SL Green Realty (SLG) 10-Q 9 May 16 2016 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2016	May. 06, 2016
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	Mar. 31, 2016
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus (Q1,Q2,Q3,FY)	Q1
Amendment Flag	false
Entity Common Stock, Shares Outstanding		100,236,718
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	Mar. 31, 2016
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus (Q1,Q2,Q3,FY)	Q1
Amendment Flag	false
Entity Common Stock, Shares Outstanding		1,497,718

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Commercial real estate properties, at cost:
Land and land interests	$ 4,115,982	$ 4,779,159
Building and improvements	9,334,385	10,423,739
Building leasehold and improvements	1,431,238	1,431,259
Properties under capital lease	47,445	47,445
Total commercial real estate properties, at cost	14,929,050	16,681,602
Less: accumulated depreciation	(2,100,109)	(2,060,706)
Total commercial real estate properties, net	12,828,941	14,620,896
Assets held for sale	1,891,575	34,981
Cash and cash equivalents	316,205	255,399
Restricted cash	179,938	233,578
Investments in marketable securities	43,915	45,138
Tenant and other receivables, net of allowance of $17,829 and $17,618 in 2016 and 2015, respectively	55,441	63,491
Related party receivables	15,148	10,650
Deferred rents receivable, net of allowance of $23,088 and $21,730 in 2016 and 2015, respectively	428,334	498,776
Debt and preferred equity investments, net of discounts and deferred origination fees of $14,935 and $18,759 in 2016 and 2015, respectively	1,378,616	1,670,020
Investments in unconsolidated joint ventures	1,146,085	1,203,858
Deferred costs, net	246,503	239,920
Other assets	1,055,267	850,939
Total assets	19,585,968	19,727,646
Liabilities
Mortgages and other loans payable, net	5,585,171	6,881,920
Revolving credit facility, net	766,733	985,055
Term loan and senior unsecured notes, net	2,056,623	2,308,478
Accrued interest payable	36,941	42,406
Other liabilities	247,950	168,477
Accounts payable and accrued expenses	168,322	196,213
Deferred revenue	414,686	399,102
Capital lease obligations	41,554	41,360
Deferred land leases payable	2,010	1,783
Dividend and distributions payable	80,038	79,790
Security deposits	67,001	68,023
Liabilities related to assets held for sale	1,612,001	29,000
Junior subordinated deferrable interest debentures held by trusts that issued trust preferred securities	100,000	100,000
Total liabilities	$ 11,179,030	$ 11,301,607
Commitments and contingencies
Noncontrolling interests in Operating Partnership	$ 407,046	$ 424,206
Preferred units	304,869	282,516
Equity
Common stock, $0.01 par value, 160,000 shares authorized and 100,168 and 100,063 issued and outstanding at March 31, 2016 and December 31, 2015, respectively (including 87 shares held in treasury at March 31, 2016 and December 31, 2015)	1,002	1,001
Additional paid-in-capital	5,451,787	5,439,735
Treasury stock at cost	(10,000)	(10,000)
Accumulated other comprehensive loss	(17,222)	(8,749)
Retained earnings	1,620,669	1,643,546
Total SL Green stockholders' equity	7,268,168	7,287,465
Noncontrolling interests in other partnerships	426,855	431,852
Total equity	7,695,023	7,719,317
SL Green stockholders equity:
Total liabilities and equity/capital	19,585,968	19,727,646
Series I Preferred Stock
Equity
Series I Preferred Stock, $0.01 par value, $25.00 liquidation preference, 9,200 issued and outstanding at both March 31, 2016 and December 31, 2015	221,932	221,932
SL Green Operating Partnership
Commercial real estate properties, at cost:
Land and land interests	4,115,982	4,779,159
Building and improvements	9,334,385	10,423,739
Building leasehold and improvements	1,431,238	1,431,259
Properties under capital lease	47,445	47,445
Total commercial real estate properties, at cost	14,929,050	16,681,602
Less: accumulated depreciation	(2,100,109)	(2,060,706)
Total commercial real estate properties, net	12,828,941	14,620,896
Assets held for sale	1,891,575	34,981
Cash and cash equivalents	316,205	255,399
Restricted cash	179,938	233,578
Investments in marketable securities	43,915	45,138
Tenant and other receivables, net of allowance of $17,829 and $17,618 in 2016 and 2015, respectively	55,441	63,491
Related party receivables	15,148	10,650
Deferred rents receivable, net of allowance of $23,088 and $21,730 in 2016 and 2015, respectively	428,334	498,776
Debt and preferred equity investments, net of discounts and deferred origination fees of $14,935 and $18,759 in 2016 and 2015, respectively	1,378,616	1,670,020
Investments in unconsolidated joint ventures	1,146,085	1,203,858
Deferred costs, net	246,503	239,920
Other assets	1,055,267	850,939
Total assets	19,585,968	19,727,646
Liabilities
Mortgages and other loans payable, net	5,585,171	6,881,920
Revolving credit facility, net	766,733	985,055
Term loan and senior unsecured notes, net	2,056,623	2,308,478
Accrued interest payable	36,941	42,406
Other liabilities	247,950	168,477
Accounts payable and accrued expenses	168,322	196,213
Deferred revenue	414,686	399,102
Capital lease obligations	41,554	41,360
Deferred land leases payable	2,010	1,783
Dividend and distributions payable	80,038	79,790
Security deposits	67,001	68,023
Liabilities related to assets held for sale	1,612,001	29,000
Junior subordinated deferrable interest debentures held by trusts that issued trust preferred securities	100,000	100,000
Total liabilities	$ 11,179,030	$ 11,301,607
Commitments and contingencies
Noncontrolling interests in Operating Partnership	$ 407,046	$ 424,206
Limited partner interests in SLGOP (4,001 and 3,746 limited partner common units outstanding at March 31, 2016 and December 31, 2015, respectively)	407,046	424,206
Preferred units	304,869	282,516
Equity
Accumulated other comprehensive loss	(17,222)	(8,749)
SL Green stockholders equity:
SL Green partners' capital (1,041 and 1,035 general partner common units and 99,041 and 98,941 limited partner common units outstanding at March 31, 2016 and December 31, 2015, respectively)	7,063,458	7,074,282
Total SLGOP partners' capital	7,268,168	7,287,465
Noncontrolling interests in other partnerships	426,855	431,852
Total capital	7,695,023	7,719,317
Total liabilities and equity/capital	19,585,968	19,727,646
SL Green Operating Partnership | Series I Preferred Stock
SL Green stockholders equity:
Series I Preferred Units, $25.00 liquidation preference, 9,200 issued and outstanding at both March 31, 2016 and December 31, 2015	$ 221,932	$ 221,932

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Tenant and other receivables, allowance	$ 176,829	$ 17,618
Deferred rents receivable, allowance	23,088	21,730
Debt and preferred equity investments, discount and deferred origination fees	$ 14,935	$ 18,759
Preferred stock, par value (in dollars per share)	$ 0.01
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	160,000,000	160,000,000
Common stock, shares issued (in shares)	100,168,000	100,063,000
Common stock, shares outstanding (in shares)	100,168,000	100,063,000
Treasury stock, shares (in shares)	87,000	87,000
Series I Preferred Stock
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, liquidation preference (in dollars per share)	$ 25	$ 25
Preferred stock, shares issued (in shares)	9,200,000	9,200,000
Preferred stock, shares outstanding (in shares)	9,200,000	9,200,000
SL Green Operating Partnership
Tenant and other receivables, allowance	$ 17,829	$ 17,618
Deferred rents receivable, allowance	23,088	21,730
Debt and preferred equity investments, discount and deferred origination fees	$ 14,935	$ 18,759
Limited partner interests in Operating Partnership, limited partner common units outstanding (shares)	4,001,000	3,746,000
SL Green partner's capital, general partner common units outstanding (shares)	1,041,000	1,035,000
SL Green partners' capital, limited partner common units outstanding (shares)	99,041,000	98,941,000
SL Green Operating Partnership | Series I Preferred Stock
Preferred units, liquidation preference (in dollars per share)	$ 25	$ 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
	Mar. 31, 2016	Mar. 31, 2015
Revenues
Rental revenue, net	$ 345,607	$ 303,329
Escalation and reimbursement	45,611	40,969
Investment income	54,737	42,069
Other income	9,489	9,932
Total revenues	455,444	396,299
Expenses
Operating expenses, including $3,462 in 2016 and $3,808 in 2015 of related party expenses	79,520	76,777
Real estate taxes	61,674	55,723
Ground rent	8,308	8,188
Interest expense, net of interest income	94,672	75,807
Amortization of deferred financing costs	7,932	6,615
Depreciation and amortization	179,308	108,337
Transaction related costs	1,279	1,143
Marketing, general and administrative	24,032	25,464
Total expenses	456,725	358,054
(Loss) income from continuing operations before equity in net income from unconsolidated joint ventures, equity in net gain on sale of interest in unconsolidated joint venture/real estate, gain on sale of real estate and loss on early extinguishment of debt	(1,281)	38,245
Equity in net income from unconsolidated joint ventures	10,096	4,030
Equity in net gain on sale of interest in unconsolidated joint venture/real estate	9,915	0
Gain on sale of real estate, net	13,773	0
Loss on early extinguishment of debt	0	(49)
Income from continuing operations	32,503	42,226
Net income from discontinued operations	0	427
Gain on sale of discontinued operations	0	12,983
Net income	32,503	55,636
Net income attributable to noncontrolling interests:
Noncontrolling interests in the Operating Partnership	(922)	(1,743)
Net income attributable to noncontrolling interests in other partnerships	(1,974)	(5,927)
Preferred unit distributions	(2,648)	(951)
Net income (loss) attributable to SL Green/SLGOP	26,959	47,015
Perpetual preferred stock dividends	(3,738)	(3,738)
Amounts attributable to SL Green common stockholders:
Income from continuing operations before purchase price fair value adjustment, gains on sale and discontinued operations	438	30,387
Equity in net gain on sale of interest in unconsolidated joint venture/real estate	9,536	0
Net income from discontinued operations	0	410
Gain on sale of discontinued operations	0	12,480
Gain on sale of real estate	13,247	0
Net income attributable to SL Green common stockholders	$ 23,221	$ 43,277
Basic earnings per share:
Income from continuing operations before purchase price fair value adjustment, gains on sale and discontinued operations (usd per share)	$ 0	$ 0.31
Equity in net gain on sale of interest in unconsolidated joint venture/real estate (usd per share)	0.10	0
Net income from discontinued operations (usd per share)	0	0
Gain on sale of discontinued operations (usd per share)	0	0.13
Gain on sale of real estate (in dollars per share)	0.13	0
Net income attributable to SL Green common stockholders (usd per share)	0.23	0.44
Diluted earnings per share:
Income from continuing operations before purchase price fair value adjustment, gains on sale and discontinued operations (usd per share)	0	0.31
Equity in net gain on sale of interest in unconsolidated joint venture/real estate (usd per share)	0.10	0
Net income from discontinued operations (usd per share)	0	0
Gain on sale of discontinued operations (usd per share)	0	0.13
Gain on sale of real estate (in dollars per share)	0.13	0
Net income attributable to SL Green common stockholders (usd per share)	0.23	0.44
Dividends per share/unit (usd per share)	$ 0.72	$ 0.60
Basic weighted average common shares outstanding (in shares)	100,051	98,402
Diluted weighted average common shares and common share equivalents outstanding (in shares)	104,259	103,019
SL Green Operating Partnership
Revenues
Rental revenue, net	$ 345,607	$ 303,329
Escalation and reimbursement	45,611	40,969
Investment income	54,737	42,069
Other income	9,489	9,932
Total revenues	455,444	396,299
Expenses
Operating expenses, including $3,462 in 2016 and $3,808 in 2015 of related party expenses	79,520	76,777
Real estate taxes	61,674	55,723
Ground rent	8,308	8,188
Interest expense, net of interest income	94,672	75,807
Amortization of deferred financing costs	7,932	6,615
Depreciation and amortization	179,308	108,337
Transaction related costs	1,279	1,143
Marketing, general and administrative	24,032	25,464
Total expenses	456,725	358,054
(Loss) income from continuing operations before equity in net income from unconsolidated joint ventures, equity in net gain on sale of interest in unconsolidated joint venture/real estate, gain on sale of real estate and loss on early extinguishment of debt	(1,281)	38,245
Equity in net income from unconsolidated joint ventures	10,096	4,030
Equity in net gain on sale of interest in unconsolidated joint venture/real estate	9,915	0
Gain on sale of real estate, net	13,773	0
Loss on early extinguishment of debt	0	(49)
Income from continuing operations	32,503	42,226
Net income from discontinued operations	0	427
Gain on sale of discontinued operations	0	12,983
Net income	32,503	55,636
Net income attributable to noncontrolling interests:
Noncontrolling interests in the Operating Partnership	(922)
Net income attributable to noncontrolling interests in other partnerships	(1,974)	(5,927)
Preferred unit distributions	(2,648)	(951)
Net income (loss) attributable to SL Green/SLGOP	27,881	48,758
Perpetual preferred unit distributions	(3,738)	(3,738)
Net income attributable to SLGOP common unitholders	24,143	45,020
Amounts attributable to SL Green common stockholders:
Income from continuing operations before purchase price fair value adjustment, gains on sale and discontinued operations	455	31,610
Equity in net gain on sale of interest in unconsolidated joint venture/real estate	9,915	0
Net income from discontinued operations	0	427
Gain on sale of discontinued operations	0	12,983
Gain on sale of real estate	13,773	0
Net income attributable to SL Green common stockholders	$ 24,143	$ 45,020
Basic earnings per share:
Income from continuing operations before gains on sale and discontinued operations (usd per share)	$ 0	$ 0.31
Equity in net gain on sale of interest in unconsolidated joint venture/real estate (usd per share)	0.10	0
Net income from discontinued operations (usd per share)	0	0
Gain on sale of discontinued operations (usd per share)	0	0.13
Gain on sale of real estate (in dollars per share)	0.13	0
Net income attributable to SLGOP common unitholders (usd per share)	0.23	0.44
Diluted earnings per share:
Income from continuing operations before gains on sale and discontinued operations (usd per share)	0	0.31
Equity in net gain on sale of interest in unconsolidated joint venture/real estate (usd per share)	0.10	0
Net income from discontinued operations (usd per share)	0	0
Gain on sale of discontinued operations (usd per share)	0	0.13
Gain on sale of real estate (in dollars per share)	0.13	0
Net income attributable to SLGOP common unitholders (usd per share)	0.23	0.44
Dividends per share/unit (usd per share)	$ 0.72	$ 0.6
Basic weighted average common shares outstanding (in shares)	104,025	102,366
Basic weighted average common units outstanding (in shares)	104,025	102,366
Diluted weighted average common units and common unit equivalents outstanding (in shares)	104,259	103,019

Consolidated Statements of Ope5

Consolidated Statements of Operations (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Operating expenses, paid to related parties	$ 3,462	$ 3,808
SL Green Operating Partnership
Operating expenses, paid to related parties	$ 3,462	$ 3,808

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Net income	$ 32,503	$ 55,636
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	(7,572)	(5,680)
Change in unrealized (loss) gain on marketable securities	(1,223)	650
Other comprehensive (loss) income	(8,795)	(5,030)
Comprehensive income	23,708	50,606
Net income attributable to noncontrolling interests and preferred units distributions	(5,544)	(8,621)
Other comprehensive income (loss) attributable to noncontrolling interests	322	200
Comprehensive income attributable to SL Green/SLGOP	18,486	42,185
SL Green Operating Partnership
Net income	32,503	55,636
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	(7,572)	(5,680)
Change in unrealized (loss) gain on marketable securities	(1,223)	650
Other comprehensive (loss) income	(8,795)	(5,030)
Comprehensive income	23,708	50,606
Net income attributable to noncontrolling interests and preferred units distributions	(1,974)	(5,927)
Other comprehensive income (loss) attributable to noncontrolling interests	322	200
Comprehensive income attributable to SL Green/SLGOP	$ 22,056	$ 44,879

Consolidated Statement of Equit

Consolidated Statement of Equity - 3 months ended Mar. 31, 2016 - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid- In-Capital	Treasury Stock	Accumulated Other Comprehensive Income (Loss)	Retained Earnings	Noncontrolling Interests	Series C Preferred StockPreferred Stock	Series I Preferred StockPreferred Stock
Beginning Balance at Dec. 31, 2015	$ 7,719,317	$ 1,001	$ 5,439,735	$ (10,000)	$ (8,749)	$ 1,643,546	$ 431,852	$ 0	$ 221,932
Beginning Balance (in shares) at Dec. 31, 2015		99,976
Increase (Decrease) in Stockholders' Equity
Net income	28,933					26,959	1,974
Other comprehensive loss	(8,473)				(8,473)
Preferred dividends	(3,738)					(3,738)
DRSPP proceeds	45		45
Conversion of units of the Operating Partnership to common stock (in shares)		63
Conversion of units of the Operating Partnership to common stock	7,153	$ 1	7,152
Reallocation of noncontrolling interest in the Operating Partnership	25,867					25,867
Deferred compensation plan and stock award, net (in shares)		25
Deferred compensation plan and stock award, net	(2,220)		(2,220)
Amortization of deferred compensation plan	5,864		5,864
Proceeds from stock options exercised (in shares)		17
Proceeds from stock options exercised	1,211		1,211
Contributions to consolidated joint venture interests	934						934
Cash distributions to noncontrolling interests	(7,905)						(7,905)
Cash distributions declared ($0.72 per common share, none of which represented a return of capital for federal income tax purposes)	(71,965)					(71,965)
Ending Balance at Mar. 31, 2016	$ 7,695,023	$ 1,002	$ 5,451,787	$ (10,000)	$ (17,222)	$ 1,620,669	$ 426,855	$ 0	$ 221,932
Ending Balance (in shares) at Mar. 31, 2016		100,081

Consolidated Statement of Equi8

Consolidated Statement of Equity (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Statement of Stockholders' Equity [Abstract]
Cash distribution declared, per common share (in dollars per share)	$ 0.72	$ 0.60

Consolidated Statement of Capit

Consolidated Statement of Capital shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2016USD ($)shares
Increase (Decrease) in Partner's Capital
DRSPP proceeds	$ 45
Conversion of common units	7,153
Reallocation of noncontrolling interests in the operating partnership	25,867
Deferred compensation plan and stock award, net	(2,220)
Amortization of deferred compensation plan	5,864
Contribution to consolidated joint venture interests	934
Cash distributions to noncontrolling interests	(7,905)
Common Stock
Increase (Decrease) in Partner's Capital
Conversion of common units	$ 1
Deferred compensation plan and stock award, net (in units) | shares	25
Contributions - proceeds from stock options exercised (in units) | shares	17
Noncontrolling Interests
Increase (Decrease) in Partner's Capital
Contribution to consolidated joint venture interests	$ 934
Cash distributions to noncontrolling interests	(7,905)
SL Green Operating Partnership
Increase (Decrease) in Partner's Capital
Beginning Balance	7,719,317
Net income	28,933
Other comprehensive (loss)	(8,473)
Preferred distributions	(3,738)
DRSPP proceeds	45
Conversion of common units	7,153
Reallocation of noncontrolling interests in the operating partnership	25,867
Deferred compensation plan and stock award, net	(2,220)
Amortization of deferred compensation plan	5,864
Contribution to consolidated joint venture interests	934
Contributions - proceeds from stock options exercised	1,211
Cash distributions to noncontrolling interests	(7,905)
Cash distributions declared ($0.72 per common unit, none of which represented a return of capital for federal income tax purposes)	(71,965)
Ending Balance	7,695,023
SL Green Operating Partnership | Preferred Units | Series C Preferred Stock
Increase (Decrease) in Partner's Capital
Beginning Balance	0
Ending Balance	0
SL Green Operating Partnership | Preferred Units | Series I Preferred Stock
Increase (Decrease) in Partner's Capital
Beginning Balance	221,932
Ending Balance	221,932
SL Green Operating Partnership | Common Stock | Partners' Interest
Increase (Decrease) in Partner's Capital
Beginning Balance	$ 7,074,282
Beginning Balance (units) | shares	99,976
Net income	$ 26,959
Preferred distributions	(3,738)
DRSPP proceeds	$ 45
Conversion of common units (in units) | shares	63
Conversion of common units	$ 7,153
Reallocation of noncontrolling interests in the operating partnership	$ 25,867
Deferred compensation plan and stock award, net (in units) | shares	25
Deferred compensation plan and stock award, net	$ (2,220)
Amortization of deferred compensation plan	$ 5,864
Contributions - proceeds from stock options exercised (in units) | shares	17
Contributions - proceeds from stock options exercised	$ 1,211
Cash distributions declared ($0.72 per common unit, none of which represented a return of capital for federal income tax purposes)	(71,965)
Ending Balance	$ 7,063,458
Ending Balance (units) | shares	100,081
SL Green Operating Partnership | Accumulated Other Comprehensive Income (Loss)
Increase (Decrease) in Partner's Capital
Beginning Balance	$ (8,749)
Other comprehensive (loss)	(8,473)
Ending Balance	(17,222)
SL Green Operating Partnership | Noncontrolling Interests
Increase (Decrease) in Partner's Capital
Beginning Balance	431,852
Net income	1,974
Contribution to consolidated joint venture interests	934
Cash distributions to noncontrolling interests	(7,905)
Ending Balance	$ 426,855

