.60 % 12,000 12,000 717 Fifth Avenue (4) July 2024 9.00 % 319,900 314,381 3 Columbus Circle (5) March 2025 3.61 % 350,000 — Stonehenge Portfolio (6) Various 4.18 % 434,492 — Total fixed rate debt $ 2,851,964 $ 2,065,264 Floating Rate Debt: The Meadows September 2015 7.75 % 67,350 67,350 1552 Broadway (7) April 2016 4.26 % 188,410 184,210 Other loan payable June 2016 1.08 % 30,000 30,000 650 Fifth Avenue (8) October 2016 3.69 % 65,000 65,000 175-225 Third Street December 2016 4.25 % 40,000 40,000 10 East 53rd Street February 2017 2.69 % 125,000 125,000 724 Fifth Avenue April 2017 2.60 % 275,000 275,000 33 Beekman (9) August 2017 2.93 % 65,506 52,283 600 Lexington Avenue October 2017 2.28 % 114,774 116,740 55 West 46th Street (10) October 2017 2.49 % 150,000 150,000 Stonehenge Portfolio December 2017 3.25 % 10,500 — 121 Greene Street November 2019 1.69 % 15,000 15,000 100 Park Avenue February 2021 1.94 % 360,000 360,000 21 East 66th Street June 2033 2.88 % 1,844 1,883 3 Columbus Circle (5) — 230,974 Total floating rate debt $ 1,508,384 $ 1,713,440 Total joint venture mortgages and other loans payable $ 4,360,348 $ 3,778,704 ____________________________________________________________________ (1) Effective weighted average interest rate for the three months ended June 30, 2015 , taking into account interest rate hedges in effect during the period. (2) This loan is in default as of June 30, 2015 due to the non-payment of debt service. The joint venture is in discussions with the special servicer on account of the loan. (3) In July 2015, the joint venture refinanced the previous mortgage. (4) These loans are comprised of a $300.0 million fixed rate mortgage loan and $290.0 million mezzanine loan. The mezzanine loan is subject to accretion based on the difference between contractual interest rate and contractual pay rate. (5) In March 2015, the joint venture refinanced the previous mortgage and incurred a net loss on early extinguishment of debt of $0.8 million . (6) Amount is comprised of $13.5 million , $56.0 million , $35.0 million , $7.4 million , $142.7 million , and $179.9 million in fixed-rate mortgages that mature in July 2016, June 2017, November 2017, February 2018, August 2019, and June 2024, respectively. (7) These loans are comprised of a $150.0 million mortgage loan and a $41.5 million mezzanine loan. As of June 30, 2015 , $1.7 million of the mortgage loan and $1.4 million of the mezzanine loan was unfunded. (8) This loan has a committed amount of $97.0 million , of which $32.0 million was unfunded as of June 30, 2015 . (9) This loan has a committed amount of $75.0 million , of which $18.4 million is recourse to us. Our partner has indemnified us for its pro rata share of the recourse guarantee. A portion of the guarantee terminates upon the joint venture reaching certain milestones. We believe it is unlikely that we will be required to perform under this guarantee. (10) This loan has a committed amount of $190.0 million , of which $40.0 million was unfunded as of June 30, 2015 . We act as the operating partner and day-to-day manager for all our joint ventures, except for 800 Third Avenue, Jericho Plaza, 280 Park Avenue, 3 Columbus Circle, The Meadows, 315 West 36th Street, 21 East 66th Street, 175-225 Third Street and the Stonehenge Portfolio. We are entitled to receive fees for providing management, leasing, construction supervision and asset management services to certain of our joint ventures. We earned $2.1 million , $4.9 million , $4.8 million and $11.2 million from these services for the three and six months ended June 30, 2015 and 2014 , respectively. In addition, we have the ability to earn incentive fees based on the ultimate financial performance of certain of the joint venture properties. The combined balance sheets for the unconsolidated joint ventures, at June 30, 2015 and December 31, 2014, are as follows (in thousands): June 30, 2015 December 31, 2014 Assets Commercial real estate property, net $ 6,124,617 $ 5,275,632 Other assets 924,855 810,567 Total assets $ 7,049,472 $ 6,086,199 Liabilities and members' equity Mortgages and other loans payable $ 4,360,348 $ 3,778,704 Other liabilities 495,523 485,572 Members' equity 2,193,601 1,821,923 Total liabilities and members' equity $ 7,049,472 $ 6,086,199 Company's investments in unconsolidated joint ventures $ 1,262,723 $ 1,172,020 The combined statements of income for the unconsolidated joint ventures, from acquisition date through the three and six months ended June 30, 2015 and 2014 are as follows (in thousands): Three Months Ended June 30, Six Months Ended June 30, 2015 2014 2015 2014 Total revenues $ 143,535 $ 130,495 $ 272,451 $ 291,633 Operating expenses 26,345 18,362 51,831 45,045 Ground rent 2,572 2,632 5,164 4,657 Real estate taxes 22,335 15,406 41,711 32,342 Interest expense, net of interest income 51,715 44,728 95,722 97,064 Amortization of deferred financing costs 3,145 2,026 6,155 6,659 Transaction related costs, net of recoveries 3 (207 ) 11 64 Depreciation and amortization 37,894 33,858 70,878 79,462 Total expenses 144,009 116,805 271,472 265,293 Loss on early extinguishment of debt — (3,546 ) (833 ) (6,743 ) Net income (loss) before gain on sale $ (474 ) $ 10,144 $ 146 $ 19,597 Company's equity in net income from unconsolidated joint ventures $ 2,994 $ 8,619 $ 7,024 $ 14,748

Deferred Costs

Deferred Costs	6 Months Ended
	Jun. 30, 2015
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Deferred Costs	Deferred Costs Deferred costs at June 30, 2015 and December 31, 2014 consisted of the following (in thousands): June 30, 2015 December 31, 2014 Deferred leasing $ 406,498 $ 385,555 Deferred financing 191,980 193,776 598,478 579,331 Less accumulated amortization (269,640 ) (251,369 ) Deferred costs, net $ 328,838 $ 327,962

Mortgages and Other Loans Payab

Mortgages and Other Loans Payable	6 Months Ended
	Jun. 30, 2015
Mortgages and Other Loans Payable
Mortgages and Other Loans Payable	Mortgages and Other Loans Payable The first mortgages and other loans payable collateralized by the respective properties and assignment of leases at June 30, 2015 and December 31, 2014 , respectively, were as follows (amounts in thousands): Property Maturity Date Interest Rate (1) June 30, 2015 December 31, 2014 Fixed Rate Debt: 500 West Putnam Avenue January 2016 5.52 % $ 22,676 $ 22,968 Landmark Square December 2016 4.00 % 80,424 81,269 485 Lexington Avenue February 2017 5.61 % 450,000 450,000 120 West 45th Street (2) February 2017 6.12 % 170,000 170,000 762 Madison Avenue (3) February 2017 3.86 % 7,959 8,045 885 Third Avenue July 2017 6.26 % 267,650 267,650 1745 Broadway June 2018 4.81 % 16,000 16,000 388-390 Greenwich Street (4) June 2018 3.25 % 1,004,000 1,004,000 One Madison Avenue May 2020 5.91 % 554,405 565,742 100 Church Street July 2022 4.68 % 226,862 228,612 919 Third Avenue (5) June 2023 5.12 % 500,000 500,000 400 East 57th Street February 2024 4.13 % 68,276 68,896 400 East 58th Street February 2024 4.13 % 29,261 29,527 420 Lexington Avenue October 2024 3.99 % 300,000 300,000 1515 Broadway March 2025 3.93 % 900,000 900,000 Series J Preferred Units (6) April 2051 3.75 % 4,000 4,000 711 Third Avenue (7) — 120,000 Total fixed rate debt $ 4,601,513 $ 4,736,709 Floating Rate Debt: Master Repurchase Agreement December 2015 3.44 % 106,421 100,000 388-390 Greenwich Street (4) June 2018 1.93 % 446,000 446,000 248-252 Bedford Avenue June 2019 1.69 % 29,000 29,000 220 East 42nd Street October 2020 1.79 % 275,000 275,000 180 Maiden Lane (8) — 253,942 Total floating rate debt $ 856,421 $ 1,103,942 Total fixed rate and floating rate debt $ 5,457,934 $ 5,840,651 Mortgages reclassed to liabilities related to assets held for sale (170,000 ) (253,942 ) Total mortgages and other loans payable $ 5,287,934 $ 5,586,709 ____________________________________________________________________ (1) Effective weighted average interest rate for the three months ended June 30, 2015 , taking into account interest rate hedges in effect during the period. (2) This property was held for sale at June 30, 2015 and the related mortgage is included in liabilities related to assets held for sale. (3) In February 2015, we entered into a new swap agreement with a fixed interest rate of 3.86% per annum, which replaced the previous swap agreement with a fixed interest rate of 3.75% per annum. (4) In connection with the acquisition of our joint venture partner's interest, we assumed the existing derivative instruments, which swapped $504.0 million of the mortgage to a fixed rate mortgage which bears interest at 3.80% per annum. In October 2014, we entered into multiple swap agreements to hedge our interest rate exposure on the additional $500.0 million portion of this mortgage, which was swapped to a fixed rate of 2.69% per annum. Including the as-of right extension option, this loan matures in June 2021. (5) We own a 51.0% controlling interest in the joint venture that is the borrower on this loan. (6) In connection with the acquisition of a commercial real estate property, the Operating Partnership issued $4.0 million , or 4,000 , 3.75% Series J Preferred Units of limited partnership interest, or the Series J Preferred Units, with a mandatory liquidation preference of $1,000.00 per unit. The Series J Preferred Units are accounted for as debt because they can be redeemed in cash by the Operating Partnership on the earlier of (i) the date of the sale of the property or (ii) April 30, 2051 or at the option of the unitholders as further prescribed in the related agreement. (7) In March 2015, we repaid the mortgage. (8) This property was held for sale at December 31, 2014 and the related mortgage is included in liabilities related to assets held for sale. In January 2015, the property was sold and the debt was repaid. The Master Repurchase Agreement, as amended in December 2013, or MRA, provides us with the ability to sell certain debt investments with a simultaneous agreement to repurchase the same at a certain date or on demand. This MRA has a maximum facility capacity of $300.0 million and bears interest ranging from 250 and 325 basis points over 30-day LIBOR depending on the pledged collateral. 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. At June 30, 2015 and December 31, 2014 , the gross book value of the properties and debt and preferred equity investments collateralizing the mortgages and other loans payable was approximately $7.9 billion and $8.2 billion , respectively.

Corporate Indebtedness

Corporate Indebtedness	6 Months Ended
	Jun. 30, 2015
Debt Disclosure [Abstract]
Corporate Indebtedness	Corporate Indebtedness 2012 Credit Facility In March 2014, we entered into an amendment to the $1.6 billion credit facility entered into by the Company in November 2012, or 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. In November 2014, we increased the term loan portion of the facility by $50.0 million to $833.0 million . In January 2015, we entered 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. We also have an option, subject to customary conditions, to increase the capacity under the revolving credit facility to $1.5 billion at any time prior to the maturity date for the revolving credit facility without the consent of existing lenders, by obtaining additional commitments from our existing lenders and other financial institutions. As of June 30, 2015 , the 2012 credit facility, as amended, consisted of a $1.2 billion revolving credit facility, or the revolving credit facility, and an $833.0 million term loan, or the term loan facility. As of June 30, 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 June 30, 2015 , the applicable spread was 125 basis points for revolving credit facility and 140 basis points for the term loan facility. At June 30, 2015 , the effective interest rate was 1.44% for the revolving credit facility and 1.66% for the term loan facility. We are required to pay quarterly in arrears a 12.5 to 30 basis point facility fee on the total commitments under the revolving credit facility based on the credit rating assigned to the senior unsecured long term indebtedness of ROP. As of June 30, 2015 , the facility fee was 25 basis points. As of June 30, 2015 , we had $89.4 million of outstanding letters of credit, $705.0 million drawn under the revolving credit facility and $833.0 million outstanding under the term loan facility, with total undrawn capacity of $405.6 million under the 2012 credit facility. The Company, the Operating Partnership and ROP are all borrowers jointly and severally obligated under the 2012 credit facility. None of our other subsidiaries are obligors under the 2012 credit facility. The 2012 credit facility includes certain restrictions and covenants (see Restrictive Covenants below). Senior Unsecured Notes The following table sets forth our senior unsecured notes and other related disclosures as of June 30, 2015 and December 31, 2014 , respectively, by scheduled maturity date (dollars in thousands): Issuance June 30, 2015 Unpaid Principal Balance June 30, 2015 Accreted Balance December 31, 2014 Accreted Balance Coupon Rate (1) Effective Rate Term (in Years) Maturity Date March 31, 2006 (2) $ 255,308 $ 255,272 $ 255,250 6.00 % 6.00 % 10 March 31, 2016 October 12, 2010 (3) 345,000 314,993 309,069 3.00 % 3.00 % 7 October 15, 2017 August 5, 2011 (4) 250,000 249,777 249,744 5.00 % 5.00 % 7 August 15, 2018 March 16, 2010 (4) 250,000 250,000 250,000 7.75 % 7.75 % 10 March 15, 2020 November 15, 2012 (4) 200,000 200,000 200,000 4.50 % 4.50 % 10 December 1, 2022 March 26, 2007 (5) 10,008 10,008 10,008 3.00 % 3.00 % 20 March 30, 2027 June 27, 2005 (2)(6) — — 7 $ 1,310,316 $ 1,280,050 $ 1,274,078 ____________________________________________________________________ (1) Interest on the senior unsecured notes is payable semi-annually with principal and unpaid interest due on the scheduled maturity dates. (2) Issued by ROP. (3) Issued by the Operating Partnership. Interest on these exchangeable notes is payable semi-annually on April 15 and October 15. The notes had an initial exchange rate representing an exchange price that was set at a 30.0% premium to the last reported sale price of SL Green's common stock on October 6, 2010, or $85.81 . The initial exchange rate is subject to adjustment under certain circumstances. The current exchange rate is 12.2163 shares of SL Green's common stock per $1,000 principal amount of these notes. The notes are senior unsecured obligations of the Operating Partnership and are exchangeable upon the occurrence of specified events and during the period beginning on the twenty-second scheduled trading day prior to the maturity date and ending on the second business day prior to the maturity date, into cash or a combination of cash and shares of SL Green's common stock, if any, at our option. As a result of meeting specified events (as defined in the Indenture Agreement), these notes became exchangeable commencing January 1, 2015 and will remain exchangeable through September 30, 2015. The notes are guaranteed by ROP. On the issuance date, $78.3 million of the debt balance was recorded in equity. As of June 30, 2015 , $30.0 million remained to be amortized into the debt balance. (4) Issued by the Company, the Operating Partnership and ROP, as co-obligors. (5) Issued by the Operating Partnership. Interest on these remaining exchangeable notes is payable semi-annually on March 30 and September 30. The notes have an initial exchange rate representing an exchange price that was set at a 25.0% premium to the last reported sale price of the Company's common stock on March 20, 2007, or $173.30 . The initial exchange rate is subject to adjustment under certain circumstances. The current exchange rate is 5.7952 shares of SL Green's common stock per $1,000 principal amount of these notes. The notes are senior unsecured obligations of the Operating Partnership and are exchangeable upon the occurrence of specified events and during the period beginning on the twenty-second scheduled trading day prior to the maturity date and ending on the second business day prior to the maturity date, into cash or a combination of cash and shares of SL Green's common stock, if any, at our option. The notes are currently redeemable at the Operating Partnership’s option. The Operating Partnership may be required to repurchase the notes on March 30, 2017 and 2022, and upon the occurrence of certain designated events. (6) In April 2015, we redeemed the remaining outstanding debentures. Restrictive Covenants The terms of the 2012 credit facility, as amended, and certain of our senior unsecured notes include certain restrictions and covenants which may limit, among other things, our ability to pay dividends, make certain types of investments, incur additional indebtedness, incur liens and enter into negative pledge agreements and dispose of assets, and which require compliance with financial ratios relating to the maximum ratio of total indebtedness to total asset value, a minimum ratio of EBITDA to fixed charges, a maximum ratio of secured indebtedness to total asset value and a maximum ratio of unsecured indebtedness to unencumbered asset value. The dividend restriction referred to above provides that, we will not during any time when a default is continuing, make distributions with respect to common stock or other equity interests, except to enable the Company to continue to qualify as a REIT for Federal income tax purposes. As of June 30, 2015 and December 31, 2014 , we were in compliance with all such covenants. Junior Subordinated Deferrable Interest Debentures In June 2005, the Company and the Operating Partnership issued $100.0 million in unsecured trust preferred securities through a newly formed trust, SL Green Capital Trust I, or the Trust, which is a wholly-owned subsidiary of the Operating Partnership. The securities mature in 2035 and bear interest at a fixed rate of 5.61% for the first ten years ending July 2015. Thereafter, the interest rate will float at 125 basis points over the three-month LIBOR. Interest payments may be deferred for a period of up to eight consecutive quarters if the Operating Partnership exercises its right to defer such payments. The Trust preferred securities are redeemable at the option of the Operating Partnership, in whole or in part, with no prepayment premium. We do not consolidate the Trust even though it is a variable interest entity as we are not the primary beneficiary. Because the Trust is not consolidated, we have recorded the debt on our consolidated balance sheets and the related payments are classified as interest expense. Principal Maturities Combined aggregate principal maturities of mortgages and other loans payable, 2012 credit facility, trust preferred securities, senior unsecured notes and our share of joint venture debt as of June 30, 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 Trust Preferred Securities Senior Unsecured Notes Total Joint Venture Debt Remaining 2015 $ 15,354 $ 106,421 $ — $ — $ — $ — $ 121,775 $ 38,176 2016 47,360 100,311 — — — 255,308 402,979 534,057 2017 (1) 61,063 895,329 — — — 355,008 1,311,400 585,526 2018 64,462 16,000 — — — 250,000 330,462 2,196 2019 70,409 28,317 — 833,000 — — 931,726 104,687 Thereafter 200,403 3,852,505 705,000 — 100,000 450,000 5,307,908 446,742 $ 459,051 $ 4,998,883 $ 705,000 $ 833,000 $ 100,000 $ 1,310,316 $ 8,406,250 $ 1,711,384 ___________________________________________________________________ (1) Scheduled principal repayments include the mortgage at 120 West 45th Street, which is included in liabilities related to assets held for sale. Consolidated interest expense, excluding capitalized interest, was comprised of the following (in thousands): Three Months Ended June 30, Six Months Ended June 30, 2015 2014 2015 2014 Interest expense $ 76,472 $ 78,419 $ 152,930 $ 155,127 Interest income (726 ) (549 ) (1,377 ) (1,079 ) Interest expense, net $ 75,746 $ 77,870 $ 151,553 $ 154,048 Interest capitalized $ 7,611 $ 6,218 $ 16,169 $ 10,490

Related Party Transactions

Related Party Transactions	6 Months Ended
	Jun. 30, 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. The Service Corporation has entered into an arrangement with Alliance whereby it will receive a profit participation above a certain threshold for services provided by Alliance to certain tenants at certain buildings above the base services specified in their lease agreements. Income earned from profit participation, which is included in other income on the consolidated statements of operations, was $1.0 million and $1.9 million for both the three and six months ended June 30, 2015 and 2014, respectively. We also recorded expenses of $4.6 million , $8.6 million , $5.0 million and $8.8 million for the three and six months ended June 30, 2015 and 2014 , respectively, for these services (excluding services provided directly to tenants). Management Fees S.L. Green Management Corp., a consolidated entity, receives property management fees from an entity in which Stephen L. Green owns an interest. We received management fees from such entity of $0.1 million and $0.2 million for both the three and six months ended June 30, 2015 and 2014, respectively. Other Amounts due from related parties at June 30, 2015 and December 31, 2014 consisted of the following (in thousands): June 30, 2015 December 31, 2014 Due from joint ventures $ 1,308 $ 1,254 Other 10,087 10,481 Related party receivables $ 11,395 $ 11,735

Noncontrolling Interests on the

Noncontrolling Interests on the Company's Consolidated Financial Statements	6 Months Ended
	Jun. 30, 2015
Noncontrolling Interest [Abstract]
Noncontrolling Interests on the Company's Consolidated Financial Statements	Noncontrolling Interests on the Company's Consolidated Financial Statements Noncontrolling interests represent the common and preferred units of limited partnership interest in the Operating Partnership not held by the Company as well as third party equity interests in our other consolidated subsidiaries. Noncontrolling interests in the Operating Partnership are shown in the mezzanine equity while the noncontrolling interests in our other consolidated subsidiaries are shown in the equity section of the Company’s consolidated financial statements. Common Units of Limited Partnership Interest in the Operating Partnership As of June 30, 2015 and December 31, 2014, the noncontrolling interest unit holders owned 3.78% , or 3,907,117 units, and 3.92% , or 3,973,016 units, of the Operating Partnership, respectively. At June 30, 2015 , 3,907,117 shares of SL Green's common stock were reserved for issuance upon redemption of units of limited partnership interest of the Operating Partnership. Noncontrolling interests in the Operating Partnership is recorded at the greater of its cost basis or fair market value based on the closing stock price of SL Green's common stock at the end of the reporting period. Below is the rollforward analysis of the activity relating to the noncontrolling interests in the Operating Partnership as of June 30, 2015 and December 31, 2014 (in thousands): June 30, 2015 December 31, 2014 Balance at beginning of period $ 469,524 $ 265,476 Distributions (4,693 ) (7,849 ) Issuance of common units 25,241 56,469 Redemption of common units (37,992 ) (31,653 ) Net income 166 18,467 Accumulated other comprehensive income allocation (158 ) 175 Fair value adjustment (20,670 ) 168,439 Balance at end of period $ 431,418 $ 469,524 Preferred Units of Limited Partnership Interest in the Operating Partnership The Operating Partnership has 1,902,000 4.50% Series G Preferred Units of limited partnership interest, or the Series G Preferred Units outstanding, with a liquidation preference of $25.00 per unit, which were issued in January 2012 in conjunction with an acquisition. The Series G Preferred unitholders receive annual dividends of $1.125 per unit paid on a quarterly basis and dividends are cumulative, subject to certain provisions. The Series G Preferred Units are convertible into a number of common units of limited partnership interest in the Operating Partnership equal to (i) the liquidation preference plus accumulated and unpaid distributions on the conversion date divided by (ii) $88.50 . The common units of limited partnership interest in the Operating Partnership may be redeemed in exchange for SL Green's common stock on a 1 -to-1 basis. The Series G Preferred Units also provide the holder with the right to require the Operating Partnership to repurchase the Series G Preferred Units for cash before January 31, 2022. The Operating Partnership has 60 Series F Preferred Units outstanding with a mandatory liquidation preference of $1,000.00 per unit. The Operating Partnership has authorized up to 700,000 3.50% Series K Preferred Units of limited partnership interest, or the Series K Preferred Units, with a liquidation preference of $25.00 per unit. In August 2014, the Company issued 563,954 Series K Preferred Units in conjunction with an acquisition. The Series K Preferred unitholders receive annual dividends of $0.875 per unit paid on a quarterly basis and dividends are cumulative, subject to certain provisions. The Series K Preferred Units can be redeemed at any time, at the option of the unitholder, either for cash or are convertible into a number of common units of limited partnership interest in the Operating Partnership equal to (i) the liquidation preference plus accumulated and unpaid distributions on the conversion date divided by (ii) $134.67 . The Operating Partnership has authorized up to 500,000 4.00% Series L Preferred Units of limited partnership interest, or the Series L Preferred Units, with a liquidation preference of $25.00 per unit. In August 2014, the Company issued 378,634 Series L Preferred Units in conjunction with an acquisition. The Series L Preferred unitholders receive annual dividends of $1.00 per unit paid on a quarterly basis and dividends are cumulative, subject to certain provisions. The Series L Preferred Units can be redeemed at any time at par for cash at the option of the unitholder. The Operating Partnership has authorized up to 1,600,000 3.75% Series M Preferred Units of limited partnership interest, or the Series M Preferred Units, with a liquidation preference of $25.00 per unit. In February 2015, the Company issued 1,600,000 Series M Preferred Units in conjunction with the acquisition of ownership interests in and relating to certain residential and retail real estate properties. The Series M Preferred unitholders receive annual dividends of $0.9375 per unit paid on a quarterly basis and dividends are cumulative, subject to certain provisions. The Series M Preferred Units can be redeemed at any time at par for cash at the option of the unitholder. The Operating Partnership has authorized up to 552,303 3.00% Series N Preferred Units of limited partnership interest, or the Series N Preferred Units, with a liquidation preference of $25.00 per unit. In June 2015, the Company issued 552,303 Series N Preferred Units in conjunction with an acquisition. The Series N Preferred unitholders receive annual dividends of $0.75 per unit paid on a quarterly basis and dividends are cumulative, subject to certain provisions. The Series N Preferred Units can be redeemed at any time at par for cash at the option of the unitholder. The Operating Partnership has authorized an aggregate of one 6.25% Series O Preferred Unit of limited partnership interest, or the Series O Preferred Unit. In June 2015, the Company issued the Series O Preferred Unit in connection with an acquisition. Below is the rollforward analysis of the activity relating to the preferred units in the Operating Partnership as of June 30, 2015 and December 31, 2014 (in thousands): June 30, 2015 December 31, 2014 Balance at beginning of period $ 71,115 $ 49,550 Issuance of preferred units 53,808 23,565 Redemption of preferred units (200 ) (2,000 ) Balance at end of period $ 124,723 $ 71,115

Stockholders' Equity of the Com

Stockholders' Equity of the Company	6 Months Ended
	Jun. 30, 2015
Stockholders' Equity Note [Abstract]
Stockholders' Equity of the Company	Stockholders’ Equity of the Company Common Stock Our authorized capital stock consists of 260,000,000 shares, $0.01 par value per share, consisting of 160,000,000 shares of common stock, $0.01 par value per share, 75,000,000 shares of excess stock, at $0.01 par value per share, and 25,000,000 shares of preferred stock, par value $0.01 per share. As of June 30, 2015 , 99,589,645 shares of common stock and no shares of excess stock were issued and outstanding. At-The-Market Equity Offering Program In June 2014, the Company, along with the Operating Partnership, entered into an "at-the-market" equity offering program, or ATM Program, to sell an aggregate of $300.0 million of SL Green's common stock. During the three months ended March 31, 2015, we sold 895,956 shares of our common stock for aggregate net proceeds of $113.4 million comprising the remaining balance of this ATM Program. The net proceeds from these offerings were contributed to the Operating Partnership in exchange for 895,956 units of limited partnership interest of the Operating Partnership. In March 2015, the Company, along with the Operating Partnership, entered into a new ATM Program to sell an aggregate of $300.0 million of SL Green's common stock. During the six months ended June 30, 2015 , we sold 91,180 shares of our common stock for aggregate net proceeds of $12.0 million . The net proceeds from these offerings were contributed to the Operating Partnership in exchange for 91,180 units of limited partnership interest of the Operating Partnership. As of June 30, 2015 , $288.0 million remained available for issuance of common stock under the new ATM program. Perpetual Preferred Stock We have 9,200,000 shares of our 6.50% Series I Cumulative Redeemable Preferred Stock, or the Series I Preferred Stock, outstanding with a mandatory liquidation preference of $25.00 per share. The Series I Preferred stockholders receive annual dividends of $1.625 per share paid on a quarterly basis and dividends are cumulative, subject to certain provisions. We are entitled to redeem the Series I Preferred Stock at par for cash at our option on or after August 10, 2017. In August 2012, we received $221.9 million in net proceeds from the issuance of the Series I Preferred Stock, which were recorded net of underwriters' discount and issuance costs, and contributed the net proceeds to the Operating Partnership in exchange for 9,200,000 units of 6.50% Series I Cumulative Redeemable Preferred Units of limited partnership interest, or the Series I Preferred Units. Dividend Reinvestment and Stock Purchase Plan In February 2015, the Company filed a registration statement with the SEC for our dividend reinvestment and stock purchase plan, or DRSPP, which automatically became effective upon filing. The Company registered 3,500,000 shares of SL Green's common stock under the DRSPP. The DRSPP commenced on September 24, 2001. During the six months ended June 30, 2015 , the Company issued 775,316 shares of SL Green's common stock and received net proceeds of $99.5 million of proceeds from dividend reinvestments and/or stock purchases under the DRSPP. DRSPP shares may be issued at a discount to the market price. Earnings per Share SL Green's earnings per share for the three and six months ended June 30, 2015 and 2014 are computed as follows (in thousands): Three Months Ended June 30, Six Months Ended June 30, Numerator 2015 2014 2015 2014 Basic Earnings: (Loss) income attributable to SL Green common stockholders $ (39,106 ) $ 235,541 $ 4,171 $ 381,631 Effect of Dilutive Securities: Redemption of units to common shares — 8,645 166 13,374 Diluted Earnings: (Loss) income attributable to SL Green common stockholders $ (39,106 ) $ 244,186 $ 4,337 $ 395,005 Three Months Ended June 30, Six Months Ended June 30, Denominator 2015 2014 2015 2014 Basic Shares: Weighted average common stock outstanding 99,579 95,455 98,994 95,288 Effect of Dilutive Securities: Redemption of units to common shares — 3,515 3,936 3,339 Stock-based compensation plans — 514 493 501 Diluted weighted average common stock outstanding 99,579 99,484 103,423 99,128 SL Green has excluded 228,122 , 212,317 , 748,000 and 797,000 common stock equivalents from the diluted shares outstanding for the three and six months ended June 30, 2015 and 2014, respectively, as they were anti-dilutive. Additionally, SL Green has excluded 4,367,272 from the diluted shares outstanding for three months ended June 30, 2015 as they were anti-dilutive as a result of the net loss attributable to SL Green common stockholders.