Consolidated Statement of Cap10

Consolidated Statement of Capital (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Cash distribution declared, per common share (in dollars per share)	$ 0.72	$ 0.60
SL Green Operating Partnership
Cash distribution declared, per common share (in dollars per share)	$ 0.72	$ 0.6

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Operating Activities
Net income	$ 32,503	$ 55,636
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	187,240	114,955
Equity in net income from unconsolidated joint ventures	(10,096)	(4,030)
Distributions of cumulative earnings from unconsolidated joint ventures	8,891	15,489
Equity in net gain on sale of interest in unconsolidated joint venture interest/real estate	(9,915)	0
Gain on sale of real estate	(13,773)	0
Gain on sale of discontinued operations	0	(12,983)
Loss on early extinguishment of debt	0	49
Deferred rents receivable	(652)	(32,367)
Other non-cash adjustments	(14,920)	4,590
Changes in operating assets and liabilities:
Restricted cash—operations	(5,318)	(1,652)
Tenant and other receivables	7,829	7,096
Related party receivables	(4,503)	(353)
Deferred lease costs	(13,133)	(11,017)
Other assets	(46,736)	(38,280)
Accounts payable, accrued expenses and other liabilities and security deposits	(20,630)	(20,230)
Deferred revenue and land leases payable	17,303	14,056
Net cash provided by operating activities	114,090	90,959
Investing Activities
Acquisitions of real estate property	(37,728)	(6,290)
Additions to land, buildings and improvements	(62,500)	(47,117)
Escrowed cash—capital improvements/acquisition deposits/deferred purchase price	60,059	(3,084)
Investments in unconsolidated joint ventures	(6,603)	(83,772)
Distributions in excess of cumulative earnings from unconsolidated joint ventures	95,004	45,546
Net proceeds from disposition of real estate/joint venture interest	139,594	485,540
Proceeds from sale of marketable securities	0	133
Purchases of marketable securities	0	(7,769)
Other investments	(4,103)	(5,424)
Origination of debt and preferred equity investments	(117,119)	(174,420)
Repayments or redemption of debt and preferred equity investments	272,253	26,954
Net cash provided by investing activities	338,857	230,297
Financing Activities
Proceeds from mortgages and other loans payable	227,892	0
Repayments of mortgages and other loans payable	(127,695)	(481,608)
Proceeds from revolving credit facility and senior unsecured notes	520,000	665,000
Repayments of revolving credit facility and senior unsecured notes	(994,296)	(530,000)
Proceeds from stock options exercised and DRIP issuance	1,256	109,840
Proceeds from sale of common stock	0	120,597
Redemption of preferred stock	(440)	(200)
Distributions to noncontrolling interests in other partnerships	(7,905)	(110,867)
Contributions from noncontrolling interests in other partnerships	934	0
Distributions to noncontrolling interests in the Operating Partnership	(2,881)	(2,349)
Dividends/Distributions paid on common and preferred stock/units	(78,103)	(62,903)
Other obligations related to mortgage loan participations	76,500	25,000
Deferred loan costs and capitalized lease obligation	(7,403)	(4,405)
Net cash used in financing activities	(392,141)	(271,895)
Net increase in cash and cash equivalents	60,806	49,361
Cash and cash equivalents at beginning of year	255,399	281,409
Cash and cash equivalents at end of period	316,205	330,770
Supplemental Disclosure of Non-Cash Investing and Financing Activities:
Issuance of common stock as deferred compensation	2,195	1,306
Issuance of units in the operating partnership	18,140	22,114
Redemption of units in the operating partnership	7,153	37,407
Derivative instruments at fair value	8,141	4,426
Exchange of debt investment for equity in joint venture	68,581	10,151
Transfer of restricted cash to operating cash and cash equivalents as a result of sale	0	21,578
Acquisition of subsidiary interest from noncontrolling interest	0	3,500
Tenant improvements and capital expenditures payable	18,165	17,664
Fair value adjustment to noncontrolling interest in operating partnership	25,867	45,456
Transfer of assets to assets held for sale	1,891,575	0
Transfer of liabilities related to assets held for sale	1,612,001	0
Deferred leasing payable	1,699	2,372
Removal of fully depreciated commercial real estate properties	4,822	0
SL Green Operating Partnership
Operating Activities
Net income	32,503	55,636
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	187,240	114,955
Equity in net income from unconsolidated joint ventures	(10,096)	(4,030)
Distributions of cumulative earnings from unconsolidated joint ventures	8,891	15,489
Equity in net gain on sale of interest in unconsolidated joint venture interest/real estate	(9,915)	0
Gain on sale of real estate	(13,773)	0
Gain on sale of discontinued operations	0	(12,983)
Loss on early extinguishment of debt	0	49
Deferred rents receivable	(652)	(32,367)
Other non-cash adjustments	(14,920)	4,590
Changes in operating assets and liabilities:
Restricted cash—operations	(5,318)	(1,652)
Tenant and other receivables	7,829	7,096
Related party receivables	(4,503)	(353)
Deferred lease costs	(13,133)	(11,017)
Other assets	(46,736)	(38,280)
Accounts payable, accrued expenses and other liabilities and security deposits	(20,630)	(20,230)
Deferred revenue and land leases payable	17,303	14,056
Net cash provided by operating activities	114,090	90,959
Investing Activities
Acquisitions of real estate property	(37,728)	(6,290)
Additions to land, buildings and improvements	(62,500)	(47,117)
Escrowed cash—capital improvements/acquisition deposits/deferred purchase price	60,059	(3,084)
Investments in unconsolidated joint ventures	(6,603)	(83,772)
Distributions in excess of cumulative earnings from unconsolidated joint ventures	95,004	45,546
Net proceeds from disposition of real estate/joint venture interest	139,594	485,540
Proceeds from sale of marketable securities	0	133
Purchases of marketable securities	0	(7,769)
Other investments	(4,103)	(5,424)
Origination of debt and preferred equity investments	(117,119)	(174,420)
Repayments or redemption of debt and preferred equity investments	272,253	26,954
Net cash provided by investing activities	338,857	230,297
Financing Activities
Proceeds from mortgages and other loans payable	227,892	0
Repayments of mortgages and other loans payable	(127,695)	(481,608)
Proceeds from revolving credit facility and senior unsecured notes	520,000	665,000
Repayments of revolving credit facility and senior unsecured notes	(994,296)	(530,000)
Proceeds from stock options exercised and DRIP issuance	1,256	109,840
Proceeds from sale of common stock	0	120,597
Redemption of preferred stock	(440)	(200)
Distributions to noncontrolling interests in other partnerships	(7,905)	(110,867)
Contributions from noncontrolling interests in other partnerships	934	0
Dividends/Distributions paid on common and preferred stock/units	(80,984)	(65,252)
Other obligations related to mortgage loan participations	76,500	25,000
Deferred loan costs and capitalized lease obligation	(7,403)	(4,405)
Net cash used in financing activities	(392,141)	(271,895)
Net increase in cash and cash equivalents	60,806	49,361
Cash and cash equivalents at beginning of year	255,399	281,409
Cash and cash equivalents at end of period	316,205	330,770
Supplemental Disclosure of Non-Cash Investing and Financing Activities:
Issuance of common stock as deferred compensation	2,195	1,306
Issuance of units in the operating partnership	18,140	22,114
Redemption of units in the operating partnership	7,153	37,407
Derivative instruments at fair value	8,141	4,426
Exchange of debt investment for equity in joint venture	68,581	10,151
Transfer of restricted cash to operating cash and cash equivalents as a result of sale	0	21,578
Acquisition of subsidiary interest from noncontrolling interest	0	3,500
Tenant improvements and capital expenditures payable	18,165	17,664
Fair value adjustment to noncontrolling interest in operating partnership	25,867	0
Transfer of assets to assets held for sale	1,891,575	0
Transfer of liabilities related to assets held for sale	1,612,001	0
Deferred leasing payable	1,699	2,372
Removal of fully depreciated commercial real estate properties	4,822	0
Preferred Units
Supplemental Disclosure of Non-Cash Investing and Financing Activities:
Issuance of preferred units relating to the real estate acquisition	22,750	0
Issuance of preferred units (Stonehenge)	0	40,000
Preferred Units | SL Green Operating Partnership
Supplemental Disclosure of Non-Cash Investing and Financing Activities:
Issuance of preferred units relating to the real estate acquisition	22,750	0
Issuance of preferred units (Stonehenge)	$ 0	$ 40,000

Organization and Basis of Prese

Organization and Basis of Presentation	3 Months Ended
	Mar. 31, 2016
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. 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 March 31, 2016 , noncontrolling investors held, in the aggregate, a 3.84% limited partnership interest in the Operating Partnership. We refer to these interests as the noncontrolling interests in the Operating Partnership. The Operating Partnership is considered a variable interest entity, or VIE, in which we are the primary beneficiary. See Note 11, "Noncontrolling Interests on the Company's Consolidated Financial Statements." Reckson Associates Realty Corp., or Reckson, and Reckson Operating Partnership, L.P., or ROP, are wholly-owned subsidiaries of SL Green Realty Corp. As of March 31, 2016 , we owned the following interests in properties in the New York Metropolitan area, primarily in midtown Manhattan. Our investments in the New York Metropolitan area also include investments in Brooklyn, Long Island, Westchester County, Connecticut and New Jersey, which are collectively known as the Suburban properties: Consolidated Unconsolidated Total Location Property Type Number of Properties Approximate Square Feet (unaudited) Number of Properties Approximate Square Feet (unaudited) Number of Properties Approximate Square Feet (unaudited) Weighted Average Occupancy (1) (unaudited) Commercial: Manhattan Office 27 (2) 21,003,606 6 4,244,139 33 25,247,745 95.9 % Retail 10 (3) 418,093 9 347,970 19 766,063 88.1 % Development/Redevelopment 3 42,635 3 733,624 6 776,259 30.5 % Fee Interest 1 176,530 — — 1 176,530 100.0 % 41 21,640,864 18 5,325,733 59 26,966,597 93.8 % Suburban Office 26 4,235,300 2 640,000 28 4,875,300 81.7 % Retail 1 52,000 — — 1 52,000 100.0 % Development/Redevelopment 1 1,000 1 — 2 1,000 100.0 % 28 4,288,300 3 640,000 31 4,928,300 81.9 % Total commercial properties 69 25,929,164 21 5,965,733 90 31,894,897 92.0 % Residential: Manhattan Residential 4 (3) 762,587 17 2,193,424 21 2,956,011 95.4 % Suburban Residential — — — — — — — % Total residential properties 4 762,587 17 2,193,424 21 2,956,011 95.4 % Total portfolio (3) 73 26,691,751 38 8,159,157 111 34,850,908 92.3 % ____________________________________________________________________ (1) The weighted average occupancy for commercial properties represents the total occupied square feet divided by total acquisition square footage. The weighted average occupancy for residential properties represents the total occupied units divided by total available units. (2) Includes the property at 388-390 Greenwich Street, which is classified as held for sale at March 31, 2016. (3) As of March 31, 2016 , we owned a building that was comprised of approximately 270,132 square feet (unaudited) of retail space and approximately 222,855 square feet (unaudited) of residential space. For the purpose of this report, we have included the building in the retail properties count and have bifurcated the square footage into the retail and residential components. As of March 31, 2016 , we also managed an approximately 336,000 square foot (unaudited) office building owned by a third party and held debt and preferred equity investments with a book value of $1.7 billion including $0.3 billion of debt and preferred equity investments and other financing receivables that are included in other balance sheet line items. Partnership Agreement In accordance with the partnership agreement of the Operating Partnership, or the Operating Partnership Agreement, we allocate all distributions and profits and losses in proportion to the percentage of ownership interests of the respective partners. As the managing general partner of the Operating Partnership, we are required to take such reasonable efforts, as determined by us in our sole discretion, to cause the Operating Partnership to distribute sufficient amounts to enable the payment of sufficient dividends by us to minimize any Federal income or excise tax at the Company level. Under the Operating Partnership Agreement, each limited partner has the right to redeem units of limited partnership interests for cash, or if we so elect, shares of SL Green's common stock on a one-for- one basis. Basis of Quarterly Presentation The accompanying unaudited consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and notes required by accounting principles generally accepted in the United States for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for the fair presentation of the financial position of the Company and the Operating Partnership at March 31, 2016 and the results of operations for the periods presented have been included. The operating results for the period presented are not necessarily indicative of the results that may be expected for the year ending December 31, 2016 . These financial statements should be read in conjunction with the financial statements and accompanying notes included in the Annual Report on Form 10-K for the year ended December 31, 2015 of the Company and the Operating Partnership. The consolidated balance sheets at December 31, 2015 have been derived from the audited financial statements as of that date but do not include all the information and footnotes required by accounting principles generally accepted in the United States for complete financial statements.