Partners' Capital of the Operat

Partners' Capital of the Operating Partnership	6 Months Ended
	Jun. 30, 2015
Stockholders' Equity
Partners' Capital of the Operating Partnership	Stockholders’ Equity of the Company Common Stock Our authorized capital stock consists of 260,000,000 shares, $0.01 par value per share, consisting of 160,000,000 shares of common stock, $0.01 par value per share, 75,000,000 shares of excess stock, at $0.01 par value per share, and 25,000,000 shares of preferred stock, par value $0.01 per share. As of June 30, 2015 , 99,589,645 shares of common stock and no shares of excess stock were issued and outstanding. At-The-Market Equity Offering Program In June 2014, the Company, along with the Operating Partnership, entered into an "at-the-market" equity offering program, or ATM Program, to sell an aggregate of $300.0 million of SL Green's common stock. During the three months ended March 31, 2015, we sold 895,956 shares of our common stock for aggregate net proceeds of $113.4 million comprising the remaining balance of this ATM Program. The net proceeds from these offerings were contributed to the Operating Partnership in exchange for 895,956 units of limited partnership interest of the Operating Partnership. In March 2015, the Company, along with the Operating Partnership, entered into a new ATM Program to sell an aggregate of $300.0 million of SL Green's common stock. During the six months ended June 30, 2015 , we sold 91,180 shares of our common stock for aggregate net proceeds of $12.0 million . The net proceeds from these offerings were contributed to the Operating Partnership in exchange for 91,180 units of limited partnership interest of the Operating Partnership. As of June 30, 2015 , $288.0 million remained available for issuance of common stock under the new ATM program. Perpetual Preferred Stock We have 9,200,000 shares of our 6.50% Series I Cumulative Redeemable Preferred Stock, or the Series I Preferred Stock, outstanding with a mandatory liquidation preference of $25.00 per share. The Series I Preferred stockholders receive annual dividends of $1.625 per share paid on a quarterly basis and dividends are cumulative, subject to certain provisions. We are entitled to redeem the Series I Preferred Stock at par for cash at our option on or after August 10, 2017. In August 2012, we received $221.9 million in net proceeds from the issuance of the Series I Preferred Stock, which were recorded net of underwriters' discount and issuance costs, and contributed the net proceeds to the Operating Partnership in exchange for 9,200,000 units of 6.50% Series I Cumulative Redeemable Preferred Units of limited partnership interest, or the Series I Preferred Units. Dividend Reinvestment and Stock Purchase Plan In February 2015, the Company filed a registration statement with the SEC for our dividend reinvestment and stock purchase plan, or DRSPP, which automatically became effective upon filing. The Company registered 3,500,000 shares of SL Green's common stock under the DRSPP. The DRSPP commenced on September 24, 2001. During the six months ended June 30, 2015 , the Company issued 775,316 shares of SL Green's common stock and received net proceeds of $99.5 million of proceeds from dividend reinvestments and/or stock purchases under the DRSPP. DRSPP shares may be issued at a discount to the market price. Earnings per Share SL Green's earnings per share for the three and six months ended June 30, 2015 and 2014 are computed as follows (in thousands): Three Months Ended June 30, Six Months Ended June 30, Numerator 2015 2014 2015 2014 Basic Earnings: (Loss) income attributable to SL Green common stockholders $ (39,106 ) $ 235,541 $ 4,171 $ 381,631 Effect of Dilutive Securities: Redemption of units to common shares — 8,645 166 13,374 Diluted Earnings: (Loss) income attributable to SL Green common stockholders $ (39,106 ) $ 244,186 $ 4,337 $ 395,005 Three Months Ended June 30, Six Months Ended June 30, Denominator 2015 2014 2015 2014 Basic Shares: Weighted average common stock outstanding 99,579 95,455 98,994 95,288 Effect of Dilutive Securities: Redemption of units to common shares — 3,515 3,936 3,339 Stock-based compensation plans — 514 493 501 Diluted weighted average common stock outstanding 99,579 99,484 103,423 99,128 SL Green has excluded 228,122 , 212,317 , 748,000 and 797,000 common stock equivalents from the diluted shares outstanding for the three and six months ended June 30, 2015 and 2014, respectively, as they were anti-dilutive. Additionally, SL Green has excluded 4,367,272 from the diluted shares outstanding for three months ended June 30, 2015 as they were anti-dilutive as a result of the net loss attributable to SL Green common stockholders.
SL Green Operating Partnership
Stockholders' Equity
Partners' Capital of the Operating Partnership	Partners' Capital of the Operating Partnership The Company is the sole general partner of the Operating Partnership and at June 30, 2015 owned 99,589,645 general and limited partnership interests in the Operating Partnership and 9,200,000 Series I Preferred Units. Partnership interests in the Operating Partnership are denominated as “common units of limited partnership interest” (also referred to as “OP Units”) or “preferred units of limited partnership interest” (also referred to as “Preferred Units”). All references to OP Units and Preferred Units outstanding exclude such units held by the Company. A holder of an OP Unit may present such OP Unit to the Operating Partnership for redemption at any time (subject to restrictions agreed upon at the issuance of OP Units to particular holders that may restrict such right for a period of time, generally one year from issuance). Upon presentation of an OP Unit for redemption, the Operating Partnership must redeem such OP Unit in exchange for the cash equal to the then value of a share of common stock of the Company, except that the Company may, at its election, in lieu of cash redemption, acquire such OP Unit for one share of common stock. Because the number of shares of common stock outstanding at all times equals the number of OP Units that the Company owns, one share of common stock is generally the economic equivalent of one OP Unit, and the quarterly distribution that may be paid to the holder of an OP Unit equals the quarterly dividend that may be paid to the holder of a share of common stock. Each series of Preferred Units makes a distribution that is set in accordance with an amendment to the partnership agreement of the Operating Partnership. Preferred Units may also be convertible into OP Units at the election of the holder thereof or the Company, subject to the terms of such Preferred Units. Net income (loss) allocated to the preferred unitholders and common unitholders reflects their pro rata share of net income (loss) and distributions. Limited Partner Units As of June 30, 2015 , limited partners other than SL Green owned 3.78% , or 3,907,117 common units, of the Operating Partnership. Preferred Units Preferred units not owned by SL Green are further described in Note 11, “Noncontrolling Interests on the Company’s Consolidated Financial Statements - Preferred Units of Limited Partnership Interest in the Operating Partnership.” Earnings per Unit The Operating Partnership's earnings per unit for the three and six months ended June 30, 2015 and 2014 are computed as follows (in thousands): Three Months Ended June 30, Six Months Ended June 30, Numerator 2015 2014 2015 2014 Basic and Diluted Earnings: (Loss) income attributable to SLGOP common unitholders $ (40,683 ) $ 244,186 $ 4,337 $ 395,005 Three Months Ended June 30, Six Months Ended June 30, Denominator 2015 2014 2015 2014 Basic units: Weighted average common units outstanding 103,487 98,970 102,930 98,627 Effect of Dilutive Securities: Stock-based compensation plans — 514 493 501 Diluted weighted average common units outstanding 103,487 99,484 103,423 99,128 The Operating Partnership has excluded 228,122 , 212,317 , 748,000 and 797,000 common unit equivalents from the diluted units outstanding for the three and six months ended June 30, 2015 and 2014, respectively, as they were anti-dilutive. Additionally, SLGOP has excluded 459,216 from the diluted shares outstanding for three months ended June 30, 2015 as they were anti-dilutive as a result of the net loss attributable to SLGOP common unitholders. Accumulated Other Comprehensive Loss of the Operating Partnership The following tables set forth the changes in accumulated other comprehensive income (loss) by component as of June 30, 2015 (in thousands): Net unrealized (loss) gain on derivative instruments ( 1 ) SLGOP’s share of joint venture net unrealized (loss) gain on derivative instruments ( 2 ) Unrealized gain and (loss) on marketable securities Total Balance at December 31, 2014 $ (9,845 ) $ (100 ) $ 2,689 $ (7,256 ) Other comprehensive loss before reclassifications (8,616 ) (960 ) (654 ) (10,230 ) Amounts reclassified from accumulated other comprehensive income 5,484 662 — 6,146 Balance at June 30, 2015 $ (12,977 ) $ (398 ) $ 2,035 $ (11,340 ) ____________________________________________________________________ (1) Amount reclassified from accumulated other comprehensive income (loss) is included in interest expense in the respective consolidated statements of operations. As of June 30, 2015 and December 31, 2014, the deferred net losses from these terminated hedges, which is included in accumulated other comprehensive loss relating to net unrealized loss on derivative instrument, was $11.2 million and $12.2 million , respectively. (2) Amount reclassified from accumulated other comprehensive income (loss) is included in equity in net income from unconsolidated joint ventures in the respective consolidated statements of operations.

Share-based Compensation

Share-based Compensation	6 Months Ended
	Jun. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Share-based Compensation	Share-based Compensation We have stock-based employee and director compensation plans. Our employees are compensated through the Operating Partnership. Under each plan, whenever the Company issues common or preferred stock, the Operating Partnership issues an equivalent number of units of limited partnership interest of a corresponding class to the Company. Third Amended and Restated 2005 Stock Option and Incentive Plan The Third Amended and Restated 2005 Stock Option and Incentive Plan, or the 2005 Plan, was approved by the Company's board of directors in April 2013 and its stockholders in June 2013 at the Company's annual meeting of stockholders. The 2005 Plan authorizes the issuance of stock options, stock appreciation rights, unrestricted and restricted stock, phantom shares, dividend equivalent rights and other equity-based awards. Subject to adjustments upon certain corporate transactions or events, awards with respect to up to a maximum of 17,130,000 fungible units may be granted under the 2005 Plan. Currently, different types of awards count against the limit on the number of fungible units differently, with (1) full-value awards (i.e., those that deliver the full value of the award upon vesting, such as restricted stock) counting as 2.76 fungible units per share subject to such award (2) stock options, stock appreciation rights and other awards that do not deliver full value and expire five years from the date of grant counting as 0.77 fungible units per share subject to such award and (3) all other awards (e.g., ten -year stock options) counting as 1.0 fungible units per share subject to such award. Awards granted under the 2005 Plan prior to the approval of the second amendment and restatement in June 2010 and third amendment and restatement in June 2013 continue to count against the fungible unit limit based on the ratios that were in effect at the time such awards were granted, which may be different than the current ratios. As a result, depending on the types of awards issued, the 2005 Plan may result in the issuance of more or less than 17,130,000 shares. If a stock option or other award granted under the 2005 Plan expires or terminates, the common stock subject to any portion of the award that expires or terminates without having been exercised or paid, as the case may be, will again become available for the issuance of additional awards. Shares of SL Green's common stock distributed under the 2005 Plan may be treasury shares or authorized but unissued shares. Currently, unless the 2005 Plan has been previously terminated by the Company's board of directors, new awards may be granted under the 2005 Plan until June 13, 2023, which is the tenth anniversary of the date that the 2005 Plan was most recently approved by the Company's stockholders. As of June 30, 2015 , 1.7 million fungible units were available for issuance under the 2005 Plan after reserving for shares underlying outstanding restricted stock units, phantom stock units granted pursuant to our Non-Employee Directors' Deferral Program and LTIP Units, including, among others, outstanding LTIP Units issued under our 2011 Long-Term Outperformance Plan. Options are granted under the plan at the fair market value on the date of grant and, subject to employment, generally expire five or ten years from the date of grant, are not transferable other than on death, and generally vest in one to five years commencing one year from the date of grant. The fair value of each stock option granted is estimated on the date of grant using the Black-Scholes option pricing model based on historical information with the following weighted average assumptions for grants during the six months ended June 30, 2015 and year ended December 31, 2014 . June 30, 2015 December 31, 2014 Dividend yield 1.60 % 1.60 % Expected life of option 3.5 years 3.6 years Risk-free interest rate 1.02 % 1.29 % Expected stock price volatility 34.00 % 33.97 % A summary of the status of the Company's stock options as of June 30, 2015 and December 31, 2014 and changes during the six months ended June 30, 2015 and the year ended December 31, 2014 are as follows: June 30, 2015 December 31, 2014 Options Outstanding Weighted Average Exercise Price Options Outstanding Weighted Average Exercise Price Balance at beginning of year 1,462,726 $ 87.98 1,765,034 $ 83.24 Granted 12,000 128.82 102,050 119.12 Exercised (154,836 ) 75.43 (348,156 ) 72.76 Lapsed or cancelled (18,767 ) 100.67 (56,202 ) 90.03 Balance at end of year 1,301,123 $ 89.66 1,462,726 $ 87.98 Options exercisable at end of year 606,157 $ 88.15 428,951 $ 90.32 Weighted average fair value of options granted during the year $ 356,288 $ 2,841,678 All options were granted with strike prices ranging from $20.67 to $137.18 . The remaining weighted average contractual life of the options outstanding was 3.75 and the remaining average contractual life of the options exercisable was 3.56 . During the three and six months ended June 30, 2015 and 2014, we recognized $1.9 million , $3.9 million . $2.0 million and $4.1 million of compensation expense, respectively, for these options. As of June 30, 2015 , there was $10.1 million of total unrecognized compensation cost related to unvested stock options, which is expected to be recognized over a weighted average period of three years. Stock-based Compensation Effective January 1, 1999, the Company implemented a deferred compensation plan, or the Deferred Plan, where shares issued under the Deferred Plan were granted to certain employees, including our executives and vesting will occur annually upon the completion of a service period or our meeting established financial performance criteria. Annual vesting occurs at rates ranging from 15% to 35% once performance criteria are reached. A summary of the Company's restricted stock as of June 30, 2015 and December 31, 2014 and charges during the six months ended June 30, 2015 and the year ended December 31, 2014 are as follows: June 30, 2015 December 31, 2014 Balance at beginning of period 3,000,979 2,994,197 Granted 3,053 9,550 Cancelled (2,900 ) (2,768 ) Balance at end of period 3,001,132 3,000,979 Vested during the period 84,581 75,043 Compensation expense recorded $ 3,812,029 $ 9,658,019 Weighted average fair value of restricted stock granted during the period $ 391,271 $ 1,141,675 The fair value of restricted stock that vested during the six months ended June 30, 2015 and the year ended December 31, 2014 was $7.2 million and $5.5 million , respectively. As of June 30, 2015 , there was $8.7 million of total unrecognized compensation cost related to unvested restricted stock, which is expected to be recognized over a weighted average period of 1.7 years . For the three and six months ended June 30, 2015 and 2014, $1.8 million , $3.4 million , $1.9 million and $3.5 million , respectively, was capitalized to assets associated with compensation expense related to our long-term compensation plans, restricted stock and stock options. We granted LTIP Units, which include bonus, time-based and performance based awards, with a fair valu e of $25.4 million and $33.2 million as of June 30, 2015 and December 31, 2014, respectively. The grant date fair value of the LTIP Unit awards was calculated in accordance with ASC 718. A third party consultant determined the fair value of the LTIP Units to have a discount from SL Green's common stock price. The discount was calculated by considering the inherent uncertainty that the LTIP Units will reach parity with other common partnership units and the illiquidity due to transfer restrictions. As of June 30, 2015 , there was $7.3 million of total unrecognized compensation expense related to the time-based and performance based awards, which is expected to be recognized over a weighted average period of 1.0 year . During the three and six months ended June 30, 2015 and 2014 , we recorded compensation expense related to bonus, time-based and performance based awards of $3.1 million , $16.3 million , $2.1 million and $10.3 million , respectively. 2010 Notional Unit Long-Term Compensation Plan In December 2009, the compensation committee of the Company's board of directors approved the general terms of the SL Green Realty Corp. 2010 Notional Unit Long-Term Compensation Program, or the 2010 Long-Term Compensation Plan. The 2010 Long-Term Compensation Plan is a long-term incentive compensation plan pursuant to which award recipients could earn, in the aggregate, from $15.0 million up to $75.0 million of LTIP Units in the Operating Partnership based on the Company's stock price appreciation over three years beginning on December 1, 2009; provided that, if maximum performance had been achieved, $25.0 million of awards could be earned at any time after the beginning of the second year and an additional $25.0 million of awards could be earned at any time after the beginning of the third year. In order to achieve maximum performance under the 2010 Long-Term Compensation Plan, the Company's aggregate stock price appreciation during the performance period had to equal or exceed 50% . The compensation committee determined that maximum performance had been achieved at or shortly after the beginning of each of the second and third years of the performance period and for the full performance period and, accordingly, 366,815 LTIP Units, 385,583 LTIP Units and 327,416 LTIP Units were earned under the 2010 Long-Term Compensation Plan in December 2010, 2011 and 2012, respectively. Substantially in accordance with the original terms of the program, 50% of these LTIP Units vested on December 17, 2012 (accelerated from the original January 1, 2013 vesting date), 25% of these LTIP Units vested on December 11, 2013 (accelerated from the original January 1, 2014 vesting date) and the remainder vested on January 1, 2015 based on continued employment. In accordance with the terms of the 2010 Long-Term Compensation Plan, distributions were not paid on any LTIP Units until they were earned, at which time we paid all distributions that would have been paid on the earned LTIP Units since the beginning of the performance period. The cost of the 2010 Long-Term Compensation Plan ( $31.7 million , subject to forfeitures) was amortized into earnings through the final vesting period of January 1, 2015. We recorded compensation expense of $1.6 million and $1.9 million during the three and six months ended June 30, 2014 related to the 2010 Long-Term Compensation Plan. 2011 Outperformance Plan In August 2011, the compensation committee of the Company's board of directors approved the general terms of the SL Green Realty Corp. 2011 Outperformance Plan, or the 2011 Outperformance Plan. Participants in the 2011 Outperformance Plan could earn, in the aggregate, up to $85.0 million of LTIP Units in the Operating Partnership based on our total return to stockholders for the three-year period beginning September 1, 2011. Under the 2011 Outperformance Plan, participants were entitled to share in a "performance pool" comprised of LTIP Units with a value equal to 10% of the amount by which our total return to stockholders during the three -year period exceeded a cumulative total return to stockholders of 25% , subject to the maximum of $85.0 million of LTIP Units; provided that if maximum performance was achieved, one-third of each award could be earned at any time after the beginning of the second year and an additional one-third of each award could be earned at any time after the beginning of the third year. LTIP Units earned under the 2011 Outperformance Plan are subject to continued vesting requirements, with 50% of any awards earned vested on August 31, 2014 and the remaining 50% vesting on August 31, 2015, subject to continued employment with us through such dates. Participants were not entitled to distributions with respect to LTIP Units granted under the 2011 Outperformance Plan unless and until they were earned. For LTIP Units that were earned, each participant was also entitled to the distributions that would have been paid had the number of earned LTIP Units been issued at the beginning of the performance period, with such distributions being paid in the form of additional LTIP Units. Thereafter, distributions are to be paid currently with respect to all earned LTIP Units, whether vested or unvested. In June 2014, the compensation committee determined that maximum performance had been achieved during the third year of the performance period and, accordingly, 560,908 LTIP Units, representing two-thirds of each award, were earned, subject to vesting, under the 2011 Outperformance Plan. In September 2014, the compensation committee determined that maximum performance had been achieved for the full three -year performance period and, accordingly, 280,454 LTIP units, representing the final third of each award, were earned, subject to vesting, under the 2011 Outperformance Plan. The cost of the 2011 Outperformance Plan ( $26.8 million , subject to forfeitures) will be amortized into earnings through the final vesting period. We recorded compensation expense of $3.2 million , $3.9 million , $4.3 million and $6.1 million during the three and six months ended June 30, 2015 and 2014, respectively, related to the 2011 Outperformance Plan. 2014 Outperformance Plan In August 2014, the compensation committee of the Company's board of directors approved the general terms of the SL Green Realty Corp. 2014 Outperformance Plan, or the 2014 Outperformance Plan. Participants in the 2014 Outperformance Plan may earn, in the aggregate, up to 610,000 LTIP Units in our Operating Partnership based on our total return to stockholders for the three -year period beginning September 1, 2014. For each individual award, two-thirds of the LTIP Units may be earned based on the Company’s absolute total return to stockholders and one-third of the LTIP Units may be earned based on relative total return to stockholders compared to the constituents of the MSCI REIT Index. Awards earned based on absolute total return to stockholders will be determined independently of awards earned based on relative total return to stockholders. In the event the Company’s performance reaches either threshold before the end of the three -year performance period, a pro-rata portion of the maximum award may be earned. For each component, if the Company’s performance reaches the maximum threshold beginning with the 19th month of the performance period, participants will earn one-third of the maximum award that may be earned for that component. If the Company’s performance reaches the maximum threshold during the third year of the performance period for a component, participants will earn two-thirds (or an additional one-third) of the maximum award that may be earned for that component. LTIP Units earned under the 2014 Outperformance Plan will be subject to continued vesting requirements, with 50% of any awards earned vesting on August 31, 2017 and the remaining 50% vesting on August 31, 2018, subject to continued employment with us through such dates. Participants will not be entitled to distributions with respect to LTIP Units granted under the 2014 Outperformance Plan unless and until they are earned. If LTIP Units are earned, each participant will also be entitled to the distributions that would have been paid had the number of earned LTIP Units been issued at the beginning of the performance period, with such distributions being paid in the form of cash or additional LTIP Units. Thereafter, distributions will be paid currently with respect to all earned LTIP Units, whether vested or unvested. The cost of the 2014 Outperformance Plan ( $27.9 million , subject to forfeitures), based on the portion of the 2014 Outperformance Plan granted as of June 30, 2015 , will be amortized into earnings through the final vesting period. We recorded compensation expense of $ 1.5 million and $2.9 million during the three and six months ended June 30, 2015 related to the 2014 Outperformance Plan. Deferred Compensation Plan for Directors Under our Non-Employee Director's Deferral Program, which commenced July 2004, the Company's non-employee directors may elect to defer up to 100% of their annual retainer fee, chairman fees, meeting fees and annual stock grant. Unless otherwise elected by a participant, fees deferred under the program shall be credited in the form of phantom stock units. The program provides that a director's phantom stock units generally will be settled in an equal number of shares of common stock upon the earlier of (i) the January 1 coincident with or next following such director's termination of service from the Board of Directors or (ii) a change in control by us, as defined by the program. Phantom stock units are credited to each non-employee director quarterly using the closing price of SL Green's common stock on the first business day of the respective quarter. Each participating non-employee director is also credited with dividend equivalents or phantom stock units based on the dividend rate for each quarter, which are either paid in cash currently or credited to the director’s account as additional phantom stock units. During the six months ended June 30, 2015 , 7,941 phantom stock units were earned and 5,396 shares of common stock were issued to our board of directors. We recorded compensation expense of $0.3 million , $1.7 million , $0.1 million and $1.4 million during the three and six months ended June 30, 2015 and 2014 related to the Deferred Compensation Plan. As of June 30, 2015 , there were 83,644 phantom stock units outstanding pursuant to our Non-Employee Director's Deferral Program. Employee Stock Purchase Plan In 2007, the Company's board of directors adopted the 2008 Employee Stock Purchase Plan, or ESPP, to encourage our employees to increase their efforts to make our business more successful by providing equity-based incentives to eligible employees. The ESPP is intended to qualify as an "employee stock purchase plan" under Section 423 of the Code, and has been adopted by the board to enable our eligible employees to purchase the Company's shares of common stock through payroll deductions. The ESPP became effective on January 1, 2008 with a maximum of 500,000 shares of the common stock available for issuance, subject to adjustment upon a merger, reorganization, stock split or other similar corporate change. The Company filed a registration statement on Form S-8 with the SEC with respect to the ESPP. The common stock is offered for purchase through a series of successive offering periods. Each offering period will be three months in duration and will begin on the first day of each calendar quarter, with the first offering period having commenced on January 1, 2008. The ESPP provides for eligible employees to purchase the common stock at a purchase price equal to 85% of the lesser of (1) the market value of the common stock on the first day of the offering period or (2) the market value of the common stock on the last day of the offering period. The ESPP was approved by our stockholders at our 2008 annual meeting of stockholders. As of June 30, 2015 , 83,477 shares of SL Green's common stock had been issued under the ESPP.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Loss of the Company	6 Months Ended
	Jun. 30, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Loss of the Company/Operating Partnership	Stockholders’ Equity of the Company Common Stock Our authorized capital stock consists of 260,000,000 shares, $0.01 par value per share, consisting of 160,000,000 shares of common stock, $0.01 par value per share, 75,000,000 shares of excess stock, at $0.01 par value per share, and 25,000,000 shares of preferred stock, par value $0.01 per share. As of June 30, 2015 , 99,589,645 shares of common stock and no shares of excess stock were issued and outstanding. At-The-Market Equity Offering Program In June 2014, the Company, along with the Operating Partnership, entered into an "at-the-market" equity offering program, or ATM Program, to sell an aggregate of $300.0 million of SL Green's common stock. During the three months ended March 31, 2015, we sold 895,956 shares of our common stock for aggregate net proceeds of $113.4 million comprising the remaining balance of this ATM Program. The net proceeds from these offerings were contributed to the Operating Partnership in exchange for 895,956 units of limited partnership interest of the Operating Partnership. In March 2015, the Company, along with the Operating Partnership, entered into a new ATM Program to sell an aggregate of $300.0 million of SL Green's common stock. During the six months ended June 30, 2015 , we sold 91,180 shares of our common stock for aggregate net proceeds of $12.0 million . The net proceeds from these offerings were contributed to the Operating Partnership in exchange for 91,180 units of limited partnership interest of the Operating Partnership. As of June 30, 2015 , $288.0 million remained available for issuance of common stock under the new ATM program. Perpetual Preferred Stock We have 9,200,000 shares of our 6.50% Series I Cumulative Redeemable Preferred Stock, or the Series I Preferred Stock, outstanding with a mandatory liquidation preference of $25.00 per share. The Series I Preferred stockholders receive annual dividends of $1.625 per share paid on a quarterly basis and dividends are cumulative, subject to certain provisions. We are entitled to redeem the Series I Preferred Stock at par for cash at our option on or after August 10, 2017. In August 2012, we received $221.9 million in net proceeds from the issuance of the Series I Preferred Stock, which were recorded net of underwriters' discount and issuance costs, and contributed the net proceeds to the Operating Partnership in exchange for 9,200,000 units of 6.50% Series I Cumulative Redeemable Preferred Units of limited partnership interest, or the Series I Preferred Units. Dividend Reinvestment and Stock Purchase Plan In February 2015, the Company filed a registration statement with the SEC for our dividend reinvestment and stock purchase plan, or DRSPP, which automatically became effective upon filing. The Company registered 3,500,000 shares of SL Green's common stock under the DRSPP. The DRSPP commenced on September 24, 2001. During the six months ended June 30, 2015 , the Company issued 775,316 shares of SL Green's common stock and received net proceeds of $99.5 million of proceeds from dividend reinvestments and/or stock purchases under the DRSPP. DRSPP shares may be issued at a discount to the market price. Earnings per Share SL Green's earnings per share for the three and six months ended June 30, 2015 and 2014 are computed as follows (in thousands): Three Months Ended June 30, Six Months Ended June 30, Numerator 2015 2014 2015 2014 Basic Earnings: (Loss) income attributable to SL Green common stockholders $ (39,106 ) $ 235,541 $ 4,171 $ 381,631 Effect of Dilutive Securities: Redemption of units to common shares — 8,645 166 13,374 Diluted Earnings: (Loss) income attributable to SL Green common stockholders $ (39,106 ) $ 244,186 $ 4,337 $ 395,005 Three Months Ended June 30, Six Months Ended June 30, Denominator 2015 2014 2015 2014 Basic Shares: Weighted average common stock outstanding 99,579 95,455 98,994 95,288 Effect of Dilutive Securities: Redemption of units to common shares — 3,515 3,936 3,339 Stock-based compensation plans — 514 493 501 Diluted weighted average common stock outstanding 99,579 99,484 103,423 99,128 SL Green has excluded 228,122 , 212,317 , 748,000 and 797,000 common stock equivalents from the diluted shares outstanding for the three and six months ended June 30, 2015 and 2014, respectively, as they were anti-dilutive. Additionally, SL Green has excluded 4,367,272 from the diluted shares outstanding for three months ended June 30, 2015 as they were anti-dilutive as a result of the net loss attributable to SL Green common stockholders.
SL Green Realty Corp
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Loss of the Company/Operating Partnership	Accumulated Other Comprehensive Loss of the Company The following tables set forth the changes in accumulated other comprehensive income (loss) by component as of June 30, 2015 (in thousands): Net unrealized (loss) gain on derivative instruments ( 1 ) SL Green’s share of joint venture net unrealized (loss) gain on derivative instruments ( 2 ) Unrealized gain and (loss) on marketable securities Total Balance at December 31, 2014 $ (9,498 ) $ (95 ) $ 2,613 $ (6,980 ) Other comprehensive loss before reclassifications (8,258 ) (926 ) (654 ) (9,838 ) Amounts reclassified from accumulated other comprehensive income 5,275 637 — 5,912 Balance at June 30, 2015 $ (12,481 ) $ (384 ) $ 1,959 $ (10,906 ) ____________________________________________________________________ (1) Amount reclassified from accumulated other comprehensive income (loss) is included in interest expense in the respective consolidated statements of operations. As of June 30, 2015 and December 31, 2014 , the deferred net losses from these terminated hedges, which is included in accumulated other comprehensive loss relating to net unrealized loss on derivative instrument, was $10.8 million and $11.8 million , respectively. (2) Amount reclassified from accumulated other comprehensive income (loss) is included in equity in net income from unconsolidated joint ventures in the respective consolidated statements of operations.