Significant Accounting Policies

Significant Accounting Policies	3 Months Ended
	Mar. 31, 2016
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 March 31, 2016 and December 31, 2015 are $1.8 billion and $200.7 million , respectively, related to our consolidated VIEs. Included in mortgages and other loans payable on our consolidated balance sheets as of March 31, 2016 and December 31, 2015 are $673.9 million and $104.5 million , respectively, collateralized by the real estate assets of the related consolidated VIEs. As of March 31, 2016 , assets held for sale and liabilities related to assets held for sale on the consolidated balance sheets did not include amounts related to consolidated VIEs. A noncontrolling interest in a consolidated subsidiary is defined as the portion of the equity (net assets) in a subsidiary not attributable, directly or indirectly, to us. Noncontrolling interests are required to be presented as a separate component of equity in the consolidated balance sheet and the presentation of net income is modified to present earnings and other comprehensive income attributed to controlling and noncontrolling interests. We assess the accounting treatment for each joint venture and debt and preferred equity investment. This assessment includes a review of each joint venture or limited liability company agreement to determine which party has what rights and whether those rights are protective or participating. For all VIEs, we review such agreements in order to determine which party has the power to direct the activities that most significantly impact the entity's economic performance. In situations where we and our partner approve, among other things, the annual budget, receive a detailed monthly reporting package, meet on a quarterly basis to review the results of the joint venture, review and approve the joint venture's tax return before filing, and approve all leases that cover more than a nominal amount of space relative to the total rentable space at each property, we do not consolidate the joint venture as we consider these to be substantive participation rights that result in shared power of the activities that most significantly impact the performance of the joint venture. Our joint venture agreements typically contain certain protective rights such as requiring partner approval to sell, finance or refinance the property and the payment of capital expenditures and operating expenditures outside of the approved budget or operating plan. Investment in Commercial Real Estate Properties On a periodic basis, we assess whether there are any indications that the value of our real estate properties may be other than temporarily impaired or that their carrying value may not be recoverable. A property's value is considered impaired if management's estimate of the aggregate future cash flows (undiscounted and without interest charges for consolidated properties) to be generated by the property is less than the carrying value of the property. To the extent impairment has occurred, the loss will be measured as the excess of the carrying amount of the property over the calculated fair value of the property. We also evaluate our real estate properties for potential impairment when a real estate property has been classified as held for sale. Real estate assets held for sale are valued at the lower of either their carrying value or fair value less costs to sell. We do not believe that there were any indicators of impairment at any of our consolidated properties at March 31, 2016 . We allocate the purchase price of real estate to land and building (inclusive of tenant improvements) and, if determined to be material, intangibles, such as the value of above- and below-market leases and origination costs associated with the in-place leases. We depreciate the amount allocated to building (inclusive of tenant improvements) over their estimated useful lives, which generally range from three to 40 years . We amortize the amount allocated to the above- and below-market leases over the remaining term of the associated lease, which generally range from one to 14 years, and record it as either an increase (in the case of below-market leases) or a decrease (in the case of above-market leases) to rental income. We amortize the amount allocated to the values associated with in-place leases over the expected term of the associated lease, which generally ranges from one to 14 years. If a tenant vacates its space prior to the contractual termination of the lease and no rental payments are being made on the lease, any unamortized balance of the related intangible will be written off. The tenant improvements and origination costs are amortized as an expense over the remaining life of the lease (or charged against earnings if the lease is terminated prior to its contractual expiration date). We assess fair value of the leases based on estimated cash flow projections that utilize appropriate discount and capitalization rates and available market information. Estimates of future cash flows are based on a number of factors including the historical operating results, known trends, and market/economic conditions that may affect the property. To the extent acquired leases contain fixed rate renewal options that are below-market and determined to be material, we amortize such below-market lease value into rental income over the renewal period. We recognized $34.8 million and $14.3 million of rental revenue for the three months ended March 31, 2016 and 2015 , respectively, for the amortization of aggregate below-market leases in excess of above-market leases and a reduction in lease origination costs, resulting from the allocation of the purchase price of the applicable properties.We recognized as a reduction to interest expense the amortization of the above-market rate mortgages assumed of $0.6 million for both the three months ended March 31, 2016 and 2015 . The following summarizes our identified intangible assets (acquired above-market leases and in-place leases) and intangible liabilities (acquired below-market leases) as of March 31, 2016 and December 31, 2015 (in thousands): March 31, 2016 December 31, 2015 Identified intangible assets (included in other assets): Gross amount $ 1,022,698 $ 939,518 Accumulated amortization (407,401 ) (403,747 ) Net (1) $ 615,297 $ 535,771 Identified intangible liabilities (included in deferred revenue): Gross amount $ 863,882 $ 866,561 Accumulated amortization (489,674 ) (486,928 ) Net (1) $ 374,208 $ 379,633 ____________________________________________________________________ (1) As of March 31, 2016 and December 31, 2015, $242.8 million and $0.2 million , respectively and $149.9 million and $0.1 million , respectively, of net intangible assets and net intangible liabilities, were reclassified to assets held for sale and liabilities related to assets held for sale. In February 2016, we closed on the sale of 885 Third Avenue but did not meet the criteria for sale accounting under the full accrual method in ASC 360-20, Property, Plant and Equipment - Real Estate Sales. As a result the property remains on our consolidated balance sheet until the criteria is met. Fair Value Measurements See Note 16, "Fair Value Measurements." Investment in Marketable Securities We designate a security as held-to-maturity, available-for-sale, or trading at acquisition. As of March 31, 2016 , we did not have any securities designated as held-to-maturity or trading. We account for our available-for-sale securities at fair value pursuant to Accounting Standards Codification, or ASC, 820-10, with the net unrealized gains or losses reported as a component of accumulated other comprehensive income or loss. Any unrealized losses that are determined to be other-than-temporary are recognized in earnings up to their credit component. The cost of bonds and marketable securities sold is determined using the specific identification method. At March 31, 2016 and December 31, 2015 , we held the following marketable securities (in thousands): March 31, 2016 December 31, 2015 Equity marketable securities $ 4,132 $ 4,704 Commercial mortgage-backed securities 39,783 40,434 Total marketable securities available-for-sale $ 43,915 $ 45,138 The cost basis of the commercial mortgage-backed securities was $38.7 million at both March 31, 2016 and December 31, 2015 . These securities mature at various times through 2049. We did not sell any of our marketable securities during the three months ended March 31, 2016. During the three months ended March 31, 2015, we disposed of marketable securities for aggregate net proceeds of $0.1 million . Investments in Unconsolidated Joint Ventures We assess our investments in unconsolidated joint ventures for recoverability, and if it is determined that a loss in value of the investment is other than temporary, we write down the investment to its fair value. We evaluate our equity investments for impairment based on the joint ventures' projected discounted cash flows. We do not believe that the values of any of our equity investments were impaired at March 31, 2016 . We may originate loans for real estate acquisition, development and construction, where we expect to receive some of the residual profit from such projects. When the risk and rewards of these arrangements are essentially the same as an investor or joint venture partner, we account for these arrangements as real estate investments under the equity method of accounting for investments. Otherwise, we account for these arrangements consistent with our loan accounting for our debt and preferred equity investments. Revenue Recognition Rental revenue is recognized on a straight-line basis over the term of the lease. Rental revenue recognition commences when the tenant takes possession or controls the physical use of the leased space. In order for the tenant to take possession, the leased space must be substantially ready for its intended use. To determine whether the leased space is substantially ready for its intended use, management evaluates whether we are or the tenant is the owner of tenant improvements for accounting purposes. When management concludes that we are the owner of tenant improvements, rental revenue recognition begins when the tenant takes possession of the finished space, which is when such tenant improvements are substantially complete. In certain instances, when management concludes that we are not the owner (the tenant is the owner) of tenant improvements, rental revenue recognition begins when the tenant takes possession of or controls the space. When management concludes that we are the owner of tenant improvements for accounting purposes, we record amounts funded to construct the tenant improvements as a capital asset. For these tenant improvements, we record amounts reimbursed by tenants as a reduction of the capital asset. When management concludes that the tenant is the owner of tenant improvements for accounting purposes, we record our contribution towards those improvements as a lease incentive, which is included in deferred costs, net on our consolidated balance sheets and amortized as a reduction to rental revenue on a straight-line basis over the term of the lease. The excess of rents recognized over amounts contractually due pursuant to the underlying leases are included in deferred rents receivable on the consolidated balance sheets. We establish, on a current basis, an allowance for future potential tenant credit losses, which may occur against this account. The balance reflected on the consolidated balance sheets is net of such allowance. In addition to base rent, our tenants also generally will pay their pro rata share of increases in real estate taxes and operating expenses for the building over a base year. In some leases, in lieu of paying additional rent based upon increases in building operating expenses, the tenant will pay additional rent based upon increases in the wage rate paid to porters over the porters' wage rate in effect during a base year or increases in the consumer price index over the index value in effect during a base year. In addition, many of our leases contain fixed percentage increases over the base rent to cover escalations. Electricity is most often supplied by the landlord either on a sub-metered basis, or rent inclusion basis (i.e., a fixed fee is included in the rent for electricity, which amount may increase based upon increases in electricity rates or increases in electrical usage by the tenant). Base building services other than electricity (such as heat, air conditioning and freight elevator service during business hours, and base building cleaning) are typically provided at no additional cost, with the tenant paying additional rent only for services which exceed base building services or for services which are provided outside normal business hours. These escalations are based on actual expenses incurred in the prior calendar year. If the expenses in the current year are different from those in the prior year, then during the current year, the escalations will be adjusted to reflect the actual expenses for the current year. We record a gain on sale of real estate when title is conveyed to the buyer, subject to the buyer's financial commitment being sufficient to provide economic substance to the sale and provided that we have no substantial economic involvement with the buyer. Interest income on debt and preferred equity investments is accrued based on the outstanding principal amount and contractual terms of the instruments and when, in the opinion of management, it is deemed collectible. Some debt and preferred equity investments provide for accrual of interest at specified rates, which differ from current payment terms. Interest is recognized on such loans at the accrual rate subject to management's determination that accrued interest is ultimately collectible, based on the underlying collateral and operations of the borrower. If management cannot make this determination, interest income above the current pay rate is recognized only upon actual receipt. Deferred origination fees, original issue discounts and loan origination costs, if any, are recognized as an adjustment to the interest income over the terms of the related investments using the effective interest method. Fees received in connection with loan commitments are also deferred until the loan is funded and are then recognized over the term of the loan as an adjustment to yield. Discounts or premiums associated with the purchase of loans are amortized or accreted into interest income as a yield adjustment on the effective interest method based on expected cashflows through the expected maturity date of the related investment. If we purchase a debt or preferred equity investment at a discount, intend to hold it until maturity and expect to recover the full value of the investment, we accrete the discount into income as an adjustment to yield over the term of the investment. If we purchase a debt or preferred equity investment at a discount with the intention of foreclosing on the collateral, we do not accrete the discount. For debt investments acquired at a discount for credit quality, the difference between contractual cash flows and expected cash flows at acquisition is not accreted. Anticipated exit fees, the collection of which is expected, are also recognized over the term of the loan as an adjustment to yield. Debt and preferred equity investments are placed on a non-accrual status at the earlier of the date at which payments become 90 days past due or when, in the opinion of management, a full recovery of interest income becomes doubtful. Interest income recognition on any non-accrual debt or preferred equity investment is resumed when such non-accrual debt or preferred equity investment becomes contractually current and performance is demonstrated to be resumed. Interest is recorded as income on impaired loans only to the extent cash is received. We may syndicate a portion of the loans that we originate or sell the loans individually. When a transaction meets the criteria for sale accounting, we derecognize the loan sold and recognize gain or loss based on the difference between the sales price and the carrying value of the loan sold. Any related unamortized deferred origination fees, original issue discounts, loan origination costs, discounts or premiums at the time of sale are recognized as an adjustment to the gain or loss on sale, which is included in investment income on the consolidated statement of operations. Any fees received at the time of sale or syndication are recognized as part of investment income. Asset management fees are recognized on a straight-line basis over the term of the asset management agreement. Reserve for Possible Credit Losses The expense for possible credit losses in connection with debt and preferred equity investments is the charge to earnings to increase the allowance for possible credit losses to the level that we estimate to be adequate, based on Level 3 data, considering delinquencies, loss experience and collateral quality. Other factors considered include geographic trends, product diversification, the size of the portfolio and current economic conditions. Based upon these factors, we establish a provision for possible credit loss on each individual investment. When it is probable that we will be unable to collect all amounts contractually due, the investment is considered impaired. Where impairment is indicated on an investment that is held to maturity, a valuation allowance is measured based upon the excess of the recorded investment amount over the net fair value of the collateral. Any deficiency between the carrying amount of an asset and the calculated value of the collateral is charged to expense. We continue to assess or adjust our estimates based on circumstances of a loan and the underlying collateral. If additional information reflects increased recovery of our investment, we will adjust our reserves accordingly. There were no loan reserves recorded during three months ended March 31, 2016 and 2015. Debt and preferred equity investments held for sale are carried at the lower of cost or fair market value using available market information obtained through consultation with dealers or other originators of such investments as well as discounted cash flow models based on Level 3 data pursuant to ASC 820-10. As circumstances change, management may conclude not to sell an investment designated as held for sale. In such situations, the investment will be reclassified at its net carrying value to debt and preferred equity investments held to maturity. For these reclassified investments, the difference between the current carrying value and the expected cash to be collected at maturity will be accreted into income over the remaining term of the investment. Income Taxes SL Green is taxed as a REIT under Section 856(c) of the Code. As a REIT, SL Green generally is not subject to Federal income tax. To maintain its qualification as a REIT, SL Green must distribute at least 90% of its REIT taxable income to its stockholders and meet certain other requirements. If SL Green fails to qualify as a REIT in any taxable year, SL Green will be subject to Federal income tax on SL Green's taxable income at regular corporate rates. SL Green may also be subject to certain state, local and franchise taxes. Under certain circumstances, Federal income and excise taxes may be due on SL Green's undistributed taxable income. The Operating Partnership is a partnership and, as a result, all income and losses of the partnership are allocated to the partners for inclusion in their respective income tax returns. The only provision for income taxes included in the consolidated statements of operations relates to the Operating Partnership’s consolidated taxable REIT subsidiaries. The Operating Partnership may also be subject to certain state, local and franchise taxes. Pursuant to amendments to the Code that became effective January 1, 2001, we have elected, and may elect in the future, to treat certain of our existing or newly created corporate subsidiaries as taxable REIT subsidiaries, or TRSs. In general, TRSs may perform non-customary services for the tenants of the Company, hold assets that we cannot hold directly and generally may engage in any real estate or non-real estate related business. The TRSs generate income, resulting in Federal and state income tax liability for these entities. During the three months ended March 31, 2016 and 2015 , we recorded Federal, state and local tax provisions of $1.2 million and $0.3 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 9.1% , 8.5% and 5.9% , no other tenant in our portfolio accounted for more than 5.0% of our share of annualized cash rent, including our share of joint venture annualized rent, at March 31, 2016 . For the three months ended March 31, 2016 , 9.7% , 9.1% , 8.3% , 7.0% , 6.6% , 5.7% , and 5.0% of our annualized cash rent for consolidated properties was attributable to 11 Madison Avenue, 1515 Broadway, 388 and 390 Greenwich Street, 919 Third Avenue, 1185 Avenue of the Americas, 420 Lexington Avenue and One Madison Avenue, respectively. Annualized cash rent for all other consolidated properties was below 5.0% . Reclassification Certain prior year balances have been reclassified to conform to our current year presentation. Accounting Standards Updates In March 2016, the FASB issued Accounting Standards Update (ASU) No. 2016-09, Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting. The guidance simplifies the accounting for share-based payment award transactions including: income tax consequences, classification of awards as either equity or liabilities and classification on the statement of cash flows. The guidance is effective for fiscal years beginning after December 15, 2016, including interim periods within those fiscal years. Early adoption is permitted. The Company has not yet adopted this new guidance and is currently evaluating the impact of adopting this new accounting standard on the Company’s consolidated financial statements. In March 2016, the FASB issued ASU 2016-07, Investments Equity Method and Joint Ventures (Topic 323). The guidance eliminates the requirement that an entity retroactively adopt the equity method of accounting if an investment qualifies for use of the equity method as a result of an increase in the level of ownership or degree of influence. The amendments require that the equity method investor add the cost of acquiring the additional interest in the investee to the current basis of the investor’s previously held interest and adopt the equity method of accounting as of the date the investment becomes qualified for equity method accounting. The guidance is effective for all entities for fiscal years beginning after 15 December 2016 and interim periods within those years. Early adoption is permitted in any interim or annual period. The Company has not yet adopted this new guidance and is currently evaluating the impact of adopting this new accounting standard on the Company’s consolidated financial statements. In February 2016, the FASB issued ASU 2016-02, Leases. The guidance requires lessees to recognize lease assets and lease liabilities for those leases classified as operating leases under the previous standard. The accounting applied by a lessor is largely unchanged from that applied under the previous standard. The Guidance is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. Early adoption is permitted. The Company has not yet adopted this new guidance and is currently evaluating the impact of adopting this new accounting standard on the Company’s consolidated financial statements. In January 2016, the FASB issued ASU 2016-01 (ASU825-10), Recognition and Measurement of Financial Assets and Financial Liabilities. The guidance requires entities to measure equity investments that do not result in consolidation and are not accounted for under the equity method at fair value and to record changes in instruments-specific credit risk for financial liabilities measured under the fair value

Property Acquisitions

Property Acquisitions	3 Months Ended
	Mar. 31, 2016
Business Combinations [Abstract]
Property Acquisitions	Property Acquisitions 2016 Acquisitions During the three months ended March 31, 2016, the property listed below was acquired from a third party. The following summarizes our preliminary allocation of the purchase price of the assets acquired and liabilities assumed upon the closing of this acquisition (in thousands): 183 Broadway (1) Acquisition Date March 2016 Ownership Type Fee Interest Property Type Retail/Residential Purchase Price Allocation: Land $ 26,640 Building and building leasehold 2,960 Above-market lease value — Acquired in-place leases — Other assets, net of other liabilities — Assets acquired $ 29,600 Mark-to-market assumed debt — Below-market lease value — Derivatives — Liabilities assumed — Purchase price $ 29,600 Net consideration funded by us at closing, excluding consideration financed by debt $ 29,600 Equity and/or debt investment held $ — Debt assumed $ — (1) We are currently in the process of analyzing the purchase price allocation and, as such, we have not allocated any value to intangible assets such as above- and below-market lease or in-place leases. 2015 Acquisitions During the three months ended March 31, 2016, we finalized the purchase price allocations based on facts and circumstances that existed at the acquisition dates for the following 2015 acquisitions (in thousands): 11 Madison Avenue (1) 1640 Flatbush Avenue (1) Acquisition Date August 2015 March 2015 Ownership Type Fee Interest Fee Interest Property Type Office Retail Purchase Price Allocation: Land $ 675,776 $ 6,226 Building and building leasehold 1,553,602 501 Above-market lease value 19,764 — Acquired in-place leases 366,949 146 Other assets, net of other liabilities — — Assets acquired 2,616,091 6,873 Mark-to-market assumed debt — — Below-market lease value (187,732 ) (73 ) Derivatives — — Liabilities assumed (187,732 ) (73 ) Purchase price $ 2,428,359 $ 6,800 Net consideration funded by us at closing, excluding consideration financed by debt $ — $ — Equity and/or debt investment held $ — $ — Debt assumed $ — $ — (1) Based on our preliminary analysis of the purchase price, we had allocated $849.9 million and $1.6 billion to land and building, respectively, at 11 Madison Avenue and $6.1 million and $0.7 million to land and building, respectively, at 1640 Flatbush Avenue. The impact to our consolidated statement of operations for the three months ended March 31, 2016 was $6.0 million in rental revenue for the amortization of aggregate below-market leases and $15.4 million of depreciation expense.

Properties Held for Sale and Pr

Properties Held for Sale and Property Dispositions	3 Months Ended
	Mar. 31, 2016
Discontinued Operations and Disposal Groups [Abstract]
Properties Held for Sale and Property Dispositions	Properties Held for Sale and Property Dispositions Properties Held for Sale During the three months ended March 31, 2016 we determined that the held for sale criteria was met for 388-390 Greenwich Street. In April 2016, we entered into an agreement to accelerate the sale of our property at 388-390 Greenwich Street for $2.0 billion , net of $242.5 million of unfunded tenant concessions, pursuant to the purchase option that was exercised on the property in January 2016. The closing, which was previously scheduled for December 2017, is now scheduled for June 2016, subject to customary closing conditions. Property Dispositions The following table summarizes the properties sold during the three months ended March 31, 2016 : Property Disposition Date Property Type Approximate Square Feet Sales Price (1) (in millions) Gain on Sale (2) (in millions) 248-252 Bedford Avenue February 2016 Residential 66,611 $ 55.0 $ 13.8 885 Third Avenue (3) February 2016 Land 607,000 453.0 — ____________________________________________________________________ (1) Sales price represents the actual sales price for a property or the gross asset valuation for interests in a property. (2) The gain on sale for 248-252 Bedford Avenue is net of $1.3 million in employee compensation awards accrued in connection with the realization of the investment gain as a bonus to certain employees that were instrumental in realizing the gain on sale. Additionally, amounts do not include adjustments for expenses recorded in subsequent periods. (3) In February 2016, we closed on the sale of 885 Third Avenue. The sale did not meet the criteria for sale accounting and as a result the property remains on our consolidated balance sheet until the criteria is met. An estimated loss relating to the sale of $6.6 million was recorded in December 2015. Discontinued Operations The Company adopted ASU 2014-08 effective January 1, 2015 which raised the threshold for disposals to qualify as discontinued operations to dispositions which represent a strategic shift in an entity’s operations. The guidance was applied prospectively for new disposals. As a result, the results of operations for 388 Greenwich Street which was classified as held for sale at March 31, 2016 is included in continuing operations for the three months ended March 31, 2016. No properties were held for sale at March 31, 2015. Discontinued operations for the three months ended March 31, 2015 included the results of operations of 180 Maiden Lane, which was held for sale at December 31, 2014 and sold in January 2015, as follows (in thousands): March 31, 2015 Revenues Rental revenue $ 236 Escalation and reimbursement revenues (127 ) Other income — Total revenues 109 Operating expenses (631 ) Real estate taxes 250 Ground rent — Transaction related costs (49 ) Depreciable real estate reserves — Interest expense, net of interest income 109 Amortization of deferred financing costs 3 Depreciation and amortization — Total expenses (318 ) Net income from discontinued operations $ 427

Debt and Preferred Equity Inves

Debt and Preferred Equity Investments	3 Months Ended
	Mar. 31, 2016
Investments, Debt and Equity Securities [Abstract]
Debt and Preferred Equity Investments	Debt and Preferred Equity Investments During the three months ended March 31, 2016 and 2015 , our debt and preferred equity investments, net of discounts and deferred origination fees, increased $128.8 million and $166.9 million , respectively, due to originations, purchases, advances under future funding obligations, discount and fee amortization, and paid-in-kind interest, net of premium amortization. We recorded repayments, participations and sales of $420.2 million and $27.0 million during the three months ended March 31, 2016 and 2015 , respectively, which offset the increases in debt and preferred equity investments. Certain debt investments that were participated out but for which the transfer did not meet the conditions for sale accounting are included in other assets and other liabilities on the consolidated balance sheets. Debt Investments As of March 31, 2016 and December 31, 2015 we held the following debt investments with an aggregate weighted average current yield of 10.47% at March 31, 2016 (in thousands): Loan Type March 31, 2016 Future Funding Obligations March 31, 2016 Senior Financing March 31, 2016 Carrying Value (1) December 31, 2015 Carrying Value (1) Initial Maturity Date Fixed Rate Investments: Mezzanine Loan (2a) $ — $ 115,000 $ 12,917 $ 24,916 July 2016 Mezzanine Loan — 165,000 72,174 72,102 November 2016 Loan Type March 31, 2016 Future Funding Obligations March 31, 2016 Senior Financing March 31, 2016 Carrying Value (1) December 31, 2015 Carrying Value (1) Initial Maturity Date Jr. Mortgage Participation/Mezzanine Loan — 1,109,000 185,266 104,661 March 2017 Mezzanine Loan (2b) — 502,100 41,137 41,115 June 2017 Mezzanine Loan — 539,000 49,715 49,691 July 2018 Mortgage Loan (3) — — 26,275 26,262 February 2019 Mortgage Loan — — 480 513 August 2019 Mezzanine Loan — 15,000 3,500 3,500 September 2021 Mezzanine Loan (2c) — 89,527 19,937 19,936 November 2023 Mezzanine Loan — 95,000 30,000 30,000 January 2025 Jr. Mortgage Participation (4) — — — 49,000 Other (4)(5) — — — 23,510 Other (4)(5) — — — 66,183 Total fixed rate $ — $ 2,629,627 $ 441,401 $ 511,389 Floating Rate Investments: Mortgage/Mezzanine Loan (6) 4,693 — 100,837 94,901 April 2016 Mezzanine Loan (2d) — 160,000 22,639 22,625 June 2016 Mezzanine Loan (7) — 745,215 74,311 74,700 September 2016 Mezzanine Loan — 360,000 99,662 99,530 November 2016 Mezzanine Loan 10,003 136,384 51,217 49,751 December 2016 Mezzanine Loan 281 39,201 13,745 13,731 December 2016 Mortgage/Mezzanine Loan (2e) 47,001 — 133,395 134,264 January 2017 Mezzanine Loan 1,127 118,949 28,754 28,551 January 2017 Mezzanine Loan (2f)(8) — 40,000 15,132 68,977 June 2017 Mortgage/Mezzanine Loan — — 22,896 22,877 July 2017 Mortgage/Mezzanine Loan — — 16,915 16,901 September 2017 Senior Mortgage 4,394 — 19,416 19,282 October 2017 Mezzanine Loan — 60,000 14,916 14,904 November 2017 Mezzanine Loan (2g) — 85,000 14,944 29,505 December 2017 Mezzanine Loan (2h) — 65,000 14,483 28,563 December 2017 Mortgage/Mezzanine Loan (2i) 795 — 14,968 14,942 December 2017 Jr. Participation — 40,000 19,862 19,846 April 2018 Mezzanine Loan — 175,000 34,752 34,725 April 2018 Jr. Participation/Mezzanine Loan (2j) — 55,000 10,506 20,510 July 2018 Mortgage/Mezzanine Loan (9) 523 20,523 10,806 31,210 August 2018 Mezzanine Loan — 33,000 26,794 26,777 December 2018 Mezzanine Loan 5,267 156,383 53,953 52,774 December 2018 Mezzanine Loan 26,204 217,202 52,336 49,625 December 2018 Mezzanine Loan — 16,383 5,340 — January 2019 Mezzanine Loan — 38,000 21,855 21,845 March 2019 Mezzanine Loan (10) — — — 66,398 Mortgage/Mezzanine Loan (4) — — — 18,395 Jr. Mortgage Participation/ Mezzanine Loan (11) — — — 40,346 Total floating rate $ 100,288 $ 2,561,240 $ 894,434 $ 1,116,455 Total $ 100,288 $ 5,190,867 $ 1,335,835 $ 1,627,844 ____________________________________________________________________ (1) Carrying value is net of discounts, premiums, original issue discounts and deferred origination fees. (2) Carrying value is net of the following amount that was participated out, which is included in other assets and other liabilities on the consolidated balance sheets as a result of the transfer not meeting the conditions for sale accounting: (a) $12.0 million , (b) $41.3 million , (c) $5.0 million , (d) $7.4 million , (e) $36.3 million , (f) $14.5 million , (g) $14.6 million , (h) $14.1 million , (i) $5.1 million and (j) $10.0 million . (3) 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. (4) These loans were repaid in March 2016. (5) These loans were collateralized by defeasance securities. (6) In, April 2016, the maturity date was extended to October 2016. (7) In March 2016, the maturity date was extended to September 2016. (8) In March 2016, the mortgage was sold. (9) In January 2016, the loans were modified. In March 2016, the mortgage was sold. (10) In March 2016, we contributed the loan for a joint venture interest which is now accounted for under the equity method of accounting. It is included in unconsolidated joint ventures on the combined balance sheets. (11) These loans were repaid in February 2016. Preferred Equity Investments As of March 31, 2016 and December 31, 2015 , we held the following preferred equity investments with an aggregate weighted average current yield of 7.79% at March 31, 2016 (in thousands): Type March 31, 2016 Future Funding Obligations March 31, 2016 Senior Financing March 31, 2016 Carrying Value (1) December 31, 2015 (1) Initial Mandatory Redemption Preferred equity $ — $ 71,486 $ 9,971 $ 9,967 March 2018 Preferred equity 5,003 59,966 32,810 32,209 November 2018 $ 5,003 $ 131,452 $ 42,781 $ 42,176 ____________________________________________________________________ (1) Carrying value is net of deferred origination fees. At March 31, 2016 and December 31, 2015 , all debt and preferred equity investments were performing in accordance with the terms of the relevant investments, with the exception of a junior mortgage participation acquired in September 2014, which has a carrying value of zero . We have determined that we have one portfolio segment of financing receivables at March 31, 2016 and 2015 comprising commercial real estate which is primarily recorded in debt and preferred equity investments. Included in other assets is an additional amount of financing receivables totaling $116.1 million and $122.3 million at March 31, 2016 and 2015 , respectively. No financing receivables were 90 days past due at March 31, 2016 .

Investments in Unconsolidated J

Investments in Unconsolidated Joint Ventures	3 Months Ended
	Mar. 31, 2016
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 March 31, 2016 , 650 Fifth Avenue, 33 Beekman, 800 Third Avenue, 21 East 66th Street, and certain properties within Stonehenge Portfolio were VIEs in which we are not the primary beneficiary. Our net equity investment in these VIEs was $181.3 million as of March 31, 2016 . As of December 31, 2015 , 650 Fifth Avenue and 33 Beekman were VIEs in which we were not the primary beneficiary. Our net equity investment in these VIEs was $39.7 million as of December 31, 2015 . Our maximum loss is limited to the amount of our equity investment in these VIEs. All other investments below are voting interest entities. As we do not control the joint ventures listed below, we account for them under the equity method of accounting. The table below provides general information on each of our joint ventures as of March 31, 2016 : Property Partner Ownership Interest Economic Interest Approximate Square Feet Acquisition Date Acquisition Price (1) (in thousands) 100 Park Avenue Prudential Real Estate Investors 49.90% 49.90% 834,000 January 2000 $ 95,800 717 Fifth Avenue Jeff Sutton/Private Investor 10.92% 10.92% 119,500 September 2006 251,900 800 Third Avenue Private Investors 60.52% 60.52% 526,000 December 2006 285,000 1745 Broadway Ivanhoe Cambridge, Inc. 56.88% 56.88% 674,000 April 2007 520,000 Jericho Plaza (2) Onyx Equities/Private Investor 11.67% 11.67% 640,000 April 2007 210,000 11 West 34th Street Private Investor/ Jeff Sutton 30.00% 30.00% 17,150 December 2010 10,800 3 Columbus Circle (3) The Moinian Group 48.90% 48.90% 741,500 January 2011 500,000 280 Park Avenue Vornado Realty Trust 50.00% 50.00% 1,219,158 March 2011 400,000 1552-1560 Broadway (4) Jeff Sutton 50.00% 50.00% 35,897 August 2011 136,550 724 Fifth Avenue Jeff Sutton 50.00% 50.00% 65,040 January 2012 223,000 10 East 53rd Street Canadian Pension Plan Investment Board 55.00% 55.00% 354,300 February 2012 252,500 33 Beekman (5) Harel Insurance and Finance/TNG 33 LLC 45.90% 45.90% 163,500 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 (6) Private Investors 32.28% 32.28% 16,736 December 2012 75,000 650 Fifth Avenue (7) Jeff Sutton 50.00% 50.00% 32,324 November 2013 — 121 Greene Street Jeff Sutton 50.00% 50.00% 7,131 September 2014 27,400 175-225 Third Street Brooklyn, New York KCLW 3rd Street LLC/LIVWRK LLC 95.00% 95.00% — October 2014 74,600 55 West 46th Street Prudential Real Estate Investors 25.00% 25.00% 347,000 November 2014 295,000 Stonehenge Portfolio Various Various Various 2,046,733 Various 36,668 131-137 Spring Street Invesco Real Estate 20.00% 20.00% 68,342 August 2015 277,750 76 11th Avenue (8) Oxford/Vornado 33.33% 36.58% 764,000 March 2016 138,240 ____________________________________________________________________ (1) Acquisition price represents the actual or implied gross purchase price for the joint venture, which is not adjusted for subsequent acquisitions of additional interests. (2) Our ownership percentage was reduced in the first quarter of 2016, from 77.78% to 11.67% , upon completion of the restructuring of the joint venture. (3) As a result of the sale of a condominium interest in September 2012, Young & Rubicam, Inc., or Y&R, owns floors three through eight at the property. Because the joint venture has an option to repurchase these floors, the gain associated with this sale was deferred. (4) The purchase price represents only the purchase of the 1552 Broadway interest which comprised approximately 13,045 square feet. The joint venture also owns a long-term leasehold interest in the retail space and certain other spaces at 1560 Broadway, which is adjacent to 1552 Broadway. (5) The redevelopment project was substantially complete during the second quarter of 2015 and was conveyed to Pace University during the third quarter of 2015. In October 2015, we entered into an agreement to sell the property for $196.0 million . The transaction is expected to be completed in the first half of 2016, subject to customary closing conditions. (6) 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. (7) 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. (8) The joint venture owns two mezzanine notes secured by interests in the entity that owns 76 11th Avenue. The difference between our ownership interest and our economic interest results from our right to 50% of the total exit fee while each of our partners is entitled to receive 25% of the total exit fee. 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 March 31, 2016 and December 31, 2015, the carrying value for acquisition, development and construction arrangements were as follows (in thousands): Loan Type March 31, 2016 December 31, 2015 Initial Maturity Date Mezzanine loan and preferred equity $ 100,000 $ 99,936 March 2017 Mezzanine loan (1) 45,774 45,942 February 2022 $ 145,774 $ 145,878 ____________________________________________________________________ (1) We have an option to convert our loan to an equity interest subject to certain conditions. We have determined that our option to convert the loan to equity is not a derivative financial instrument pursuant to GAAP. Sale of Joint Venture Interest or Property The following table summarizes the investments in unconsolidated joint ventures sold during the three months ended March 31, 2016 : Property Ownership Percentage Disposition Date Type of Sale Gross Asset Valuation (in thousands) (1) Gain on Sale (in thousands) (2) 1 Jericho Plaza (3) 66.11% February 2016 Office $ 95,200 $ 3,300 7 Renaissance Square 50.00% March 2016 Office $ 20,700 $ 4,200 EOP Denver 4.79% March 2016 Office $ 180,700 $ 2,800 ____________________________________________________________ (1) Represents implied gross valuation for the joint venture or sales price of the property. (2) Represents the Company's share of the gain. The gain on sale is net of $0.5 million employee compensation awards accrued in connection with the realization of these investment gains as a bonus to certain employees that were instrumental in realizing the gains on sale. (3) Our ownership percentage was reduced in the first quarter of 2016, from 77.78% to 11.67% , upon completion of the restructuring of the joint venture. 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 March 31, 2016 and December 31, 2015 , respectively, are as follows (amounts in thousands): Property Maturity Date Interest Rate (1) March 31, 2016 December 31, 2015 Fixed Rate Debt: 280 Park Avenue June 2016 6.57 % $ 691,048 $ 692,963 1745 Broadway January 2017 5.68 % 340,000 340,000 521 Fifth Avenue November 2019 3.73 % 170,000 170,000 717 Fifth Avenue (2) July 2022 4.45 % 300,000 300,000 21 East 66th Street April 2023 3.60 % 12,000 12,000 717 Fifth Avenue (2) July 2024 9.00 % 328,704 325,704 3 Columbus Circle March 2025 3.61 % 350,000 350,000 800 Third Avenue February 2026 3.17 % 177,000 20,910 Stonehenge Portfolio (3) Various 4.20 % 421,351 430,627 7 Renaissance Square — 2,927 Total fixed rate debt $ 2,790,103 $ 2,645,131 Property Maturity Date Interest Rate (1) March 31, 2016 December 31, 2015 Floating Rate Debt: 1552 Broadway (4) April 2016 4.58 % 190,410 190,409 Other loan payable June 2016 1.32 % 30,000 30,000 650 Fifth Avenue (5) October 2016 3.92 % 65,000 65,000 175-225 Third Street December 2016 4.50 % 40,000 40,000 10 East 53rd Street February 2017 2.92 % 125,000 125,000 724 Fifth Avenue April 2017 2.84 % 275,000 275,000 33 Beekman (6) August 2017 3.17 % 73,457 73,518 55 West 46th Street (7) October 2017 2.72 % 151,536 150,000 Stonehenge Portfolio December 2017 3.50 % 10,500 10,500 Jericho Plaza (8) March 2018 5.28 % 75,000 163,750 121 Greene Street November 2019 1.92 % 15,000 15,000 11 West 34th Street January 2021 1.88 % 23,000 23,000 100 Park Avenue February 2021 2.18 % 360,000 360,000 131-137 Spring Street August 2020 1.97 % 141,000 141,000 21 East 66th Street June 2033 3.00 % 1,785 1,805 Total floating rate debt $ 1,576,688 $ 1,663,982 Total joint venture mortgages and other loans payable $ 4,366,791 $ 4,309,113 Deferred financing costs, net (47,136 ) (42,565 ) Total joint venture mortgages and other loans payable, net $ 4,319,655 $ 4,266,548 ____________________________________________________________________ (1) Effective weighted average interest rate for the three months ended March 31, 2016 , taking into account interest rate hedges in effect during the period. (2) These loans are comprised of a $300.0 million fixed rate mortgage loan and $290.0 million mezzanine loan. The mezzanine loan is subject to accretion based on the difference between contractual interest rate and contractual pay rate. (3) Amount is comprised of $13.3 million , $55.3 million , $34.9 million , $140.9 million , and $177.0 million in fixed-rate mortgages that mature in July 2016, June 2017, November 2017, August 2019, and June 2024, respectively. In April 2016, the maturity date on $13.3 million due to mature in July 2016, was extended to October 2016. (4) These loans are comprised of a $150.0 million mortgage loan and a $41.5 million mezzanine loan. As of March 31, 2016 , $0.6 million of the mortgage loan and $0.5 million of the mezzanine loan was unfunded. (5) This loan has a committed amount of $97.0 million , of which $32.0 million was unfunded as of March 31, 2016 . (6) 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. This property is currently under contract, and the sale is expected to be completed in the first half of 2016. (7) This loan has a committed amount of $190.0 million , of which $38.5 million was unfunded as of March 31, 2016 . (8) We hold an 11.67% non-controlling interest in the joint venture and the property secures a two year $100.0 million loan, of which $75.0 million is currently outstanding. We act as the operating partner and day-to-day manager for all our joint ventures, except for 800 Third Avenue, Jericho Plaza, 280 Park Avenue, 3 Columbus Circle, 21 East 66th Street, 175-225 Third Street 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 $4.5 million and $2.8 million from these services for the three months ended March 31, 2016 and 2015 , respectively. In addition, we have the ability to earn incentive fees based on the ultimate financial performance of certain of the joint venture properties. The combined balance sheets for the unconsolidated joint ventures, at March 31, 2016 and December 31, 2015 are as follows (in thousands): March 31, 2016 December 31, 2015 Assets Commercial real estate property, net $ 5,998,692 $ 6,122,468 Debt and preferred equity investments, net 284,014 145,878 Other assets 673,317 715,840 Total assets $ 6,956,023 $ 6,984,186 Liabilities and members' equity Mortgages and other loans payable, net $ 4,319,655 $ 4,266,548 Other liabilities 523,359 523,160 Members' equity 2,113,009 2,194,478 Total liabilities and members' equity $ 6,956,023 $ 6,984,186 Company's investments in unconsolidated joint ventures $ 1,146,085 $ 1,203,858 The combined statements of operations for the unconsolidated joint ventures, from acquisition date through the three months ended March 31, 2016 and 2015 , are as follows (in thousands): Three Months Ended March 31, 2016 2015 Total revenues $ 162,512 $ 128,916 Operating expenses 27,254 25,486 Ground rent 3,211 2,592 Real estate taxes 24,210 19,376 Interest expense, net of interest income 49,736 44,007 Amortization of deferred financing costs 3,236 3,010 Transaction related costs — 8 Depreciation and amortization 37,851 32,984 Total expenses 145,498 127,463 Loss on early extinguishment of debt (1,606 ) (833 ) Net income before gain on sale $ 15,408 $ 620 Company's equity in net income from unconsolidated joint ventures $ 10,096 $ 4,030

Deferred Costs

Deferred Costs	3 Months Ended
	Mar. 31, 2016
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Deferred Costs	Deferred Costs Deferred costs at March 31, 2016 and December 31, 2015 consisted of the following (in thousands): March 31, 2016 December 31, 2015 Deferred leasing $ 431,033 $ 415,406 Less: accumulated amortization (184,530 ) (175,486 ) Deferred costs, net $ 246,503 $ 239,920

Mortgages and Other Loans Payab

Mortgages and Other Loans Payable	3 Months Ended
	Mar. 31, 2016
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 March 31, 2016 and December 31, 2015 , respectively, were as follows (amounts in thousands): Property Maturity Date Interest Rate (1) March 31, 2016 December 31, 2015 Fixed Rate Debt: Landmark Square December 2016 4.00 % $ 79,124 $ 79,562 FHLB Facility (2) Various Various 205,000 — 485 Lexington Avenue February 2017 5.61 % 450,000 450,000 762 Madison Avenue February 2017 3.86 % 7,828 7,872 885 Third Avenue (3) 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 % 536,848 542,817 100 Church Street July 2022 4.68 % 224,188 225,099 919 Third Avenue (5) June 2023 5.12 % 500,000 500,000 400 East 57th Street February 2024 4.13 % 67,323 67,644 400 East 58th Street February 2024 4.13 % 28,852 28,990 420 Lexington Avenue October 2024 3.99 % 300,000 300,000 1515 Broadway March 2025 3.93 % 900,000 900,000 11 Madison Avenue September 2025 3.84 % 1,400,000 1,400,000 Series J Preferred Units (6) April 2051 3.75 % 4,000 4,000 500 West Putnam Avenue (7) — 22,376 Total fixed rate debt $ 5,990,813 $ 5,816,010 Floating Rate Debt: Master Repurchase Agreement June 2016 4.00 % 185,898 253,424 FHLB Facility (2) Various Various 45,750 45,750 600 Lexington Avenue October 2017 2.56 % 111,822 112,795 187 Broadway & 5-7 Dey Street October 2017 3.05 % 40,000 40,000 719 Seventh Avenue February 2018 3.49 % 22,892 — 388-390 Greenwich Street (4) June 2018 2.16 % 446,000 446,000 1080 Amsterdam November 2018 4.18 % 3,525 3,525 220 East 42nd Street October 2020 2.02 % 275,000 275,000 248-252 Bedford Avenue (8) — 29,000 Total floating rate debt $ 1,130,887 $ 1,205,494 Total fixed rate and floating rate debt $ 7,121,700 $ 7,021,504 Mortgages reclassed to liabilities related to assets held for sale (4)(8) (1,450,000 ) (29,000 ) Total mortgages and other loans payable $ 5,671,700 $ 6,992,504 Deferred financing costs, net of amortization (86,529 ) $ (110,584 ) Total mortgages and other loans payable, net $ 5,585,171 $ 6,881,920 ____________________________________________________________________ (1) Effective weighted average interest rate for the quarter ended March 31, 2016 , taking into account interest rate hedges in effect during the period. (2) The FHLB Facility is comprised of two fixed rate advances of $105.0 million and $100.0 million that both mature in January 2017 and four variable rate advances of $1.0 million , $15.8 million , $5.0 million and $24.0 million that mature in April 2016, April 2016, June 2016 and December 2016, respectively. The weighted average interest rates on these advances range from 0.69% to 1.03% . The $1.0 million , and $15.8 million advances were repaid in April 2016. (3) In February 2016, we closed on the sale of 885 Third Avenue. The sale did not meet the criteria for sale accounting and as a result the property remains on our consolidated balance sheet until the criteria is met. (4) This property was held for sale at March 31, 2016 and the related mortgage, net of deferred financing costs, net of amortization of $24.5 million , is included in liabilities related to assets held for sale. (5) We own a 51.0% controlling interest in the consolidated 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 , 3.75% Series J Preferred Units of limited partnership interest, or the Series J Preferred Units, with a mandatory liquidation preference of $1,000.00 per unit. The Series J Preferred Units are accounted for as debt because they can be redeemed in cash by the Operating Partnership on the earlier of (i) the date of the sale of the property or (ii) April 30, 2051 or at the option of the unitholders as provided for in the related agreement. (7) In January 2016, the mortgage was repaid. (8) The property at 248-252 Bedford Avenue in Brooklyn, New York was sold in February 2016. All obligations related to the property accruing on and after closing were assumed by the purchaser. At December 31, 2015 this property was held for sale and the related mortgage, net of deferred financing, net of amortization costs of $0.9 million , was included in liabilities related to assets held for sale. Federal Home Loan Bank of New York Facility The Company’s wholly-owned subsidiary, Belmont Insurance Company, or Belmont, a New York licensed captive insurance company, is a member of the Federal Home Loan Bank of New York, or FHLBNY. As a member, Belmont may borrow funds from the FHLBNY in the form of secured advances. As of March 31, 2016 , we had $250.8 million in outstanding secured advances with a weighted average borrowing rate of 0.88% . On January 12, 2016, the Federal Housing Finance Agency, or FHFA, adopted a final regulation on Federal Home Loan Bank, or FHLB, membership. The rule excludes captive insurance entities from FHLB membership on a going-forward basis and provides termination rules for current captive insurance members. Unless the final rule is modified, Belmont's membership will terminate on February 19, 2017, at which point we would be required to repay all funds borrowed from the FHLBNY. Master Repurchase Agreement The Master Repurchase Agreement, as amended in December 2013, or MRA, provides us with the ability to sell certain debt investments with a simultaneous agreement to repurchase the same at a certain date or on demand. This MRA has a maximum facility capacity of $300.0 million and bears interest ranging from 250 and 325 basis points over 30-day LIBOR depending on the pledged collateral. In September 2015, we entered into an amendment to the MRA to extend the maturity to June 29, 2016. Further, since December 6, 2015 we have been required to pay monthly in arrears a 25 basis point fee on the excess of $150.0 million over the average daily balance during the period if the average daily balance is less than $150.0 million . We seek to mitigate risks associated with our repurchase agreement by managing the credit quality of our assets, early repayments, interest rate volatility, liquidity, and market value. The margin call provisions under our repurchase facility permit valuation adjustments based on capital markets activity, and are not limited to collateral-specific credit marks. To monitor credit risk associated with our debt investments, our asset management team regularly reviews our investment portfolio and is in contact with our borrowers in order to monitor the collateral and enforce our rights as necessary. The risk associated with potential margin calls is further mitigated by our ability to recollateralize the facility with additional assets from our portfolio of debt investments, our ability to satisfy margin calls with cash or cash equivalents and access to additional liquidity through the 2012 credit facility, as defined below. At March 31, 2016 and December 31, 2015 , the gross book value of the properties and debt and preferred equity investments collateralizing the mortgages and other loans payable, not including assets held for sale, was approximately $8.9 billion and $10.8 billion , respectively.