Accumulated Other Comprehensi27

Accumulated Other Comprehensive Loss of the Operating Partnership	6 Months Ended
	Jun. 30, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Loss of the Company/Operating Partnership	Stockholders’ Equity of the Company Common Stock Our authorized capital stock consists of 260,000,000 shares, $0.01 par value per share, consisting of 160,000,000 shares of common stock, $0.01 par value per share, 75,000,000 shares of excess stock, at $0.01 par value per share, and 25,000,000 shares of preferred stock, par value $0.01 per share. As of June 30, 2015 , 99,589,645 shares of common stock and no shares of excess stock were issued and outstanding. At-The-Market Equity Offering Program In June 2014, the Company, along with the Operating Partnership, entered into an "at-the-market" equity offering program, or ATM Program, to sell an aggregate of $300.0 million of SL Green's common stock. During the three months ended March 31, 2015, we sold 895,956 shares of our common stock for aggregate net proceeds of $113.4 million comprising the remaining balance of this ATM Program. The net proceeds from these offerings were contributed to the Operating Partnership in exchange for 895,956 units of limited partnership interest of the Operating Partnership. In March 2015, the Company, along with the Operating Partnership, entered into a new ATM Program to sell an aggregate of $300.0 million of SL Green's common stock. During the six months ended June 30, 2015 , we sold 91,180 shares of our common stock for aggregate net proceeds of $12.0 million . The net proceeds from these offerings were contributed to the Operating Partnership in exchange for 91,180 units of limited partnership interest of the Operating Partnership. As of June 30, 2015 , $288.0 million remained available for issuance of common stock under the new ATM program. Perpetual Preferred Stock We have 9,200,000 shares of our 6.50% Series I Cumulative Redeemable Preferred Stock, or the Series I Preferred Stock, outstanding with a mandatory liquidation preference of $25.00 per share. The Series I Preferred stockholders receive annual dividends of $1.625 per share paid on a quarterly basis and dividends are cumulative, subject to certain provisions. We are entitled to redeem the Series I Preferred Stock at par for cash at our option on or after August 10, 2017. In August 2012, we received $221.9 million in net proceeds from the issuance of the Series I Preferred Stock, which were recorded net of underwriters' discount and issuance costs, and contributed the net proceeds to the Operating Partnership in exchange for 9,200,000 units of 6.50% Series I Cumulative Redeemable Preferred Units of limited partnership interest, or the Series I Preferred Units. Dividend Reinvestment and Stock Purchase Plan In February 2015, the Company filed a registration statement with the SEC for our dividend reinvestment and stock purchase plan, or DRSPP, which automatically became effective upon filing. The Company registered 3,500,000 shares of SL Green's common stock under the DRSPP. The DRSPP commenced on September 24, 2001. During the six months ended June 30, 2015 , the Company issued 775,316 shares of SL Green's common stock and received net proceeds of $99.5 million of proceeds from dividend reinvestments and/or stock purchases under the DRSPP. DRSPP shares may be issued at a discount to the market price. Earnings per Share SL Green's earnings per share for the three and six months ended June 30, 2015 and 2014 are computed as follows (in thousands): Three Months Ended June 30, Six Months Ended June 30, Numerator 2015 2014 2015 2014 Basic Earnings: (Loss) income attributable to SL Green common stockholders $ (39,106 ) $ 235,541 $ 4,171 $ 381,631 Effect of Dilutive Securities: Redemption of units to common shares — 8,645 166 13,374 Diluted Earnings: (Loss) income attributable to SL Green common stockholders $ (39,106 ) $ 244,186 $ 4,337 $ 395,005 Three Months Ended June 30, Six Months Ended June 30, Denominator 2015 2014 2015 2014 Basic Shares: Weighted average common stock outstanding 99,579 95,455 98,994 95,288 Effect of Dilutive Securities: Redemption of units to common shares — 3,515 3,936 3,339 Stock-based compensation plans — 514 493 501 Diluted weighted average common stock outstanding 99,579 99,484 103,423 99,128 SL Green has excluded 228,122 , 212,317 , 748,000 and 797,000 common stock equivalents from the diluted shares outstanding for the three and six months ended June 30, 2015 and 2014, respectively, as they were anti-dilutive. Additionally, SL Green has excluded 4,367,272 from the diluted shares outstanding for three months ended June 30, 2015 as they were anti-dilutive as a result of the net loss attributable to SL Green common stockholders.
SL Green Operating Partnership
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Loss of the Company/Operating Partnership	Partners' Capital of the Operating Partnership The Company is the sole general partner of the Operating Partnership and at June 30, 2015 owned 99,589,645 general and limited partnership interests in the Operating Partnership and 9,200,000 Series I Preferred Units. Partnership interests in the Operating Partnership are denominated as “common units of limited partnership interest” (also referred to as “OP Units”) or “preferred units of limited partnership interest” (also referred to as “Preferred Units”). All references to OP Units and Preferred Units outstanding exclude such units held by the Company. A holder of an OP Unit may present such OP Unit to the Operating Partnership for redemption at any time (subject to restrictions agreed upon at the issuance of OP Units to particular holders that may restrict such right for a period of time, generally one year from issuance). Upon presentation of an OP Unit for redemption, the Operating Partnership must redeem such OP Unit in exchange for the cash equal to the then value of a share of common stock of the Company, except that the Company may, at its election, in lieu of cash redemption, acquire such OP Unit for one share of common stock. Because the number of shares of common stock outstanding at all times equals the number of OP Units that the Company owns, one share of common stock is generally the economic equivalent of one OP Unit, and the quarterly distribution that may be paid to the holder of an OP Unit equals the quarterly dividend that may be paid to the holder of a share of common stock. Each series of Preferred Units makes a distribution that is set in accordance with an amendment to the partnership agreement of the Operating Partnership. Preferred Units may also be convertible into OP Units at the election of the holder thereof or the Company, subject to the terms of such Preferred Units. Net income (loss) allocated to the preferred unitholders and common unitholders reflects their pro rata share of net income (loss) and distributions. Limited Partner Units As of June 30, 2015 , limited partners other than SL Green owned 3.78% , or 3,907,117 common units, of the Operating Partnership. Preferred Units Preferred units not owned by SL Green are further described in Note 11, “Noncontrolling Interests on the Company’s Consolidated Financial Statements - Preferred Units of Limited Partnership Interest in the Operating Partnership.” Earnings per Unit The Operating Partnership's earnings per unit for the three and six months ended June 30, 2015 and 2014 are computed as follows (in thousands): Three Months Ended June 30, Six Months Ended June 30, Numerator 2015 2014 2015 2014 Basic and Diluted Earnings: (Loss) income attributable to SLGOP common unitholders $ (40,683 ) $ 244,186 $ 4,337 $ 395,005 Three Months Ended June 30, Six Months Ended June 30, Denominator 2015 2014 2015 2014 Basic units: Weighted average common units outstanding 103,487 98,970 102,930 98,627 Effect of Dilutive Securities: Stock-based compensation plans — 514 493 501 Diluted weighted average common units outstanding 103,487 99,484 103,423 99,128 The Operating Partnership has excluded 228,122 , 212,317 , 748,000 and 797,000 common unit equivalents from the diluted units outstanding for the three and six months ended June 30, 2015 and 2014, respectively, as they were anti-dilutive. Additionally, SLGOP has excluded 459,216 from the diluted shares outstanding for three months ended June 30, 2015 as they were anti-dilutive as a result of the net loss attributable to SLGOP common unitholders. Accumulated Other Comprehensive Loss of the Operating Partnership The following tables set forth the changes in accumulated other comprehensive income (loss) by component as of June 30, 2015 (in thousands): Net unrealized (loss) gain on derivative instruments ( 1 ) SLGOP’s share of joint venture net unrealized (loss) gain on derivative instruments ( 2 ) Unrealized gain and (loss) on marketable securities Total Balance at December 31, 2014 $ (9,845 ) $ (100 ) $ 2,689 $ (7,256 ) Other comprehensive loss before reclassifications (8,616 ) (960 ) (654 ) (10,230 ) Amounts reclassified from accumulated other comprehensive income 5,484 662 — 6,146 Balance at June 30, 2015 $ (12,977 ) $ (398 ) $ 2,035 $ (11,340 ) ____________________________________________________________________ (1) Amount reclassified from accumulated other comprehensive income (loss) is included in interest expense in the respective consolidated statements of operations. As of June 30, 2015 and December 31, 2014, the deferred net losses from these terminated hedges, which is included in accumulated other comprehensive loss relating to net unrealized loss on derivative instrument, was $11.2 million and $12.2 million , respectively. (2) Amount reclassified from accumulated other comprehensive income (loss) is included in equity in net income from unconsolidated joint ventures in the respective consolidated statements of operations.

Fair Value Measurements

Fair Value Measurements	6 Months Ended
	Jun. 30, 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. The following tables set forth the assets and liabilities that we measure at fair value on a recurring and non-recurring basis by their levels in the fair value hierarchy at June 30, 2015 and December 31, 2014 (in thousands): June 30, 2015 Total Level 1 Level 2 Level 3 Assets: Marketable securities $ 46,251 $ 4,070 $ 42,181 $ — Interest rate swap agreements (included in other assets) $ 23 $ — $ 23 $ — Liabilities: Interest rate swap agreements (included in accrued interest payable and other liabilities) $ 14,576 $ — $ 14,576 $ — December 31, 2014 Total Level 1 Level 2 Level 3 Assets: Marketable securities $ 39,429 $ 4,332 $ 35,097 $ — Interest rate swap agreements (included in other assets) $ 2,174 $ — $ 2,174 $ — Liabilities: Interest rate swap agreements (included in accrued interest payable and other liabilities) $ 14,728 $ — $ 14,728 $ — We determine other than temporary impairment in real estate investments and debt and preferred equity investments, including intangibles utilizing cash flow projections that apply, among other things, estimated revenue and expense growth rates, discount rates and capitalization rates, which are classified as Level 3 inputs. The marketable securities classified as Level 1 were derived from quoted prices in active markets. The valuation technique used to measure the fair value of the marketable securities classified as Level 2 were valued based on quoted market prices or model driven valuations using the significant inputs derived from or corroborated by observable market data. Marketable securities in an unrealized loss position are not considered to be other than temporarily impaired. We do not intend to sell these securities and it is not more likely than not that we will be required to sell the investments before recovery of their amortized cost bases. The fair value of derivative instruments is based on current market data received from financial sources that trade such instruments and are based on prevailing market data and derived from third party proprietary models based on well-recognized financial principles and reasonable estimates about relevant future market conditions, which are classified as Level 2 inputs. The financial assets and liabilities that are not measured at fair value on our consolidated balance sheets include cash and cash equivalents, restricted cash, accounts receivable, accounts payable and accrued expenses, debt and preferred equity investments, mortgages and other loans payable and other secured and unsecured debt. The carrying amount of cash and cash equivalents, restricted cash, accounts receivable, and accounts payable and accrued expenses reported in our consolidated balance sheets approximates fair value due to the short term nature of these instruments. The fair value of debt and preferred equity investments, which is classified as Level 3, is estimated by discounting the future cash flows using current interest rates at which similar loans with the same maturities would be made to borrowers with similar credit ratings. The fair value of borrowings, which is classified as Level 3, is estimated by discounting the contractual cash flows of each debt to their present value using adjusted market interest rates, which is provided by a third-party specialist. The following table provides the carrying value and fair value of these financial instruments as of June 30, 2015 and December 31, 2014 (in thousands): June 30, 2015 December 31, 2014 Carrying Value Fair Value Carrying Value Fair Value Debt and preferred equity investments $ 1,685,234 (1) $ 1,408,804 (1) Fixed rate debt $ 6,011,563 $ 6,419,286 $ 6,140,786 $ 6,565,236 Variable rate debt 2,364,421 2,412,488 2,291,943 2,315,952 $ 8,375,984 $ 8,831,774 $ 8,432,729 $ 8,881,188 ____________________________________________________________________ (1) At June 30, 2015 , debt and preferred equity investments had an estimated fair value ranging between $1.9 billion and $2.1 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 June 30, 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	6 Months Ended
	Jun. 30, 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 equity may increase or decrease prospectively, depending on future levels of interest rates and other variables affecting the fair values of derivative instruments and hedged items, but will have no effect on cash flows. Currently, all of our designated derivative instruments are effective hedging instruments. The following table summarizes the notional and fair value of our consolidated derivative financial instruments at June 30, 2015 based on Level 2 information. The notional value is an indication of the extent of our involvement in these instruments at that time, but does not represent exposure to credit, interest rate or market risks (amounts in thousands). Notional Value Strike Rate Effective Date Expiration Date Balance Sheet Location Fair Value Interest Rate Cap - Sold $ 504,000 4.750 % May 2014 May 2016 Other Liabilities $ — Interest Rate Cap 504,000 4.750 % May 2014 May 2016 Other Assets — Interest Rate Cap 500,000 4.750 % October 2014 May 2016 Other Liabilities — Interest Rate Cap - Sold 500,000 4.750 % November 2014 May 2016 Other Assets — Interest Rate Cap 446,000 4.750 % October 2014 May 2016 Other Liabilities — Interest Rate Cap 263,426 6.000 % November 2013 November 2015 Other Liabilities — Interest Rate Cap 137,500 4.000 % October 2013 September 2015 Other Liabilities — Interest Rate Swap 200,000 0.938 % October 2014 December 2017 Other Liabilities (133 ) Interest Rate Swap 150,000 0.940 % October 2014 December 2017 Other Liabilities (103 ) Interest Rate Swap 150,000 0.940 % October 2014 December 2017 Other Liabilities (103 ) Interest Rate Swap 144,000 2.236 % December 2012 December 2017 Other Liabilities (4,541 ) Interest Rate Swap 86,400 1.948 % December 2012 December 2017 Other Liabilities (2,123 ) Interest Rate Swap 72,000 2.310 % December 2012 December 2017 Other Liabilities (2,399 ) Interest Rate Swap 72,000 1.345 % December 2012 December 2017 Other Liabilities (725 ) Interest Rate Swap 72,000 2.310 % December 2012 December 2017 Other Liabilities (2,398 ) Interest Rate Swap 57,600 1.990 % December 2012 December 2017 Other Liabilities (1,474 ) Interest Rate Swap 30,000 2.295 % July 2010 June 2016 Other Liabilities (548 ) Interest Rate Swap 14,409 0.500 % January 2015 January 2017 Other Assets 23 Interest Rate Swap 8,018 0.852 % February 2015 February 2017 Other Liabilities (29 ) $ (14,553 ) During the three and six months ended June 30, 2015 , we recorded a gain on the changes in the fair value of $1,000 , which is included in interest expense on the consolidated statements of operations. During the three and six months ended June 30, 2014 , we recorded a loss on the changes in the fair value of $31,000 and $41,000 , respectively, which is included in interest expense on the consolidated statements of operations. The Company has agreements with each of its derivative counterparties that contain a provision where if the Company either defaults or is capable of being declared in default on any of its indebtedness, then the Company could also be declared in default on its derivative obligations. As of June 30, 2015 , the fair value of derivatives in a net liability position including accrued interest but excluding any adjustment for nonperformance risk related to these agreements was $15.5 million . As of June 30, 2015 , the Company has not posted any collateral related to these agreements and was not in breach of any agreement provisions. If the Company had breached any of these provisions, it could have been required to settle its obligations under the agreements at their aggregate termination value of $15.5 million at June 30, 2015 . 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 mortgage obligation. Over time, the realized and unrealized gains and losses held in accumulated other comprehensive loss will be reclassified into earnings as an adjustment to interest expense in the same periods in which the hedged interest payments affect earnings. We estimate that $8.7 million of the current balance held in accumulated other comprehensive loss will be reclassified into interest expense and $1.1 million of the portion related to our share of joint venture accumulated other comprehensive loss will be reclassified into equity in net income from unconsolidated joint ventures within the next 12 months. The following table presents the effect of our derivative financial instruments and our share of our joint ventures' derivative financial instruments that are designated and qualify as hedging instruments on the consolidated statements of operations for the three months ended June 30, 2015 and 2014, respectively (in thousands): Amount of (Loss) Gain Recognized in Other Comprehensive Loss (Effective Portion) Location of (Loss) Reclassified from Accumulated Other Comprehensive Loss into Income Amount of Loss Reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion) Location of (Loss) or Gain Recognized in Income on Derivative Amount of (Loss) or Gain Recognized into Income (Ineffective Portion) Three Months Ended June 30, Three Months Ended June 30, Three Months Ended June 30, Derivative 2015 2014 2015 2014 2015 2014 Interest Rate Swaps/Caps $ (1,095 ) $ (465 ) Interest expense $ 2,737 $ 1,272 Interest expense $ (14 ) $ 1 Share of unconsolidated joint ventures' derivative instruments 277 5,930 Equity in net income from unconsolidated joint ventures 331 556 Equity in net income from unconsolidated joint ventures 16 — $ (818 ) $ 5,465 $ 3,068 $ 1,828 $ 2 $ 1 The following table presents the effect of our derivative financial instruments and our share of our joint ventures' derivative financial instruments that are designated and qualify as hedging instruments on the consolidated statements of operations for the six months ended June 30, 2015 and 2014, respectively (in thousands): Amount of (Loss) or Gain Location of(Loss) Reclassified from Accumulated Other Comprehensive Loss into Income Amount of Loss Location of (Loss) or Gain Recognized in Income on Derivative Amount of (Loss) or Gain Six Months Ended Six Months Ended Six Months Ended Derivative 2015 2014 2015 2014 2015 2014 Interest Rate Swaps/Caps $ (8,616 ) $ (516 ) Interest expense $ 5,484 $ 1,964 Interest expense $ (424 ) $ 2 Share of unconsolidated joint ventures' derivative instruments (960 ) 4,184 Equity in net income from unconsolidated joint ventures 662 1,829 Equity in net income from unconsolidated joint ventures — — $ (9,576 ) $ 3,668 $ 6,146 $ 3,793 $ (424 ) $ 2

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2015
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Legal Proceedings As of June 30, 2015 , the Company and the Operating Partnership were not involved in any material litigation nor, to management's knowledge, was any material litigation threatened against us or our portfolio which if adversely determined could have a material adverse impact on us 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. Real Estate Purchase Commitment In May 2015, we entered into an agreement to acquire Eleven Madison Avenue for $2.285 billion plus approximately $300.0 million in costs associated with lease stipulated improvements to the property. The transaction is expected to close in the third quarter of 2015, subject to customary closing conditions. Capital and Ground Leases Arrangements The following is a schedule of future minimum lease payments under capital leases and non-cancellable operating leases with initial terms in excess of one year as of June 30, 2015 (in thousands): Capital lease Non-cancellable operating leases Remaining 2015 $ 73 $ 15,247 2016 170 30,612 2017 291 30,845 2018 291 30,845 2019 315 30,862 Thereafter 56,568 720,698 Total minimum lease payments 57,708 $ 859,109 Less amount representing interest (36,695 ) Capital lease obligations $ 21,013

Segment Information

Segment Information	6 Months Ended
	Jun. 30, 2015
Segment Reporting [Abstract]
Segment Information	Segment Information The Company is a REIT engaged in all aspects of property ownership and management including investment, leasing operations, capital improvements, development and redevelopment, financing, construction and maintenance in the New York Metropolitan area and have two reportable segments, real estate and debt and preferred equity. We evaluate real estate performance and allocate resources based on earnings contribution to income from continuing operations. The primary sources of revenue are generated from tenant rents and escalations and reimbursement revenue. Real estate property operating expenses consist primarily of security, maintenance, utility costs, real estate taxes and ground rent expense (at certain applicable properties). See Note 5, "Debt and Preferred Equity Investments," for additional details on our debt and preferred equity investments. Selected results of operations for the three and six months ended June 30, 2015 and 2014, and selected asset information as of June 30, 2015 and December 31, 2014, regarding our operating segments are as follows (in thousands): Real Estate Segment Debt and Preferred Equity Segment Total Company Total revenues Three months ended: June 30, 2015 $ 363,883 $ 45,191 $ 409,074 June 30, 2014 340,918 39,714 380,632 Six months ended: June 30, 2015 $ 718,113 $ 87,260 $ 805,373 June 30, 2014 649,279 93,798 743,077 (Loss) income from continuing operations before equity in net gain on sale of interest in unconsolidated joint venture/real estate and purchase price fair value adjustment Three months ended: June 30, 2015 $ (65,677 ) $ 35,729 $ (29,948 ) June 30, 2014 23,069 33,993 57,062 Six months ended: June 30, 2015 $ (58,918 ) $ 71,196 $ 12,278 June 30, 2014 23,688 79,576 103,264 Total assets As of: June 30, 2015 $ 15,562,297 $ 1,704,661 $ 17,266,958 December 31, 2014 15,671,662 1,424,925 17,096,587 Income from continuing operations represents total revenues less total expenses for the real estate segment and total investment income less allocated interest expense for the debt and preferred equity segment. Interest costs for the debt and preferred equity segment are imputed assuming the portfolio is 100% leveraged by our 2012 revolving credit facility 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 (totaling $23.2 million , $48.7 million , $23.9 million and $47.1 million for the three and six months ended June 30, 2015 and 2014, respectively) to the debt and preferred equity segment since we base performance on the individual segments prior to allocating marketing, general and administrative expenses. All other expenses, except interest, relate entirely to the real estate assets. There were no transactions between the above two segments. The table below reconciles (loss) income from continuing operations to net (loss) income for the three and six months ended June 30, 2015 and 2014 (in thousands): Three Months Ended June 30, Six Months Ended June 30, 2015 2014 2015 2014 (Loss) income from continuing operations before equity in net gain on sale of interest in unconsolidated joint venture/real estate $ (29,948 ) $ 57,062 $ 12,278 $ 103,264 Equity in net gain on sale of interest in unconsolidated joint venture/real estate 769 1,444 769 106,084 Purchase price fair value adjustment — 71,446 — 71,446 (Loss) income from continuing operations (29,179 ) 129,952 13,047 280,794 Net income from discontinued operations — 5,645 427 11,414 Gain on sale of discontinued operations — 114,735 12,983 114,735 Net (loss) income $ (29,179 ) $ 250,332 $ 26,457 $ 406,943

Subsequent Events

Subsequent Events	6 Months Ended
	Jun. 30, 2015
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events In July, the Company expanded its unsecured corporate credit facility by $500.0 million to $2.533 billion . The revolving line of credit portion of the facility, which matures in March 2020, was increased by $400.0 million to $1.6 billion and the term loan portion of the facility, which matures in June 2019, was increased by $100.0 million to $933.0 million . The Operating Partnership has authorized up to 200,000 4.00% Series P Preferred Units of limited partnership interest, or the Series P Preferred Units, with a liquidation preference of $25.00 per unit. In July 2015, the Company issued 200,000 Series P Preferred Units in connection with an acquisition. The Series P Preferred Units can be redeemed at any time at par for cash at the option of the unitholder. The Operating Partnership has authorized up to 268,000 3.50% Series Q Preferred Units of limited partnership interest, or the Series Q Preferred Units, with a liquidation preference of $25.00 per unit. In July 2015, the Company issued 268,000 Series Q Preferred Units in connection with an acquisition. The Series Q Preferred Units can be redeemed at any time at par for cash at the option of the unitholder.

Significant Accounting Polici33

Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 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 debt and preferred equity investments. See Note 5, "Debt and Preferred Equity Investments" and Note 6, "Investments in Unconsolidated Joint Ventures." All significant intercompany balances and transactions have been eliminated. We consolidate a variable interest entity, or VIE, in which we are considered the primary beneficiary. The primary beneficiary is the entity that has (i) the power to direct the activities that most significantly impact the entity's economic performance and (ii) the obligation to absorb losses of the VIE or the right to receive benefits from the VIE that could be significant to the VIE. Included in commercial real estate properties on our consolidated balance sheets as of June 30, 2015 and December 31, 2014 are $199.6 million and $198.4 million , respectively, related to our consolidated VIEs. Included in mortgages and other loans payable on our consolidated balance sheets as of June 30, 2015 and December 31, 2014 are $105.5 million and $106.5 million , respectively, related to our consolidated VIEs. Also, included in assets held for sale and liabilities related to assets held for sale on our consolidated balance sheets as of December 31, 2014 are $445.0 million of commercial real estate and $253.9 million of mortgage related to our consolidated VIEs. A noncontrolling interest in a consolidated subsidiary is defined as the portion of the equity (net assets) in a subsidiary not attributable, directly or indirectly, to us. Noncontrolling interests are required to be presented as a separate component of equity in the consolidated balance sheet and the presentation of net income is modified to present earnings and other comprehensive income attributed to controlling and noncontrolling interests. We assess the accounting treatment for each joint venture and debt and preferred equity investment. This assessment includes a review of each joint venture or limited liability company agreement to determine which party has what rights and whether those rights are protective or participating. For all VIEs, we review such agreements in order to determine which party has the power to direct the activities that most significantly impact the entity's economic performance. In situations where we and our partner approve, among other things, the annual budget, receive a detailed monthly reporting package from us, 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 the requirement of partner approval to sell, finance or refinance the property and the payment of capital expenditures and operating expenditures outside of the approved budget or operating plan.
Investment in Commercial Real Estate Properties	Investment in Commercial Real Estate Properties On a periodic basis, we assess whether there are any indications that the value of our real estate properties may be other than temporarily impaired or that their carrying value may not be recoverable. A property's value is considered impaired if management's estimate of the aggregate future cash flows (undiscounted 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 do not believe that the values of any of our consolidated properties were other than temporarily impaired at June 30, 2015 . 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 their carrying value or fair value less costs to sell. We allocate the purchase price of real estate to land and building (inclusive of tenant improvements) and, if determined to be material, intangibles, such as the value of above- and below-market leases and origination costs associated with the in-place leases. We depreciate the amount allocated to building (inclusive of tenant improvements) over their estimated useful lives, which generally range from three to 40 years . We amortize the amount allocated to the above- and below-market leases over the remaining term of the associated lease, which generally range from one to 14 years, and record it as either an increase (in the case of below-market leases) or a decrease (in the case of above-market leases) to rental income. We amortize the amount allocated to the values associated with in-place leases over the expected term of the associated lease, which generally ranges from one to 14 years. If a tenant vacates its space prior to the contractual termination of the lease and no rental payments are being made on the lease, any unamortized balance of the related intangible will be written off. The tenant improvements and origination costs are amortized as an expense over the remaining life of the lease (or charged against earnings if the lease is terminated prior to its contractual expiration date). We assess fair value of the leases based on estimated cash flow projections that utilize appropriate discount and capitalization rates and available market information. Estimates of future cash flows are based on a number of factors including the historical operating results, known trends, and market/economic conditions that may affect the property. To the extent acquired leases contain fixed rate renewal options that are below-market and determined to be material, we amortize such below-market lease value into rental income over the renewal period.
Fair Value Measurements	Fair Value Measurements We are required to disclose fair value information with regard to our financial instruments, whether or not recognized in the consolidated balance sheets, for which it is practical to estimate fair value. The FASB guidance defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants on the measurement date. We measure and/or disclose the estimated fair value of financial assets and liabilities based on a hierarchy that distinguishes between market participant assumptions based on market data obtained from sources independent of the reporting entity and the reporting entity’s own assumptions about market participant assumptions. This hierarchy 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 marketable securities classified as Level 1 were derived from quoted prices in active markets. The valuation technique used to measure the fair value of the marketable securities classified as Level 2 were valued based on quoted market prices or model driven valuations using the significant inputs derived from or corroborated by observable market data. Marketable securities in an unrealized loss position are not considered to be other than temporarily impaired. We do not intend to sell these securities and it is not more likely than not that we will be required to sell the investments before recovery of their amortized cost bases. The fair value of derivative instruments is based on current market data received from financial sources that trade such instruments and are based on prevailing market data and derived from third party proprietary models based on well-recognized financial principles and reasonable estimates about relevant future market conditions, which are classified as Level 2 inputs. The financial assets and liabilities that are not measured at fair value on our consolidated balance sheets include cash and cash equivalents, restricted cash, accounts receivable, accounts payable and accrued expenses, debt and preferred equity investments, mortgages and other loans payable and other secured and unsecured debt. The carrying amount of cash and cash equivalents, restricted cash, accounts receivable, and accounts payable and accrued expenses reported in our consolidated balance sheets approximates fair value due to the short term nature of these instruments. The fair value of debt and preferred equity investments, which is classified as Level 3, is estimated by discounting the future cash flows using current interest rates at which similar loans with the same maturities would be made to borrowers with similar credit ratings. The fair value of borrowings, which is classified as Level 3, is estimated by discounting the contractual cash flows of each debt to their present value using adjusted market interest rates, which is provided by a third-party specialist.
Investment in Marketable Securities	Investment in Marketable Securities We designate a security as held-to-maturity, available-for-sale, or trading at acquisition. As of June 30, 2015 , we do not have any securities designated as held-to-maturity or trading. We account for our available-for-sale securities at fair value pursuant to ASC 820-10, with the net unrealized gains or losses reported as a component of accumulated other comprehensive income or loss. Any unrealized losses that are determined to be other-than-temporary are recognized in earnings up to their credit component. The cost of bonds and marketable securities sold is determined using the specific identification method.
Investments in Unconsolidated Joint Ventures	Investments in Unconsolidated Joint Ventures We assess our investments in unconsolidated joint ventures for recoverability, and if it is determined that a loss in value of the investment is other than temporary, we write down the investment to its fair value. We evaluate our equity investments for impairment based on the joint venture's projected discounted cash flows. We do not believe that the values of any of our equity investments were impaired at June 30, 2015 . We may originate loans for real estate acquisition, development and construction, where we expect to receive some or all of the residual profit from such projects. When the risk and rewards of these arrangements are essentially the same as an investor or joint venture partner, we account for these arrangements as real estate investments under the equity method of accounting for investments. Otherwise, we account for these arrangements consistent with our loan accounting for our debt and preferred equity investments.
Revenue Recognition	Revenue Recognition Rental revenue is recognized on a straight-line basis over the term of the lease. Rental revenue recognition commences when the tenant takes possession or controls the physical use of the leased space. In order for the tenant to take possession, the leased space must be substantially ready for its intended use. To determine whether the leased space is substantially ready for its intended use, management evaluates whether we are or the tenant is the owner of tenant improvements for accounting purposes. When management concludes that we are the owner of tenant improvements, rental revenue recognition begins when the tenant takes possession of the finished space, which is when such tenant improvements are substantially complete. In certain instances, when management concludes that we are not the owner (the tenant is the owner) of tenant improvements, rental revenue recognition begins when the tenant takes possession of or controls the space. When management concludes that we are the owner of tenant improvements for accounting purposes, we record amounts funded to construct the tenant improvements as a capital asset. For these tenant improvements, we record amounts reimbursed by tenants as a reduction of the capital asset. When management concludes that the tenant is the owner of tenant improvements for accounting purposes, we record our contribution towards those improvements as a lease incentive, which is included in deferred costs, net on our consolidated balance sheets and amortized as a reduction to rental revenue on a straight-line basis over the term of the lease. The excess of rents recognized over amounts contractually due pursuant to the underlying leases are included in deferred rents receivable on the consolidated balance sheets. We establish, on a current basis, an allowance for future potential tenant credit losses, which may occur against this account. The balance reflected on the consolidated balance sheets is net of such allowance. In addition to base rent, our tenants also generally will pay their pro rata share of increases in real estate taxes and operating expenses for the building over a base year. In some leases, in lieu of paying additional rent based upon increases in building operating expenses, the tenant will pay additional rent based upon increases in the wage rate paid to porters over the porters' wage rate in effect during a base year or increases in the consumer price index over the index value in effect during a base year. In addition, many of our leases contain fixed percentage increases over the base rent to cover escalations. Electricity is most often supplied by the landlord either on a sub-metered basis, or rent inclusion basis (i.e., a fixed fee is included in the rent for electricity, which amount may increase based upon increases in electricity rates or increases in electrical usage by the tenant). Base building services other than electricity (such as heat, air conditioning and freight elevator service during business hours, and base building cleaning) are typically provided at no additional cost, with the tenant paying additional rent only for services which exceed base building services or for services which are provided outside normal business hours. These escalations are based on actual expenses incurred in the prior calendar year. If the expenses in the current year are different from those in the prior year, then during the current year, the escalations will be adjusted to reflect the actual expenses for the current year. We record a gain on sale of real estate when title is conveyed to the buyer, subject to the buyer's financial commitment being sufficient to provide economic substance to the sale and 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. Several of the debt and preferred equity investments provide for accrual of interest at specified rates, which differ from current payment terms. Interest is recognized on such loans at the accrual rate subject to management's determination that accrued interest 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 a reduction 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 these loans individually. When a transaction meets the criteria of sale accounting, we derecognize the loan sold and recognize gain or loss based on the difference between the sales price and the carrying value of the loan sold. Any related unamortized deferred origination fees, original issue discounts, loan origination costs, discounts or premiums at the time of sale are recognized as an adjustment to the gain or loss on sale, which is included in investment income on the consolidated statement of income. Any fees received at the time of sale or syndication are recognized as part of investment income. Asset management fees are recognized on a straight-line basis over the term of the asset management agreement.
Reserve for Possible Credit Losses	Reserve for Possible Credit Losses The expense for possible credit losses in connection with debt and preferred equity investments is the charge to earnings to increase the allowance for possible credit losses to the level that we estimate to be adequate, based on Level 3 data, considering delinquencies, loss experience and collateral quality. Other factors considered relate to geographic trends and product diversification, the size of the portfolio and current economic conditions. Based upon these factors, we establish the provision for possible credit losses 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 the additional information obtained reflects increased recovery of our investment, we will adjust our reserves accordingly. There were no loan reserves recorded during three and six months ended June 30, 2015 and 2014 . Debt and preferred equity investments held for sale are carried at the lower of cost or fair market value using available market information obtained through consultation with dealers or other originators of such investments as well as discounted cash flow models based on Level 3 data pursuant to ASC 820-10. As circumstances change, management may conclude not to sell an investment designated as held for sale. In such situations, the investment will be reclassified at its net carrying value to debt and preferred equity investments held to maturity. For these reclassified investments, the difference between the current carrying value and the expected cash to be collected at maturity will be accreted into income over the remaining term of the investment.
Income Taxes	Income Taxes SL Green is taxed as a REIT under Section 856(c) of the Code. As a REIT, SL Green generally is not subject to Federal income tax. To maintain its qualification as a REIT, SL Green must distribute at least 90% of its REIT taxable income to its stockholders and meet certain other requirements. If SL Green fails to qualify as a REIT in any taxable year, we will be subject to Federal income tax on SL Green's taxable income at regular corporate rates. SL Green may also be subject to certain state, local and franchise taxes. Under certain circumstances, Federal income and excise taxes may be due on SL Green's undistributed taxable income. The Operating Partnership is a partnership and, as a result, all income and losses of the partnership are allocated to the partners for inclusion in their respective income tax returns. The only provision for income taxes included in the consolidated statements of operations relates to the Operating Partnership’s consolidated taxable REIT subsidiaries. The Operating Partnership may also be subject to certain state, local and franchise taxes. Pursuant to amendments to the Code that became effective January 1, 2001, we have elected, and may elect in the future, to treat certain of our existing or newly created corporate subsidiaries as taxable REIT subsidiaries, or TRSs. In general, TRSs may perform non-customary services for the tenants of the Company, hold assets that we cannot hold directly and generally may engage in any real estate or non-real estate related business. The TRSs generate income, resulting in Federal and state income tax liability for these entities. During the three and six months ended June 30, 2015 and 2014 , we recorded Federal, state and local tax provisions of $1.1 million , $1.4 million , $2.1 million and $5.0 million , respectively. We follow a two-step approach for evaluating uncertain tax positions. Recognition (step one) occurs when an enterprise concludes that a tax position, based solely on its technical merits, is more-likely-than-not to be sustained upon examination. Measurement (step two) determines the amount of benefit that is more-likely-than-not to be realized upon settlement. Derecognition of a tax position that was previously recognized would occur when a company subsequently determines that a tax position no longer meets the more-likely-than-not threshold of being sustained. The use of a valuation allowance as a substitute for derecognition of tax positions is prohibited.
Stock-Based Employee Compensation Plans	Stock-Based Employee Compensation Plans We have a stock-based employee compensation plan, described more fully in Note 14, "Share-based Compensation." The Company's stock options are recorded at fair value at the time of issuance. Fair value of the stock options is determined using the Black-Scholes option pricing model. The Black-Scholes model was developed for use in estimating the fair value of traded options, which have no vesting restrictions and are fully transferable. In addition, option valuation models require the input of highly subjective assumptions including the expected stock price volatility. Because our plan has characteristics significantly different from those of traded options and because changes in the subjective input assumptions can materially affect the fair value estimate, in our opinion, the existing models do not necessarily provide a reliable single measure of the fair value of the employee stock options. Compensation cost for stock options, if any, is recognized over the vesting period of the award. Our policy is to grant options with an exercise price equal to the quoted closing market price of the Company's common stock on the grant date. Awards of stock or restricted stock are expensed as compensation over the benefit period based on the fair value of the stock on the grant date. For share-based awards with a performance or market measure, we recognize compensation cost over the requisite service period, using the accelerated attribution expense method. The requisite service period begins on the date the compensation committee of SL Green's board of directors authorizes the award, adopts any relevant performance measures and communicates the award to the employees. For programs with awards that vest based on the achievement of a performance condition or market condition, we determine whether it is probable that the performance condition will be met, and estimate compensation cost based on the fair value of the award at the applicable reporting date estimated using a binomial model or market quotes. For share-based awards for which there is no pre-established performance measure, we recognize compensation cost over the service vesting period, which represents the requisite service period, on a straight-line basis. In accordance with the provisions of our share-based incentive compensation plans, we accept the return of shares of the Company's common stock, at the current quoted market price, from certain key employees to satisfy minimum statutory tax-withholding requirements related to shares that vested during the period. Awards can also be made in the form of a separate series of units of limited partnership interest in the Operating Partnership called long-term incentive plan units, or LTIP units. LTIP units, which can be granted either as free-standing awards or in tandem with other awards under our stock incentive plan, are valued by reference to the value of the Company's common stock at the time of grant, and are subject to such conditions and restrictions as the compensation committee of the Company's board of directors may determine, including continued employment or service, computation of financial metrics and/or achievement of pre-established performance goals and objectives.
Earnings per Share of the Company	Earnings per Share of the Company The Company presents both basic and diluted earnings per share, or EPS. Basic EPS excludes dilution and is computed by dividing net income or loss attributable to common stockholders by the weighted average number of common shares outstanding during the period. Basic EPS includes participating securities, consisting of unvested restricted stock that receive nonforfeitable dividends similar to shares of common stock. Diluted EPS reflects the potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted into common stock, where such exercise or conversion would result in a lower EPS amount. Diluted EPS also includes units of limited partnership interest. The dilutive effect of stock options is reflected in the weighted average diluted outstanding shares calculation by application of the treasury stock method. There is no dilutive effect for the exchangeable senior notes as the conversion premium will be paid in cash.
Earnings per Unit of the Operating Partnership	Earnings per Unit of the Operating Partnership The Operating Partnership presents both basic and diluted earnings per unit, or EPU. Basic EPU excludes dilution and is computed by dividing net income or loss attributable to common unitholders by the weighted average number of common units outstanding during the period. Basic EPU includes participating securities, consisting of unvested restricted units that receive nonforfeitable dividends similar to shares of common units. Diluted EPU reflects the potential dilution that could occur if securities or other contracts to issue common units were exercised or converted into common units, where such exercise or conversion would result in a lower EPU amount. The dilutive effect of unit options is reflected in the weighted average diluted outstanding units calculation by application of the treasury stock method. There is no dilutive effect for the exchangeable senior notes as the conversion premium will be paid in cash.
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from those estimates.
Concentrations of Credit Risk	Concentrations of Credit Risk Financial instruments that potentially subject us to concentrations of credit risk consist primarily of cash investments, debt and preferred equity investments and accounts receivable. We place our cash investments in excess of insured amounts with high quality financial institutions. The collateral securing our debt and preferred equity investments is located in New York City. See Note 5, "Debt and Preferred Equity Investments." We perform ongoing credit evaluations of our tenants and require most tenants to provide security deposits or letters of credit. Though these security deposits and letters of credit are insufficient to meet the total value of a tenant's lease obligation, they are a measure of good faith and a source of funds to offset the economic costs associated with lost rent and the costs associated with re-tenanting a space. Although the properties in our real estate portfolio are primarily located in Manhattan, we also have properties located in Brooklyn, Long Island, Westchester County, Connecticut and New Jersey. The tenants located in our buildings operate in various industries.
Reclassification	Reclassification Certain prior year balances have been reclassified to conform to our current year presentation primarily in order to eliminate discontinued operations from income from continuing operations.
Accounting Standards Updates	Accounting Standards Updates In April 2015, the Financial Accounting Standards Board, or 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 (Accounting Standards Update, or 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 expects to adopt the guidance effective January 1, 2016 and the guidance is not anticipated to 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 is currently evaluating the new guidance to determine the impact it may have 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 is 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 has adopted the standard beginning in the first quarter of 2015. The adoption of this guidance did not have a material impact on our consolidated financial statements. The Company has adopted the presentation and disclosures related to transactions accounted for as secured borrowings during the second quarter of 2015. 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 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 is 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 has adopted the standard beginning in the first quarter of 2015. The adoption of this guidance will change the presentation of discontinued operations for all properties held for sale and/or disposed of subsequent to January 1, 2015.