Corporate Indebtedness

Corporate Indebtedness	3 Months Ended
	Mar. 31, 2016
Debt Disclosure [Abstract]
Corporate Indebtedness	Corporate Indebtedness 2012 Credit Facility In July 2015, we entered into the third amendment to the credit facility that was originally entered into by the Company in November 2012, referred to as the 2012 credit facility, which increased our unsecured corporate facility by $500.0 million . The revolving credit facility was increased by $400.0 million to $1.6 billion and the term loan portion of the facility was increased by $100.0 million to $933.0 million . In January 2015, we amended the 2012 credit facility by entering into a second amended and restated credit agreement, which decreased the interest-rate margin and facility fee applicable to the revolving credit facility by 20 basis points and five basis points, respectively, and extended the maturity date of the revolving credit facility to March 29, 2019 with an as-of-right extension through March 29, 2020. In November 2014, we increased the term loan portion of the facility by $50.0 million to $833.0 million . In March 2014, we entered into an amendment to the 2012 credit facility, which among other things, increased the term loan portion of the facility by $383.0 million to $783.0 million , decreased the interest-rate margin applicable to the term loan portion of the facility by 25 basis points and extended the maturity of the term loan portion of the facility from March 30, 2018 to June 30, 2019. As of March 31, 2016 , the 2012 credit facility, as amended, consisted of a $1.6 billion revolving credit facility and a $933.0 million term loan. We also have an option, subject to customary conditions, to increase the capacity under the revolving credit facility to $3.0 billion at any time prior to the maturity date for the revolving credit facility without the consent of existing lenders, by obtaining additional commitments from our existing lenders and other financial institutions. As of March 31, 2016 , the 2012 credit facility bore interest at a spread over LIBOR ranging from (i) 87.5 basis points to 155 basis points for loans under the revolving credit facility and (ii) 95 basis points to 190 basis points for loans under the term loan facility, in each case based on the credit rating assigned to the senior unsecured long term indebtedness of ROP. At March 31, 2016 , the applicable spread was 125 basis points for the revolving credit facility and 140 basis points for the term loan facility. At March 31, 2016 , the effective interest rate was 1.68% for the revolving credit facility and 1.89% 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 March 31, 2016 , the facility fee was 25 basis points. As of March 31, 2016 , we had $74.3 million of outstanding letters of credit, $775.0 million drawn under the revolving credit facility and $933.0 million outstanding under the term loan facility, with total undrawn capacity of $750.7 million under the 2012 credit facility. At March 31, 2016 and December 31, 2015 the revolving credit facility had a carrying value of $766.7 million and $985.1 million , respectively, inclusive of net deferred financing costs. At March 31, 2016 and December 31, 2015, the term loan facility had a carrying value of $929.8 million and $929.5 million , respectively, inclusive of net deferred financing costs. The Company, the Operating Partnership and ROP are all borrowers jointly and severally obligated under the 2012 credit facility. None of our other subsidiaries are obligors under the 2012 credit facility. The 2012 credit facility includes certain restrictions and covenants (see Restrictive Covenants below). Senior Unsecured Notes The following table sets forth our senior unsecured notes and other related disclosures as of March 31, 2016 and December 31, 2015 , respectively, by scheduled maturity date (dollars in thousands): Issuance March 31, 2016 Unpaid Principal Balance March 31, 2016 Accreted Balance December 31, 2015 Accreted Balance Coupon Rate (1) Effective Rate Term (in Years) Maturity Date October 12, 2010 (2) $ 345,000 $ 324,281 $ 321,130 3.00 % 6.65 % 7 October 15, 2017 August 5, 2011 (3) 250,000 249,827 249,810 5.00 % 5.03 % 7 August 15, 2018 March 16, 2010 (3) 250,000 250,000 250,000 7.75 % 7.75 % 10 March 15, 2020 November 15, 2012 (3) 200,000 200,000 200,000 4.50 % 4.50 % 10 December 1, 2022 December 17, 2015 (3) 100,000 100,000 100,000 4.27 % 4.27 % 10 December 17, 2025 March 26, 2007 (4) 10,008 10,008 10,008 3.00 % 3.00 % 20 March 30, 2027 March 31, 2006 (5) — — 255,296 $ 1,155,008 $ 1,134,116 $ 1,386,244 Deferred financing costs, net $ (7,257 ) $ (7,280 ) $ 1,155,008 $ 1,126,859 $ 1,378,964 ____________________________________________________________________ (1) Interest on the senior unsecured notes is payable semi-annually with principal and unpaid interest due on the scheduled maturity dates. (2) Issued by the Operating Partnership. Interest on these exchangeable notes is payable semi-annually on April 15 and October 15. The notes had an initial exchange rate representing an exchange price that was set at a 30.0% premium to the last reported sale price of SL Green's common stock on October 6, 2010, or $85.81 . The initial exchange rate is subject to adjustment under certain circumstances. The current exchange rate is 12.4230 shares of SL Green's common stock per $1,000 principal amount of these notes. The notes are senior unsecured obligations of the Operating Partnership and are exchangeable upon the occurrence of specified events and during the period beginning on the twenty-second scheduled trading day prior to the maturity date and ending on the second business day prior to the maturity date, into cash or a combination of cash and shares of SL Green's common stock, if any, at our option. As a result of meeting specified events (as defined in the Indenture Agreement), these notes became exchangeable commencing January 1, 2016 and remained exchangeable through March 31, 2016. The notes are guaranteed by ROP. On the issuance date, $78.3 million of the debt balance was recorded in equity. As of March 31, 2016 , $20.7 million remained to be amortized into the debt balance. (3) Issued by the Company, the Operating Partnership and ROP, as co-obligors. (4) Issued by the Operating Partnership. Interest on these remaining exchangeable notes is payable semi-annually on March 30 and September 30. The notes have an initial exchange rate representing an exchange price that was set at a 25.0% premium to the last reported sale price of the Company's common stock on March 20, 2007, or $173.30 . The initial exchange rate is subject to adjustment under certain circumstances. The current exchange rate is 5.7974 shares of SL Green's common stock per $1,000 principal amount of these notes. The notes are senior unsecured obligations of the Operating Partnership and are exchangeable upon the occurrence of specified events and during the period beginning on the twenty-second scheduled trading day prior to the maturity date and ending on the second business day prior to the maturity date, into cash or a combination of cash and shares of SL Green's common stock, if any, at our option. The notes are currently redeemable at the Operating Partnership’s option. The Operating Partnership may be required to repurchase the notes on March 30, 2017 and 2022, and upon the occurrence of certain designated events. (5) Issued by ROP, balance was repaid in March 2016. Restrictive Covenants The terms of the 2012 credit facility, as amended, and certain of our senior unsecured notes include certain restrictions and covenants which may limit, among other things, our ability to pay dividends, make certain types of investments, incur additional indebtedness, incur liens and enter into negative pledge agreements and dispose of assets, and which require compliance with financial ratios relating to the maximum ratio of total indebtedness to total asset value, a minimum ratio of EBITDA to fixed charges, a maximum ratio of secured indebtedness to total asset value and a maximum ratio of unsecured indebtedness to unencumbered asset value. The dividend restriction referred to above provides that, we will not during any time when a default is continuing, make distributions with respect to common stock or other equity interests, except to enable the Company to continue to qualify as a REIT for Federal income tax purposes. As of March 31, 2016 and 2015 , we were in compliance with all such covenants. Junior Subordinated Deferrable Interest Debentures In June 2005, the Company and the Operating Partnership issued $100.0 million in unsecured trust preferred securities through a newly formed trust, SL Green Capital Trust I, or the Trust, which is a wholly-owned subsidiary of the Operating Partnership. The securities mature in 2035 and bear interest at 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 March 31, 2016 , including as-of-right extension options and put options, were as follows (in thousands): Scheduled Amortization Principal Revolving Credit Facility Unsecured Term Loan Trust Preferred Securities Senior Unsecured Notes Total Joint Venture Debt Remaining 2016 $ 42,226 $ 309,584 $ — $ — $ — $ — $ 351,810 $ 526,982 2017 63,643 1,076,548 — — — 355,008 1,495,199 591,284 2018 64,119 42,417 — — — 250,000 356,536 447 2019 70,255 — — 933,000 — — 1,003,255 104,687 2020 52,799 679,531 775,000 — — 250,000 1,757,330 30,298 Thereafter 147,604 4,572,974 — — 100,000 300,000 5,120,578 451,544 $ 440,646 $ 6,681,054 $ 775,000 $ 933,000 $ 100,000 $ 1,155,008 $ 10,084,708 $ 1,705,242 Consolidated interest expense, excluding capitalized interest, was comprised of the following (in thousands): Three Months Ended March 31, 2016 2015 Interest expense $ 102,155 $ 85,017 Interest capitalized (6,618 ) (8,558 ) Interest income (865 ) (652 ) Interest expense, net $ 94,672 $ 75,807

Related Party Transactions

Related Party Transactions	3 Months Ended
	Mar. 31, 2016
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 $0.9 million and $1.0 million , for the three months ended March 31, 2016 and 2015 , respectively. We also recorded expenses, inclusive of capitalized expenses, of $3.8 million and $4.0 million , for the three months ended March 31, 2016 and 2015 , respectively, for these services (excluding services provided directly to tenants). Management Fees S.L. Green Management Corp., a consolidated entity, receives property management fees from an entity in which Stephen L. Green owns an interest. We received management fees from this entity of $0.1 million for both the three months ended March 31, 2016 and 2015 . Other Amounts due from related parties at March 31, 2016 and December 31, 2015 consisted of the following (in thousands): March 31, 2016 December 31, 2015 Due from joint ventures $ 2,005 $ 1,334 Other 13,143 9,316 Related party receivables $ 15,148 $ 10,650

Noncontrolling Interests on the

Noncontrolling Interests on the Company's Consolidated Financial Statements	3 Months Ended
	Mar. 31, 2016
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 March 31, 2016 and December 31, 2015 , the noncontrolling interest unit holders owned 3.84% , or 4,000,632 units, and 3.61% , or 3,745,766 units, of the Operating Partnership, respectively. At March 31, 2016 , 4,000,632 shares of SL Green's common stock were reserved for issuance upon the redemption of units of limited partnership interest of the Operating Partnership. Noncontrolling interests in the Operating Partnership is recorded at the greater of its cost basis or fair market value based on the closing stock price of SL Green's common stock at the end of the reporting period. Below is the rollforward analysis of the activity relating to the noncontrolling interests in the Operating Partnership as of March 31, 2016 and December 31, 2015 (in thousands): March 31, 2016 December 31, 2015 Balance at beginning of period $ 424,206 $ 469,524 Distributions (2,881 ) (9,710 ) Issuance of common units 18,140 30,506 Redemption of common units (7,152 ) (55,697 ) Net income 922 10,565 Accumulated other comprehensive income allocation (322 ) (67 ) Fair value adjustment (25,867 ) (20,915 ) Balance at end of period $ 407,046 $ 424,206 Preferred Units of Limited Partnership Interest in the Operating Partnership The Operating Partnership has 1,902,000 4.50% Series G Preferred Units of limited partnership interest, or the Series G Preferred Units outstanding, with a liquidation preference of $25.00 per unit, which were issued in January 2012 in conjunction with an acquisition. The Series G Preferred unitholders receive annual dividends of $1.125 per unit paid on a quarterly basis and dividends are cumulative, subject to certain provisions. The Series G Preferred Units are convertible into a number of common units of limited partnership interest in the Operating Partnership equal to (i) the liquidation preference plus accumulated and unpaid distributions on the conversion date divided by (ii) $88.50 . The common units of limited partnership interest in the Operating Partnership may be redeemed in exchange for SL Green's common stock on a 1 -to-1 basis. The Series G Preferred Units also provide the holder with the right to require the Operating Partnership to repurchase the Series G Preferred Units for cash before January 31, 2022. The Operating Partnership has 60 Series F Preferred Units outstanding with a mandatory liquidation preference of $1,000.00 per unit. The Operating Partnership has authorized up to 700,000 3.50% Series K Preferred Units of limited partnership interest, or the Series K Preferred Units, with a liquidation preference of $25.00 per unit. In August 2014, the Company issued 563,954 Series K Preferred Units in conjunction with an acquisition. The Series K Preferred unitholders receive annual dividends of $0.875 per unit paid on a quarterly basis and dividends are cumulative, subject to certain provisions. The Series K Preferred Units can be redeemed at any time, at the option of the unitholder, either for cash or are convertible into a number of common units of limited partnership interest in the Operating Partnership equal to (i) the liquidation preference plus accumulated and unpaid distributions on the conversion date divided by (ii) $134.67 . The Operating Partnership has authorized up to 500,000 4.00% Series L Preferred Units of limited partnership interest, or the Series L Preferred Units, with a liquidation preference of $25.00 per unit. In August 2014, the Company issued 378,634 Series L Preferred Units in conjunction with an acquisition. The Series L Preferred unitholders receive annual dividends of $1.00 per unit paid on a quarterly basis and dividends are cumulative, subject to certain provisions. The Series L Preferred Units can be redeemed at any time at par for cash at the option of the unitholder. The Operating Partnership has authorized up to 1,600,000 3.75% Series M Preferred Units of limited partnership interest, or the Series M Preferred Units, with a liquidation preference of $25.00 per unit. In February 2015, the Company issued 1,600,000 Series M Preferred Units in conjunction with the acquisition of ownership interests in and relating to certain residential and retail real estate properties. The Series M Preferred unitholders receive annual dividends of $0.9375 per unit paid on a quarterly basis and dividends are cumulative, subject to certain provisions. The Series M Preferred Units can be redeemed at any time at par for cash at the option of the unitholder. The Operating Partnership has authorized up to 552,303 3.00% Series N Preferred Units of limited partnership interest, or the Series N Preferred Units, with a liquidation preference of $25.00 per unit. In June 2015, the Company issued 552,303 Series N Preferred Units in conjunction with an acquisition. The Series N Preferred unitholders receive annual dividends of $0.75 per unit paid on a quarterly basis and dividends are cumulative, subject to certain provisions. The Series N Preferred Units can be redeemed at any time at par for cash at the option of the unitholder. The Operating Partnership has authorized an aggregate of one 6.25% Series O Preferred Unit of limited partnership interest, or the Series O Preferred Unit. In June 2015, the Company issued the Series O Preferred Unit in connection with an acquisition. The Operating Partnership has authorized up to 200,000 4.00% Series P Preferred Units of limited partnership interest, or the Series P Preferred Units, with a liquidation preference of $25.00 per unit. In July 2015, the Company issued 200,000 Series P Preferred Units in conjunction with an acquisition. The Series P Preferred unitholders receive annual dividends of $1.00 per unit paid on a quarterly basis and dividends are cumulative, subject to certain provisions. The Series P Preferred Units can be redeemed at any time at par for cash at the option of the unitholder. The Operating Partnership has authorized up to 268,000 3.50% Series Q Preferred Units of limited partnership interest, or the Series Q Preferred Units, with a liquidation preference of $25.00 per unit. In July 2015, the Company issued 268,000 Series Q Preferred Units in conjunction with an acquisition. The Series Q Preferred unitholders receive annual dividends of $0.875 per unit paid on a quarterly basis and dividends are cumulative, subject to certain provisions. The Series Q Preferred Units can be redeemed at any time, at the option of the unitholder, either for cash or are convertible into a number of common units of limited partnership interest in the Operating Partnership equal to (i) the liquidation preference plus accumulated and unpaid distributions on the conversion date divided by (ii) $148.95 . The Operating Partnership has authorized up to 400,000 3.50% Series R Preferred Units of limited partnership interest, or the Series R Preferred Units, with a liquidation preference of $25.00 per unit. In August 2015, the Company issued 400,000 Series R Preferred Units in conjunction with an acquisition. The Series R Preferred unitholders receive annual dividends of $0.875 per unit paid on a quarterly basis and dividends are cumulative, subject to certain provisions. The Series R Preferred Units can be redeemed at any time, at the option of the unitholder, either for cash or are convertible into a number of common units of limited partnership interest in the Operating Partnership equal to (i) the liquidation preference plus accumulated and unpaid distributions on the conversion date divided by (ii) $154.89 . The Operating Partnership has authorized up to 1,077,280 4.00% Series S Preferred Units of limited partnership interest, or the Series S Preferred Units, with a liquidation preference of $25.00 per unit. In August 2015, the Company issued 1,077,280 Series S Preferred Units in conjunction with an acquisition. The Series S Preferred unitholders receive annual dividends of $1.00 per unit paid on a quarterly basis and dividends are cumulative, subject to certain provisions. The Series S Preferred Units can be redeemed at any time at par for cash at the option of the unitholder. The Operating Partnership has authorized up to 230,000 2.75% Series T Preferred Units of limited partnership interest, or the Series T Preferred Units, with a liquidation preference of $25.00 per unit. In March 2016, the Company issued 230,000 Series T Preferred Units in conjunction with an acquisition. The Series T Preferred unitholders receive annual dividends of $0.6875 per unit paid on a quarterly basis and dividends are cumulative, subject to certain provisions. The Series T Preferred Units can be redeemed at any time, at the option of the unitholder, either for cash or are convertible into a number of common units of limited partnership interest in the Operating Partnership equal to (i) the liquidation preference plus accumulated and unpaid distributions on the conversion date divided by (ii) $119.02 . The Operating Partnership has authorized up to 680,000 4.50% Series U Preferred Units of limited partnership interest, or the Series U Preferred Units, with a liquidation preference of $25.00 per unit. In March 2016, the Company issued 680,000 Series U Preferred Units in conjunction with an acquisition. The Series U Preferred unitholders initially receive annual dividends of $1.125 per unit paid on a quarterly basis and dividends are cumulative, subject to certain provisions. The annual dividend is subject to reduction upon the occurence of certain circumstances set forth in the terms of the Series U Preferred Units. The minimum annual dividend is $0.75 per unit. The Series U Preferred Units can be redeemed at any time at par for cash at the option of the unitholder. T hrough a consolidated subsidiary, we have authorized up to 109,161 3.5% Series A Preferred Units of limited partnership interest, or the Greene Series A Preferred Units, with a liquidation preference of $1,000.00 per unit. In August 2015, the Company issued 109,161 Greene Series A Preferred Units in conjunction with an acquisition. The Greene Series A Preferred unitholders receive annual dividends of $35.00 per unit paid on a quarterly basis and dividends are cumulative, subject to certain provisions. The Greene Series A Preferred Units can be redeemed at any time, at the option of the unitholder, either for cash or are convertible on a one-for-one basis, into the Series B Preferred Units of limited partnership interest, or the Greene Series B Preferred Units. The Greene Series B Preferred Units can be converted at any time, at the option of the unitholder, into a number of common stock equal to 6.71348 shares of common stock for each Greene Series B Preferred Unit. As of March 31, 2016 , no Greene Series B Preferred Units have been issued. Below is the rollforward analysis of the activity relating to the preferred units in the Operating Partnership as of March 31, 2016 and December 31, 2015 (in thousands): March 31, 2016 December 31, 2015 Balance at beginning of period $ 282,516 $ 71,115 Issuance of preferred units 22,793 211,601 Redemption of preferred units (440 ) (200 ) Balance at end of period $ 304,869 $ 282,516

Stockholders' Equity of the Com

Stockholders' Equity of the Company	3 Months Ended
	Mar. 31, 2016
Stockholders' Equity Note [Abstract]
Stockholders' Equity of the Company	Stockholders’ Equity of the Company Common Stock Our authorized capital stock consists of 260,000,000 shares, $0.01 par value per share, consisting of 160,000,000 shares of common stock, $0.01 par value per share, 75,000,000 shares of excess stock, at $0.01 par value per share, and 25,000,000 shares of preferred stock, par value $0.01 per share. As of March 31, 2016 , 100,081,448 shares of common stock and no shares of excess stock were issued and outstanding. At-The-Market Equity Offering Program In July 2011, the Company, along with the Operating Partnership, entered into an "at-the-market" equity offering program, or ATM Program, to sell an aggregate up to $250.0 million of SL Green's common stock. During the year ended December 31, 2014, we sold 25,659 shares of our common stock out of the remaining balance of the ATM Program for aggregate net proceeds of $2.8 million . The net proceeds from these offerings were contributed to the Operating Partnership in exchange for 25,659 units of limited partnership interest of the Operating Partnership. 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 up to $300.0 million of SL Green's common stock. During the year ended December 31, 2014, we sold 1,626,999 shares of our common stock for aggregate net proceeds of $182.9 million . The net proceeds from these offerings were contributed to the Operating Partnership in exchange for 1,626,999 units of limited partnership interest of the Operating Partnership. 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 year ended December 31, 2015, we sold 91,180 shares of our common stock for aggregate net proceeds of $12.0 million . The net proceeds from these offerings were contributed to the Operating Partnership in exchange for 91,180 units of limited partnership interest of the Operating Partnership. Perpetual Preferred Stock We have 9,200,000 shares of our 6.50% Series I Cumulative Redeemable Preferred Stock, or the Series I Preferred Stock, outstanding with a mandatory liquidation preference of $25.00 per share. The Series I Preferred stockholders receive annual dividends of $1.625 per share paid on a quarterly basis and dividends are cumulative, subject to certain provisions. We are entitled to redeem the Series I Preferred Stock at par for cash at our option on or after August 10, 2017. In August 2012, we received $221.9 million in net proceeds from the issuance of the Series I Preferred Stock, which were recorded net of underwriters' discount and issuance costs, and contributed the net proceeds to the Operating Partnership in exchange for 9,200,000 units of 6.50% Series I Cumulative Redeemable Preferred Units of limited partnership interest, or the Series I Preferred Units. Dividend Reinvestment and Stock Purchase Plan In February 2015, the Company filed a registration statement with the SEC for our dividend reinvestment and stock purchase plan, or DRSPP, which automatically became effective upon filing. The Company registered 3,500,000 shares of SL Green's common stock under the DRSPP. The DRSPP commenced on September 24, 2001. Earnings per Share SL Green's earnings per share for the three months ended March 31, 2016 and 2015 are computed as follows (in thousands): Three Months Ended March 31, Numerator 2016 2015 Basic Earnings: Income attributable to SL Green common stockholders $ 23,221 $ 43,277 Effect of Dilutive Securities: Redemption of units to common shares 922 1,743 Diluted Earnings: Income attributable to SL Green common stockholders $ 24,143 $ 45,020 Three Months Ended March 31, Denominator 2016 2015 Basic Shares: Weighted average common stock outstanding 100,051 98,402 Effect of Dilutive Securities: Operating Partnership units redeemable for common shares 3,974 3,964 Stock-based compensation plans 234 653 Diluted weighted average common stock outstanding 104,259 103,019 SL Green has excluded 1,349,019 and 203,975 common stock equivalents from the diluted shares outstanding for the three months ended March 31, 2016 and 2015, respectively, as they were anti-dilutive.