Organization and Basis of Pre34

Organization and Basis of Presentation (Tables)	6 Months Ended
	Jun. 30, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of commercial office properties	As of June 30, 2015 , we owned the following interests in commercial and residential properties in the New York Metropolitan area, primarily in midtown Manhattan. Our investments in the New York Metropolitan area also include investments in Brooklyn, Long Island, Westchester County, Connecticut and New Jersey, which are collectively known as the Suburban properties: Consolidated Unconsolidated Total Location Type Number of Properties Approximate Square Feet Number of Properties Approximate Square Feet Number of Properties Approximate Square Feet Weighted Average Occupancy (1) Commercial: Manhattan Office (2) 24 18,533,045 7 3,476,115 31 22,009,160 96.9 % Retail (2) 9 (3) 403,735 7 279,628 16 683,363 91.9 % Development/Redevelopment 7 779,862 5 1,952,782 12 2,732,644 36.9 % Fee Interest 2 783,530 — — 2 783,530 100.0 % 42 20,500,172 19 5,708,525 61 26,208,697 90.6 % Suburban Office 28 4,450,400 5 1,287,741 33 5,738,141 81.9 % Retail 1 52,000 — — 1 52,000 100.0 % Development/Redevelopment 1 1,000 1 — 2 1,000 100.0 % 30 4,503,400 6 1,287,741 36 5,791,141 82.1 % Total commercial properties 72 25,003,572 25 6,996,266 97 31,999,838 89.1 % Residential: Manhattan Residential 4 (3) 762,587 17 2,046,733 21 2,809,320 96.4 % Suburban Residential 1 66,611 — — 1 66,611 92.0 % Total residential properties 5 829,198 17 2,046,733 22 2,875,931 96.3 % Total portfolio 77 25,832,770 42 9,042,999 119 34,875,769 89.7 % ____________________________________________________________________ (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) Includes one office and two retail properties held for sale as of June 30, 2015. (3) As of June 30, 2015 , we owned a building that was comprised of approximately 270,132 square feet of retail space and approximately 222,855 square feet 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.

Significant Accounting Polici35

Significant Accounting Policies (Tables)	6 Months Ended
	Jun. 30, 2015
Accounting Policies [Abstract]
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 June 30, 2015 and December 31, 2014 (in thousands): June 30, 2015 December 31, 2014 Identified intangible assets (included in other assets): Gross amount $ 941,064 $ 664,297 Accumulated amortization (399,103 ) (383,236 ) Net (1) $ 541,961 $ 281,061 Identified intangible liabilities (included in deferred revenue): Gross amount $ 804,550 $ 655,755 Accumulated amortization (484,673 ) (483,948 ) Net (1) $ 319,877 $ 171,807 ____________________________________________________________________ (1) As of June 30, 2015, $3.6 million and $8.3 million of net intangible assets and net intangible liabilities, respectively, were reclassed to assets held for sale and liabilities related to assets held for sale.
Schedule of marketable securities	At June 30, 2015 and December 31, 2014, we held the following marketable securities (in thousands): June 30, 2015 December 31, 2014 Equity marketable securities $ 4,070 $ 4,332 Mortgage-backed securities 42,181 35,097 Total marketable securities available-for-sale $ 46,251 $ 39,429

Property Acquisitions (Tables)

Property Acquisitions (Tables)	6 Months Ended
	Jun. 30, 2015
Property Acquisitions
Schedule of Fair Value of Equity Interest Immediately Before Acquisition Date	The acquisition-date fair value of the equity interest in 388-390 Greenwich Street immediately before the acquisition date as well as the purchase price fair value, as determined in accordance with the methodology set out in the prior sentence, is as follows (in thousands): 388-390 Greenwich Street Contract purchase price $ 1,585,000 Net consideration funded by us at closing, excluding consideration financed by debt (208,614 ) Debt assumed (1,162,379 ) Fair value of retained equity interest 214,007 Equity and/or debt investment held (148,025 ) Other (1) 5,464 Purchase price fair value adjustment $ 71,446 ___________________________________________________________________ (1) Includes the acceleration of a deferred leasing commission from the joint venture to the Company.
2015 Acquisitions
Property Acquisitions
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed	The following summarizes our preliminary allocation of the purchase price of the assets acquired and liabilities assumed upon the closing of these acquisitions (in thousands): Upper East Side Residential (1)(2) 1640 Flatbush Avenue (1) Acquisition Date June 2015 March 2015 Ownership Type Fee Interest Fee Interest Property Type Residential/Retail Retail Purchase Price Allocation: Land $ 17,500 $ 6,120 Building and building leasehold 32,500 680 Above-market lease value — — Acquired in-place leases — — Other assets, net of other liabilities — — Assets acquired 50,000 6,800 Mark-to-market assumed debt — — Below-market lease value — — Derivatives — — Liabilities assumed — — Purchase price $ 50,000 $ 6,800 Net consideration funded by us at closing, excluding consideration financed by debt $ 50,000 $ 6,800 Equity and/or debt investment held $ — $ — Debt assumed $ — $ — ____________________________________________________________________ (1) We are currently in the process of analyzing the purchase price allocation and, as such, we have not allocated any value to intangible assets such as above- and below-market lease or in-place leases. (2) We, along with our joint venture partner, acquired this property for consideration that included the issuance of $13.8 million aggregate liquidation preference of Series N Preferred Units of limited partnership interest of the Operating Partnership and cash. We hold a 95.1% controlling interest in this joint venture.
2014 Acquisitions
Property Acquisitions
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed	During the six months ended June 30, 2015 , we finalized the purchase price allocations 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 Street (1) 719 Seventh Avenue (1)(2) 115 Spring Street (1) 388-390 Greenwich Street (1)(3) Acquisition Date October 2014 July 2014 July 2014 May 2014 Ownership Type Fee Interest Fee Interest Fee Interest Fee Interest Property Type Retail Development Retail Office Purchase Price Allocation: Land $ 8,215 $ 41,850 $ 11,078 $ 516,292 Building and building leasehold 26,717 — 44,799 964,434 Above-market lease value — — — — Acquired in-place leases 1,015 — 2,037 302,430 Other assets, net of other liabilities 3 — — 6,495 Assets acquired 35,950 41,850 57,914 1,789,651 Mark-to-market assumed debt — — — — Below-market lease value 3,701 — 4,789 186,782 Derivatives — — — 18,001 Liabilities assumed 3,701 — 4,789 204,783 Purchase price $ 32,249 $ 41,850 $ 53,125 $ 1,584,868 Net consideration funded by us at closing, excluding consideration financed by debt $ 32,249 $ 41,850 $ 53,125 $ 208,614 Equity and/or debt investment held $ — $ — $ — $ 148,025 Debt assumed $ — $ — $ — $ 1,162,379 ____________________________________________________________________ (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, $14.4 million and $26.7 million to land and building, respectively, at 719 Seventh Avenue, $15.9 million and $37.2 million to land and building, respectively, at 115 Spring Street and $558.7 million and $1.0 billion to land and building, respectively, at 388-390 Greenwich. The impact to our consolidated statement of income for the six months ended June 30, 2015 was $6.8 million in rental revenue for the amortization of aggregate below-market leases and $10.1 million of depreciation expense. (2) We, along with our joint venture partner, acquired this property for consideration that included the issuance of $14.1 million aggregate liquidation preference of Series L Preferred Units of limited partnership interest of the Operating Partnership and $9.5 million aggregate liquidation preference of Series K Preferred Units of limited partnership interest of the Operating Partnership. We hold a 75.0% controlling interest in this joint venture. (3) In May 2014, we acquired Ivanhoe Cambridge, Inc.'s 49.65% economic interest in this property, thereby consolidating full ownership of the property. The transaction valued the consolidated interests at $1.585 billion . Simultaneous with the closing, we refinanced the previous mortgage with a $1.45 billion mortgage. We also assumed the existing derivative instruments, which swapped $504.0 million of the mortgage to fixed rate (in October 2014, we entered into multiple swap agreements to hedge our interest rate exposure on an additional $500.0 million portion of this mortgage. See Note 8, "Mortgages and Other Loans Payable" for further details). We recognized a purchase price fair value adjustment of $71.4 million upon closing of this transaction. This property, which we initially acquired in December 2007, was previously accounted for as an investment in unconsolidated joint ventures.

Properties Held for Sale and 37

Properties Held for Sale and Property Dispositions (Tables)	6 Months Ended
	Jun. 30, 2015
Discontinued Operations and Disposal Groups [Abstract]
Summary of properties sold and income from discontinued operations	The following table summarizes the property sold during the six months ended June 30, 2015 : Property Disposition Date Property Type Approximate Usable Square Feet Sales Price (in millions) Gain on Sale (1) (in millions) 180 Maiden Lane January 2015 Office 1,090,000 $ 470.0 $ 17.0 ____________________________________________________________________ (1) The gain on sale for 180 Maiden Lane is net of a $0.8 million employee compensation award accrued in connection with the realization of this investment gain as a bonus to certain employees that were instrumental in realizing the gain on sale. Additionally, amounts do not include adjustments for expense recorded in subsequent periods. The following table summarizes net income from discontinued operations for the three and six months ended June 30, 2015 and 2014 , respectively (in thousands): Three Months Ended June 30, Six Months Ended June 30, 2015 2014 2015 2014 Revenues Rental revenue $ — $ 13,993 $ 236 $ 35,172 Escalation and reimbursement revenues — 1,211 (127 ) 4,609 Other income — 17 — 20 Total revenues — 15,221 109 39,801 Operating expenses — 1,868 (631 ) 6,329 Real estate taxes — 1,846 250 5,831 Ground rent — 805 — 3,001 Transaction related costs — 40 (49 ) 40 Interest expense, net of interest income — 3,448 109 8,109 Amortization of deferred financing costs — 110 3 321 Depreciation and amortization — 1,459 — 4,756 Total expenses — 9,576 (318 ) 28,387 Net income from discontinued operations $ — $ 5,645 $ 427 $ 11,414

Debt and Preferred Equity Inv38

Debt and Preferred Equity Investments (Tables)	6 Months Ended
	Jun. 30, 2015
Investments, Debt and Equity Securities [Abstract]
Summary of debt investments	As of June 30, 2015 and December 31, 2014, we held the following debt investments with an aggregate weighted average current yield of 10.15% at June 30, 2015 (in thousands): Loan Type June 30, 2015 Future Funding Obligations June 30, 2015 Senior Financing June 30, 2015 Carrying Value (1) December 31, 2014 Carrying Value (1) Initial Maturity Date Fixed Rate Investments: Jr. Mortgage Participation $ — $ 205,000 $ 71,909 $ 70,688 February 2016 Jr. Mortgage Participation/Mezzanine Loan (2)(3) — — 46,136 45,611 Various (2) Jr. Mortgage Participation — 133,000 49,000 49,000 June 2016 Mezzanine Loan — 165,000 71,962 71,656 November 2016 Jr. Mortgage Participation/Mezzanine Loan — 1,109,000 102,646 98,934 March 2017 Mezzanine Loan (3) — — 65,969 65,770 March 2017 Mezzanine Loan (4) 5,663 502,100 35,409 24,608 June 2017 Mezzanine Loan — 539,000 49,643 49,629 July 2018 Mortgage Loan (5) — — 26,235 26,209 February 2019 Mortgage Loan — — 576 637 August 2019 Loan Type June 30, 2015 Future Funding Obligations June 30, 2015 Senior Financing June 30, 2015 Carrying Value (1) December 31, 2014 Carrying Value (1) Initial Maturity Date Mezzanine Loan — 15,000 3,500 3,500 September 2021 Mezzanine Loan (6) — 90,000 19,933 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 Total fixed rate $ 5,663 $ 2,853,100 $ 572,918 $ 582,174 Floating Rate Investments: Mezzanine Loan — 110,000 49,882 49,614 September 2015 Mezzanine Loan — 775,000 74,014 73,402 March 2016 Mortgage/Mezzanine Loan 18,906 — 77,447 — April 2016 Mortgage/Mezzanine Loan (9) — — 109,910 109,527 June 2016 Mezzanine Loan (10) — 160,000 22,599 22,573 June 2016 Mezzanine Loan — 115,000 24,913 24,910 July 2016 Mezzanine Loan 11,364 296,966 62,615 — November 2016 Mezzanine Loan — 360,000 99,269 99,023 November 2016 Mezzanine Loan (11) 15,009 123,343 46,050 42,750 December 2016 Mezzanine Loan 553 38,423 13,434 11,835 December 2016 Mortgage/Mezzanine Loan (12) 72,842 — 117,999 — January 2017 Mezzanine Loan 8,466 92,705 21,306 20,651 January 2017 Jr. Mortgage Participation/Mezzanine Loan 2,101 114,497 39,383 38,524 July 2017 Mortgage/Mezzanine Loan — — 22,840 22,803 July 2017 Mortgage/Mezzanine Loan — — 16,874 16,848 September 2017 Mezzanine Loan — 60,000 14,880 14,859 November 2017 Mortgage/Mezzanine Loan (13) 795 — 14,892 14,845 December 2017 Jr. Mortgage Participation — 40,000 19,815 — April 2018 Mezzanine Loan — 350,000 34,671 — April 2018 Jr. Mortgage Participation/Mezzanine Loan — 55,000 20,522 20,533 July 2018 Mortgage/Mezzanine Loan — — 18,237 18,083 February 2019 Mezzanine Loan — 38,000 21,825 21,807 March 2019 Mezzanine Loan (14) — — — 33,726 Mezzanine Loan (14) — — — 37,322 Total floating rate $ 130,036 $ 2,728,934 $ 943,377 $ 693,635 Total $ 135,699 $ 5,582,034 $ 1,516,295 $ 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 was sold in July 2015 and the $23.2 million mezzanine loan matures in May 2016. (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) In May 2015, the maturity date was extended to June 2016. (10) 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. (11) In February 2015, the maturity date was extended to December 2016. (12) 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. (13) 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. (14) These loans were repaid in April 2015.
Summary of preferred equity investments	As of June 30, 2015 and December 31, 2014 , we held the following preferred equity investments with an aggregate weighted average current yield of 10.18% at June 30, 2015 (in thousands): Type June 30, 2015 Future Funding Obligations June 30, 2015 Senior Financing June 30, 2015 Carrying Value (1) December 31, 2014 (1) Initial Mandatory Redemption Preferred equity (2)(3) $ — $ 550,000 $ 126,817 $ 123,041 July 2015 Preferred equity (4) — 70,000 9,960 9,954 March 2018 Preferred equity 5,580 60,795 32,162 — November 2018 $ 5,580 $ 680,795 $ 168,939 $ 132,995 ____________________________________________________________________ (1) Carrying value is net of deferred origination fees. (2) The difference between the pay and accrual rates is included as an addition to the principal balance outstanding. (3) This investment was redeemed in July 2015. (4) In March 2015, the redemption date was extended to March 2018.

Investments in Unconsolidated39

Investments in Unconsolidated Joint Ventures (Tables)	6 Months Ended
	Jun. 30, 2015
Equity Method Investments and Joint Ventures [Abstract]
Schedule of general information on joint ventures	As of June 30, 2015 and December 31, 2014 , the carrying value for acquisition, development and construction arrangements were as follows (in thousands): Loan Type June 30, 2015 December 31, 2014 Initial Maturity Date Mezzanine loan and preferred equity $ 99,777 $ 99,629 March 2016 Mezzanine loan (1) 45,913 46,246 February 2022 $ 145,690 $ 145,875 ____________________________________________________________________ (1) We have an option to convert our loan to equity interest subject to certain conditions. In addition, we have determined that our option to convert the loan to equity is not a derivative financial instrument pursuant to Generally Accepted Accounting Principles, or GAAP. As such, the embedded feature is not required to be bifurcated and the fair value accounting for the embedded feature at each reporting date is not applicable. The table below provides general information on each of our joint ventures as of June 30, 2015 : Property Partner Ownership Interest Economic Interest Approximate Square Feet Acquisition Date Acquisition Price (1) (in thousands) 100 Park Avenue Prudential Real Estate Investors 49.90% 49.90% 834,000 January 2000 $ 95,800 717 Fifth Avenue Jeff Sutton/Private Investor 10.92% 10.92% 119,500 September 2006 251,900 800 Third Avenue (2) Private Investors 60.52% 60.52% 526,000 December 2006 285,000 1745 Broadway Ivanhoe Cambridge, Inc. 56.88% 56.88% 674,000 April 2007 520,000 Jericho Plaza Onyx Equities/Credit Suisse 20.26% 20.26% 640,000 April 2007 210,000 The Meadows (3) Onyx Equities 50.00% 50.00% 582,100 September 2007 111,500 600 Lexington Avenue Canadian Pension Plan Investment Board 55.00% 55.00% 303,515 May 2010 193,000 Property Partner Ownership Interest Economic Interest Approximate Square Feet Acquisition Date Acquisition Price (1) (in thousands) 11 West 34th Street Private Investor/ Jeff Sutton 30.00% 30.00% 17,150 December 2010 10,800 7 Renaissance Louis Cappelli 50.00% 50.00% 65,641 December 2010 4,000 3 Columbus Circle (4) The Moinian Group 48.90% 48.90% 741,500 January 2011 500,000 280 Park Avenue Vornado Realty Trust 50.00% 50.00% 1,219,158 March 2011 400,000 1552-1560 Broadway (5) Jeff Sutton 50.00% 50.00% 35,897 August 2011 136,550 724 Fifth Avenue Jeff Sutton 50.00% 50.00% 65,040 January 2012 223,000 10 East 53rd Street Canadian Pension Plan Investment Board 55.00% 55.00% 354,300 February 2012 252,500 33 Beekman (6) Harel Insurance and Finance/TNG 33 LLC 45.90% 45.90% — August 2012 31,000 521 Fifth Avenue Plaza Global Real Estate Partners LP 50.50% 50.50% 460,000 November 2012 315,000 21 East 66th Street (7) Private Investors 32.28% 32.28% 16,736 December 2012 75,000 315 West 36th Street Private Investors 35.50% 35.50% 147,619 December 2012 45,000 650 Fifth Avenue (8) Jeff Sutton 50.00% 50.00% 32,324 November 2013 — 121 Greene Street Jeff Sutton 50.00% 50.00% 7,131 September 2014 27,400 175-225 Third Street KCLW 3rd Street LLC/LIVWRK LLC 95.00% 95.00% — October 2014 74,600 55 West 46th Street Prudential Real Estate Investors 25.00% 25.00% 347,000 November 2014 295,000 Stonehenge Portfolio (9) Various Various Various 2,046,733 February 2015 36,668 ____________________________________________________________________ (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 March 2015, we acquired an additional 17.56% interest in this joint venture for $67.5 million . (3) In June 2015, we entered into an agreement to sell the property for $121.1 million . This transaction is expected to close during the third quarter of 2015, subject to customary closing conditions. (4) As a result of the sale of a condominium interest in September 2012, Young & Rubicam, Inc., or Y&R, owns floors three through eight at the property. Because the joint venture has an option to repurchase these floors, the gain associated with this sale was deferred. (5) The purchase price represents only the purchase of the 1552 Broadway interest which comprised approximately 13,045 square feet. The joint venture also owns a long-term leasehold interest in the retail space and certain other spaces at 1560 Broadway, which is adjacent to 1552 Broadway. (6) As of June 30, 2015, the redevelopment project was substantially complete and will be conveyed to Pace University during the third quarter of 2015. (7) We hold a 32.28% interest in three retail and two residential units at the property and a 16.14% interest in three residential units at the property. (8) The joint venture owns a long-term leasehold interest in the retail space at 650 Fifth Avenue. In connection with the ground lease obligation, SLG provided a performance guaranty and our joint venture partner executed a contribution agreement to reflect its pro rata obligation. In the event the property is converted into a condominium unit and the landlord elects the purchase option, the joint venture shall be obligated to acquire the unit at the then fair value. (9) In February 2015, we acquired an interest in a portfolio of Manhattan residential and retail properties for $40.2 million , of which $3.5 million represented an increase in ownership interest in six of our existing consolidated joint venture properties. The $40.2 million of consideration included the issuance of $40.0 million aggregate liquidation preference of 3.75% Series M Preferred Units of limited partnership interest of the Operating Partnership.
Schedule of first mortgage notes payable collateralized by the respective joint venture properties and assignment of leases	The first mortgage notes and other loans payable collateralized by the respective joint venture properties and assignment of leases at June 30, 2015 and December 31, 2014 , respectively, are as follows (amounts in thousands): Property Maturity Date Interest Rate (1) June 30, 2015 December 31, 2014 Fixed Rate Debt: 7 Renaissance December 2015 10.00 % $ 2,600 $ 2,147 11 West 34th Street January 2016 4.82 % 16,749 16,905 280 Park Avenue June 2016 6.57 % 696,563 700,171 1745 Broadway January 2017 5.68 % 340,000 340,000 Jericho Plaza (2) May 2017 5.65 % 163,750 163,750 800 Third Avenue August 2017 6.00 % 20,910 20,910 315 West 36th Street (3) December 2017 3.16 % 25,000 25,000 521 Fifth Avenue November 2019 3.73 % 170,000 170,000 717 Fifth Avenue (4) July 2022 4.45 % 300,000 300,000 21 East 66th Street April 2023 3.60 % 12,000 12,000 717 Fifth Avenue (4) July 2024 9.00 % 319,900 314,381 3 Columbus Circle (5) March 2025 3.61 % 350,000 — Stonehenge Portfolio (6) Various 4.18 % 434,492 — Total fixed rate debt $ 2,851,964 $ 2,065,264 Floating Rate Debt: The Meadows September 2015 7.75 % 67,350 67,350 1552 Broadway (7) April 2016 4.26 % 188,410 184,210 Other loan payable June 2016 1.08 % 30,000 30,000 650 Fifth Avenue (8) October 2016 3.69 % 65,000 65,000 175-225 Third Street December 2016 4.25 % 40,000 40,000 10 East 53rd Street February 2017 2.69 % 125,000 125,000 724 Fifth Avenue April 2017 2.60 % 275,000 275,000 33 Beekman (9) August 2017 2.93 % 65,506 52,283 600 Lexington Avenue October 2017 2.28 % 114,774 116,740 55 West 46th Street (10) October 2017 2.49 % 150,000 150,000 Stonehenge Portfolio December 2017 3.25 % 10,500 — 121 Greene Street November 2019 1.69 % 15,000 15,000 100 Park Avenue February 2021 1.94 % 360,000 360,000 21 East 66th Street June 2033 2.88 % 1,844 1,883 3 Columbus Circle (5) — 230,974 Total floating rate debt $ 1,508,384 $ 1,713,440 Total joint venture mortgages and other loans payable $ 4,360,348 $ 3,778,704 ____________________________________________________________________ (1) Effective weighted average interest rate for the three months ended June 30, 2015 , taking into account interest rate hedges in effect during the period. (2) This loan is in default as of June 30, 2015 due to the non-payment of debt service. The joint venture is in discussions with the special servicer on account of the loan. (3) In July 2015, the joint venture refinanced the previous mortgage. (4) These loans are comprised of a $300.0 million fixed rate mortgage loan and $290.0 million mezzanine loan. The mezzanine loan is subject to accretion based on the difference between contractual interest rate and contractual pay rate. (5) In March 2015, the joint venture refinanced the previous mortgage and incurred a net loss on early extinguishment of debt of $0.8 million . (6) Amount is comprised of $13.5 million , $56.0 million , $35.0 million , $7.4 million , $142.7 million , and $179.9 million in fixed-rate mortgages that mature in July 2016, June 2017, November 2017, February 2018, August 2019, and June 2024, respectively. (7) These loans are comprised of a $150.0 million mortgage loan and a $41.5 million mezzanine loan. As of June 30, 2015 , $1.7 million of the mortgage loan and $1.4 million of the mezzanine loan was unfunded. (8) This loan has a committed amount of $97.0 million , of which $32.0 million was unfunded as of June 30, 2015 . (9) This loan has a committed amount of $75.0 million , of which $18.4 million is recourse to us. Our partner has indemnified us for its pro rata share of the recourse guarantee. A portion of the guarantee terminates upon the joint venture reaching certain milestones. We believe it is unlikely that we will be required to perform under this guarantee. (10) This loan has a committed amount of $190.0 million , of which $40.0 million was unfunded as of June 30, 2015 .
Schedule of combined balance sheets for the unconsolidated joint ventures	The combined balance sheets for the unconsolidated joint ventures, at June 30, 2015 and December 31, 2014, are as follows (in thousands): June 30, 2015 December 31, 2014 Assets Commercial real estate property, net $ 6,124,617 $ 5,275,632 Other assets 924,855 810,567 Total assets $ 7,049,472 $ 6,086,199 Liabilities and members' equity Mortgages and other loans payable $ 4,360,348 $ 3,778,704 Other liabilities 495,523 485,572 Members' equity 2,193,601 1,821,923 Total liabilities and members' equity $ 7,049,472 $ 6,086,199 Company's investments in unconsolidated joint ventures $ 1,262,723 $ 1,172,020
Schedule of combined statements of income for the unconsolidated joint ventures	The combined statements of income for the unconsolidated joint ventures, from acquisition date through the three and six months ended June 30, 2015 and 2014 are as follows (in thousands): Three Months Ended June 30, Six Months Ended June 30, 2015 2014 2015 2014 Total revenues $ 143,535 $ 130,495 $ 272,451 $ 291,633 Operating expenses 26,345 18,362 51,831 45,045 Ground rent 2,572 2,632 5,164 4,657 Real estate taxes 22,335 15,406 41,711 32,342 Interest expense, net of interest income 51,715 44,728 95,722 97,064 Amortization of deferred financing costs 3,145 2,026 6,155 6,659 Transaction related costs, net of recoveries 3 (207 ) 11 64 Depreciation and amortization 37,894 33,858 70,878 79,462 Total expenses 144,009 116,805 271,472 265,293 Loss on early extinguishment of debt — (3,546 ) (833 ) (6,743 ) Net income (loss) before gain on sale $ (474 ) $ 10,144 $ 146 $ 19,597 Company's equity in net income from unconsolidated joint ventures $ 2,994 $ 8,619 $ 7,024 $ 14,748