Partners' Capital of the Operat

Partners' Capital of the Operating Partnership	3 Months Ended
	Mar. 31, 2016
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 March 31, 2016 , 100,081,448 shares of common stock and no shares of excess stock were issued and outstanding. At-The-Market Equity Offering Program In July 2011, the Company, along with the Operating Partnership, entered into an "at-the-market" equity offering program, or ATM Program, to sell an aggregate up to $250.0 million of SL Green's common stock. During the year ended December 31, 2014, we sold 25,659 shares of our common stock out of the remaining balance of the ATM Program for aggregate net proceeds of $2.8 million . The net proceeds from these offerings were contributed to the Operating Partnership in exchange for 25,659 units of limited partnership interest of the Operating Partnership. 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 up to $300.0 million of SL Green's common stock. During the year ended December 31, 2014, we sold 1,626,999 shares of our common stock for aggregate net proceeds of $182.9 million . The net proceeds from these offerings were contributed to the Operating Partnership in exchange for 1,626,999 units of limited partnership interest of the Operating Partnership. 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 year ended December 31, 2015, we sold 91,180 shares of our common stock for aggregate net proceeds of $12.0 million . The net proceeds from these offerings were contributed to the Operating Partnership in exchange for 91,180 units of limited partnership interest of the Operating Partnership. Perpetual Preferred Stock We have 9,200,000 shares of our 6.50% Series I Cumulative Redeemable Preferred Stock, or the Series I Preferred Stock, outstanding with a mandatory liquidation preference of $25.00 per share. The Series I Preferred stockholders receive annual dividends of $1.625 per share paid on a quarterly basis and dividends are cumulative, subject to certain provisions. We are entitled to redeem the Series I Preferred Stock at par for cash at our option on or after August 10, 2017. In August 2012, we received $221.9 million in net proceeds from the issuance of the Series I Preferred Stock, which were recorded net of underwriters' discount and issuance costs, and contributed the net proceeds to the Operating Partnership in exchange for 9,200,000 units of 6.50% Series I Cumulative Redeemable Preferred Units of limited partnership interest, or the Series I Preferred Units. Dividend Reinvestment and Stock Purchase Plan In February 2015, the Company filed a registration statement with the SEC for our dividend reinvestment and stock purchase plan, or DRSPP, which automatically became effective upon filing. The Company registered 3,500,000 shares of SL Green's common stock under the DRSPP. The DRSPP commenced on September 24, 2001. Earnings per Share SL Green's earnings per share for the three months ended March 31, 2016 and 2015 are computed as follows (in thousands): Three Months Ended March 31, Numerator 2016 2015 Basic Earnings: Income attributable to SL Green common stockholders $ 23,221 $ 43,277 Effect of Dilutive Securities: Redemption of units to common shares 922 1,743 Diluted Earnings: Income attributable to SL Green common stockholders $ 24,143 $ 45,020 Three Months Ended March 31, Denominator 2016 2015 Basic Shares: Weighted average common stock outstanding 100,051 98,402 Effect of Dilutive Securities: Operating Partnership units redeemable for common shares 3,974 3,964 Stock-based compensation plans 234 653 Diluted weighted average common stock outstanding 104,259 103,019 SL Green has excluded 1,349,019 and 203,975 common stock equivalents from the diluted shares outstanding for the three months ended March 31, 2016 and 2015, respectively, as they were anti-dilutive.
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 March 31, 2016 owned 100,081,448 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 March 31, 2016 , limited partners other than SL Green owned 3.84% , or 4,000,632 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 months ended March 31, 2016 and 2015 , respectively are computed as follows (in thousands): Three months ended March 31, Numerator 2016 2015 Basic and Diluted Earnings: Income attributable to SLGOP common unitholders $ 24,143 $ 45,020 Three months ended March 31, Denominator 2016 2015 Basic units: Weighted average common units outstanding 104,025 102,366 Effect of Dilutive Securities: Stock-based compensation plans 234 653 Diluted weighted average common units outstanding 104,259 103,019 The Operating Partnership has excluded 1,349,019 and 203,975 common unit equivalents from the diluted units outstanding for the three months ended March 31, 2016 and 2015 , respectively, as they were anti-dilutive.

Share-based Compensation

Share-based Compensation	3 Months Ended
	Mar. 31, 2016
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 March 31, 2016 , 0.5 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 three months ended March 31, 2016 and the year ended December 31, 2015 . March 31, 2016 December 31, 2015 Dividend yield 2.30 % 1.97 % Expected life of option 3.5 years 3.6 years Risk-free interest rate 1.27 % 1.43 % Expected stock price volatility 31.00 % 32.34 % A summary of the status of the Company's stock options as of March 31, 2016 and December 31, 2015 , and changes during the three months ended March 31, 2016 and year ended December 31, 2015 are as follows: March 31, 2016 December 31, 2015 Options Outstanding Weighted Average Exercise Price Options Outstanding Weighted Average Exercise Price Balance at beginning of period $ 1,595,007 $ 95.52 $ 1,462,726 $ 87.98 Granted 4,500 94.75 389,836 112.54 Exercised (17,250 ) 72.41 (217,438 ) 74.69 Lapsed or cancelled (15,800 ) 113.59 (40,117 ) 98.61 Balance at end of period $ 1,566,457 $ 95.59 $ 1,595,007 $ 95.52 Options exercisable at end of period 921,240 $ 88.23 589,055 $ 89.85 Weighted average fair value of options granted during the period $ 84,531 $ 9,522,613 All options were granted with strike prices ranging from $20.67 to $137.18 . The remaining weighted average contractual life of the options outstanding was 3.5 years and the remaining average contractual life of the options exercisable was 3.1 years. During the three months ended March 31, 2016 and 2015 , respectively, we recognized $2.0 million and $2.0 million of compensation expense, respectively, for these options. As of March 31, 2016 , there was $12.6 million of total unrecognized compensation cost related to unvested stock options, which is expected to be recognized over a weighted average period of 3.0 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 March 31, 2016 and December 31, 2015 and charges during the three months ended March 31, 2016 and the year ended December 31, 2015 , are as follows: March 31, 2016 December 31, 2015 Balance at beginning of period 3,137,881 3,000,979 Granted 1,000 143,053 Cancelled (4,600 ) (6,151 ) Balance at end of period 3,134,281 3,137,881 Vested during the period 81,172 87,081 Compensation expense recorded $ 2,016,554 $ 7,540,747 Weighted average fair value of restricted stock granted during the period $ 93,840 $ 16,061,201 The fair value of restricted stock that vested during the three months ended March 31, 2016 and the year ended December 31, 2015 was $7.3 million and $7.4 million , respectively. As of March 31, 2016 there was $18.6 million of total unrecognized compensation cost related to restricted stock, which is expected to be recognized over a weighted average period of 2.5 years . For the three months ended March 31, 2016 and 2015, $1.5 million , and $1.6 million , respectively, was capitalized to assets associated with compensation expense related to our long-term compensation plans, restricted stock and stock options. We have granted LTIP Units, which include bonus, time-based and performance based awards, with a fair val ue of $27.4 million and $25.4 million as of March 31, 2016 and December 31, 2015, respectively. The grant date fair value of the LTIP Unit awards was calculated in accordance with ASC 718. A third party consultant determined the fair value of the LTIP Units to have a discount from SL Green's common stock price. The discount was calculated by considering the inherent uncertainty that the LTIP Units will reach parity with other common partnership units and the illiquidity due to transfer restrictions. As of March 31, 2016 , there was $11.2 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 1.4 years . During the three months ended March 31, 2016 and 2015, we recorded compensation expense related to bonus, time-based and performance based awards of $9.5 million and $ 13.2 million, respectively. 2010 Notional Unit Long-Term Compensation Plan In December 2009, the compensation committee of the Company's board of directors approved the general terms of the SL Green Realty Corp. 2010 Notional Unit Long-Term Compensation Program, or the 2010 Long-Term Compensation Plan. The 2010 Long-Term Compensation Plan is a long-term incentive compensation plan pursuant to which award recipients could earn, in the aggregate, from $15.0 million up to $75.0 million of LTIP Units in the Operating Partnership based on the Company's stock price appreciation over three years beginning on December 1, 2009; provided that, if maximum performance had been achieved, $25.0 million of awards could be earned at any time after the beginning of the second year and an additional $25.0 million of awards could be earned at any time after the beginning of the third year. In order to achieve maximum performance under the 2010 Long-Term Compensation Plan, the Company's aggregate stock price appreciation during the performance period had to equal or exceed 50% . The compensation committee determined that maximum performance had been achieved at or shortly after the beginning of each of the second and third years of the performance period and for the full performance period and, accordingly, 385,583 LTIP Units, 327,416 LTIP Units and 327,416 LTIP Units were earned under the 2010 Long-Term Compensation Plan in December 2010, 2011 and 2012, respectively. Substantially in accordance with the original terms of the program, 50% of these LTIP Units vested on December 17, 2012 (accelerated from the original January 1, 2013 vesting date), 25% of these LTIP Units vested on December 11, 2013 (accelerated from the original January 1, 2014 vesting date) and the remainder vested on January 1, 2015 based on continued employment. In accordance with the terms of the 2010 Long-Term Compensation Plan, distributions were not paid on any LTIP Units until they were earned, at which time we paid all distributions that would have been paid on the earned LTIP Units since the beginning of the performance period. The cost of the 2010 Long-Term Compensation Plan ( $31.7 million , subject to forfeitures) was amortized into earnings through the final vesting period of January 1, 2015. 2011 Outperformance Plan In August 2011, the compensation committee of the Company's board of directors approved the general terms of the SL Green Realty Corp. 2011 Outperformance Plan, or the 2011 Outperformance Plan. Participants in the 2011 Outperformance Plan could earn, in the aggregate, up to $85.0 million of LTIP Units in the Operating Partnership based on our total return to stockholders for the three-year period beginning September 1, 2011. Under the 2011 Outperformance Plan, participants were entitled to share in a "performance pool" comprised of LTIP Units with a value equal to 10% of the amount by which our total return to stockholders during the three -year period exceeded a cumulative total return to stockholders of 25% , subject to the maximum of $85.0 million of LTIP Units; provided that if maximum performance was achieved, one-third of each award could be earned at any time after the beginning of the second year and an additional one-third of each award could be earned at any time after the beginning of the third year. LTIP Units earned under the 2011 Outperformance Plan 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 ( $26.7 million , subject to forfeitures) was amortized into earnings through the final vesting period. We recorded no compensation expense during the three months ended March 31, 2016, and $0.7 million during the three months ended March 31, 2015 related to the 2011 Outperformance Plan. 2014 Outperformance Plan In August 2014, the compensation committee of the Company's board of directors approved the general terms of the SL Green Realty Corp. 2014 Outperformance Plan, or the 2014 Outperformance Plan. Participants in the 2014 Outperformance Plan may earn, in the aggregate, up to 610,000 LTIP Units in our Operating Partnership based on our total return to stockholders for the three -year period beginning September 1, 2014. For each individual award, two-thirds of the LTIP Units may be earned based on the Company’s absolute total return to stockholders and one-third of the LTIP Units may be earned based on relative total return to stockholders compared to the constituents of the MSCI REIT Index. Awards earned based on absolute total return to stockholders will be determined independently of awards earned based on relative total return to stockholders. In the event the Company’s performance reaches either threshold before the end of the three -year performance period, a pro-rata portion of the maximum award may be earned. For each component, if the Company’s performance reaches the maximum threshold beginning with the 19th month of the performance period, participants will earn one-third of the maximum award that may be earned for that component. If the Company’s performance reaches the maximum threshold during the third year of the performance period for a component, participants will earn two-thirds (or an additional one-third) of the maximum award that may be earned for that component. LTIP Units earned under the 2014 Outperformance Plan will be subject to continued vesting requirements, with 50% of any awards earned vesting on August 31, 2017 and the remaining 50% vesting on August 31, 2018, subject to continued employment with us through such dates. Participants will not be entitled to distributions with respect to LTIP Units granted under the 2014 Outperformance Plan unless and until they are earned. If LTIP Units are earned, each participant will also be entitled to the distributions that would have been paid had the number of earned LTIP Units been issued at the beginning of the performance period, with such distributions being paid in the form of cash or additional LTIP Units. Thereafter, distributions will be paid currently with respect to all earned LTIP Units, whether vested or unvested. The cost of the 2014 Outperformance Plan ( $27.9 million , subject to forfeitures), based on the portion of the 2014 Outperformance Plan granted as of March 31, 2016 , will be amortized into earnings through the final vesting period. We recorded compensation expense of $1.5 million and $1.4 million during the three months ended March 31, 2016 and 2015, respectively, related to the 2014 Outperformance Plan. Deferred Compensation Plan for Directors Under our Non-Employee Director's Deferral Program, which commenced July 2004, the Company's non-employee directors may elect to defer up to 100% of their annual retainer fee, chairman fees, meeting fees and annual stock grant. Unless otherwise elected by a participant, fees deferred under the program shall be credited in the form of phantom stock units. The program provides that a director's phantom stock units generally will be settled in an equal number of shares of common stock upon the earlier of (i) the January 1 coincident with or the next following such director's termination of service from the Board of Directors or (ii) a change in control by us, as defined by the program. Phantom stock units are credited to each non-employee director quarterly using the closing price of SL Green's common stock on the first business day of the respective quarter. Each participating non-employee director is also credited with dividend equivalents or phantom stock units based on the dividend rate for each quarter, which are either paid in cash currently or credited to the director’s account as additional phantom stock units. During the three months ended March 31, 2016, 6,319 phantom stock units were earned and 8,436 shares of common stock were issued to our board of directors. We recorded compensation expense of $1.6 million during the three months ended March 31, 2016 related to the Deferred Compensation Plan. As of March 31, 2016 , there were 87,087 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 March 31, 2016 , 89,148 shares of SL Green's common stock had been issued under the ESPP.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Loss	3 Months Ended
	Mar. 31, 2016
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 March 31, 2016 , 100,081,448 shares of common stock and no shares of excess stock were issued and outstanding. At-The-Market Equity Offering Program In July 2011, the Company, along with the Operating Partnership, entered into an "at-the-market" equity offering program, or ATM Program, to sell an aggregate up to $250.0 million of SL Green's common stock. During the year ended December 31, 2014, we sold 25,659 shares of our common stock out of the remaining balance of the ATM Program for aggregate net proceeds of $2.8 million . The net proceeds from these offerings were contributed to the Operating Partnership in exchange for 25,659 units of limited partnership interest of the Operating Partnership. 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 up to $300.0 million of SL Green's common stock. During the year ended December 31, 2014, we sold 1,626,999 shares of our common stock for aggregate net proceeds of $182.9 million . The net proceeds from these offerings were contributed to the Operating Partnership in exchange for 1,626,999 units of limited partnership interest of the Operating Partnership. 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 year ended December 31, 2015, we sold 91,180 shares of our common stock for aggregate net proceeds of $12.0 million . The net proceeds from these offerings were contributed to the Operating Partnership in exchange for 91,180 units of limited partnership interest of the Operating Partnership. Perpetual Preferred Stock We have 9,200,000 shares of our 6.50% Series I Cumulative Redeemable Preferred Stock, or the Series I Preferred Stock, outstanding with a mandatory liquidation preference of $25.00 per share. The Series I Preferred stockholders receive annual dividends of $1.625 per share paid on a quarterly basis and dividends are cumulative, subject to certain provisions. We are entitled to redeem the Series I Preferred Stock at par for cash at our option on or after August 10, 2017. In August 2012, we received $221.9 million in net proceeds from the issuance of the Series I Preferred Stock, which were recorded net of underwriters' discount and issuance costs, and contributed the net proceeds to the Operating Partnership in exchange for 9,200,000 units of 6.50% Series I Cumulative Redeemable Preferred Units of limited partnership interest, or the Series I Preferred Units. Dividend Reinvestment and Stock Purchase Plan In February 2015, the Company filed a registration statement with the SEC for our dividend reinvestment and stock purchase plan, or DRSPP, which automatically became effective upon filing. The Company registered 3,500,000 shares of SL Green's common stock under the DRSPP. The DRSPP commenced on September 24, 2001. Earnings per Share SL Green's earnings per share for the three months ended March 31, 2016 and 2015 are computed as follows (in thousands): Three Months Ended March 31, Numerator 2016 2015 Basic Earnings: Income attributable to SL Green common stockholders $ 23,221 $ 43,277 Effect of Dilutive Securities: Redemption of units to common shares 922 1,743 Diluted Earnings: Income attributable to SL Green common stockholders $ 24,143 $ 45,020 Three Months Ended March 31, Denominator 2016 2015 Basic Shares: Weighted average common stock outstanding 100,051 98,402 Effect of Dilutive Securities: Operating Partnership units redeemable for common shares 3,974 3,964 Stock-based compensation plans 234 653 Diluted weighted average common stock outstanding 104,259 103,019 SL Green has excluded 1,349,019 and 203,975 common stock equivalents from the diluted shares outstanding for the three months ended March 31, 2016 and 2015, respectively, as they were anti-dilutive.
SL Green Realty Corp
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Loss of the Company/Operating Partnership	Accumulated Other Comprehensive Loss The following tables set forth the changes in accumulated other comprehensive income (loss) by component as of March 31, 2016 (in thousands): Net unrealized (loss) gain on derivative instruments ( 1 ) SL Green’s share of joint venture net unrealized (loss) gain on derivative instruments ( 2 ) Unrealized gain (loss) on marketable securities Total Balance at December 31, 2015 $ (10,160 ) $ (592 ) $ 2,003 $ (8,749 ) Other comprehensive loss before reclassifications (6,651 ) (2,658 ) (1,194 ) (10,503 ) Amounts reclassified from accumulated other comprehensive income 2,080 (50 ) — 2,030 Balance at March 31, 2016 $ (14,731 ) $ (3,300 ) $ 809 $ (17,222 ) ____________________________________________________________________ (1) Amount reclassified from accumulated other comprehensive income (loss) is included in interest expense in the respective consolidated statements of operations. As of March 31, 2016 and December 31, 2015 , the deferred net losses from these terminated hedges, which is included in accumulated other comprehensive loss relating to net unrealized loss on derivative instrument, was $9.2 million and $9.7 million , respectively. (2) Amount reclassified from accumulated other comprehensive income (loss) is included in equity in net income from unconsolidated joint ventures in the respective consolidated statements of operations.