Deferred Costs (Tables)

Deferred Costs (Tables)	6 Months Ended
	Jun. 30, 2015
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Schedule of components of deferred costs	Deferred costs at June 30, 2015 and December 31, 2014 consisted of the following (in thousands): June 30, 2015 December 31, 2014 Deferred leasing $ 406,498 $ 385,555 Deferred financing 191,980 193,776 598,478 579,331 Less accumulated amortization (269,640 ) (251,369 ) Deferred costs, net $ 328,838 $ 327,962

Mortgages and Other Loans Pay41

Mortgages and Other Loans Payable (Tables)	6 Months Ended
	Jun. 30, 2015
Mortgages and Other Loans Payable
Schedule of first mortgages and other loans payable collateralized by the respective properties and assignment of leases	The first mortgages and other loans payable collateralized by the respective properties and assignment of leases at June 30, 2015 and December 31, 2014 , respectively, were as follows (amounts in thousands): Property Maturity Date Interest Rate (1) June 30, 2015 December 31, 2014 Fixed Rate Debt: 500 West Putnam Avenue January 2016 5.52 % $ 22,676 $ 22,968 Landmark Square December 2016 4.00 % 80,424 81,269 485 Lexington Avenue February 2017 5.61 % 450,000 450,000 120 West 45th Street (2) February 2017 6.12 % 170,000 170,000 762 Madison Avenue (3) February 2017 3.86 % 7,959 8,045 885 Third Avenue July 2017 6.26 % 267,650 267,650 1745 Broadway June 2018 4.81 % 16,000 16,000 388-390 Greenwich Street (4) June 2018 3.25 % 1,004,000 1,004,000 One Madison Avenue May 2020 5.91 % 554,405 565,742 100 Church Street July 2022 4.68 % 226,862 228,612 919 Third Avenue (5) June 2023 5.12 % 500,000 500,000 400 East 57th Street February 2024 4.13 % 68,276 68,896 400 East 58th Street February 2024 4.13 % 29,261 29,527 420 Lexington Avenue October 2024 3.99 % 300,000 300,000 1515 Broadway March 2025 3.93 % 900,000 900,000 Series J Preferred Units (6) April 2051 3.75 % 4,000 4,000 711 Third Avenue (7) — 120,000 Total fixed rate debt $ 4,601,513 $ 4,736,709 Floating Rate Debt: Master Repurchase Agreement December 2015 3.44 % 106,421 100,000 388-390 Greenwich Street (4) June 2018 1.93 % 446,000 446,000 248-252 Bedford Avenue June 2019 1.69 % 29,000 29,000 220 East 42nd Street October 2020 1.79 % 275,000 275,000 180 Maiden Lane (8) — 253,942 Total floating rate debt $ 856,421 $ 1,103,942 Total fixed rate and floating rate debt $ 5,457,934 $ 5,840,651 Mortgages reclassed to liabilities related to assets held for sale (170,000 ) (253,942 ) Total mortgages and other loans payable $ 5,287,934 $ 5,586,709 ____________________________________________________________________ (1) Effective weighted average interest rate for the three months ended June 30, 2015 , taking into account interest rate hedges in effect during the period. (2) This property was held for sale at June 30, 2015 and the related mortgage is included in liabilities related to assets held for sale. (3) In February 2015, we entered into a new swap agreement with a fixed interest rate of 3.86% per annum, which replaced the previous swap agreement with a fixed interest rate of 3.75% per annum. (4) In connection with the acquisition of our joint venture partner's interest, we assumed the existing derivative instruments, which swapped $504.0 million of the mortgage to a fixed rate mortgage which bears interest at 3.80% per annum. In October 2014, we entered into multiple swap agreements to hedge our interest rate exposure on the additional $500.0 million portion of this mortgage, which was swapped to a fixed rate of 2.69% per annum. Including the as-of right extension option, this loan matures in June 2021. (5) We own a 51.0% controlling interest in the joint venture that is the borrower on this loan. (6) In connection with the acquisition of a commercial real estate property, the Operating Partnership issued $4.0 million , or 4,000 , 3.75% Series J Preferred Units of limited partnership interest, or the Series J Preferred Units, with a mandatory liquidation preference of $1,000.00 per unit. The Series J Preferred Units are accounted for as debt because they can be redeemed in cash by the Operating Partnership on the earlier of (i) the date of the sale of the property or (ii) April 30, 2051 or at the option of the unitholders as further prescribed in the related agreement. (7) In March 2015, we repaid the mortgage. (8) This property was held for sale at December 31, 2014 and the related mortgage is included in liabilities related to assets held for sale. In January 2015, the property was sold and the debt was repaid.

Corporate Indebtedness (Tables)

Corporate Indebtedness (Tables)	6 Months Ended
	Jun. 30, 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 June 30, 2015 and December 31, 2014 , respectively, by scheduled maturity date (dollars in thousands): Issuance June 30, 2015 Unpaid Principal Balance June 30, 2015 Accreted Balance December 31, 2014 Accreted Balance Coupon Rate (1) Effective Rate Term (in Years) Maturity Date March 31, 2006 (2) $ 255,308 $ 255,272 $ 255,250 6.00 % 6.00 % 10 March 31, 2016 October 12, 2010 (3) 345,000 314,993 309,069 3.00 % 3.00 % 7 October 15, 2017 August 5, 2011 (4) 250,000 249,777 249,744 5.00 % 5.00 % 7 August 15, 2018 March 16, 2010 (4) 250,000 250,000 250,000 7.75 % 7.75 % 10 March 15, 2020 November 15, 2012 (4) 200,000 200,000 200,000 4.50 % 4.50 % 10 December 1, 2022 March 26, 2007 (5) 10,008 10,008 10,008 3.00 % 3.00 % 20 March 30, 2027 June 27, 2005 (2)(6) — — 7 $ 1,310,316 $ 1,280,050 $ 1,274,078 ____________________________________________________________________ (1) Interest on the senior unsecured notes is payable semi-annually with principal and unpaid interest due on the scheduled maturity dates. (2) Issued by ROP. (3) Issued by the Operating Partnership. Interest on these exchangeable notes is payable semi-annually on April 15 and October 15. The notes had an initial exchange rate representing an exchange price that was set at a 30.0% premium to the last reported sale price of SL Green's common stock on October 6, 2010, or $85.81 . The initial exchange rate is subject to adjustment under certain circumstances. The current exchange rate is 12.2163 shares of SL Green's common stock per $1,000 principal amount of these notes. The notes are senior unsecured obligations of the Operating Partnership and are exchangeable upon the occurrence of specified events and during the period beginning on the twenty-second scheduled trading day prior to the maturity date and ending on the second business day prior to the maturity date, into cash or a combination of cash and shares of SL Green's common stock, if any, at our option. As a result of meeting specified events (as defined in the Indenture Agreement), these notes became exchangeable commencing January 1, 2015 and will remain exchangeable through September 30, 2015. The notes are guaranteed by ROP. On the issuance date, $78.3 million of the debt balance was recorded in equity. As of June 30, 2015 , $30.0 million remained to be amortized into the debt balance. (4) Issued by the Company, the Operating Partnership and ROP, as co-obligors. (5) Issued by the Operating Partnership. Interest on these remaining exchangeable notes is payable semi-annually on March 30 and September 30. The notes have an initial exchange rate representing an exchange price that was set at a 25.0% premium to the last reported sale price of the Company's common stock on March 20, 2007, or $173.30 . The initial exchange rate is subject to adjustment under certain circumstances. The current exchange rate is 5.7952 shares of SL Green's common stock per $1,000 principal amount of these notes. The notes are senior unsecured obligations of the Operating Partnership and are exchangeable upon the occurrence of specified events and during the period beginning on the twenty-second scheduled trading day prior to the maturity date and ending on the second business day prior to the maturity date, into cash or a combination of cash and shares of SL Green's common stock, if any, at our option. The notes are currently redeemable at the Operating Partnership’s option. The Operating Partnership may be required to repurchase the notes on March 30, 2017 and 2022, and upon the occurrence of certain designated events. (6) In April 2015, we redeemed the remaining outstanding debentures.
Schedule of combined aggregate principal maturities	Combined aggregate principal maturities of mortgages and other loans payable, 2012 credit facility, trust preferred securities, senior unsecured notes and our share of joint venture debt as of June 30, 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 Trust Preferred Securities Senior Unsecured Notes Total Joint Venture Debt Remaining 2015 $ 15,354 $ 106,421 $ — $ — $ — $ — $ 121,775 $ 38,176 2016 47,360 100,311 — — — 255,308 402,979 534,057 2017 (1) 61,063 895,329 — — — 355,008 1,311,400 585,526 2018 64,462 16,000 — — — 250,000 330,462 2,196 2019 70,409 28,317 — 833,000 — — 931,726 104,687 Thereafter 200,403 3,852,505 705,000 — 100,000 450,000 5,307,908 446,742 $ 459,051 $ 4,998,883 $ 705,000 $ 833,000 $ 100,000 $ 1,310,316 $ 8,406,250 $ 1,711,384 ___________________________________________________________________ (1) Scheduled principal repayments include the mortgage at 120 West 45th Street, which is included in liabilities related to assets held for sale.
Schedule of consolidated interest expense, excluding capitalized interest	Consolidated interest expense, excluding capitalized interest, was comprised of the following (in thousands): Three Months Ended June 30, Six Months Ended June 30, 2015 2014 2015 2014 Interest expense $ 76,472 $ 78,419 $ 152,930 $ 155,127 Interest income (726 ) (549 ) (1,377 ) (1,079 ) Interest expense, net $ 75,746 $ 77,870 $ 151,553 $ 154,048 Interest capitalized $ 7,611 $ 6,218 $ 16,169 $ 10,490

Related Party Transactions (Tab

Related Party Transactions (Tables)	6 Months Ended
	Jun. 30, 2015
Related Party Transactions [Abstract]
Schedule of amounts due from/to related parties	Amounts due from related parties at June 30, 2015 and December 31, 2014 consisted of the following (in thousands): June 30, 2015 December 31, 2014 Due from joint ventures $ 1,308 $ 1,254 Other 10,087 10,481 Related party receivables $ 11,395 $ 11,735

Noncontrolling Interests on t44

Noncontrolling Interests on the Company's Consolidated Financial Statements (Tables)	6 Months Ended
	Jun. 30, 2015
Noncontrolling Interest [Abstract]
Schedule of Noncontrolling Interest	Below is the rollforward analysis of the activity relating to the noncontrolling interests in the Operating Partnership as of June 30, 2015 and December 31, 2014 (in thousands): June 30, 2015 December 31, 2014 Balance at beginning of period $ 469,524 $ 265,476 Distributions (4,693 ) (7,849 ) Issuance of common units 25,241 56,469 Redemption of common units (37,992 ) (31,653 ) Net income 166 18,467 Accumulated other comprehensive income allocation (158 ) 175 Fair value adjustment (20,670 ) 168,439 Balance at end of period $ 431,418 $ 469,524
Schedule of Preferred Unit Activity	Below is the rollforward analysis of the activity relating to the preferred units in the Operating Partnership as of June 30, 2015 and December 31, 2014 (in thousands): June 30, 2015 December 31, 2014 Balance at beginning of period $ 71,115 $ 49,550 Issuance of preferred units 53,808 23,565 Redemption of preferred units (200 ) (2,000 ) Balance at end of period $ 124,723 $ 71,115

Stockholders' Equity of the C45

Stockholders' Equity of the Company (Tables)	6 Months Ended
	Jun. 30, 2015
Stockholders' Equity Note [Abstract]
Schedule of Earnings Per Share	SL Green's earnings per share for the three and six months ended June 30, 2015 and 2014 are computed as follows (in thousands): Three Months Ended June 30, Six Months Ended June 30, Numerator 2015 2014 2015 2014 Basic Earnings: (Loss) income attributable to SL Green common stockholders $ (39,106 ) $ 235,541 $ 4,171 $ 381,631 Effect of Dilutive Securities: Redemption of units to common shares — 8,645 166 13,374 Diluted Earnings: (Loss) income attributable to SL Green common stockholders $ (39,106 ) $ 244,186 $ 4,337 $ 395,005 Three Months Ended June 30, Six Months Ended June 30, Denominator 2015 2014 2015 2014 Basic Shares: Weighted average common stock outstanding 99,579 95,455 98,994 95,288 Effect of Dilutive Securities: Redemption of units to common shares — 3,515 3,936 3,339 Stock-based compensation plans — 514 493 501 Diluted weighted average common stock outstanding 99,579 99,484 103,423 99,128

Partners' Capital of the Oper46

Partners' Capital of the Operating Partnership (Tables)	6 Months Ended
	Jun. 30, 2015
Equity [Abstract]
Schedule of calculation of numerator and denominator in earnings per unit	The Operating Partnership's earnings per unit for the three and six months ended June 30, 2015 and 2014 are computed as follows (in thousands): Three Months Ended June 30, Six Months Ended June 30, Numerator 2015 2014 2015 2014 Basic and Diluted Earnings: (Loss) income attributable to SLGOP common unitholders $ (40,683 ) $ 244,186 $ 4,337 $ 395,005 Three Months Ended June 30, Six Months Ended June 30, Denominator 2015 2014 2015 2014 Basic units: Weighted average common units outstanding 103,487 98,970 102,930 98,627 Effect of Dilutive Securities: Stock-based compensation plans — 514 493 501 Diluted weighted average common units outstanding 103,487 99,484 103,423 99,128

Share-based Compensation (Table

Share-based Compensation (Tables)	6 Months Ended
	Jun. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of weighted average assumptions used to estimate the grant date fair value of options granted	The fair value of each stock option granted is estimated on the date of grant using the Black-Scholes option pricing model based on historical information with the following weighted average assumptions for grants during the six months ended June 30, 2015 and year ended December 31, 2014 . June 30, 2015 December 31, 2014 Dividend yield 1.60 % 1.60 % Expected life of option 3.5 years 3.6 years Risk-free interest rate 1.02 % 1.29 % Expected stock price volatility 34.00 % 33.97 %
Summary of the status of stock options and changes during the period	A summary of the status of the Company's stock options as of June 30, 2015 and December 31, 2014 and changes during the six months ended June 30, 2015 and the year ended December 31, 2014 are as follows: June 30, 2015 December 31, 2014 Options Outstanding Weighted Average Exercise Price Options Outstanding Weighted Average Exercise Price Balance at beginning of year 1,462,726 $ 87.98 1,765,034 $ 83.24 Granted 12,000 128.82 102,050 119.12 Exercised (154,836 ) 75.43 (348,156 ) 72.76 Lapsed or cancelled (18,767 ) 100.67 (56,202 ) 90.03 Balance at end of year 1,301,123 $ 89.66 1,462,726 $ 87.98 Options exercisable at end of year 606,157 $ 88.15 428,951 $ 90.32 Weighted average fair value of options granted during the year $ 356,288 $ 2,841,678
Summary of restricted stock and charges during the period	A summary of the Company's restricted stock as of June 30, 2015 and December 31, 2014 and charges during the six months ended June 30, 2015 and the year ended December 31, 2014 are as follows: June 30, 2015 December 31, 2014 Balance at beginning of period 3,000,979 2,994,197 Granted 3,053 9,550 Cancelled (2,900 ) (2,768 ) Balance at end of period 3,001,132 3,000,979 Vested during the period 84,581 75,043 Compensation expense recorded $ 3,812,029 $ 9,658,019 Weighted average fair value of restricted stock granted during the period $ 391,271 $ 1,141,675

Accumulated Other Comprehensi48

Accumulated Other Comprehensive Loss of the Company (Tables)	6 Months Ended
	Jun. 30, 2015
SL Green Realty Corp
Accumulated Other Comprehensive Income (Loss) [Line Items]
Schedule of Accumulated Other Comprehensive Income (Loss)	The following tables set forth the changes in accumulated other comprehensive income (loss) by component as of June 30, 2015 (in thousands): Net unrealized (loss) gain on derivative instruments ( 1 ) SL Green’s share of joint venture net unrealized (loss) gain on derivative instruments ( 2 ) Unrealized gain and (loss) on marketable securities Total Balance at December 31, 2014 $ (9,498 ) $ (95 ) $ 2,613 $ (6,980 ) Other comprehensive loss before reclassifications (8,258 ) (926 ) (654 ) (9,838 ) Amounts reclassified from accumulated other comprehensive income 5,275 637 — 5,912 Balance at June 30, 2015 $ (12,481 ) $ (384 ) $ 1,959 $ (10,906 ) ____________________________________________________________________ (1) Amount reclassified from accumulated other comprehensive income (loss) is included in interest expense in the respective consolidated statements of operations. As of June 30, 2015 and December 31, 2014 , the deferred net losses from these terminated hedges, which is included in accumulated other comprehensive loss relating to net unrealized loss on derivative instrument, was $10.8 million and $11.8 million , respectively. (2) Amount reclassified from accumulated other comprehensive income (loss) is included in equity in net income from unconsolidated joint ventures in the respective consolidated statements of operations.

Accumulated Other Comprehensi49

Accumulated Other Comprehensive Loss of the Operating Partnership (Tables)	6 Months Ended
	Jun. 30, 2015
SL Green Operating Partnership
Accumulated Other Comprehensive Income (Loss) [Line Items]
Schedule of Accumulated Other Comprehensive Income (Loss)	The following tables set forth the changes in accumulated other comprehensive income (loss) by component as of June 30, 2015 (in thousands): Net unrealized (loss) gain on derivative instruments ( 1 ) SLGOP’s share of joint venture net unrealized (loss) gain on derivative instruments ( 2 ) Unrealized gain and (loss) on marketable securities Total Balance at December 31, 2014 $ (9,845 ) $ (100 ) $ 2,689 $ (7,256 ) Other comprehensive loss before reclassifications (8,616 ) (960 ) (654 ) (10,230 ) Amounts reclassified from accumulated other comprehensive income 5,484 662 — 6,146 Balance at June 30, 2015 $ (12,977 ) $ (398 ) $ 2,035 $ (11,340 ) ____________________________________________________________________ (1) Amount reclassified from accumulated other comprehensive income (loss) is included in interest expense in the respective consolidated statements of operations. As of June 30, 2015 and December 31, 2014, the deferred net losses from these terminated hedges, which is included in accumulated other comprehensive loss relating to net unrealized loss on derivative instrument, was $11.2 million and $12.2 million , respectively. (2) Amount reclassified from accumulated other comprehensive income (loss) is included in equity in net income from unconsolidated joint ventures in the respective consolidated statements of operations.

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	6 Months Ended
	Jun. 30, 2015
Fair Value Disclosures [Abstract]
Fair Value Measurements, Recurring and Nonrecurring	The following tables set forth the assets and liabilities that we measure at fair value on a recurring and non-recurring basis by their levels in the fair value hierarchy at June 30, 2015 and December 31, 2014 (in thousands): June 30, 2015 Total Level 1 Level 2 Level 3 Assets: Marketable securities $ 46,251 $ 4,070 $ 42,181 $ — Interest rate swap agreements (included in other assets) $ 23 $ — $ 23 $ — Liabilities: Interest rate swap agreements (included in accrued interest payable and other liabilities) $ 14,576 $ — $ 14,576 $ — December 31, 2014 Total Level 1 Level 2 Level 3 Assets: Marketable securities $ 39,429 $ 4,332 $ 35,097 $ — Interest rate swap agreements (included in other assets) $ 2,174 $ — $ 2,174 $ — Liabilities: Interest rate swap agreements (included in accrued interest payable and other liabilities) $ 14,728 $ — $ 14,728 $ —
Fair Value, by Balance Sheet Grouping	The following table provides the carrying value and fair value of these financial instruments as of June 30, 2015 and December 31, 2014 (in thousands): June 30, 2015 December 31, 2014 Carrying Value Fair Value Carrying Value Fair Value Debt and preferred equity investments $ 1,685,234 (1) $ 1,408,804 (1) Fixed rate debt $ 6,011,563 $ 6,419,286 $ 6,140,786 $ 6,565,236 Variable rate debt 2,364,421 2,412,488 2,291,943 2,315,952 $ 8,375,984 $ 8,831,774 $ 8,432,729 $ 8,881,188 ____________________________________________________________________ (1) At June 30, 2015 , debt and preferred equity investments had an estimated fair value ranging between $1.9 billion and $2.1 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_ Deriva51

Financial Instruments: Derivatives and Hedging (Tables)	6 Months Ended
	Jun. 30, 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 consolidated derivative financial instruments at June 30, 2015 based on Level 2 information. The notional value is an indication of the extent of our involvement in these instruments at that time, but does not represent exposure to credit, interest rate or market risks (amounts in thousands). Notional Value Strike Rate Effective Date Expiration Date Balance Sheet Location Fair Value Interest Rate Cap - Sold $ 504,000 4.750 % May 2014 May 2016 Other Liabilities $ — Interest Rate Cap 504,000 4.750 % May 2014 May 2016 Other Assets — Interest Rate Cap 500,000 4.750 % October 2014 May 2016 Other Liabilities — Interest Rate Cap - Sold 500,000 4.750 % November 2014 May 2016 Other Assets — Interest Rate Cap 446,000 4.750 % October 2014 May 2016 Other Liabilities — Interest Rate Cap 263,426 6.000 % November 2013 November 2015 Other Liabilities — Interest Rate Cap 137,500 4.000 % October 2013 September 2015 Other Liabilities — Interest Rate Swap 200,000 0.938 % October 2014 December 2017 Other Liabilities (133 ) Interest Rate Swap 150,000 0.940 % October 2014 December 2017 Other Liabilities (103 ) Interest Rate Swap 150,000 0.940 % October 2014 December 2017 Other Liabilities (103 ) Interest Rate Swap 144,000 2.236 % December 2012 December 2017 Other Liabilities (4,541 ) Interest Rate Swap 86,400 1.948 % December 2012 December 2017 Other Liabilities (2,123 ) Interest Rate Swap 72,000 2.310 % December 2012 December 2017 Other Liabilities (2,399 ) Interest Rate Swap 72,000 1.345 % December 2012 December 2017 Other Liabilities (725 ) Interest Rate Swap 72,000 2.310 % December 2012 December 2017 Other Liabilities (2,398 ) Interest Rate Swap 57,600 1.990 % December 2012 December 2017 Other Liabilities (1,474 ) Interest Rate Swap 30,000 2.295 % July 2010 June 2016 Other Liabilities (548 ) Interest Rate Swap 14,409 0.500 % January 2015 January 2017 Other Assets 23 Interest Rate Swap 8,018 0.852 % February 2015 February 2017 Other Liabilities (29 ) $ (14,553 )
Schedule of effect of derivative financial instruments on consolidated statements of income	The following table presents the effect of our derivative financial instruments and our share of our joint ventures' derivative financial instruments that are designated and qualify as hedging instruments on the consolidated statements of operations for the three months ended June 30, 2015 and 2014, respectively (in thousands): Amount of (Loss) Gain Recognized in Other Comprehensive Loss (Effective Portion) Location of (Loss) Reclassified from Accumulated Other Comprehensive Loss into Income Amount of Loss Reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion) Location of (Loss) or Gain Recognized in Income on Derivative Amount of (Loss) or Gain Recognized into Income (Ineffective Portion) Three Months Ended June 30, Three Months Ended June 30, Three Months Ended June 30, Derivative 2015 2014 2015 2014 2015 2014 Interest Rate Swaps/Caps $ (1,095 ) $ (465 ) Interest expense $ 2,737 $ 1,272 Interest expense $ (14 ) $ 1 Share of unconsolidated joint ventures' derivative instruments 277 5,930 Equity in net income from unconsolidated joint ventures 331 556 Equity in net income from unconsolidated joint ventures 16 — $ (818 ) $ 5,465 $ 3,068 $ 1,828 $ 2 $ 1 The following table presents the effect of our derivative financial instruments and our share of our joint ventures' derivative financial instruments that are designated and qualify as hedging instruments on the consolidated statements of operations for the six months ended June 30, 2015 and 2014, respectively (in thousands): Amount of (Loss) or Gain Location of(Loss) Reclassified from Accumulated Other Comprehensive Loss into Income Amount of Loss Location of (Loss) or Gain Recognized in Income on Derivative Amount of (Loss) or Gain Six Months Ended Six Months Ended Six Months Ended Derivative 2015 2014 2015 2014 2015 2014 Interest Rate Swaps/Caps $ (8,616 ) $ (516 ) Interest expense $ 5,484 $ 1,964 Interest expense $ (424 ) $ 2 Share of unconsolidated joint ventures' derivative instruments (960 ) 4,184 Equity in net income from unconsolidated joint ventures 662 1,829 Equity in net income from unconsolidated joint ventures — — $ (9,576 ) $ 3,668 $ 6,146 $ 3,793 $ (424 ) $ 2

Commitments and Contingencies (

Commitments and Contingencies (Tables)	6 Months Ended
	Jun. 30, 2015
Commitments and Contingencies Disclosure [Abstract]
Schedule of future minimum lease payments under capital leases and non cancellable operating leases	The following is a schedule of future minimum lease payments under capital leases and non-cancellable operating leases with initial terms in excess of one year as of June 30, 2015 (in thousands): Capital lease Non-cancellable operating leases Remaining 2015 $ 73 $ 15,247 2016 170 30,612 2017 291 30,845 2018 291 30,845 2019 315 30,862 Thereafter 56,568 720,698 Total minimum lease payments 57,708 $ 859,109 Less amount representing interest (36,695 ) Capital lease obligations $ 21,013

Segment Information (Tables)

Segment Information (Tables)	6 Months Ended
	Jun. 30, 2015
Segment Reporting [Abstract]
Schedule of selected results of operations and selected asset information	Selected results of operations for the three and six months ended June 30, 2015 and 2014, and selected asset information as of June 30, 2015 and December 31, 2014, regarding our operating segments are as follows (in thousands): Real Estate Segment Debt and Preferred Equity Segment Total Company Total revenues Three months ended: June 30, 2015 $ 363,883 $ 45,191 $ 409,074 June 30, 2014 340,918 39,714 380,632 Six months ended: June 30, 2015 $ 718,113 $ 87,260 $ 805,373 June 30, 2014 649,279 93,798 743,077 (Loss) income from continuing operations before equity in net gain on sale of interest in unconsolidated joint venture/real estate and purchase price fair value adjustment Three months ended: June 30, 2015 $ (65,677 ) $ 35,729 $ (29,948 ) June 30, 2014 23,069 33,993 57,062 Six months ended: June 30, 2015 $ (58,918 ) $ 71,196 $ 12,278 June 30, 2014 23,688 79,576 103,264 Total assets As of: June 30, 2015 $ 15,562,297 $ 1,704,661 $ 17,266,958 December 31, 2014 15,671,662 1,424,925 17,096,587
Schedule of reconciliation of income from continuing operations to net income attributable to SL Green common stockholders	The table below reconciles (loss) income from continuing operations to net (loss) income for the three and six months ended June 30, 2015 and 2014 (in thousands): Three Months Ended June 30, Six Months Ended June 30, 2015 2014 2015 2014 (Loss) income from continuing operations before equity in net gain on sale of interest in unconsolidated joint venture/real estate $ (29,948 ) $ 57,062 $ 12,278 $ 103,264 Equity in net gain on sale of interest in unconsolidated joint venture/real estate 769 1,444 769 106,084 Purchase price fair value adjustment — 71,446 — 71,446 (Loss) income from continuing operations (29,179 ) 129,952 13,047 280,794 Net income from discontinued operations — 5,645 427 11,414 Gain on sale of discontinued operations — 114,735 12,983 114,735 Net (loss) income $ (29,179 ) $ 250,332 $ 26,457 $ 406,943

Organization and Basis of Pre54

Organization and Basis of Presentation (Details) - SL Green Operating Partnership	Jun. 30, 2015	Dec. 31, 2014
Organization
Percentage of ownership in SL Green Management LLC owned by operating partnership (percent)	100.00%
Noncontrolling interest in the operating partnership (as a percent)	3.78%	3.92%
Service Corporation
Organization
Economic interest in variable interest entity (as a percent)	95.00%