Fair Value Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2016
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 consists of three broad levels: Level 1 - quoted prices (unadjusted) in active markets for identical assets or liabilities that the reporting entity can access at the measurement date; Level 2 - inputs other than quoted prices included within Level 1, that are observable for the asset or liability, either directly or indirectly; and Level 3 - unobservable inputs for the asset or liability that are used when little or no market data is available. We follow this hierarchy for our assets and liabilities measured at fair value on a recurring and nonrecurring basis. In instances in which the determination of the fair value measurement is based on inputs from different levels of the fair value hierarchy, the level in the fair value hierarchy within which the entire fair value measurement falls is based on the lowest level of input that is significant to the fair value measurement in its entirety. Our assessment of the significance of the particular input to the fair value measurement in its entirety requires judgment and considers factors specific to the asset or liability. The following tables set forth the assets and liabilities that we measure at fair value on a recurring and non-recurring basis by their levels in the fair value hierarchy at March 31, 2016 and December 31, 2015 (in thousands): March 31, 2016 Total Level 1 Level 2 Level 3 Assets: Marketable securities $ 43,915 $ 4,132 $ 39,783 $ — Interest rate cap and swap agreements (included in other assets) $ 6 $ — $ 6 $ — Liabilities: Interest rate cap and swap agreements (included in accrued interest payable and other liabilities) $ 2,600 $ — $ 2,600 $ — Interest rate cap and swap agreements (included in liabilities related to assets held for sale) $ 12,077 $ — $ 12,077 $ — December 31, 2015 Total Level 1 Level 2 Level 3 Assets: Marketable securities $ 45,138 $ 4,704 $ 40,434 $ — Interest rate cap and swap agreements (included in other assets) $ 204 $ — $ 204 $ — Liabilities: Interest rate cap and swap agreements (included in accrued interest payable and other liabilities) $ 10,776 $ — $ 10,776 $ — We determine other than temporary impairment in real estate investments and debt and preferred equity investments, including intangibles, utilizing cash flow projections that apply, among other things, estimated revenue and expense growth rates, discount rates and capitalization rates, which are classified as Level 3 inputs. The marketable securities classified as Level 1 were derived from quoted prices in active markets. The valuation technique used to measure the fair value of the marketable securities classified as Level 2 were valued based on quoted market prices or model driven valuations using the significant inputs derived from or corroborated by observable market data. Marketable securities in an unrealized loss position are not considered to be other than temporarily impaired. We do not intend to sell these securities and it is not more likely than not that we will be required to sell the investments before recovery of their amortized cost bases. The fair value of derivative instruments is based on current market data received from financial sources that trade such instruments and are based on prevailing market data and derived from third party proprietary models based on well-recognized financial principles and reasonable estimates about relevant future market conditions, which are classified as Level 2 inputs. The financial assets and liabilities that are not measured at fair value on our consolidated balance sheets include cash and cash equivalents, restricted cash, accounts receivable, accounts payable and accrued expenses, debt and preferred equity investments, mortgages and other loans payable and other secured and unsecured debt. The carrying amount of cash and cash equivalents, restricted cash, accounts receivable, and accounts payable and accrued expenses reported in our consolidated balance sheets approximates fair value due to the short term nature of these instruments. The fair value of debt and preferred equity investments, which is classified as Level 3, is estimated by discounting the future cash flows using current interest rates at which similar loans with the same maturities would be made to borrowers with similar credit ratings. The fair value of borrowings, which is classified as Level 3, is estimated by discounting the contractual cash flows of each debt to their present value using adjusted market interest rates, which is provided by a third-party specialist. The following table provides the carrying value and fair value of these financial instruments as of March 31, 2016 and December 31, 2015 (in thousands): March 31, 2016 December 31, 2015 Carrying Value Fair Value Carrying Value Fair Value Debt and preferred equity investments $ 1,378,616 (1) $ 1,670,020 (1) Fixed rate debt (2) $ 7,154,930 $ 7,507,340 $ 7,232,254 $ 7,591,388 Variable rate debt (2) 2,908,887 2,905,459 3,202,494 3,179,186 $ 10,063,817 $ 10,412,799 $ 10,434,748 $ 10,770,574 ____________________________________________________________________ (1) At March 31, 2016 , debt and preferred equity investments had an estimated fair value ranging between $1.4 billion and $1.5 billion . At December 31, 2015, debt and preferred equity investments had an estimated fair value ranging between $1.7 billion and $1.8 billion . (2) Includes the $1.0 billion fixed rate mortgage and $446.0 million variable rate mortgage at 388-390 Greenwich Street that is included in liabilities related to assets held for sale on the consolidated balance sheet at March 31, 2016. Disclosure about fair value of financial instruments was based on pertinent information available to us as of March 31, 2016 and December 31, 2015 . Although we are not aware of any factors that would significantly affect the reasonable fair value amounts, such amounts have not been comprehensively revalued for purposes of these financial statements since that date and current estimates of fair value may differ significantly from the amounts presented herein.

Financial Instruments_ Derivati

Financial Instruments: Derivatives and Hedging	3 Months Ended
	Mar. 31, 2016
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 value at inception and fair value of our consolidated derivative financial instruments at March 31, 2016 based on Level 2 information. The notional value is an indication of the extent of our involvement in these instruments at that time, but does not represent exposure to credit, interest rate or market risks (amounts in thousands). Notional Value Strike Rate Effective Date Expiration Date Balance Sheet Location Fair Value Interest Rate Cap - Sold $ 504,000 4.750 % May 2014 May 2016 Other Liabilities $ — Interest Rate Cap - Sold 500,000 4.750 % November 2014 May 2016 Other Liabilities — Interest Rate Cap 117,392 6.000 % October 2014 October 2016 Other Liabilities — Interest Rate Swap 200,000 0.938 % October 2014 December 2017 Other Liabilities (985 ) Interest Rate Swap 150,000 0.940 % October 2014 December 2017 Other Liabilities (743 ) Interest Rate Swap 150,000 0.940 % October 2014 December 2017 Other Liabilities (743 ) Interest Rate Swap 30,000 2.295 % July 2010 June 2016 Other Liabilities (109 ) Interest Rate Swap 14,409 0.500 % January 2015 January 2017 Other Assets 5 Interest Rate Swap 8,018 0.852 % February 2015 February 2017 Other Liabilities (20 ) Interest Rate Cap 137,500 4.000 % September 2015 September 2017 Other Assets 1 $ (2,594 ) Financial Instruments related to assets held for sale: Interest Rate Cap $ 504,000 4.750 % May 2014 May 2016 Other Liabilities $ — Interest Rate Cap 500,000 4.750 % October 2014 May 2016 Other Liabilities — Interest Rate Cap 446,000 4.750 % October 2014 May 2016 Other Liabilities — Interest Rate Swap 144,000 2.236 % December 2012 December 2017 Other Liabilities (3,902 ) Interest Rate Swap 86,400 1.948 % December 2012 December 2017 Other Liabilities (1,916 ) Interest Rate Swap 72,000 2.310 % December 2012 December 2017 Other Liabilities (2,042 ) Interest Rate Swap 72,000 1.345 % December 2012 December 2017 Other Liabilities (856 ) Interest Rate Swap 72,000 2.310 % December 2012 December 2017 Other Liabilities (2,042 ) Interest Rate Swap 57,600 1.990 % December 2012 December 2017 Other Liabilities (1,319 ) $ (12,077 ) Total $ (14,671 ) During the three months ended March 31, 2016 and 2015, we recorded a gain on the changes in the fair value of $37,000 and $1,000 , 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 March 31, 2016 , the fair value of derivatives in a net liability position including accrued interest but excluding any adjustment for nonperformance risk related to these agreements was $15.1 million . As of March 31, 2016 , the Company has not posted any collateral related to these agreements and was not in breach of any agreement provisions. If the Company had breached any of these provisions, it could have been required to settle its obligations under the agreements at their aggregate termination value of $15.1 million at March 31, 2016 . Gains and losses on terminated hedges are included in accumulated other comprehensive loss, and are recognized into earnings over the term of the related mortgage obligation. Over time, the realized and unrealized gains and losses held in accumulated other comprehensive loss will be reclassified into earnings as an adjustment to interest expense in the same periods in which the hedged interest payments affect earnings. We estimate that $6.5 million of the current balance held in accumulated other comprehensive loss will be reclassified into interest expense and $1.7 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 March 31, 2016 and 2015 , respectively (in thousands): Amount of (Loss) Gain Recognized in Other Comprehensive Loss (Effective Portion) Location of (Loss) Reclassified from Accumulated Other Comprehensive Loss into Income Amount of Loss Reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion) Location of (Loss) or Gain Recognized in Income on Derivative Amount of (Loss) or Gain Recognized into Income (Ineffective Portion) Three months ended March 31 Three months ended March 31 Three months ended March 31 Derivative 2016 2015 2016 2015 2016 2015 Interest Rate Swaps/Caps $ (6,919 ) $ (7,521 ) Interest expense $ 2,163 $ 2,747 Interest expense $ (39 ) $ (410 ) Share of unconsolidated joint ventures' derivative instruments (2,765 ) (1,237 ) Equity in net income from unconsolidated joint ventures 351 331 Equity in net income from unconsolidated joint ventures (436 ) (16 ) $ (9,684 ) $ (8,758 ) $ 2,514 $ 3,078 $ (475 ) $ (426 )

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Legal Proceedings As of March 31, 2016 , the Company and the Operating Partnership were not involved in any material litigation nor, to management's knowledge, was any material litigation threatened against us or our portfolio which if adversely determined could have a material adverse impact on us 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. 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 March 31, 2016 (in thousands): Capital lease Non-cancellable operating leases Remaining 2016 $ 1,705 $ 23,142 2017 2,387 31,049 2018 2,387 31,049 2019 2,411 31,066 2020 2,620 31,436 Thereafter 825,483 764,352 Total minimum lease payments 836,993 $ 912,094 Amount representing interest (795,439 ) Capital lease obligations $ 41,554

Segment Information

Segment Information	3 Months Ended
	Mar. 31, 2016
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 months ended March 31, 2016 and 2015 , and selected asset information as of March 31, 2016 and December 31, 2015 , regarding our operating segments are as follows (in thousands): Real Estate Segment Debt and Preferred Equity Segment Total Company Total revenues Three months ended: March 31, 2016 $ 400,707 $ 54,737 $ 455,444 March 31, 2015 354,230 42,069 396,299 Income from continuing operations before equity in net gain on sale of interest in unconsolidated joint venture/real estate and gain on sale of real estate Three months ended: March 31, 2016 $ (39,031 ) $ 47,846 $ 8,815 March 31, 2015 6,759 35,467 42,226 Total assets As of: March 31, 2016 $ 18,195,830 $ 1,390,138 $ 19,585,968 December 31, 2015 18,045,370 1,682,276 19,727,646 Income from continuing operations represents total revenues less total expenses for the real estate segment and total investment income less allocated interest expense for the debt and preferred equity segment. Interest costs for the debt and preferred equity segment includes actual costs incurred for investments collateralizing the MRA. Interest is imputed on the remaining investments using our 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 $24.0 million and $25.5 million for the three months ended March 31, 2016 and 2015 , respectively) to the debt and preferred equity segment since we base performance on the individual segments prior to allocating marketing, general and administrative expenses. All other expenses, except interest, relate entirely to the real estate assets. There were no transactions between the above two segments. The table below reconciles income from continuing operations to net income for the three months ended March 31, 2016 , and 2015 (in thousands): Three months ended March 31, 2016 2015 Income from continuing operations before equity in net gain on sale of interest in unconsolidated joint venture/real estate and gain on sale of real estate $ 8,815 $ 42,226 Equity in net gain on sale of interest in unconsolidated joint venture/real estate 9,915 — Gain on sale of real estate 13,773 — Income from continuing operations 32,503 42,226 Net income from discontinued operations — 427 Gain on sale of discontinued operations — 12,983 Net income $ 32,503 $ 55,636