Organization and Basis of Pre55

Organization and Basis of Presentation (Details 2) $ in Thousands	6 Months Ended
	Jun. 30, 2015USD ($)ft²propertybuildingshares	Dec. 31, 2014USD ($)
Real estate properties
Number of Properties | building	119
Approximate Square Feet (sqft)	34,875,769
Weighted Average Occupancy (as a percent)	89.70%
Carrying Value, Net of Discounts and Deferred Origination Fees | $	$ 1,685,234	$ 1,408,804
Number of shares to be received on redemption of one unit of limited partnership interests (shares) | shares	1
Office
Real estate properties
Number of properties held for sale | property	1
Retail
Real estate properties
Number of properties held for sale | property	2
Commercial properties
Real estate properties
Number of Properties | building	97
Approximate Square Feet (sqft)	31,999,838
Weighted Average Occupancy (as a percent)	89.10%
Residential
Real estate properties
Number of Properties | building	22
Approximate Square Feet (sqft)	2,875,931
Weighted Average Occupancy (as a percent)	96.30%
Managed office properties
Real estate properties
Approximate Square Feet (sqft)	336,201
Consolidated properties
Real estate properties
Number of Properties | building	77
Approximate Square Feet (sqft)	25,832,770
Consolidated properties | Commercial properties
Real estate properties
Number of Properties | building	72
Approximate Square Feet (sqft)	25,003,572
Consolidated properties | Residential
Real estate properties
Number of Properties | building	5
Approximate Square Feet (sqft)	829,198
Unconsolidated properties
Real estate properties
Number of Properties | building	42
Approximate Square Feet (sqft)	9,042,999
Unconsolidated properties | Commercial properties
Real estate properties
Number of Properties | building	25
Approximate Square Feet (sqft)	6,996,266
Unconsolidated properties | Residential
Real estate properties
Number of Properties | building	17
Approximate Square Feet (sqft)	2,046,733
Manhattan
Real estate properties
Number of Properties | building	61
Approximate Square Feet (sqft)	26,208,697
Weighted Average Occupancy (as a percent)	90.60%
Manhattan | Office
Real estate properties
Number of Properties | building	31
Approximate Square Feet (sqft)	22,009,160
Weighted Average Occupancy (as a percent)	96.90%
Manhattan | Retail
Real estate properties
Number of Properties | building	16
Approximate Square Feet (sqft)	683,363
Weighted Average Occupancy (as a percent)	91.90%
Manhattan | Development/Redevelopment
Real estate properties
Number of Properties | building	12
Approximate Square Feet (sqft)	2,732,644
Weighted Average Occupancy (as a percent)	36.90%
Manhattan | Fee Interest
Real estate properties
Number of Properties | building	2
Approximate Square Feet (sqft)	783,530
Weighted Average Occupancy (as a percent)	100.00%
Manhattan | Residential
Real estate properties
Number of Properties | building	21
Approximate Square Feet (sqft)	2,809,320
Weighted Average Occupancy (as a percent)	96.40%
Manhattan | Consolidated properties
Real estate properties
Number of Properties | building	42
Approximate Square Feet (sqft)	20,500,172
Manhattan | Consolidated properties | Office
Real estate properties
Number of Properties | building	24
Approximate Square Feet (sqft)	18,533,045
Manhattan | Consolidated properties | Retail
Real estate properties
Number of Properties | building	9
Approximate Square Feet (sqft)	403,735
Manhattan | Consolidated properties | Development/Redevelopment
Real estate properties
Number of Properties | building	7
Approximate Square Feet (sqft)	779,862
Manhattan | Consolidated properties | Fee Interest
Real estate properties
Number of Properties | building	2
Approximate Square Feet (sqft)	783,530
Manhattan | Consolidated properties | Residential
Real estate properties
Number of Properties | building	4
Approximate Square Feet (sqft)	762,587
Manhattan | Consolidated properties | Dual property type, retail portion
Real estate properties
Approximate Square Feet (sqft)	270,132
Manhattan | Consolidated properties | Dual property type, residential portion
Real estate properties
Approximate Square Feet (sqft)	222,855
Manhattan | Unconsolidated properties
Real estate properties
Number of Properties | building	19
Approximate Square Feet (sqft)	5,708,525
Manhattan | Unconsolidated properties | Office
Real estate properties
Number of Properties | building	7
Approximate Square Feet (sqft)	3,476,115
Manhattan | Unconsolidated properties | Retail
Real estate properties
Number of Properties | building	7
Approximate Square Feet (sqft)	279,628
Manhattan | Unconsolidated properties | Development/Redevelopment
Real estate properties
Number of Properties | building	5
Approximate Square Feet (sqft)	1,952,782
Manhattan | Unconsolidated properties | Fee Interest
Real estate properties
Number of Properties | building	0
Approximate Square Feet (sqft)	0
Manhattan | Unconsolidated properties | Residential
Real estate properties
Number of Properties | building	17
Approximate Square Feet (sqft)	2,046,733
Suburban
Real estate properties
Number of Properties | building	36
Approximate Square Feet (sqft)	5,791,141
Weighted Average Occupancy (as a percent)	82.10%
Suburban | Office
Real estate properties
Number of Properties | building	33
Approximate Square Feet (sqft)	5,738,141
Weighted Average Occupancy (as a percent)	81.90%
Suburban | Retail
Real estate properties
Number of Properties | building	1
Approximate Square Feet (sqft)	52,000
Weighted Average Occupancy (as a percent)	100.00%
Suburban | Development/Redevelopment
Real estate properties
Number of Properties | building	2
Approximate Square Feet (sqft)	1,000
Weighted Average Occupancy (as a percent)	100.00%
Suburban | Residential
Real estate properties
Number of Properties | building	1
Approximate Square Feet (sqft)	66,611
Weighted Average Occupancy (as a percent)	92.00%
Suburban | Consolidated properties
Real estate properties
Number of Properties | building	30
Approximate Square Feet (sqft)	4,503,400
Suburban | Consolidated properties | Office
Real estate properties
Number of Properties | building	28
Approximate Square Feet (sqft)	4,450,400
Suburban | Consolidated properties | Retail
Real estate properties
Number of Properties | building	1
Approximate Square Feet (sqft)	52,000
Suburban | Consolidated properties | Development/Redevelopment
Real estate properties
Number of Properties | building	1
Approximate Square Feet (sqft)	1,000
Suburban | Consolidated properties | Residential
Real estate properties
Number of Properties | building	1
Approximate Square Feet (sqft)	66,611
Suburban | Unconsolidated properties
Real estate properties
Number of Properties | building	6
Approximate Square Feet (sqft)	1,287,741
Suburban | Unconsolidated properties | Office
Real estate properties
Number of Properties | building	5
Approximate Square Feet (sqft)	1,287,741
Suburban | Unconsolidated properties | Retail
Real estate properties
Number of Properties | building	0
Approximate Square Feet (sqft)	0
Suburban | Unconsolidated properties | Development/Redevelopment
Real estate properties
Number of Properties | building	1
Approximate Square Feet (sqft)	0
Suburban | Unconsolidated properties | Residential
Real estate properties
Number of Properties | building	0
Approximate Square Feet (sqft)	0

Significant Accounting Polici56

Significant Accounting Policies (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Principles of Consolidation
Commercial real estate properties	$ 11,524,226	$ 12,163,976
Mortgages and other loans payable	5,287,934	5,586,709
Assets held for sale	420,569	462,430
Liabilities related to assets held for sale	178,252	266,873
Consolidated VIEs
Principles of Consolidation
Commercial real estate properties	199,600	198,400
Mortgages and other loans payable	$ 105,500	106,500
Commercial properties | Consolidated VIEs
Principles of Consolidation
Assets held for sale		445,000
Liabilities related to assets held for sale		$ 253,900

Significant Accounting Polici57

Significant Accounting Policies (Details 2) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Investment in Commercial Real Estate Properties
Increase in rental revenue from amortization of acquired leases	$ 8,300	$ 6,400	$ 22,600	$ 12,500
Reduction in interest expense from amortization of above-market rate mortgages	600	$ 1,300	1,200	$ 2,800
Identified intangible assets (included in other assets):
Gross amount	941,064		941,064		$ 664,297
Accumulated amortization	(399,103)		(399,103)		(383,236)
Net	541,961		541,961		281,061
Identified intangible liabilities (included in deferred revenue):
Gross amount	804,550		804,550		655,755
Accumulated amortization	(484,673)		(484,673)		(483,948)
Net	319,877		319,877		$ 171,807
Net intangible assets reclassed to assets held for sale	3,600		3,600
Net intangible liabilities reclassed to liabilities relates to assets held for sale	$ 8,300		$ 8,300
Above-market leases | Minimum
Investment in Commercial Real Estate Properties
Estimated useful life of other intangible assets (in years)			1 year
Above-market leases | Maximum
Investment in Commercial Real Estate Properties
Estimated useful life of other intangible assets (in years)			14 years
In-place leases | Minimum
Investment in Commercial Real Estate Properties
Estimated useful life of other intangible assets (in years)			1 year
In-place leases | Maximum
Investment in Commercial Real Estate Properties
Estimated useful life of other intangible assets (in years)			14 years
Building | Minimum
Investment in Commercial Real Estate Properties
Estimated useful life (in years)			3 years
Building | Maximum
Investment in Commercial Real Estate Properties
Estimated useful life (in years)			40 years

Significant Accounting Polici58

Significant Accounting Policies (Details 3) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Investment in Marketable Securities
Marketable securities	$ 46,251		$ 39,429
Net proceeds on sale of marketable securities	300	$ 3,600
Mortgage-backed securities
Investment in Marketable Securities
Cost basis	39,900		32,400
Level 1 | Equity Securities
Investment in Marketable Securities
Marketable securities	4,070		4,332
Level 2 | Mortgage-backed securities
Investment in Marketable Securities
Marketable securities	42,181		35,097
Fair Value
Investment in Marketable Securities
Marketable securities	$ 46,251		$ 39,429

Significant Accounting Polici59

Significant Accounting Policies (Details 4) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Accounting Policies [Abstract]
Days past due for income recognition on debt and preferred equity investments to be suspended			90 days
Income taxes
Federal, state and local tax provision	$ 1.1	$ 2.1	$ 1.4	$ 5

Significant Accounting Polici60

Significant Accounting Policies (Details 5) - Jun. 30, 2015 - Annualized rent - Customer concentration - Tenant	Total	Total
Concentration of Credit Risk
Number of tenants (tenants)		3
Maximum percentage of annualized rent for any one tenant not individually disclosed (percent) (more than)	2.00%	2.00%
1515 Broadway
Concentration of Credit Risk
Percentage of concentration (percent)	10.10%
388-390 Greenwich Street
Concentration of Credit Risk
Percentage of concentration (percent)	9.50%
919 Third Avenue
Concentration of Credit Risk
Percentage of concentration (percent)	7.80%
1185 Avenue of the Americas
Concentration of Credit Risk
Percentage of concentration (percent)	7.50%
Tenant 1
Concentration of Credit Risk
Percentage of concentration (percent)		10.50%
Tenant 2
Concentration of Credit Risk
Percentage of concentration (percent)		6.50%
Tenant 3
Concentration of Credit Risk
Percentage of concentration (percent)		5.30%

Property Acquisitions (Details)

Property Acquisitions (Details) - USD ($) $ in Thousands	May. 15, 2014	May. 14, 2014	Jun. 30, 2015	Mar. 31, 2015	Oct. 31, 2014	Jul. 31, 2014	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Recognized Identifiable Assets Acquired and Liabilities Assumed
Impact to rental revenue for amortization of aggregate below-market leases							$ 304,226	$ 279,608	$ 607,555	$ 535,584
Impact to depreciation expense							199,565	$ 93,379	307,902	$ 179,894
Total fixed rate debt			$ 4,601,513				4,601,513		4,601,513		$ 4,736,709
Upper East Side Residential
Recognized Identifiable Assets Acquired and Liabilities Assumed
Land			17,500				17,500		17,500
Building and building leasehold			32,500				32,500		32,500
Above market lease value			0				0		0
Acquired in-place leases			0				0		0
Other assets, net of other liabilities			0				0		0
Assets acquired			50,000				50,000		50,000
Mark-to-market assumed debt			0				0		0
Below market lease value			0				0		0
Derivatives			0				0		0
Liabilities assumed			0				0		0
Purchase price			50,000				$ 50,000		$ 50,000
Net consideration funded by us at closing, excluding consideration financed by debt			50,000
Equity and/or debt investment held			0
Debt assumed			$ 0
Ownership interest in consolidated joint venture (as a percent)			95.10%				95.10%		95.10%
Upper East Side Residential | Series N Preferred Units
Recognized Identifiable Assets Acquired and Liabilities Assumed
Issuance of aggregate liquidation preference of preferred units			$ 13,800				$ 13,800		$ 13,800
1640 Flatbush Avenue
Recognized Identifiable Assets Acquired and Liabilities Assumed
Land				$ 6,120
Building and building leasehold				680
Above market lease value				0
Acquired in-place leases				0
Other assets, net of other liabilities				0
Assets acquired				6,800
Mark-to-market assumed debt				0
Below market lease value				0
Derivatives				0
Liabilities assumed				0
Purchase price				6,800
Net consideration funded by us at closing, excluding consideration financed by debt				6,800
Equity and/or debt investment held				0
Debt assumed				$ 0
102 Greene Street
Recognized Identifiable Assets Acquired and Liabilities Assumed
Land					$ 8,215
Building and building leasehold					26,717
Above market lease value					0
Acquired in-place leases					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
Derivatives					0
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
102 Greene Street | Scenario, Previously Reported
Recognized Identifiable Assets Acquired and Liabilities Assumed
Land					11,300
Building and building leasehold					21,000
719 Seventh Avenue
Recognized Identifiable Assets Acquired and Liabilities Assumed
Land						$ 41,850
Building and building leasehold						0
Above market lease value						0
Acquired in-place leases						0
Other assets, net of other liabilities						0
Assets acquired						41,850
Mark-to-market assumed debt						0
Below market lease value						0
Derivatives						0
Liabilities assumed						0
Purchase price						41,850
Net consideration funded by us at closing, excluding consideration financed by debt						41,850
Equity and/or debt investment held						0
Debt assumed						$ 0
Ownership interest in consolidated joint venture (as a percent)						75.00%
719 Seventh Avenue | Series L Preferred Units
Recognized Identifiable Assets Acquired and Liabilities Assumed
Issuance of aggregate liquidation preference of preferred units						$ 14,100
719 Seventh Avenue | Series K Preferred Units
Recognized Identifiable Assets Acquired and Liabilities Assumed
Issuance of aggregate liquidation preference of preferred units						9,500
719 Seventh Avenue | Scenario, Previously Reported
Recognized Identifiable Assets Acquired and Liabilities Assumed
Land						14,400
Building and building leasehold						26,700
115 Spring Street
Recognized Identifiable Assets Acquired and Liabilities Assumed
Land						11,078
Building and building leasehold						44,799
Above market lease value						0
Acquired in-place leases						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
Derivatives						0
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
115 Spring Street | Scenario, Previously Reported
Recognized Identifiable Assets Acquired and Liabilities Assumed
Land						15,900
Building and building leasehold						$ 37,200
388-390 Greenwich Street
Recognized Identifiable Assets Acquired and Liabilities Assumed
Land	$ 516,292
Building and building leasehold	964,434
Above market lease value	0
Acquired in-place leases	302,430
Other assets, net of other liabilities	6,495
Assets acquired	1,789,651
Mark-to-market assumed debt	0
Below market lease value	186,782
Derivatives	18,001
Liabilities assumed	204,783
Purchase price	1,584,868	$ 1,585,000
Net consideration funded by us at closing, excluding consideration financed by debt	208,614	208,614
Equity and/or debt investment held	148,025	148,025
Debt assumed	$ 1,162,379	1,162,379
Economic interest (as a percent)	49.65%
Value of interest	$ 1,585,000
Face amount of loan	1,450,000
Notional value	504,000
Total fixed rate debt					$ 500,000
Purchase price fair value adjustment	71,400	$ 71,446
388-390 Greenwich Street | Scenario, Previously Reported
Recognized Identifiable Assets Acquired and Liabilities Assumed
Land	558,700
Building and building leasehold	$ 1,000,000
102 Greene Street, 719 Seventh Avenue, 115 Spring Street and 388-390 Greenwich Street [Member] [Member]
Recognized Identifiable Assets Acquired and Liabilities Assumed
Impact to rental revenue for amortization of aggregate below-market leases									6,800
Impact to depreciation expense									$ 10,100

Property Acquisitions - Schedul

Property Acquisitions - Schedule of Fair Value of Equity Interest Immediately Before Acquisition Date (Details) - 388-390 Greenwich Street - USD ($) $ in Thousands	May. 15, 2014	May. 14, 2014
Property Acquisitions
Contract purchase price	$ 1,584,868	$ 1,585,000
Net consideration funded by us at closing, excluding consideration financed by debt	(208,614)	(208,614)
Debt assumed	(1,162,379)	(1,162,379)
Fair value of retained equity interest		214,007
Equity and/or debt investment held	(148,025)	(148,025)
Other		5,464
Purchase price fair value adjustment	$ 71,400	$ 71,446

Properties Held for Sale and 63

Properties Held for Sale and Property Dispositions - Properties Held for Sale (Details) - Jun. 30, 2015 $ in Millions	USD ($)agreement
120 West 45th Street and 131-137 Spring Street
Property Dispositions and Assets Held for Sale
Number of agreements to sell properties | agreement	2
120 West 45th Street
Property Dispositions and Assets Held for Sale
Agreed sale consideration	$ 365
131-137 Spring Street
Property Dispositions and Assets Held for Sale
Ownership percentage in disposed asset	80.00%
Gross asset valuation of disposed asset	$ 277.8

Properties Held for Sale and 64

Properties Held for Sale and Property Dispositions - Property Dispositions (Details) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended
	Jan. 31, 2015USD ($)ft²	Jun. 30, 2015USD ($)ft²	Jun. 30, 2014USD ($)	Jun. 30, 2015USD ($)ft²	Jun. 30, 2014USD ($)
Properties Sold [Abstract]
Approximate Usable Square Feet (sqft) | ft²		34,875,769		34,875,769
Gain on Sale		$ 0	$ 114,735	$ 12,983	$ 114,735
Revenues
Rental revenue		0	13,993	236	35,172
Escalation and reimbursement revenues		0	1,211	(127)	4,609
Other income		0	17	0	20
Total revenues		0	15,221	109	39,801
Operating expenses		0	1,868	(631)	6,329
Real estate taxes		0	1,846	250	5,831
Ground rent		0	805	0	3,001
Transaction related costs		0	40	(49)	40
Interest expense, net of interest income		0	3,448	109	8,109
Amortization of deferred financing costs		0	110	3	321
Depreciation and amortization		0	1,459	0	4,756
Total expenses		0	9,576	(318)	28,387
Net income from discontinued operations		$ 0	$ 5,645	$ 427	$ 11,414
180 Maiden Lane
Properties Sold [Abstract]
Approximate Usable Square Feet (sqft) | ft²	1,090,000
Sales Price	$ 470,000
Gain on Sale	17,000
Employee compensation award	$ 800

Debt and Preferred Equity Inv65

Debt and Preferred Equity Investments (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	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	$ 386,200	$ 303,400
Decrease in debt and preferred equity investments (net of discounts), including investments classified as held-for-sale	$ 109,800	$ 60,400
Aggregate weighted average current yield (as a percent)	10.15%
Debt Investments Held [Abstract]
Carrying Value, Net of Discounts and Deferred Origination Fees	$ 1,685,234		$ 1,408,804
Debt investment
Debt Investments Held [Abstract]
Future Funding Obligations	135,699
Senior Financing	5,582,034
Carrying Value, Net of Discounts and Deferred Origination Fees	1,516,295		1,275,809
Total fixed rate
Debt Investments Held [Abstract]
Future Funding Obligations	5,663
Senior Financing	2,853,100
Carrying Value, Net of Discounts and Deferred Origination Fees	572,918		582,174
Total fixed rate | Junior Mortgage Participation/Mezzanine Loan, February 2016
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	205,000
Carrying Value, Net of Discounts and Deferred Origination Fees	71,909		70,688
Total fixed rate | Junior Mortgage Participation/Mezzanine Loan, Various
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	0
Carrying Value, Net of Discounts and Deferred Origination Fees	46,136		45,611
Total fixed rate | Junior Mortgage Participation, June 2016
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	133,000
Carrying Value, Net of Discounts and Deferred Origination Fees	49,000		49,000
Total fixed rate | Mezzanine Loan, November 2016
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	165,000
Carrying Value, Net of Discounts and Deferred Origination Fees	71,962		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, Net of Discounts and Deferred Origination Fees	102,646		98,934
Total fixed rate | Mezzanine Loan, March 2017
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	0
Carrying Value, Net of Discounts and Deferred Origination Fees	65,969		65,770
Total fixed rate | Mezzanine Loan, June 2017
Debt Investments Held [Abstract]
Future Funding Obligations	5,663
Senior Financing	502,100
Carrying Value, Net of Discounts and Deferred Origination Fees	35,409		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, Net of Discounts and Deferred Origination Fees	49,643		49,629
Total fixed rate | Mortgage Loan, February 2019
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	0
Carrying Value, Net of Discounts and Deferred Origination Fees	26,235		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, Net of Discounts and Deferred Origination Fees	576		637
Total fixed rate | Mezzanine Loan, September 2021
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	15,000
Carrying Value, Net of Discounts and Deferred Origination Fees	3,500		3,500
Total fixed rate | Mezzanine Loan, November 2023
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	90,000
Carrying Value, Net of Discounts and Deferred Origination Fees	19,933		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, Net of Discounts and Deferred Origination Fees	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, Net of Discounts and Deferred Origination Fees	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, Net of Discounts and Deferred Origination Fees	0		11,934
Total fixed rate | Junior Mortgage Participation, Sold July 2015
Debt Investments Held [Abstract]
Carrying amount of Notes	22,900
Total fixed rate | Mezzanine Loan, May 2016
Debt Investments Held [Abstract]
Carrying amount of Notes	23,200
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	130,036
Senior Financing	2,728,934
Carrying Value, Net of Discounts and Deferred Origination Fees	943,377		693,635
Total floating rate | Mezzanine Loan, November 2016
Debt Investments Held [Abstract]
Future Funding Obligations	11,364
Senior Financing	296,966
Carrying Value, Net of Discounts and Deferred Origination Fees	62,615		0
Total floating rate | Mezzanine Loan, September 2015
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	110,000
Carrying Value, Net of Discounts and Deferred Origination Fees	49,882		49,614
Total floating rate | Mezzanine Loan, March 2016
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	775,000
Carrying Value, Net of Discounts and Deferred Origination Fees	74,014		73,402
Total floating rate | Mortgage/Mezzanine Loan, April 2016
Debt Investments Held [Abstract]
Future Funding Obligations	18,906
Senior Financing	0
Carrying Value, Net of Discounts and Deferred Origination Fees	77,447		0
Total floating rate | Mortgage/Mezzanine Loan, June 2016
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	0
Carrying Value, Net of Discounts and Deferred Origination Fees	109,910		109,527
Total floating rate | Mezzanine Loan, June 2016
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	160,000
Carrying Value, Net of Discounts and Deferred Origination Fees	22,599		22,573
Amount participated out	7,400
Total floating rate | Mezzanine Loan, July 2016
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	115,000
Carrying Value, Net of Discounts and Deferred Origination Fees	24,913		24,910
Total floating rate | Mezzanine Loan, November 2016
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	360,000
Carrying Value, Net of Discounts and Deferred Origination Fees	99,269		99,023
Total floating rate | Mezzanine Loan, December 2016
Debt Investments Held [Abstract]
Future Funding Obligations	15,009
Senior Financing	123,343
Carrying Value, Net of Discounts and Deferred Origination Fees	46,050		42,750
Total floating rate | Mezzanine Loan, December 2016
Debt Investments Held [Abstract]
Future Funding Obligations	553
Senior Financing	38,423
Carrying Value, Net of Discounts and Deferred Origination Fees	13,434		11,835
Total floating rate | Mortgage/Mezzanine Loan, January 2017
Debt Investments Held [Abstract]
Future Funding Obligations	72,842
Senior Financing	0
Carrying Value, Net of Discounts and Deferred Origination Fees	117,999		0
Amount participated out	25,000
Total floating rate | Mezzanine Loan, January 2017
Debt Investments Held [Abstract]
Future Funding Obligations	8,466
Senior Financing	92,705
Carrying Value, Net of Discounts and Deferred Origination Fees	21,306		20,651
Total floating rate | Jr. Mortgage Participation/Mezzanine Loan, July 2017
Debt Investments Held [Abstract]
Future Funding Obligations	2,101
Senior Financing	114,497
Carrying Value, Net of Discounts and Deferred Origination Fees	39,383		38,524
Total floating rate | Mortgage/Mezzanine Loan, July 2017
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	0
Carrying Value, Net of Discounts and Deferred Origination Fees	22,840		22,803
Total floating rate | Mortgage/Mezzanine Loan, September 2017
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	0
Carrying Value, Net of Discounts and Deferred Origination Fees	16,874		16,848
Total floating rate | Mezzanine Loan, November 2017
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	60,000
Carrying Value, Net of Discounts and Deferred Origination Fees	14,880		14,859
Total floating rate | Mortgage Mezzanine Loan, December 2017
Debt Investments Held [Abstract]
Future Funding Obligations	795
Senior Financing	0
Carrying Value, Net of Discounts and Deferred Origination Fees	14,892		14,845
Amount participated out	5,100
Total floating rate | Junior Mortgage Participation Loan, April 2018
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	40,000
Carrying Value, Net of Discounts and Deferred Origination Fees	19,815		0
Total floating rate | Mezzanine Loan, April 2018
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	350,000
Carrying Value, Net of Discounts and Deferred Origination Fees	34,671		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, Net of Discounts and Deferred Origination Fees	20,522		20,533
Total floating rate | Mortgage Mezzanine Loan, February 2019
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	0
Carrying Value, Net of Discounts and Deferred Origination Fees	18,237		18,083
Total floating rate | Mezzanine Loan, March 2019
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	38,000
Carrying Value, Net of Discounts and Deferred Origination Fees	21,825		21,807
Total floating rate | Mezzanine Loan, Repaid April 2015
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	0
Carrying Value, Net of Discounts and Deferred Origination Fees	0		33,726
Total floating rate | Mezzanine Loan, Repaid April 2015
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	0
Carrying Value, Net of Discounts and Deferred Origination Fees	$ 0		$ 37,322

Debt and Preferred Equity Inv66

Debt and Preferred Equity Investments (Details 2) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Preferred equity investment
Aggregate weighted average current yield (as a percent)	10.15%
Carrying Value, Net of Discounts and Deferred Origination Fees	$ 1,685,234	$ 1,408,804
Preferred equity investments
Preferred equity investment
Aggregate weighted average current yield (as a percent)	10.18%
Future Funding Obligations	$ 5,580
Senior Financing	680,795
Carrying Value, Net of Discounts and Deferred Origination Fees	168,939	132,995
Preferred Equity, Redeemed July 2015
Preferred equity investment
Future Funding Obligations	0
Senior Financing	550,000
Carrying Value, Net of Discounts and Deferred Origination Fees	126,817	123,041
Preferred Equity, March 2018
Preferred equity investment
Future Funding Obligations	0
Senior Financing	70,000
Carrying Value, Net of Discounts and Deferred Origination Fees	9,960	9,954
Preferred Equity, November 2018
Preferred equity investment
Future Funding Obligations	5,580
Senior Financing	60,795
Carrying Value, Net of Discounts and Deferred Origination Fees	$ 32,162	$ 0

Debt and Preferred Equity Inv67

Debt and Preferred Equity Investments (Details 3) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2015USD ($)segment	Dec. 31, 2014USD ($)segment
Investments, Debt and Equity Securities [Abstract]
Number of portfolio segments of financial receivables (segment)	1	1
Additional amount of financing receivables included in other assets | $	$ 111.5	$ 133.5

Investments in Unconsolidated68

Investments in Unconsolidated Joint Ventures (Details) $ in Thousands	1 Months Ended
	Jun. 30, 2015USD ($)ft²unit	Mar. 31, 2015USD ($)	Feb. 28, 2015USD ($)property	Dec. 31, 2014USD ($)
General information on each joint venture
Net equity investment in VIEs in which the entity is not primary beneficiary	$ 98,300			$ 146,200
Approximate Square Feet (sqft) | ft²	34,875,769
Loans Receivable, Gross, Commercial, Acquisition	$ 145,690			145,875
100 Park Avenue
General information on each joint venture
Ownership Percentage	49.90%
Economic Interest (as a percent)	49.90%
Approximate Square Feet (sqft) | ft²	834,000
Acquisition Price	$ 95,800
717 Fifth Avenue
General information on each joint venture
Ownership Percentage	10.92%
Economic Interest (as a percent)	10.92%
Approximate Square Feet (sqft) | ft²	119,500
Acquisition Price	$ 251,900
800 Third Avenue
General information on each joint venture
Ownership Percentage	60.52%
Economic Interest (as a percent)	60.52%
Approximate Square Feet (sqft) | ft²	526,000
Acquisition Price	$ 285,000
Additional Ownership Percentage Acquired		17.56%
Additional Cost for additional interest in joint venture		$ 67,500
1745 Broadway
General information on each joint venture
Ownership Percentage	56.88%
Economic Interest (as a percent)	56.88%
Approximate Square Feet (sqft) | ft²	674,000
Acquisition Price	$ 520,000
Jericho Plaza
General information on each joint venture
Ownership Percentage	20.26%
Economic Interest (as a percent)	20.26%
Approximate Square Feet (sqft) | ft²	640,000
Acquisition Price	$ 210,000
The Meadows
General information on each joint venture
Ownership Percentage	50.00%
Economic Interest (as a percent)	50.00%
Approximate Square Feet (sqft) | ft²	582,100
Acquisition Price	$ 111,500
Agreed sale consideration	$ 121,100
600 Lexington Avenue
General information on each joint venture
Ownership Percentage	55.00%
Economic Interest (as a percent)	55.00%
Approximate Square Feet (sqft) | ft²	303,515
Acquisition Price	$ 193,000
11 West 34th Street
General information on each joint venture
Ownership Percentage	30.00%
Economic Interest (as a percent)	30.00%
Approximate Square Feet (sqft) | ft²	17,150
Acquisition Price	$ 10,800
7 Renaissance
General information on each joint venture
Ownership Percentage	50.00%
Economic Interest (as a percent)	50.00%
Approximate Square Feet (sqft) | ft²	65,641
Acquisition Price	$ 4,000
3 Columbus Circle
General information on each joint venture
Ownership Percentage	48.90%
Economic Interest (as a percent)	48.90%
Approximate Square Feet (sqft) | ft²	741,500
Acquisition Price	$ 500,000
280 Park Avenue
General information on each joint venture
Ownership Percentage	50.00%
Economic Interest (as a percent)	50.00%
Approximate Square Feet (sqft) | ft²	1,219,158
Acquisition Price	$ 400,000
1552-1560 Broadway
General information on each joint venture
Ownership Percentage	50.00%
Economic Interest (as a percent)	50.00%
Approximate Square Feet (sqft) | ft²	35,897
Acquisition Price	$ 136,550
724 Fifth Avenue
General information on each joint venture
Ownership Percentage	50.00%
Economic Interest (as a percent)	50.00%
Approximate Square Feet (sqft) | ft²	65,040
Acquisition Price	$ 223,000
10 East 53rd Street
General information on each joint venture
Ownership Percentage	55.00%
Economic Interest (as a percent)	55.00%
Approximate Square Feet (sqft) | ft²	354,300
Acquisition Price	$ 252,500
33 Beekman
General information on each joint venture
Ownership Percentage	45.90%
Economic Interest (as a percent)	45.90%
Approximate Square Feet (sqft) | ft²	0
Acquisition Price	$ 31,000
521 Fifth Avenue
General information on each joint venture
Ownership Percentage	50.50%
Economic Interest (as a percent)	50.50%
Approximate Square Feet (sqft) | ft²	460,000
Acquisition Price	$ 315,000
21 East 66th Street
General information on each joint venture
Ownership Percentage	32.28%
Economic Interest (as a percent)	32.28%
Approximate Square Feet (sqft) | ft²	16,736
Acquisition Price	$ 75,000
315 West 36th Street
General information on each joint venture
Ownership Percentage	35.50%
Economic Interest (as a percent)	35.50%
Approximate Square Feet (sqft) | ft²	147,619
Acquisition Price	$ 45,000
650 Fifth Avenue
General information on each joint venture
Ownership Percentage	50.00%
Economic Interest (as a percent)	50.00%
Approximate Square Feet (sqft) | ft²	32,324
Acquisition Price	$ 0
121 Greene Street
General information on each joint venture
Ownership Percentage	50.00%
Economic Interest (as a percent)	50.00%
Approximate Square Feet (sqft) | ft²	7,131
Acquisition Price	$ 27,400
175-225 Third Street
General information on each joint venture
Ownership Percentage	95.00%
Economic Interest (as a percent)	95.00%
Approximate Square Feet (sqft) | ft²	0
Acquisition Price	$ 74,600
55 West 46th Street
General information on each joint venture
Ownership Percentage	25.00%
Economic Interest (as a percent)	25.00%
Approximate Square Feet (sqft) | ft²	347,000
Acquisition Price	$ 295,000
Stonehenge Portfolio
General information on each joint venture
Approximate Square Feet (sqft) | ft²	2,046,733
Acquisition Price	$ 36,668		$ 40,200
Increase in real estate investment ownership interest			$ 3,500
Number of Joint Venture Properties with an Increased Ownership Interest | property			6
1552 Broadway
General information on each joint venture
Approximate Square Feet (sqft) | ft²	13,045
Three Retail and Two Residential Units | 21 East 66th Street
General information on each joint venture
Ownership Percentage	32.28%
Number of Stores | unit	3
Number Of Residential Units | unit	2
Three Residential Units | 21 East 66th Street
General information on each joint venture
Ownership Percentage	16.14%
Number Of Residential Units | unit	3
Series M Preferred Units
General information on each joint venture
Preferred Units (as a percent)			3.75%
Series M Preferred Units | Stonehenge Portfolio
General information on each joint venture
Issuance of aggregate liquidation preference of preferred units			$ 40,000
Mezzanine loan and preferred equity due March 2016
General information on each joint venture
Loans Receivable, Gross, Commercial, Acquisition	$ 99,777			99,629
Mezzanine loan due February 2022
General information on each joint venture
Loans Receivable, Gross, Commercial, Acquisition	$ 45,913			$ 46,246

Investments in Unconsolidated69

Investments in Unconsolidated Joint Ventures (Details 2) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended
	Mar. 31, 2015	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Debt Instrument [Line Items]
Total fixed rate debt		$ 4,601,513		$ 4,601,513		$ 4,736,709
Total floating rate debt		856,421		856,421		1,103,942
Total fixed rate and floating rate debt		5,457,934		5,457,934		5,840,651
Loss on early extinguishment of debt	$ (800)	0	$ (1,028)	(49)	$ (1,025)
1745 Broadway
Debt Instrument [Line Items]
Total fixed rate debt		16,000		16,000		16,000
Joint venture
Debt Instrument [Line Items]
Total fixed rate debt		2,851,964		2,851,964		2,065,264
Total floating rate debt		1,508,384		1,508,384		1,713,440
Total fixed rate and floating rate debt		4,360,348		4,360,348		3,778,704
Maximum amount of loan recourse to entity		18,400		18,400
Joint venture | 7 Renaissance
Debt Instrument [Line Items]
Total fixed rate debt		2,600		2,600		2,147
Joint venture | 11 West 34th Street
Debt Instrument [Line Items]
Total fixed rate debt		16,749		16,749		16,905
Joint venture | 280 Park Avenue
Debt Instrument [Line Items]
Total fixed rate debt		696,563		696,563		700,171
Joint venture | 1745 Broadway
Debt Instrument [Line Items]
Total fixed rate debt		340,000		340,000		340,000
Joint venture | Jericho Plaza
Debt Instrument [Line Items]
Total fixed rate debt		163,750		163,750		163,750
Joint venture | 800 Third Avenue
Debt Instrument [Line Items]
Total fixed rate debt		20,910		20,910		20,910
Joint venture | 315 West 36th Street
Debt Instrument [Line Items]
Total fixed rate debt		25,000		25,000		25,000
Joint venture | 521 Fifth Avenue
Debt Instrument [Line Items]
Total fixed rate debt		170,000		170,000		170,000
Joint venture | 717 Fifth Avenue | Mortgage loan
Debt Instrument [Line Items]
Committed amount		300,000		300,000
Joint venture | 717 Fifth Avenue | Mezzanine loans
Debt Instrument [Line Items]
Committed amount		290,000		290,000
Joint venture | 21 East 66th Street
Debt Instrument [Line Items]
Total fixed rate debt		12,000		12,000		12,000
Total floating rate debt		1,844		1,844		1,883
Joint venture | 3 Columbus Circle
Debt Instrument [Line Items]
Total fixed rate debt		350,000		350,000		0
Total floating rate debt		0		0		230,974
Joint venture | Stonehenge Portfolio
Debt Instrument [Line Items]
Total fixed rate debt		434,492		434,492		0
Total floating rate debt		10,500		10,500		0
Joint venture | The Meadows
Debt Instrument [Line Items]
Total floating rate debt		67,350		67,350		67,350
Joint venture | 1552 Broadway
Debt Instrument [Line Items]
Total floating rate debt		188,410		188,410		184,210
Joint venture | 1552 Broadway | Mortgage loan
Debt Instrument [Line Items]
Committed amount		150,000		150,000
Unfunded amount		1,700		1,700
Joint venture | 1552 Broadway | Mezzanine loans
Debt Instrument [Line Items]
Committed amount		41,500		41,500
Unfunded amount		1,400		1,400
Joint venture | Other loan payable
Debt Instrument [Line Items]
Total floating rate debt		30,000		30,000		30,000
Joint venture | 650 Fifth Avenue
Debt Instrument [Line Items]
Total floating rate debt		65,000		65,000		65,000
Joint venture | 650 Fifth Avenue | Mortgage loan
Debt Instrument [Line Items]
Committed amount		97,000		97,000
Unfunded amount		32,000		32,000
Joint venture | 175-225 Third Street
Debt Instrument [Line Items]
Total floating rate debt		40,000		40,000		40,000
Joint venture | 10 East 53rd Street
Debt Instrument [Line Items]
Total floating rate debt		125,000		125,000		125,000
Joint venture | 724 Fifth Avenue
Debt Instrument [Line Items]
Total floating rate debt		275,000		275,000		275,000
Joint venture | 33 Beekman
Debt Instrument [Line Items]
Total floating rate debt		65,506		65,506		52,283
Maximum amount of loan recourse to entity		75,000		75,000
Joint venture | 600 Lexington Avenue
Debt Instrument [Line Items]
Total floating rate debt		114,774		114,774		116,740
Joint venture | 55 West 46th Street
Debt Instrument [Line Items]
Total floating rate debt		150,000		150,000		150,000
Joint venture | 55 West 46th Street | Mortgage loan
Debt Instrument [Line Items]
Committed amount		190,000		190,000
Unfunded amount		40,000		40,000
Joint venture | 121 Greene Street
Debt Instrument [Line Items]
Total floating rate debt		15,000		15,000		15,000
Joint venture | 100 Park Avenue
Debt Instrument [Line Items]
Total floating rate debt		360,000		360,000		360,000
Initial Maturity July 2022 | Joint venture | 717 Fifth Avenue
Debt Instrument [Line Items]
Total fixed rate debt		300,000		300,000		300,000
Initial Maturity July 2024 | Joint venture | 717 Fifth Avenue
Debt Instrument [Line Items]
Total fixed rate debt		319,900		319,900		$ 314,381
Initial Maturity July 2016 | Joint venture | Stonehenge Portfolio
Debt Instrument [Line Items]
Total fixed rate debt		13,500		13,500
Initial Maturity June 2017 | Joint venture | Stonehenge Portfolio
Debt Instrument [Line Items]
Total fixed rate debt		56,000		56,000
Initial Maturity November 2017 | Joint venture | Stonehenge Portfolio
Debt Instrument [Line Items]
Total fixed rate debt		35,000		35,000
Initial Maturity February 2018 | Joint venture | Stonehenge Portfolio
Debt Instrument [Line Items]
Total fixed rate debt		7,400		7,400
Initial Maturity August 2019 | Joint venture | Stonehenge Portfolio
Debt Instrument [Line Items]
Total fixed rate debt		142,700		142,700
Initial Maturity June 2024 | Joint venture | Stonehenge Portfolio
Debt Instrument [Line Items]
Total fixed rate debt		$ 179,900		$ 179,900
Weighted Average | 1745 Broadway
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)		4.81%		4.81%
Weighted Average | Joint venture | 7 Renaissance
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)		10.00%		10.00%
Weighted Average | Joint venture | 11 West 34th Street
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)		4.82%		4.82%
Weighted Average | Joint venture | 280 Park Avenue
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)		6.57%		6.57%
Weighted Average | Joint venture | 1745 Broadway
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)		5.68%		5.68%
Weighted Average | Joint venture | Jericho Plaza
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)		5.65%		5.65%
Weighted Average | Joint venture | 800 Third Avenue
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)		6.00%		6.00%
Weighted Average | Joint venture | 315 West 36th Street
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)		3.16%		3.16%
Weighted Average | Joint venture | 521 Fifth Avenue
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)		3.73%		3.73%
Weighted Average | Joint venture | 21 East 66th Street
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)		3.60%		3.60%
Interest rate, floating rate debt (as a percent)		2.88%		2.88%
Weighted Average | Joint venture | 3 Columbus Circle
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)		3.61%		3.61%
Weighted Average | Joint venture | Stonehenge Portfolio
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)		4.18%		4.18%
Interest rate, floating rate debt (as a percent)		3.25%		3.25%
Weighted Average | Joint venture | The Meadows
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)		7.75%		7.75%
Weighted Average | Joint venture | 1552 Broadway
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)		4.26%		4.26%
Weighted Average | Joint venture | Other loan payable
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)		1.08%		1.08%
Weighted Average | Joint venture | 650 Fifth Avenue
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)		3.69%		3.69%
Weighted Average | Joint venture | 175-225 Third Street
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)		4.25%		4.25%
Weighted Average | Joint venture | 10 East 53rd Street
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)		2.69%		2.69%
Weighted Average | Joint venture | 724 Fifth Avenue
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)		2.60%		2.60%
Weighted Average | Joint venture | 33 Beekman
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)		2.93%		2.93%
Weighted Average | Joint venture | 600 Lexington Avenue
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)		2.28%		2.28%
Weighted Average | Joint venture | 55 West 46th Street
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)		2.49%		2.49%
Weighted Average | Joint venture | 121 Greene Street
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)		1.69%		1.69%
Weighted Average | Joint venture | 100 Park Avenue
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)		1.94%		1.94%
Weighted Average | Initial Maturity July 2022 | Joint venture | 717 Fifth Avenue
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)		4.45%		4.45%
Weighted Average | Initial Maturity July 2024 | Joint venture | 717 Fifth Avenue
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)		9.00%		9.00%

Investments in Unconsolidated70

Investments in Unconsolidated Joint Ventures (Details 3) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Assets
Commercial real estate property, net	$ 11,524,226		$ 11,524,226		$ 12,163,976
Other assets	1,144,720		1,144,720		647,333
Liabilities and members' equity
Mortgages and other loans payable	5,287,934		5,287,934		5,586,709
Company's investments in unconsolidated joint ventures	1,262,723		1,262,723		1,172,020
Combined statements of income for the unconsolidated joint ventures
Operating expenses	70,114	$ 69,098	146,891	$ 139,010
Ground rent	8,086	8,040	16,274	16,073
Real estate taxes	56,286	51,804	112,009	104,154
Interest expense, net of interest income	75,746	77,870	151,553	154,048
Amortization of deferred financing costs	5,952	5,401	12,567	9,058
Transaction related costs, net of recoveries	3,067	1,697	4,210	4,171
Depreciation and amortization	199,565	93,379	307,902	179,894
Total expenses	442,016	331,161	800,070	653,536
Company's equity in net income from unconsolidated joint ventures	2,994	8,619	7,024	14,748
Joint venture
Assets
Commercial real estate property, net	6,124,617		6,124,617		5,275,632
Other assets	924,855		924,855		810,567
Total assets	7,049,472		7,049,472		6,086,199
Liabilities and members' equity
Mortgages and other loans payable	4,360,348		4,360,348		3,778,704
Other liabilities	495,523		495,523		485,572
Members' equity	2,193,601		2,193,601		1,821,923
Total liabilities and members' equity	7,049,472		7,049,472		6,086,199
Company's investments in unconsolidated joint ventures	1,262,723		1,262,723		$ 1,172,020
Combined statements of income for the unconsolidated joint ventures
Total revenues	143,535	130,495	272,451	291,633
Operating expenses	26,345	18,362	51,831	45,045
Ground rent	2,572	2,632	5,164	4,657
Real estate taxes	22,335	15,406	41,711	32,342
Interest expense, net of interest income	51,715	44,728	95,722	97,064
Amortization of deferred financing costs	3,145	2,026	6,155	6,659
Transaction related costs, net of recoveries	3	(207)	11	64
Depreciation and amortization	37,894	33,858	70,878	79,462
Total expenses	144,009	116,805	271,472	265,293
Loss on early extinguishment of debt	0	(3,546)	(833)	(6,743)
Net income (loss) before gain on sale	(474)	10,144	146	19,597
Company's equity in net income from unconsolidated joint ventures	2,994	8,619	7,024	14,748
Joint venture
Investment in Unconsolidated Joint Ventures
Management fees, base revenue	$ 2,100	$ 4,800	$ 4,900	$ 11,200

Deferred Costs (Details)

Deferred Costs (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Deferred leasing	$ 406,498	$ 385,555
Deferred financing	191,980	193,776
Deferred costs, gross	598,478	579,331
Less accumulated amortization	(269,640)	(251,369)
Deferred costs, net	$ 328,838	$ 327,962

Mortgages and Other Loans Pay72

Mortgages and Other Loans Payable (Details) - USD ($)	6 Months Ended
	Jun. 30, 2015	Feb. 28, 2015	Jan. 31, 2015	Dec. 31, 2014	Oct. 31, 2014	Nov. 30, 2012
Debt Instrument [Line Items]
Total fixed rate debt	$ 4,601,513,000			$ 4,736,709,000
Total floating rate debt	856,421,000			1,103,942,000
Total fixed rate and floating rate debt	5,457,934,000			5,840,651,000
Mortgages reclassed to liabilities related to assets held for sale	(170,000,000)			(253,942,000)
Total mortgages and other loans payable	5,287,934,000			5,586,709,000
Maximum facility capacity						$ 1,600,000,000
Book value of collateral	7,900,000,000			8,200,000,000
Series J Preferred Stock
Debt Instrument [Line Items]
Total fixed rate debt	4,000,000			4,000,000
Temporary Equity, Carrying Amount, Attributable to Noncontrolling Interest	$ 4,000,000
Preferred units, shares outstanding	4,000
Preferred Units (as a percent)	3.75%
Preferred Units, liquidation preference (in dollars per unit)	$ 1,000
Master Repurchase Agreement
Debt Instrument [Line Items]
Total floating rate debt	$ 106,421,000			100,000,000
Maximum facility capacity	300,000,000
500 West Putnam Avenue
Debt Instrument [Line Items]
Total fixed rate debt	22,676,000			22,968,000
Landmark Square
Debt Instrument [Line Items]
Total fixed rate debt	80,424,000			81,269,000
485 Lexington Avenue
Debt Instrument [Line Items]
Total fixed rate debt	450,000,000			450,000,000
120 West 45th Street
Debt Instrument [Line Items]
Total fixed rate debt	170,000,000			170,000,000
762 Madison Avenue
Debt Instrument [Line Items]
Total fixed rate debt	7,959,000			8,045,000
885 Third Avenue
Debt Instrument [Line Items]
Total fixed rate debt	267,650,000			267,650,000
1745 Broadway
Debt Instrument [Line Items]
Total fixed rate debt	16,000,000			16,000,000
388-390 Greenwich Street
Debt Instrument [Line Items]
Total fixed rate debt	1,004,000,000			1,004,000,000
Total floating rate debt	446,000,000			446,000,000
388-390 Greenwich Street | Swap One
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)					3.80%
Total fixed rate debt					$ 504,000,000
388-390 Greenwich Street | Swap Two
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)					2.69%
Total fixed rate debt					$ 500,000,000
One Madison Avenue
Debt Instrument [Line Items]
Total fixed rate debt	554,405,000			565,742,000
100 Church Street
Debt Instrument [Line Items]
Total fixed rate debt	226,862,000			228,612,000
919 Third Avenue
Debt Instrument [Line Items]
Total fixed rate debt	$ 500,000,000			500,000,000
Interest in property (as a percent)	51.00%
400 East 57th Street
Debt Instrument [Line Items]
Total fixed rate debt	$ 68,276,000			68,896,000
400 East 58th Street
Debt Instrument [Line Items]
Total fixed rate debt	29,261,000			29,527,000
420 Lexington Avenue
Debt Instrument [Line Items]
Total fixed rate debt	300,000,000			300,000,000
1515 Broadway
Debt Instrument [Line Items]
Total fixed rate debt	900,000,000			900,000,000
711 Third Avenue
Debt Instrument [Line Items]
Total fixed rate debt	0			120,000,000
248-252 Bedford Avenue
Debt Instrument [Line Items]
Total floating rate debt	29,000,000			29,000,000
220 East 42nd Street
Debt Instrument [Line Items]
Total floating rate debt	275,000,000			275,000,000
180 Maiden Lane
Debt Instrument [Line Items]
Total floating rate debt	$ 0			$ 253,942,000
Weighted Average | Series J Preferred Stock
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	3.75%
Weighted Average | Master Repurchase Agreement
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)	3.44%
Weighted Average | 500 West Putnam Avenue
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	5.52%
Weighted Average | Landmark Square
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	4.00%
Weighted Average | 485 Lexington Avenue
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	5.61%
Weighted Average | 120 West 45th Street
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	6.12%
Weighted Average | 762 Madison Avenue
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	3.86%	3.86%	3.75%
Weighted Average | 885 Third Avenue
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	6.26%
Weighted Average | 1745 Broadway
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	4.81%
Weighted Average | 388-390 Greenwich Street
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	3.25%
Interest rate, floating rate debt (as a percent)	1.93%
Weighted Average | One Madison Avenue
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	5.91%
Weighted Average | 100 Church Street
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	4.68%
Weighted Average | 919 Third Avenue
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	5.12%
Weighted Average | 400 East 57th Street
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	4.13%
Weighted Average | 400 East 58th Street
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	4.13%
Weighted Average | 420 Lexington Avenue
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	3.99%
Weighted Average | 1515 Broadway
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	3.93%
Weighted Average | 248-252 Bedford Avenue
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)	1.69%
Weighted Average | 220 East 42nd Street
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)	1.79%
Minimum | Master Repurchase Agreement
Debt Instrument [Line Items]
Credit facility, interest rate (as a percent)	2.50%
Maximum | Master Repurchase Agreement
Debt Instrument [Line Items]
Credit facility, interest rate (as a percent)	3.25%

Corporate Indebtedness (Details

Corporate Indebtedness (Details) - USD ($)	1 Months Ended			6 Months Ended
	Jan. 31, 2015	Nov. 30, 2014	Mar. 31, 2014	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Nov. 30, 2012
Corporate Indebtedness
Credit facility, maximum borrowing capacity							$ 1,600,000,000
Outstanding under line of credit facility				$ 705,000,000		$ 385,000,000
Term loan
Corporate Indebtedness
Credit facility, maximum borrowing capacity				$ 833,000,000	$ 783,000,000
Increase in credit facility		$ 50,000,000	$ 383,000,000
Decrease in basis points	0.20%		0.25%
Decrease in facility fee (as a percent)	0.05%
Effective rate (as a percent)				1.66%
Term loan | LIBOR
Corporate Indebtedness
Interest rate added to base rate (as a percent)				1.40%
Term loan | LIBOR | Minimum
Corporate Indebtedness
Interest rate added to base rate (as a percent)				0.95%
Term loan | LIBOR | Maximum
Corporate Indebtedness
Interest rate added to base rate (as a percent)				1.90%
Revolving credit facility
Corporate Indebtedness
Credit facility, maximum borrowing capacity				$ 1,200,000,000
Maximum borrowing capacity, optional expansion				$ 1,500,000,000
Effective rate (as a percent)				1.44%
Outstanding under line of credit facility				$ 705,000,000
Revolving credit facility | Minimum
Corporate Indebtedness
Unused balance fee (as a percent)				0.125%
Facility fee (as a percent)				0.25%
Revolving credit facility | Maximum
Corporate Indebtedness
Unused balance fee (as a percent)				0.30%
Revolving credit facility | LIBOR
Corporate Indebtedness
Interest rate added to base rate (as a percent)				1.25%
Revolving credit facility | LIBOR | Minimum
Corporate Indebtedness
Interest rate added to base rate (as a percent)				0.875%
Revolving credit facility | LIBOR | Maximum
Corporate Indebtedness
Interest rate added to base rate (as a percent)				1.55%
2012 Credit Facility
Corporate Indebtedness
Letters of credit				$ 89,400,000
Ability to borrow under line of credit facility				$ 405,600,000

Corporate Indebtedness (Detai74

Corporate Indebtedness (Details 2)	6 Months Ended
	Jun. 30, 2015USD ($)	Dec. 31, 2014USD ($)	Oct. 06, 2010USD ($)$ / shares	Mar. 20, 2007$ / shares
Debt disclosures by scheduled maturity date
Accreted Balance	$ 2,113,050,000	$ 2,107,078,000
Senior unsecured notes
Debt disclosures by scheduled maturity date
Unpaid Principal Balance	1,310,316,000
Accreted Balance	1,280,050,000	1,274,078,000
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	$ 255,272,000	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 | 3.00% Senior unsecured notes maturing on October 15, 2017
Debt disclosures by scheduled maturity date
Unpaid Principal Balance	$ 345,000,000
Accreted Balance	$ 314,993,000	309,069,000
Coupon Rate (as a percent)	3.00%
Effective rate (as a percent)	3.00%
Term (in Years)	7 years
Premium on sale price to calculate exchange price of notes (as a percent)			30.00%
Exchange price (in dollars per share) | $ / shares			$ 85.81
Adjusted exchange rate for the debentures (in shares)	12.2163
Principal amount of debentures, basis for conversion	$ 1,000
Amount of convertible debt recorded in equity			$ 78,300,000
Debt Instrument, Unamortized Discount	30,000,000
Senior unsecured notes | 5.00% Senior unsecured notes maturing on August 15, 2018
Debt disclosures by scheduled maturity date
Unpaid Principal Balance	250,000,000
Accreted Balance	$ 249,777,000	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 1, 2022
Debt disclosures by scheduled maturity date
Unpaid Principal Balance	$ 200,000,000
Accreted Balance	$ 200,000,000	200,000,000
Coupon Rate (as a percent)	4.50%
Effective rate (as a percent)	4.50%
Term (in Years)	10 years
Senior unsecured notes | 3.00% Senior unsecured notes maturing on March 30, 2027
Debt disclosures by scheduled maturity date
Unpaid Principal Balance	$ 10,008,000
Accreted Balance	$ 10,008,000	10,008,000
Coupon Rate (as a percent)	3.00%
Effective rate (as a percent)	3.00%
Term (in Years)	20 years
Premium on sale price to calculate exchange price of notes (as a percent)				25.00%
Exchange price (in dollars per share) | $ / shares				$ 173.30
Adjusted exchange rate for the debentures (in shares)	5.7952
Principal amount of debentures, basis for conversion	$ 1,000
Senior unsecured notes | Senior unsecured notes redeemed April 2015
Debt disclosures by scheduled maturity date
Unpaid Principal Balance	0
Accreted Balance	$ 0	$ 7,000

Corporate Indebtedness (Detai75

Corporate Indebtedness (Details 3) - USD ($)	1 Months Ended	6 Months Ended
	Jun. 30, 2005	Jun. 30, 2015
Scheduled Amortization and Principal Repayments
Remaining 2,015		$ 121,775,000
2,016		402,979,000
2,017		1,311,400,000
2,018		330,462,000
2,019		931,726,000
Thereafter		5,307,908,000
Total amortization of debt and principal repayments		$ 8,406,250,000
Trust Preferred Securities
Debt Instrument [Line Items]
Proceeds from Issuance of Debt	$ 100,000,000
Coupon Rate (as a percent)		5.61%
Number of Years from Issuance of Debt for which Fixed Rate of Interest will be in Force		10 years
Scheduled Amortization and Principal Repayments
Remaining 2,015		$ 0
2,016		0
2,017		0
2,018		0
2,019		0
Thereafter		100,000,000
Total amortization of debt and principal repayments		100,000,000
Mortgages and other loans payable
Scheduled Amortization
Remaining 2,015		15,354,000
2,016		47,360,000
2,017		61,063,000
2,018		64,462,000
2,019		70,409,000
Thereafter		200,403,000
Total amortization of debt		459,051,000
Principal Repayments and Joint Venture Debt
Remaining 2,015		106,421,000
2,016		100,311,000
2,017		895,329,000
2,018		16,000,000
2,019		28,317,000
Thereafter		3,852,505,000
Total principal repayments		4,998,883,000
2012 Credit Facility
Scheduled Amortization and Principal Repayments
Remaining 2,015		0
2,016		0
2,017		0
2,018		0
2,019		0
Thereafter		705,000,000
Total amortization of debt and principal repayments		705,000,000
Unsecured Term Loan
Scheduled Amortization and Principal Repayments
Remaining 2,015		0
2,016		0
2,017		0
2,018		0
2,019		833,000,000
Thereafter		0
Total amortization of debt and principal repayments		833,000,000
Senior Unsecured Notes
Scheduled Amortization and Principal Repayments
Remaining 2,015		0
2,016		255,308,000
2,017		355,008,000
2,018		250,000,000
2,019		0
Thereafter		450,000,000
Total amortization of debt and principal repayments		1,310,316,000
Joint venture
Principal Repayments and Joint Venture Debt
Remaining 2,015		38,176,000
2,016		534,057,000
2,017		585,526,000
2,018		2,196,000
2,019		104,687,000
Thereafter		446,742,000
Total principal repayments		$ 1,711,384,000
LIBOR | Trust Preferred Securities
Debt Instrument [Line Items]
Interest rate added to base rate (as a percent)		1.25%
LIBOR | Unsecured Term Loan
Debt Instrument [Line Items]
Interest rate added to base rate (as a percent)		1.40%

Corporate Indebtedness (Detai76

Corporate Indebtedness (Details 4) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Interest expense
Interest expense	$ 76,472	$ 78,419	$ 152,930	$ 155,127
Interest income	(726)	(549)	(1,377)	(1,079)
Interest expense, net	75,746	77,870	151,553	154,048
Interest capitalized	$ 7,611	$ 6,218	$ 16,169	$ 10,490

Related Party Transactions (Det

Related Party Transactions (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Amounts due from/to related parties
Due from joint ventures	$ 1,308		$ 1,308		$ 1,254
Other	10,087		10,087		10,481
Related party receivables	11,395		11,395		$ 11,735
Alliance Building Services
Related Party Transactions
Profit participation from related party	1,000	$ 1,000	1,900	$ 1,900
Payments made for services	4,600	5,000	8,600	8,800
Entity with Stephen L Green ownership interest
Related Party Transactions
Property management fees from related party	$ 100	$ 100	$ 200	$ 200

Noncontrolling Interests on t78

Noncontrolling Interests on the Company's Consolidated Financial Statements (Details)	1 Months Ended		3 Months Ended		6 Months Ended		12 Months Ended
	Feb. 28, 2015shares	Jan. 31, 2012$ / sharesshares	Jun. 30, 2015USD ($)unit$ / sharesshares	Jun. 30, 2014USD ($)	Jun. 30, 2015USD ($)unit$ / sharesshares	Jun. 30, 2014USD ($)	Dec. 31, 2014USD ($)unit	Aug. 31, 2014shares
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Balance at beginning of period					$ 469,524,000
Distributions					(112,948,000)
Redemption of common units					(20,650,000)
Net income			$ (1,577,000)	$ 8,645,000	166,000	$ 13,374,000
Accumulated other comprehensive income allocation			42,000	$ 276,000	(158,000)	234,000
Balance at end of period			$ 431,418,000		$ 431,418,000		$ 469,524,000
Series M Preferred Units
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Dividend rate preferred units (as a percent)	3.75%
SL Green Operating Partnership
Organization
Noncontrolling interest in the operating partnership (as a percent)			3.78%		3.78%		3.92%
Number of units of operating partnership owned by the noncontrolling interest unit holders (shares) | unit			3,907,117		3,907,117		3,973,016
Shares of common stock reserved for issuance upon redemption of units of limited partnership interest in operating partnership (shares) | shares			3,907,117		3,907,117
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Balance at beginning of period					$ 469,524,000	$ 265,476,000	$ 265,476,000
Distributions					(4,693,000)		(7,849,000)
Issuance of common units					25,241,000		56,469,000
Redemption of common units					(37,992,000)		(31,653,000)
Net income					166,000		18,467,000
Accumulated other comprehensive income allocation					(158,000)		175,000
Fair value adjustment					(20,670,000)		168,439,000
Balance at end of period			$ 431,418,000		$ 431,418,000		$ 469,524,000
SL Green Operating Partnership | Series G Preferred Units
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Number of preferred units issued (in shares) | shares		1,902,000
Dividend rate preferred units (as a percent)		4.50%
Liquidation preference of preferred units (in dollars per share) | $ / shares		$ 25
Annual dividends on preferred units (in dollars per share) | $ / shares					$ 1.125
Operating partnership common stock value use for conversion of preferred units (in dollars per share) | $ / shares			$ 88.50		$ 88.50
Number of company common stock issue on redemption of operation partnership common units					1
SL Green Operating Partnership | Series F Preferred Units
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Number of preferred units issued (in shares) | shares			60		60
Mandatory liquidation preference (in dollars per share)			$ 1,000		$ 1,000
SL Green Operating Partnership | Series K Preferred Units
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Number of preferred units issued (in shares) | shares								563,954
Dividend rate preferred units (as a percent)					3.50%
Liquidation preference of preferred units (in dollars per share) | $ / shares			$ 25		$ 25
Annual dividends on preferred units (in dollars per share) | $ / shares					0.875
Operating partnership common stock value use for conversion of preferred units (in dollars per share) | $ / shares			$ 134.67		$ 134.67
Preferred Units, shares authorized | shares			700,000		700,000
SL Green Operating Partnership | Series L Preferred Units
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Number of preferred units issued (in shares) | shares								378,634
Dividend rate preferred units (as a percent)					4.00%
Liquidation preference of preferred units (in dollars per share) | $ / shares			$ 25		$ 25
Annual dividends on preferred units (in dollars per share) | $ / shares					$ 1
Preferred Units, shares authorized | shares			500,000		500,000
SL Green Operating Partnership | Series M Preferred Units
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Number of preferred units issued (in shares) | shares	1,600,000
Dividend rate preferred units (as a percent)					3.75%
Liquidation preference of preferred units (in dollars per share) | $ / shares			$ 25		$ 25
Annual dividends on preferred units (in dollars per share) | $ / shares					$ 0.9375
Preferred Units, shares authorized | shares			1,600,000		1,600,000
SL Green Operating Partnership | Series N Preferred Units
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Number of preferred units issued (in shares) | shares			552,303		552,303
Dividend rate preferred units (as a percent)					3.00%
Liquidation preference of preferred units (in dollars per share) | $ / shares			$ 25		$ 25
Annual dividends on preferred units (in dollars per share) | $ / shares					$ 0.75
Preferred Units, shares authorized | shares			552,303		552,303
SL Green Operating Partnership | Series O Preferred Units
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Dividend rate preferred units (as a percent)					6.25%
Preferred Units, shares authorized | shares			1		1

Noncontrolling Interests on t79

Noncontrolling Interests on the Company's Consolidated Financial Statements - Preferred Unit Activity (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Rollforward Analysis of Preferred Unit Activity
Redemption of preferred units	$ (20,650)
SL Green Operating Partnership
Rollforward Analysis of Preferred Unit Activity
Issuance of preferred units	25,241	$ 56,469
Redemption of preferred units	(37,992)	(31,653)
SL Green Operating Partnership | Preferred Units
Rollforward Analysis of Preferred Unit Activity
Balance at beginning of period	71,115	49,550
Issuance of preferred units	53,808	23,565
Redemption of preferred units	(200)	(2,000)
Balance at end of period	$ 124,723	$ 71,115

Stockholders' Equity of the C80

Stockholders' Equity of the Company (Details) - $ / shares	Jun. 30, 2015	Dec. 31, 2014
Stockholders' Equity Note [Abstract]
Authorized capital stock (shares)	260,000,000
Authorized shares, par value (in dollars per share)	$ 0.01
Common stock, shares authorized	160,000,000	160,000,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Excess stock, shares authorized (shares)	75,000,000
Excess stock, par value (in dollars per share)	$ 0.01
Preferred stock, shares authorized (shares)	25,000,000
Preferred stock, par value (in dollars per share)	$ 0.01
Shares issued (shares)	99,589,645
Excess shares issued (shares)	0

Stockholders' Equity of the C81

Stockholders' Equity of the Company (Details 2) - USD ($)	1 Months Ended	3 Months Ended	6 Months Ended
	Aug. 31, 2012	Mar. 31, 2015	Jun. 30, 2015	Jun. 30, 2014	Feb. 28, 2015	Dec. 31, 2014
Stockholders' Equity
Proceeds from sale of common stock			$ 124,999,000	$ 8,750,000
Common stock, shares authorized			160,000,000			160,000,000
At-the-Market Equity Offering Programs
Stockholders' Equity
Aggregate value of the shares of common stock to be sold				$ 300,000,000
Issuance of common stock (in shares)		895,956
Proceeds from sale of common stock		$ 113,400,000
New At-the-Market Equity offering programs
Stockholders' Equity
Aggregate value of the shares of common stock to be sold		$ 300,000,000
Issuance of common stock (in shares)			91,180
Proceeds from sale of common stock			$ 12,000,000
Aggregate value of shares available for issuance			$ 288,000,000
Series I Preferred Stock
Stockholders' Equity
Preferred stock, shares outstanding			9,200,000			9,200,000
Dividend rate preferred units (as a percent)			6.50%
Perpetual Preferred stock, liquidation preference (in dollars per share)			$ 25			$ 25
Perpetual Preferred stock, annual dividends per share (in dollars per share)			$ 1.625
Contributions of net proceeds from sale of preferred stock	$ 221,900,000
Dividend Reinvestment and Stock Purchase Plan (DRIP)
Stockholders' Equity
Issuance of common stock (in shares)			775,316
Proceeds from sale of common stock			$ 99,500,000
Common stock, shares authorized					3,500,000

Stockholders' Equity of the C82

Stockholders' Equity of the Company (Details 3) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Basic Earnings:
(Loss) income attributable to SL Green common stockholders	$ (39,106)	$ 235,541	$ 4,171	$ 381,631
Diluted Earnings:
(Loss) income attributable to SL Green common stockholders	$ (39,106)	$ 244,186	$ 4,337	$ 395,005
Basic Shares:
Basic weighted average common shares outstanding (shares)	99,579,000	95,455,000	98,994,000	95,288,000
Effect of Dilutive Securities:
Redemption of units to common shares (shares)	0	3,515,000	3,936,000	3,339,000
Stock-based compensation plans (shares)	0	514,000	493,000	501,000
Diluted weighted average common stock outstanding (shares)	99,579,000	99,484,000	103,423,000	99,128,000
Common stock shares excluded from the diluted shares outstanding (shares)	228,122	748,000	212,317	797,000
Common stock shares excluded from the diluted shares outstanding due to net loss (shares)	4,367,272
Common Stock
Effect of Dilutive Securities:
Redemption of units to common shares	$ 0	$ 8,645	$ 166	$ 13,374

Partners' Capital of the Oper83

Partners' Capital of the Operating Partnership (Details)	Jun. 30, 2015unitshares	Dec. 31, 2014unitshares
Common Stock
Stockholders' Equity
Units outstanding (units)	99,590,000	97,325,000
SL Green Operating Partnership
Stockholders' Equity
Noncontrolling interest in the operating partnership (as a percent)	3.78%	3.92%
Number of units of operating partnership owned by the noncontrolling interest unit holders (units) | unit	3,907,117	3,973,016
SL Green Operating Partnership | Series I Preferred Units
Stockholders' Equity
Units outstanding (units)	9,200,000
SL Green Operating Partnership | Common Stock
Stockholders' Equity
Units outstanding (units)	99,589,645

Partners' Capital of the Oper84

Partners' Capital of the Operating Partnership - EPS (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Stockholders' Equity
(Loss) income attributable to SL Green common stockholders	$ (39,106)	$ 235,541	$ 4,171	$ 381,631
Basic weighted average common shares outstanding (shares)	99,579,000	95,455,000	98,994,000	95,288,000
Common stock shares excluded from the diluted shares outstanding (shares)	228,122	748,000	212,317	797,000
Common stock shares excluded from the diluted shares outstanding due to net loss (shares)	4,367,272
SL Green Operating Partnership
Stockholders' Equity
(Loss) income attributable to SL Green common stockholders	$ (40,683)	$ 244,186	$ 4,337	$ 395,005
Basic weighted average common shares outstanding (shares)	103,487,000	98,970,000	102,930,000	98,627,000
Stock-based compensation plans (shares)	0	514,000	493,000	501,000
Diluted weighted average common units outstanding (shares)	103,487,000	99,484,000	103,423,000	99,128,000
Common stock shares excluded from the diluted shares outstanding (shares)	228,122	748,000	212,317	797,000
Common stock shares excluded from the diluted shares outstanding due to net loss (shares)	459,216

Share-based Compensation - Addi

Share-based Compensation - Additional Information (Details)

1 Months Ended

3 Months Ended

6 Months Ended

12 Months Ended

Jan. 31, 2015USD ($)

Aug. 31, 2014shares

Aug. 31, 2011USD ($)

Jun. 30, 2015USD ($)unit / sharesfungible_unitshares

Jun. 30, 2014USD ($)shares

Jun. 30, 2015USD ($)unit / sharesfungible_unit$ / sharesshares

Jun. 30, 2014USD ($)shares

Dec. 31, 2014USD ($)shares

Sep. 30, 2014shares

Dec. 31, 2013shares

Dec. 11, 2013

Dec. 31, 2012shares

Dec. 17, 2012

Dec. 31, 2011shares

Dec. 31, 2010shares

Dec. 31, 2009USD ($)

Jan. 01, 2008shares

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Cost of the plan, subject to adjustment for forfeitures

$ 1,800,000

$ 1,900,000

$ 3,400,000

$ 3,500,000

Stock options

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Period of commencement of option vesting, from date of grant (in years)

1 year

Exercise price of options granted, low end of the range (in dollars per share) | $ / shares

$ 20.67

Exercise price of options granted, high end of the range (in dollars per share) | $ / shares

$ 137.18

Remaining weighted average contractual life of the options outstanding (in years)

3 years 9 months 1 day

Remaining weighted average contractual life of the options exercisable (in years)

3 years 6 months 21 days

Total unrecognized compensation cost related to unvested stock awards

10,100,000

$ 10,100,000

Weighted average period for recognition of compensation cost related to unvested stock awards (in years)

3 years

Weighted average fair value of options granted during the year

$ 356,288

$ 2,841,678

Stock options | Minimum

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Award expiration period (in years)

5 years

Options vesting period (in years)

1 year

Stock options | Maximum

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Award expiration period (in years)

10 years

Options vesting period (in years)

5 years

Restricted Stock Awards

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Compensation expense

$ 3,812,029

9,658,019

Total unrecognized compensation cost related to unvested stock awards

$ 8,700,000

$ 8,700,000

Weighted average period for recognition of compensation cost related to unvested stock awards (in years)

1 year 8 months 24 days

Annual award vesting rate, low end of range (as a percent)

15.00%

Annual award vesting rate, high end of range (as a percent)

35.00%

Fair value of restricted stock vested during the period

$ 7,200,000

5,500,000

Weighted average fair value of options granted during the year

$ 391,271

$ 1,141,675

Awards granted (in shares) | shares

3,053

9,550

Awards outstanding (in shares) | shares

3,001,132

3,001,132

3,000,979

2,994,197

LTIP units

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Weighted average fair value of options granted during the year

$ 25,400,000

$ 33,200,000

Performance Shares

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Total unrecognized compensation cost related to unvested stock awards

$ 7,300,000

$ 7,300,000

Weighted average period for recognition of compensation cost related to unvested stock awards (in years)

1 year

Share-based Compensation

$ 3,100,000

2,100,000

$ 16,300,000

10,300,000

Third Amendment and Restated 2005 Stock Option and Incentive Plan

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Maximum fungible units that may be granted (in shares) | fungible_unit

17,130,000

17,130,000

Fungible units per share (in fungible units per share) | unit / shares

2.76

2.76

Shares that may be issued if equal to fungible units (shares) (less than) | shares

17,130,000

17,130,000

Fungible units (in shares) | shares

1,700,000

1,700,000

Third Amendment and Restated 2005 Stock Option and Incentive Plan | Stock options

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Compensation expense

$ 1,900,000

2,000,000

$ 3,900,000

4,100,000

Stock options, stock appreciation rights and other awards

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Fungible units per share (in fungible units per share) | unit / shares

0.77

0.77

Award expiration period (in years)

5 years

All other awards

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Fungible units per share (in fungible units per share) | unit / shares

1

1

Award expiration period (in years)

10 years

2010 Notional Unit Long-Term Compensation Plan

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Compensation expense

1,600,000

1,900,000

Cost of the plan, subject to adjustment for forfeitures

$ 31,700,000

Approximate amount of awards that may be earned by recipients after beginning of the second year if maximum performance achieved

$ 25,000,000

Approximate amount of awards that may be earned by recipients after beginning of the third year if maximum performance achieved

$ 25,000,000

Minimum stock price appreciation to earn maximum amount of awards (as a percent)

50.00%

LTIP units earned (in shares) | shares

327,416

385,583

366,815

Percentage of LTIP Units earned, vested (percent)

25.00%

50.00%

2010 Notional Unit Long-Term Compensation Plan | Minimum

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Approximate amount of LTIP units that may be earned by the recipients based on stock price appreciation

$ 15,000,000

2010 Notional Unit Long-Term Compensation Plan | Maximum

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Approximate amount of LTIP units that may be earned by the recipients based on stock price appreciation

$ 75,000,000

2011 Outperformance Plan

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Compensation expense

$ 3,200,000

$ 4,300,000

$ 3,900,000

$ 6,100,000

Cost of the plan, subject to adjustment for forfeitures

26,800,000

Approximate amount of LTIP units that may be earned by the recipients based on stock price appreciation

$ 85,000,000

LTIP units earned (in shares) | shares

560,908

560,908

280,454

Value of LTIP Units that could be earned expressed as percentage of outperformance amount in excess of the 30% benchmark (percent)

10.00%

Duration period return to stockholders exceeds 25% (in years)

3 years

Cumulative return to stockholders (percent)

25.00%

Return to stockholders

$ 85,000,000

Performance period (in years)

3 years

2014 Outperformance Plan

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Compensation expense

1,500,000

2,900,000

Cost of the plan, subject to adjustment for forfeitures

27,900,000

LTIP units earned (in shares) | shares

610,000

Performance period (in years)

3 years

Award period (in years)

3 years

Percentage of LTIP units that may be earned based on the Company's absolute total return to stockholders

66.67%

Percentage of LTIP units that may be earned based on relative total return to stockholders compared to constituents of the MSCI REIT index

33.33%

Deferred Stock Compensation Plan for Directors

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Compensation expense

$ 300,000

$ 100,000

$ 1,700,000

$ 1,400,000

Maximum percentage of the annual retainer fee, chairman fees and meeting fees that may be deferred by non-employee directors (percent)

100.00%

100.00%

Awards granted (in shares) | shares

7,941

Shares issued (in shares) | shares

5,396

Awards outstanding (in shares) | shares

83,644

83,644

Employee Stock Purchase Plan

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Shares of common stock available for issuance (shares) | shares

500,000

Duration of each offering period starting the first day of each calendar quarter (in months)

3 months

Purchase price as a percentage of market value of the common stock (percent)

85.00%

85.00%

Shares of common stock issued (shares) | shares

83,477

83,477

Earned anytime after beginning of second year | 2011 Outperformance Plan

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Percentage of units vested

33.33%

Vested on August 31, 2014 | 2011 Outperformance Plan

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Percentage of units vested

50.00%

Vesting on August 31, 2015 | 2011 Outperformance Plan

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Percentage of units vested

50.00%

Earned any time after beginning of third year | 2011 Outperformance Plan

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Percentage of units vested

66.67%

Vesting on August 31, 2017 | 2014 Outperformance Plan

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Percentage of units vested

50.00%

Vesting on August 31, 2018 | 2014 Outperformance Plan

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Percentage of units vested

50.00%

Share-based Compensation (Detai

Share-based Compensation (Details) - USD ($)	6 Months Ended	12 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Stock options
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Dividend yield (as a percent)	1.60%	1.60%
Expected life of option (in years)	3 years 6 months	3 years 7 months 6 days
Risk-free interest rate (as a percent)	1.02%	1.29%
Expected stock price volatility (as a percent)	34.00%	33.97%
Options Outstanding
Balance at beginning of year (in shares)	1,462,726	1,765,034
Granted (in shares)	12,000	102,050
Exercised (in shares)	(154,836)	(348,156)
Lapsed or cancelled (in shares)	(18,767)	(56,202)
Balance at end of period (in shares)	1,301,123	1,462,726
Options exercisable at end of year (in shares)	606,157	428,951
Weighted average fair value of options granted during the year	$ 356,288	$ 2,841,678
Weighted Average Exercise Price
Balance at beginning of year (in dollars per share)	$ 87.98	$ 83.24
Granted (in dollars per share)	128.82	119.12
Exercised (in dollars per share)	75.43	72.76
Lapsed or cancelled (in dollars per share)	100.67	90.03
Balance at end of period (in dollars per share)	89.66	87.98
Options exercisable at end of period (in dollars per share)	$ 88.15	$ 90.32
Restricted Stock Awards
Options Outstanding
Weighted average fair value of options granted during the year	$ 391,271	$ 1,141,675
Summary of restricted stock
Balance at beginning of year (in shares)	3,000,979	2,994,197
Granted (in shares)	3,053	9,550
Cancelled (in shares)	(2,900)	(2,768)
Balance at end of period (in shares)	3,001,132	3,000,979
Vested during the period (in shares)	84,581	75,043
Compensation expense recorded	$ 3,812,029	$ 9,658,019

Accumulated Other Comprehensi87

Accumulated Other Comprehensive Loss of the Company (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) of the Company [Roll Forward]
Beginning Balance	$ (6,980)
Ending Balance	(10,906)
Deferred net losses from terminated hedges	10,800	$ 11,800
SL Green Realty Corp
Accumulated Other Comprehensive Income (Loss) of the Company [Roll Forward]
Beginning Balance	(6,980)
Other comprehensive loss before reclassifications	(9,838)
Amounts reclassified from accumulated other comprehensive income	5,912
Ending Balance	(10,906)
SL Green Realty Corp | Net unrealized (loss) gain on derivative instruments
Accumulated Other Comprehensive Income (Loss) of the Company [Roll Forward]
Beginning Balance	(9,498)
Other comprehensive loss before reclassifications	(8,258)
Amounts reclassified from accumulated other comprehensive income	5,275
Ending Balance	(12,481)
SL Green Realty Corp | Unrealized gain and (loss) on marketable securities
Accumulated Other Comprehensive Income (Loss) of the Company [Roll Forward]
Beginning Balance	2,613
Other comprehensive loss before reclassifications	(654)
Amounts reclassified from accumulated other comprehensive income	0
Ending Balance	1,959
SL Green Realty Corp | Joint venture | Net unrealized (loss) gain on derivative instruments
Accumulated Other Comprehensive Income (Loss) of the Company [Roll Forward]
Beginning Balance	(95)
Other comprehensive loss before reclassifications	(926)
Amounts reclassified from accumulated other comprehensive income	637
Ending Balance	$ (384)

Accumulated Other Comprehensi88

Accumulated Other Comprehensive Loss of the Operating Partnership (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) of the Operating Partnership [Roll Forward]
Beginning Balance	$ (6,980)
Ending Balance	(10,906)
Deferred net losses from terminated hedges	10,800	$ 11,800
SL Green Operating Partnership
Accumulated Other Comprehensive Income (Loss) of the Operating Partnership [Roll Forward]
Beginning Balance	(7,256)
Other comprehensive loss before reclassifications	(10,230)
Amounts reclassified from accumulated other comprehensive income	6,146
Ending Balance	(11,340)
Deferred net losses from terminated hedges	11,200	$ 12,200
Net unrealized (loss) gain on derivative instruments | SL Green Operating Partnership
Accumulated Other Comprehensive Income (Loss) of the Operating Partnership [Roll Forward]
Beginning Balance	(9,845)
Other comprehensive loss before reclassifications	(8,616)
Amounts reclassified from accumulated other comprehensive income	5,484
Ending Balance	(12,977)
Unrealized gain and (loss) on marketable securities | SL Green Operating Partnership
Accumulated Other Comprehensive Income (Loss) of the Operating Partnership [Roll Forward]
Beginning Balance	2,689
Other comprehensive loss before reclassifications	(654)
Amounts reclassified from accumulated other comprehensive income	0
Ending Balance	2,035
Joint venture | Net unrealized (loss) gain on derivative instruments | SL Green Operating Partnership
Accumulated Other Comprehensive Income (Loss) of the Operating Partnership [Roll Forward]
Beginning Balance	(100)
Other comprehensive loss before reclassifications	(960)
Amounts reclassified from accumulated other comprehensive income	662
Ending Balance	$ (398)

Fair Value Measurements (Detail

Fair Value Measurements (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Fair Value of Financial Instruments
Marketable securities	$ 46,251	$ 39,429
Interest rate swap agreements (included in other assets)	23	2,174
Interest rate swap agreements (included in accrued interest payable and other liabilities)	14,576	14,728
Debt and preferred equity investments	1,685,234	1,408,804
Carrying Value
Fair Value of Financial Instruments
Fixed rate debt	6,011,563	6,140,786
Variable rate debt	2,364,421	2,291,943
Total	8,375,984	8,432,729
Fair Value
Fair Value of Financial Instruments
Marketable securities	46,251	39,429
Total	8,831,774	8,881,188
Estimated fair value of debt and preferred equity investments, low end of range	1,900,000	1,500,000
Estimated fair value of debt and preferred equity investments, high end of range	2,100,000	1,800,000
Level 1
Fair Value of Financial Instruments
Interest rate swap agreements (included in other assets)	0	0
Interest rate swap agreements (included in accrued interest payable and other liabilities)	0	0
Level 2
Fair Value of Financial Instruments
Interest rate swap agreements (included in other assets)	23	2,174
Interest rate swap agreements (included in accrued interest payable and other liabilities)	14,576	14,728
Level 3
Fair Value of Financial Instruments
Marketable securities	0	0
Interest rate swap agreements (included in other assets)	0	0
Interest rate swap agreements (included in accrued interest payable and other liabilities)	0	0
Level 3 | Carrying Value
Fair Value of Financial Instruments
Debt and preferred equity investments	1,685,234	1,408,804
Level 3 | Fair Value
Fair Value of Financial Instruments
Fixed rate debt	6,419,286	6,565,236
Variable rate debt	2,412,488	2,315,952
Equity Securities | Level 1
Fair Value of Financial Instruments
Marketable securities	4,070	4,332
Mortgage-backed securities | Level 2
Fair Value of Financial Instruments
Marketable securities	$ 42,181	$ 35,097

Financial Instruments_ Deriva90

Financial Instruments: Derivatives and Hedging (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Financial Instruments: Derivatives and Hedging
Fair Value	$ 23		$ 23		$ 2,174
Fair Value	(14,576)		(14,576)		$ (14,728)
Derivative, Fair Value, Net	(14,553)		(14,553)
Gain (loss) from settlement of hedges included in accumulated other comprehensive loss (less than)	1	$ (31)	1	$ (41)
Fair value of derivatives in a net liability position	15,500		15,500
Aggregate termination value	15,500		15,500
Estimated current balance held in accumulated other comprehensive loss to be reclassified into earnings within the next 12 months			8,700
Share of joint venture of accumulated other comprehensive loss reclassified into equity in net income from unconsolidated joint ventures within the next 12 months			1,100
Amount of (Loss) Gain Recognized in Other Comprehensive Loss (Effective Portion)	(818)	5,465	(9,576)	3,668
Amount of Loss Reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion)	3,068	1,828	6,146	3,793
Amount of (Loss) or Gain Recognized into Income (Ineffective Portion)	2	1	(424)	2
Joint venture
Financial Instruments: Derivatives and Hedging
Amount of (Loss) Gain Recognized in Other Comprehensive Loss (Effective Portion)	277	5,930	(960)	4,184
Amount of Loss Reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion)	331	556	662	1,829
Amount of (Loss) or Gain Recognized into Income (Ineffective Portion)	16	0	0	0
Interest Rate Cap- Sold Expiring in May 2016
Financial Instruments: Derivatives and Hedging
Notional Value	$ 504,000		$ 504,000
Strike Rate (as a percent)	4.75%		4.75%
Fair Value	$ 0		$ 0
Interest Rate Cap Expiring in May 2016
Financial Instruments: Derivatives and Hedging
Notional Value	$ 504,000		$ 504,000
Strike Rate (as a percent)	4.75%		4.75%
Fair Value	$ 0		$ 0
Interest Rate Cap Expiring In May 2016
Financial Instruments: Derivatives and Hedging
Notional Value	$ 500,000		$ 500,000
Strike Rate (as a percent)	4.75%		4.75%
Fair Value	$ 0		$ 0
Interest Rate Cap- Sold Expiring in May 2016
Financial Instruments: Derivatives and Hedging
Notional Value	$ 500,000		$ 500,000
Strike Rate (as a percent)	4.75%		4.75%
Fair Value	$ 0		$ 0
Interest Rate Cap Expiring In May 2016
Financial Instruments: Derivatives and Hedging
Notional Value	$ 446,000		$ 446,000
Strike Rate (as a percent)	4.75%		4.75%
Fair Value	$ 0		$ 0
Interest Rate Cap Expiring in November, 2015
Financial Instruments: Derivatives and Hedging
Notional Value	$ 263,426		$ 263,426
Strike Rate (as a percent)	6.00%		6.00%
Fair Value	$ 0		$ 0
Interest Rate Cap Expiring in September 2015
Financial Instruments: Derivatives and Hedging
Notional Value	$ 137,500		$ 137,500
Strike Rate (as a percent)	4.00%		4.00%
Fair Value	$ 0		$ 0
Interest Rate Swap Expiring in December 2017
Financial Instruments: Derivatives and Hedging
Notional Value	$ 200,000		$ 200,000
Strike Rate (as a percent)	0.9375%		0.9375%
Fair Value	$ (133)		$ (133)
Interest Rate Swap Expiring in December 2017
Financial Instruments: Derivatives and Hedging
Notional Value	$ 150,000		$ 150,000
Strike Rate (as a percent)	0.94%		0.94%
Fair Value	$ (103)		$ (103)
Interest Rate Swap Expiring in December 2017
Financial Instruments: Derivatives and Hedging
Notional Value	$ 150,000		$ 150,000
Strike Rate (as a percent)	0.94%		0.94%
Fair Value	$ (103)		$ (103)
Interest Rate Swap Expiring in December 2017
Financial Instruments: Derivatives and Hedging
Notional Value	$ 144,000		$ 144,000
Strike Rate (as a percent)	2.236%		2.236%
Fair Value	$ (4,541)		$ (4,541)
Interest Rate Swap Expiring in December 2017
Financial Instruments: Derivatives and Hedging
Notional Value	$ 86,400		$ 86,400
Strike Rate (as a percent)	1.9475%		1.9475%
Fair Value	$ (2,123)		$ (2,123)
Interest Rate Swap Expiring in December 2017
Financial Instruments: Derivatives and Hedging
Notional Value	$ 72,000		$ 72,000
Strike Rate (as a percent)	2.31%		2.31%
Fair Value	$ (2,399)		$ (2,399)
Interest Rate Swap Expiring in December 2017
Financial Instruments: Derivatives and Hedging
Notional Value	$ 72,000		$ 72,000
Strike Rate (as a percent)	1.345%		1.345%
Fair Value	$ (725)		$ (725)
Interest Rate Swap Expiring in December 2017
Financial Instruments: Derivatives and Hedging
Notional Value	$ 72,000		$ 72,000
Strike Rate (as a percent)	2.31%		2.31%
Fair Value	$ (2,398)		$ (2,398)
Interest Rate Swap Expiring in December 2017
Financial Instruments: Derivatives and Hedging
Notional Value	$ 57,600		$ 57,600
Strike Rate (as a percent)	1.99%		1.99%
Fair Value	$ (1,474)		$ (1,474)
Interest Rate Swap Expiring in June 2016
Financial Instruments: Derivatives and Hedging
Notional Value	$ 30,000		$ 30,000
Strike Rate (as a percent)	2.295%		2.295%
Fair Value	$ (548)		$ (548)
Interest Rate Swap Expiring in January 2017
Financial Instruments: Derivatives and Hedging
Notional Value	$ 14,409		$ 14,409
Strike Rate (as a percent)	0.50%		0.50%
Fair Value	$ 23		$ 23
Interest Rate Swap Expiring in February, 2017
Financial Instruments: Derivatives and Hedging
Notional Value	$ 8,018		$ 8,018
Strike Rate (as a percent)	0.852%		0.852%
Fair Value	$ (29)		$ (29)
Interest Rate Swap
Financial Instruments: Derivatives and Hedging
Amount of (Loss) Gain Recognized in Other Comprehensive Loss (Effective Portion)	(1,095)	(465)	(8,616)	(516)
Amount of Loss Reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion)	2,737	1,272	5,484	1,964
Amount of (Loss) or Gain Recognized into Income (Ineffective Portion)	$ (14)	$ 1	$ (424)	$ 2

Commitments and Contingencies91

Commitments and Contingencies (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	May. 31, 2015
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Initial term of non cancellable operating leases, minimum (in years)	1 year
Capital lease
Remaining 2,015	$ 73
2,016	170
2,017	291
2,018	291
2,019	315
Thereafter	56,568
Total minimum lease payments	57,708
Less amount representing interest	(36,695)
Capital lease obligations	21,013
Non-cancellable operating leases
Remaining 2,015	15,247
2,016	30,612
2,017	30,845
2,018	30,845
2,019	30,862
Thereafter	720,698
Total minimum lease payments	$ 859,109
Eleven Madison Avenue
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Real estate purchase price		$ 2,285,000
Lease stipulated improvement costs		$ 300,000

Segment Information (Details)

Segment Information (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015USD ($)	Jun. 30, 2014USD ($)	Jun. 30, 2015USD ($)segment	Jun. 30, 2014USD ($)	Dec. 31, 2014USD ($)
Segment information
Number of reportable segments (segment) | segment			2
Total revenues	$ 409,074	$ 380,632	$ 805,373	$ 743,077
(Loss) income from continuing operations before equity in net gain on sale of interest in unconsolidated joint venture/real estate and purchase price fair value adjustment	(29,948)	57,062	12,278	103,264
Total assets	17,266,958		$ 17,266,958		$ 17,096,587
Leverage rate assumption (as a percent)			100.00%
Marketing, general and administrative expenses and transaction related costs	23,200	23,900	$ 48,700	47,100
Operating Segments | Real Estate Segment
Segment information
Total revenues	363,883	340,918	718,113	649,279
(Loss) income from continuing operations before equity in net gain on sale of interest in unconsolidated joint venture/real estate and purchase price fair value adjustment	(65,677)	23,069	(58,918)	23,688
Total assets	15,562,297		15,562,297		15,671,662
Operating Segments | Debt and Preferred Equity Segment
Segment information
Total revenues	45,191	39,714	87,260	93,798
(Loss) income from continuing operations before equity in net gain on sale of interest in unconsolidated joint venture/real estate and purchase price fair value adjustment	35,729	$ 33,993	71,196	$ 79,576
Total assets	$ 1,704,661		$ 1,704,661		$ 1,424,925

Segment Information (Details 2)

Segment Information (Details 2) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Reconciliation of income from continuing operations to net income attributable to SL Green common stockholders
(Loss) income from continuing operations before equity in net gain on sale of interest in unconsolidated joint venture/real estate	$ (29,948)	$ 57,062	$ 12,278	$ 103,264
Equity in net gain on sale of interest in unconsolidated joint venture/real estate	769	1,444	769	106,084
Purchase price fair value adjustment	0	71,446	0	71,446
(Loss) income from continuing operations	(29,179)	129,952	13,047	280,794
Net income from discontinued operations	0	5,645	427	11,414
Gain on sale of discontinued operations	0	114,735	12,983	114,735
Net (loss) income	$ (29,179)	$ 250,332	$ 26,457	$ 406,943

Subsequent Events (Details)

Subsequent Events (Details) - USD ($)	1 Months Ended
	Jul. 31, 2015	Nov. 30, 2014	Mar. 31, 2014	Jun. 30, 2015	Mar. 31, 2015	Nov. 30, 2012
Subsequent Event [Line Items]
Credit facility, maximum borrowing capacity						$ 1,600,000,000
Subsequent Event
Subsequent Event [Line Items]
Increase in credit facility	$ 500,000,000
Credit facility, maximum borrowing capacity	$ 2,533,000,000
SL Green Operating Partnership | Series P Preferred Units | Subsequent Event
Subsequent Event [Line Items]
Preferred Units, shares authorized	200,000
Dividend rate preferred units (as a percent)	4.00%
Preferred units, liquidation preference (in dollars per share)	$ 25
Number of preferred units issued (in shares)	200,000
SL Green Operating Partnership | Series Q Preferred Units | Subsequent Event
Subsequent Event [Line Items]
Preferred Units, shares authorized	268,000
Dividend rate preferred units (as a percent)	3.50%
Preferred units, liquidation preference (in dollars per share)	$ 25
Number of preferred units issued (in shares)	268,000
Revolving credit facility
Subsequent Event [Line Items]
Credit facility, maximum borrowing capacity				$ 1,200,000,000
Revolving credit facility | Subsequent Event
Subsequent Event [Line Items]
Increase in credit facility	$ 400,000,000
Credit facility, maximum borrowing capacity	1,600,000,000
Term loan
Subsequent Event [Line Items]
Increase in credit facility		$ 50,000,000	$ 383,000,000
Credit facility, maximum borrowing capacity				$ 833,000,000	$ 783,000,000
Term loan | Subsequent Event
Subsequent Event [Line Items]
Increase in credit facility	100,000,000
Credit facility, maximum borrowing capacity	$ 933,000,000