Significant Accounting Polici31

Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2016
Accounting Policies [Abstract]
Principles of Consolidation	Principles of Consolidation The consolidated financial statements include our accounts and those of our subsidiaries, which are wholly-owned or controlled by us. Entities which we do not control through our voting interest and entities which are variable interest entities, but where we are not the primary beneficiary, are accounted for under the equity method 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 March 31, 2016 and December 31, 2015 are $1.8 billion and $200.7 million , respectively, related to our consolidated VIEs. Included in mortgages and other loans payable on our consolidated balance sheets as of March 31, 2016 and December 31, 2015 are $673.9 million and $104.5 million , respectively, collateralized by the real estate assets of the related consolidated VIEs. As of March 31, 2016 , assets held for sale and liabilities related to assets held for sale on the consolidated balance sheets did not include amounts related to consolidated VIEs. A noncontrolling interest in a consolidated subsidiary is defined as the portion of the equity (net assets) in a subsidiary not attributable, directly or indirectly, to us. Noncontrolling interests are required to be presented as a separate component of equity in the consolidated balance sheet and the presentation of net income is modified to present earnings and other comprehensive income attributed to controlling and noncontrolling interests. We assess the accounting treatment for each joint venture and debt and preferred equity investment. This assessment includes a review of each joint venture or limited liability company agreement to determine which party has what rights and whether those rights are protective or participating. For all VIEs, we review such agreements in order to determine which party has the power to direct the activities that most significantly impact the entity's economic performance. In situations where we and our partner approve, among other things, the annual budget, receive a detailed monthly reporting package, meet on a quarterly basis to review the results of the joint venture, review and approve the joint venture's tax return before filing, and approve all leases that cover more than a nominal amount of space relative to the total rentable space at each property, we do not consolidate the joint venture as we consider these to be substantive participation rights that result in shared power of the activities that most significantly impact the performance of the joint venture. Our joint venture agreements typically contain certain protective rights such as requiring partner approval to sell, finance or refinance the property and the payment of capital expenditures and operating expenditures outside of the approved budget or operating plan.
Investment in Commercial Real Estate Properties	Investment in Commercial Real Estate Properties On a periodic basis, we assess whether there are any indications that the value of our real estate properties may be other than temporarily impaired or that their carrying value may not be recoverable. A property's value is considered impaired if management's estimate of the aggregate future cash flows (undiscounted and without interest charges for consolidated properties) to be generated by the property is less than the carrying value of the property. To the extent impairment has occurred, the loss will be measured as the excess of the carrying amount of the property over the calculated fair value of the property. We also evaluate our real estate properties for potential impairment when a real estate property has been classified as held for sale. Real estate assets held for sale are valued at the lower of either their carrying value or fair value less costs to sell. We do not believe that there were any indicators of impairment at any of our consolidated properties at March 31, 2016 . We allocate the purchase price of real estate to land and building (inclusive of tenant improvements) and, if determined to be material, intangibles, such as the value of above- and below-market leases and origination costs associated with the in-place leases. We depreciate the amount allocated to building (inclusive of tenant improvements) over their estimated useful lives, which generally range from three to 40 years . We amortize the amount allocated to the above- and below-market leases over the remaining term of the associated lease, which generally range from one to 14 years, and record it as either an increase (in the case of below-market leases) or a decrease (in the case of above-market leases) to rental income. We amortize the amount allocated to the values associated with in-place leases over the expected term of the associated lease, which generally ranges from one to 14 years. If a tenant vacates its space prior to the contractual termination of the lease and no rental payments are being made on the lease, any unamortized balance of the related intangible will be written off. The tenant improvements and origination costs are amortized as an expense over the remaining life of the lease (or charged against earnings if the lease is terminated prior to its contractual expiration date). We assess fair value of the leases based on estimated cash flow projections that utilize appropriate discount and capitalization rates and available market information. Estimates of future cash flows are based on a number of factors including the historical operating results, known trends, and market/economic conditions that may affect the property. To the extent acquired leases contain fixed rate renewal options that are below-market and determined to be material, we amortize such below-market lease value into rental income over the renewal period.
Fair Value Measurements	Fair Value Measurements We are required to disclose fair value information with regard to our financial instruments, whether or not recognized in the consolidated balance sheets, for which it is practical to estimate fair value. The FASB guidance defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants on the measurement date. We measure and/or disclose the estimated fair value of financial assets and liabilities based on a hierarchy that distinguishes between market participant assumptions based on market data obtained from sources independent of the reporting entity and the reporting entity’s own assumptions about market participant assumptions. This hierarchy consists of three broad levels: Level 1 - quoted prices (unadjusted) in active markets for identical assets or liabilities that the reporting entity can access at the measurement date; Level 2 - inputs other than quoted prices included within Level 1, that are observable for the asset or liability, either directly or indirectly; and Level 3 - unobservable inputs for the asset or liability that are used when little or no market data is available. We follow this hierarchy for our assets and liabilities measured at fair value on a recurring and nonrecurring basis. In instances in which the determination of the fair value measurement is based on inputs from different levels of the fair value hierarchy, the level in the fair value hierarchy within which the entire fair value measurement falls is based on the lowest level of input that is significant to the fair value measurement in its entirety. Our assessment of the significance of the particular input to the fair value measurement in its entirety requires judgment and considers factors specific to the asset or liability. We determine other than temporary impairment in real estate investments and debt and preferred equity investments, including intangibles, utilizing cash flow projections that apply, among other things, estimated revenue and expense growth rates, discount rates and capitalization rates, which are classified as Level 3 inputs. The marketable securities classified as Level 1 were derived from quoted prices in active markets. The valuation technique used to measure the fair value of the marketable securities classified as Level 2 were valued based on quoted market prices or model driven valuations using the significant inputs derived from or corroborated by observable market data. Marketable securities in an unrealized loss position are not considered to be other than temporarily impaired. We do not intend to sell these securities and it is not more likely than not that we will be required to sell the investments before recovery of their amortized cost bases. The fair value of derivative instruments is based on current market data received from financial sources that trade such instruments and are based on prevailing market data and derived from third party proprietary models based on well-recognized financial principles and reasonable estimates about relevant future market conditions, which are classified as Level 2 inputs. The financial assets and liabilities that are not measured at fair value on our consolidated balance sheets include cash and cash equivalents, restricted cash, accounts receivable, accounts payable and accrued expenses, debt and preferred equity investments, mortgages and other loans payable and other secured and unsecured debt. The carrying amount of cash and cash equivalents, restricted cash, accounts receivable, and accounts payable and accrued expenses reported in our consolidated balance sheets approximates fair value due to the short term nature of these instruments. The fair value of debt and preferred equity investments, which is classified as Level 3, is estimated by discounting the future cash flows using current interest rates at which similar loans with the same maturities would be made to borrowers with similar credit ratings. The fair value of borrowings, which is classified as Level 3, is estimated by discounting the contractual cash flows of each debt to their present value using adjusted market interest rates, which is provided by a third-party specialist.
Investment in Marketable Securities	Investment in Marketable Securities We designate a security as held-to-maturity, available-for-sale, or trading at acquisition. As of March 31, 2016 , we did not have any securities designated as held-to-maturity or trading. We account for our available-for-sale securities at fair value pursuant to Accounting Standards Codification, or ASC, 820-10, with the net unrealized gains or losses reported as a component of accumulated other comprehensive income or loss. Any unrealized losses that are determined to be other-than-temporary are recognized in earnings up to their credit component. The cost of bonds and marketable securities sold is determined using the specific identification method.
Investments in Unconsolidated Joint Ventures	Investments in Unconsolidated Joint Ventures We assess our investments in unconsolidated joint ventures for recoverability, and if it is determined that a loss in value of the investment is other than temporary, we write down the investment to its fair value. We evaluate our equity investments for impairment based on the joint ventures' projected discounted cash flows. We do not believe that the values of any of our equity investments were impaired at March 31, 2016 . We may originate loans for real estate acquisition, development and construction, where we expect to receive some of the residual profit from such projects. When the risk and rewards of these arrangements are essentially the same as an investor or joint venture partner, we account for these arrangements as real estate investments under the equity method of accounting for investments. Otherwise, we account for these arrangements consistent with our loan accounting for our debt and preferred equity investments.
Revenue Recognition	Revenue Recognition Rental revenue is recognized on a straight-line basis over the term of the lease. Rental revenue recognition commences when the tenant takes possession or controls the physical use of the leased space. In order for the tenant to take possession, the leased space must be substantially ready for its intended use. To determine whether the leased space is substantially ready for its intended use, management evaluates whether we are or the tenant is the owner of tenant improvements for accounting purposes. When management concludes that we are the owner of tenant improvements, rental revenue recognition begins when the tenant takes possession of the finished space, which is when such tenant improvements are substantially complete. In certain instances, when management concludes that we are not the owner (the tenant is the owner) of tenant improvements, rental revenue recognition begins when the tenant takes possession of or controls the space. When management concludes that we are the owner of tenant improvements for accounting purposes, we record amounts funded to construct the tenant improvements as a capital asset. For these tenant improvements, we record amounts reimbursed by tenants as a reduction of the capital asset. When management concludes that the tenant is the owner of tenant improvements for accounting purposes, we record our contribution towards those improvements as a lease incentive, which is included in deferred costs, net on our consolidated balance sheets and amortized as a reduction to rental revenue on a straight-line basis over the term of the lease. The excess of rents recognized over amounts contractually due pursuant to the underlying leases are included in deferred rents receivable on the consolidated balance sheets. We establish, on a current basis, an allowance for future potential tenant credit losses, which may occur against this account. The balance reflected on the consolidated balance sheets is net of such allowance. In addition to base rent, our tenants also generally will pay their pro rata share of increases in real estate taxes and operating expenses for the building over a base year. In some leases, in lieu of paying additional rent based upon increases in building operating expenses, the tenant will pay additional rent based upon increases in the wage rate paid to porters over the porters' wage rate in effect during a base year or increases in the consumer price index over the index value in effect during a base year. In addition, many of our leases contain fixed percentage increases over the base rent to cover escalations. Electricity is most often supplied by the landlord either on a sub-metered basis, or rent inclusion basis (i.e., a fixed fee is included in the rent for electricity, which amount may increase based upon increases in electricity rates or increases in electrical usage by the tenant). Base building services other than electricity (such as heat, air conditioning and freight elevator service during business hours, and base building cleaning) are typically provided at no additional cost, with the tenant paying additional rent only for services which exceed base building services or for services which are provided outside normal business hours. These escalations are based on actual expenses incurred in the prior calendar year. If the expenses in the current year are different from those in the prior year, then during the current year, the escalations will be adjusted to reflect the actual expenses for the current year. We record a gain on sale of real estate when title is conveyed to the buyer, subject to the buyer's financial commitment being sufficient to provide economic substance to the sale and provided that we have no substantial economic involvement with the buyer. Interest income on debt and preferred equity investments is accrued based on the outstanding principal amount and contractual terms of the instruments and when, in the opinion of management, it is deemed collectible. Some debt and preferred equity investments provide for accrual of interest at specified rates, which differ from current payment terms. Interest is recognized on such loans at the accrual rate subject to management's determination that accrued interest is ultimately collectible, based on the underlying collateral and operations of the borrower. If management cannot make this determination, interest income above the current pay rate is recognized only upon actual receipt. Deferred origination fees, original issue discounts and loan origination costs, if any, are recognized as an adjustment to the interest income over the terms of the related investments using the effective interest method. Fees received in connection with loan commitments are also deferred until the loan is funded and are then recognized over the term of the loan as an adjustment to yield. Discounts or premiums associated with the purchase of loans are amortized or accreted into interest income as a yield adjustment on the effective interest method based on expected cashflows through the expected maturity date of the related investment. If we purchase a debt or preferred equity investment at a discount, intend to hold it until maturity and expect to recover the full value of the investment, we accrete the discount into income as an adjustment to yield over the term of the investment. If we purchase a debt or preferred equity investment at a discount with the intention of foreclosing on the collateral, we do not accrete the discount. For debt investments acquired at a discount for credit quality, the difference between contractual cash flows and expected cash flows at acquisition is not accreted. Anticipated exit fees, the collection of which is expected, are also recognized over the term of the loan as an adjustment to yield. Debt and preferred equity investments are placed on a non-accrual status at the earlier of the date at which payments become 90 days past due or when, in the opinion of management, a full recovery of interest income becomes doubtful. Interest income recognition on any non-accrual debt or preferred equity investment is resumed when such non-accrual debt or preferred equity investment becomes contractually current and performance is demonstrated to be resumed. Interest is recorded as income on impaired loans only to the extent cash is received. We may syndicate a portion of the loans that we originate or sell the loans individually. When a transaction meets the criteria for sale accounting, we derecognize the loan sold and recognize gain or loss based on the difference between the sales price and the carrying value of the loan sold. Any related unamortized deferred origination fees, original issue discounts, loan origination costs, discounts or premiums at the time of sale are recognized as an adjustment to the gain or loss on sale, which is included in investment income on the consolidated statement of operations. Any fees received at the time of sale or syndication are recognized as part of investment income. Asset management fees are recognized on a straight-line basis over the term of the asset management agreement.
Reserve for Possible Credit Losses	Reserve for Possible Credit Losses The expense for possible credit losses in connection with debt and preferred equity investments is the charge to earnings to increase the allowance for possible credit losses to the level that we estimate to be adequate, based on Level 3 data, considering delinquencies, loss experience and collateral quality. Other factors considered include geographic trends, product diversification, the size of the portfolio and current economic conditions. Based upon these factors, we establish a provision for possible credit loss on each individual investment. When it is probable that we will be unable to collect all amounts contractually due, the investment is considered impaired. Where impairment is indicated on an investment that is held to maturity, a valuation allowance is measured based upon the excess of the recorded investment amount over the net fair value of the collateral. Any deficiency between the carrying amount of an asset and the calculated value of the collateral is charged to expense. We continue to assess or adjust our estimates based on circumstances of a loan and the underlying collateral. If additional information reflects increased recovery of our investment, we will adjust our reserves accordingly. There were no loan reserves recorded during three months ended March 31, 2016 and 2015. Debt and preferred equity investments held for sale are carried at the lower of cost or fair market value using available market information obtained through consultation with dealers or other originators of such investments as well as discounted cash flow models based on Level 3 data pursuant to ASC 820-10. As circumstances change, management may conclude not to sell an investment designated as held for sale. In such situations, the investment will be reclassified at its net carrying value to debt and preferred equity investments held to maturity. For these reclassified investments, the difference between the current carrying value and the expected cash to be collected at maturity will be accreted into income over the remaining term of the investment.
Income Taxes	Income Taxes SL Green is taxed as a REIT under Section 856(c) of the Code. As a REIT, SL Green generally is not subject to Federal income tax. To maintain its qualification as a REIT, SL Green must distribute at least 90% of its REIT taxable income to its stockholders and meet certain other requirements. If SL Green fails to qualify as a REIT in any taxable year, SL Green will be subject to Federal income tax on SL Green's taxable income at regular corporate rates. SL Green may also be subject to certain state, local and franchise taxes. Under certain circumstances, Federal income and excise taxes may be due on SL Green's undistributed taxable income. The Operating Partnership is a partnership and, as a result, all income and losses of the partnership are allocated to the partners for inclusion in their respective income tax returns. The only provision for income taxes included in the consolidated statements of operations relates to the Operating Partnership’s consolidated taxable REIT subsidiaries. The Operating Partnership may also be subject to certain state, local and franchise taxes. Pursuant to amendments to the Code that became effective January 1, 2001, we have elected, and may elect in the future, to treat certain of our existing or newly created corporate subsidiaries as taxable REIT subsidiaries, or TRSs. In general, TRSs may perform non-customary services for the tenants of the Company, hold assets that we cannot hold directly and generally may engage in any real estate or non-real estate related business. The TRSs generate income, resulting in Federal and state income tax liability for these entities. During the three months ended March 31, 2016 and 2015 , we recorded Federal, state and local tax provisions of $1.2 million and $0.3 million , respectively. We follow a two-step approach for evaluating uncertain tax positions. Recognition (step one) occurs when an enterprise concludes that a tax position, based solely on its technical merits, is more-likely-than-not to be sustained upon examination. Measurement (step two) determines the amount of benefit that is more-likely-than-not to be realized upon settlement. Derecognition of a tax position that was previously recognized would occur when a company subsequently determines that a tax position no longer meets the more-likely-than-not threshold of being sustained. The use of a valuation allowance as a substitute for derecognition of tax positions is prohibited.
Stock-Based Employee Compensation Plans	Stock-Based Employee Compensation Plans We have a stock-based employee compensation plan, described more fully in Note 14, "Share-based Compensation." The Company's stock options are recorded at fair value at the time of issuance. Fair value of the stock options is determined using the Black-Scholes option pricing model. The Black-Scholes model was developed for use in estimating the fair value of traded options, which have no vesting restrictions and are fully transferable. In addition, option valuation models require the input of highly subjective assumptions including the expected stock price volatility. Because our plan has characteristics significantly different from those of traded options and because changes in the subjective input assumptions can materially affect the fair value estimate, in our opinion, the existing models do not necessarily provide a reliable single measure of the fair value of the employee stock options. Compensation cost for stock options, if any, is recognized over the vesting period of the award. Our policy is to grant options with an exercise price equal to the quoted closing market price of the Company's common stock on the grant date. Awards of stock or restricted stock are expensed as compensation over the benefit period based on the fair value of the stock on the grant date. For share-based awards with a performance or market measure, we recognize compensation cost over the requisite service period, using the accelerated attribution expense method. The requisite service period begins on the date the compensation committee of SL Green's board of directors authorizes the award, adopts any relevant performance measures and communicates the award to the employees. For programs with awards that vest based on the achievement of a performance condition or market condition, we determine whether it is probable that the performance condition will be met, and estimate compensation cost based on the fair value of the award at the applicable reporting date estimated using a binomial model or market quotes. For share-based awards for which there is no pre-established performance measure, we recognize compensation cost over the service vesting period, which represents the requisite service period, on a straight-line basis. In accordance with the provisions of our share-based incentive compensation plans, we accept the return of shares of the Company's common stock, at the current quoted market price, from certain key employees to satisfy minimum statutory tax-withholding requirements related to shares that vested during the period. Awards can also be made in the form of a separate series of units of limited partnership interest in the Operating Partnership called long-term incentive plan units, or LTIP units. LTIP units, which can be granted either as free-standing awards or in tandem with other awards under our stock incentive plan, are valued by reference to the value of the Company's common stock at the time of grant, and are subject to such conditions and restrictions as the compensation committee of the Company's board of directors may determine, including continued employment or service, computation of financial metrics and/or achievement of pre-established performance goals and objectives.
Earnings per Share of the Company	Earnings per Share of the Company The Company presents both basic and diluted earnings per share, or EPS. Basic EPS excludes dilution and is computed by dividing net income or loss attributable to common stockholders by the weighted average number of common shares outstanding during the period. Basic EPS includes participating securities, consisting of unvested restricted stock that receive nonforfeitable dividends similar to shares of common stock. Diluted EPS reflects the potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted into common stock, where such exercise or conversion would result in a lower EPS amount. Diluted EPS also includes units of limited partnership interest. The dilutive effect of stock options is reflected in the weighted average diluted outstanding shares calculation by application of the treasury stock method. There is no dilutive effect for the exchangeable senior notes as the conversion premium will be paid in cash.
Earnings per Unit of the Operating Partnership	Earnings per Unit of the Operating Partnership The Operating Partnership presents both basic and diluted earnings per unit, or EPU. Basic EPU excludes dilution and is computed by dividing net income or loss attributable to common unitholders by the weighted average number of common units outstanding during the period. Basic EPU includes participating securities, consisting of unvested restricted units that receive nonforfeitable dividends similar to shares of common units. Diluted EPU reflects the potential dilution that could occur if securities or other contracts to issue common units were exercised or converted into common units, where such exercise or conversion would result in a lower EPU amount. The dilutive effect of unit options is reflected in the weighted average diluted outstanding units calculation by application of the treasury stock method. There is no dilutive effect for the exchangeable senior notes as the conversion premium will be paid in cash.
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from those estimates.
Concentrations of Credit Risk	Concentrations of Credit Risk Financial instruments that potentially subject us to concentrations of credit risk consist primarily of cash investments, debt and preferred equity investments and accounts receivable. We place our cash investments in excess of insured amounts with high quality financial institutions. The collateral securing our debt and preferred equity investments is located in New York City. See Note 5, "Debt and Preferred Equity Investments." We perform ongoing credit evaluations of our tenants and require most tenants to provide security deposits or letters of credit. Though these security deposits and letters of credit are insufficient to meet the total value of a tenant's lease obligation, they are a measure of good faith and a source of funds to offset the economic costs associated with lost rent and the costs associated with re-tenanting a space. Although the properties in our real estate portfolio are primarily located in Manhattan, we also have properties located in Brooklyn, Long Island, Westchester County, Connecticut and New Jersey. The tenants located in our buildings operate in various industries.
Reclassification	Reclassification Certain prior year balances have been reclassified to conform to our current year presentation.
Accounting Standards Updates	Accounting Standards Updates In March 2016, the FASB issued Accounting Standards Update (ASU) No. 2016-09, Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting. The guidance simplifies the accounting for share-based payment award transactions including: income tax consequences, classification of awards as either equity or liabilities and classification on the statement of cash flows. The guidance is effective for fiscal years beginning after December 15, 2016, including interim periods within those fiscal years. Early adoption is permitted. The Company has not yet adopted this new guidance and is currently evaluating the impact of adopting this new accounting standard on the Company’s consolidated financial statements. In March 2016, the FASB issued ASU 2016-07, Investments Equity Method and Joint Ventures (Topic 323). The guidance eliminates the requirement that an entity retroactively adopt the equity method of accounting if an investment qualifies for use of the equity method as a result of an increase in the level of ownership or degree of influence. The amendments require that the equity method investor add the cost of acquiring the additional interest in the investee to the current basis of the investor’s previously held interest and adopt the equity method of accounting as of the date the investment becomes qualified for equity method accounting. The guidance is effective for all entities for fiscal years beginning after 15 December 2016 and interim periods within those years. Early adoption is permitted in any interim or annual period. The Company has not yet adopted this new guidance and is currently evaluating the impact of adopting this new accounting standard on the Company’s consolidated financial statements. In February 2016, the FASB issued ASU 2016-02, Leases. The guidance requires lessees to recognize lease assets and lease liabilities for those leases classified as operating leases under the previous standard. The accounting applied by a lessor is largely unchanged from that applied under the previous standard. The Guidance is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. Early adoption is permitted. The Company has not yet adopted this new guidance and is currently evaluating the impact of adopting this new accounting standard on the Company’s consolidated financial statements. In January 2016, the FASB issued ASU 2016-01 (ASU825-10), Recognition and Measurement of Financial Assets and Financial Liabilities. The guidance requires entities to measure equity investments that do not result in consolidation and are not accounted for under the equity method at fair value and to record changes in instruments-specific credit risk for financial liabilities measured under the fair value option in other comprehensive income. The guidance is effective for fiscal years beginning after December 15, 2017, and for interim periods therein. The Company has not yet adopted this new guidance and is currently evaluating the impact of adopting this new accounting standard on the Company’s consolidated financial statements. In April 2015, the FASB issued final guidance to simplify the presentation of debt issuance costs by requiring debt issuance costs to be presented as a deduction from the corresponding debt liability (ASU 2015-03). The guidance requires that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability. The Company adopted the guidance effective January 1, 2016. Accordingly, as of March 31, 2016 and December 31, 2015, $105.3 million and $130.3 million , respectively of deferred debt issuance cost, net of amortization are presented as a direct reduction within Mortgages and other loans payable, Revolving credit facility, Term loan and senior unsecured notes on the Company's consolidated balance sheets. In February 2015, the FASB issued guidance that amends the current consolidation guidance, including introducing a separate consolidation analysis specific to limited partnerships and other similar entities (ASU 2015-02). Under this analysis, limited partnerships and other similar entities will be considered a VIE unless the limited partners hold substantive kick-out rights or participating rights. The Company adopted the guidance effective January 1, 2016. Under the revised guidance, certain entities, including the Operating Partnership, now qualify as variable interest entities while some of our entities originally classified as variable interest entities no longer meet the criteria. The change in designation did not have a material impact on our consolidated financial statements and did not change the consolidation conclusion on these entities. In May 2014, the FASB issued a new comprehensive revenue recognition guidance which requires us to recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which we expect to be entitled in exchange for those goods and services (ASU 2014-09). The guidance also requires enhanced disclosures to help users of financial statements better understand the nature, amount, timing, and uncertainty of revenue that is recognized. In March 2016 the FASB issued implementation guidance which clarifies principal versus agent considerations in reporting revenue gross versus net (ASU 2016-08). In April 2016, the FASB issued implementation guidance which clarifies the identification of performance obligations (ASU 2016-10). These ASUs are effective for annual and interim periods beginning after December 15, 2017. Early adoption is permitted, but not before interim and annual reporting periods beginning after December 15, 2016. The new guidance can be applied either retrospectively to each prior reporting period presented, or as a cumulative-effect adjustment as of the date of adoption. The Company has not yet adopted this guidance and is currently evaluating the new guidance to determine the impact it may have on our consolidated financial statements.

Organization and Basis of Pre32

Organization and Basis of Presentation (Tables)	3 Months Ended
	Mar. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of commercial office properties	As of March 31, 2016 , we owned the following interests in properties in the New York Metropolitan area, primarily in midtown Manhattan. Our investments in the New York Metropolitan area also include investments in Brooklyn, Long Island, Westchester County, Connecticut and New Jersey, which are collectively known as the Suburban properties: Consolidated Unconsolidated Total Location Property Type Number of Properties Approximate Square Feet (unaudited) Number of Properties Approximate Square Feet (unaudited) Number of Properties Approximate Square Feet (unaudited) Weighted Average Occupancy (1) (unaudited) Commercial: Manhattan Office 27 (2) 21,003,606 6 4,244,139 33 25,247,745 95.9 % Retail 10 (3) 418,093 9 347,970 19 766,063 88.1 % Development/Redevelopment 3 42,635 3 733,624 6 776,259 30.5 % Fee Interest 1 176,530 — — 1 176,530 100.0 % 41 21,640,864 18 5,325,733 59 26,966,597 93.8 % Suburban Office 26 4,235,300 2 640,000 28 4,875,300 81.7 % Retail 1 52,000 — — 1 52,000 100.0 % Development/Redevelopment 1 1,000 1 — 2 1,000 100.0 % 28 4,288,300 3 640,000 31 4,928,300 81.9 % Total commercial properties 69 25,929,164 21 5,965,733 90 31,894,897 92.0 % Residential: Manhattan Residential 4 (3) 762,587 17 2,193,424 21 2,956,011 95.4 % Suburban Residential — — — — — — — % Total residential properties 4 762,587 17 2,193,424 21 2,956,011 95.4 % Total portfolio (3) 73 26,691,751 38 8,159,157 111 34,850,908 92.3 % ____________________________________________________________________ (1) The weighted average occupancy for commercial properties represents the total occupied square feet divided by total acquisition square footage. The weighted average occupancy for residential properties represents the total occupied units divided by total available units. (2) Includes the property at 388-390 Greenwich Street, which is classified as held for sale at March 31, 2016. (3) As of March 31, 2016 , we owned a building that was comprised of approximately 270,132 square feet (unaudited) of retail space and approximately 222,855 square feet (unaudited) of residential space. For the purpose of this report, we have included the building in the retail properties count and have bifurcated the square footage into the retail and residential components.

Significant Accounting Polici33

Significant Accounting Policies (Tables)	3 Months Ended
	Mar. 31, 2016
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 March 31, 2016 and December 31, 2015 (in thousands): March 31, 2016 December 31, 2015 Identified intangible assets (included in other assets): Gross amount $ 1,022,698 $ 939,518 Accumulated amortization (407,401 ) (403,747 ) Net (1) $ 615,297 $ 535,771 Identified intangible liabilities (included in deferred revenue): Gross amount $ 863,882 $ 866,561 Accumulated amortization (489,674 ) (486,928 ) Net (1) $ 374,208 $ 379,633 ____________________________________________________________________ (1) As of March 31, 2016 and December 31, 2015, $242.8 million and $0.2 million , respectively and $149.9 million and $0.1 million , respectively, of net intangible assets and net intangible liabilities, were reclassified to assets held for sale and liabilities related to assets held for sale.
Schedule of marketable securities	At March 31, 2016 and December 31, 2015 , we held the following marketable securities (in thousands): March 31, 2016 December 31, 2015 Equity marketable securities $ 4,132 $ 4,704 Commercial mortgage-backed securities 39,783 40,434 Total marketable securities available-for-sale $ 43,915 $ 45,138

Property Acquisitions (Tables)

Property Acquisitions (Tables)	3 Months Ended
	Mar. 31, 2016
2016 Acquisitions
Property Acquisitions
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed	During the three months ended March 31, 2016, the property listed below was acquired from a third party. The following summarizes our preliminary allocation of the purchase price of the assets acquired and liabilities assumed upon the closing of this acquisition (in thousands): 183 Broadway (1) Acquisition Date March 2016 Ownership Type Fee Interest Property Type Retail/Residential Purchase Price Allocation: Land $ 26,640 Building and building leasehold 2,960 Above-market lease value — Acquired in-place leases — Other assets, net of other liabilities — Assets acquired $ 29,600 Mark-to-market assumed debt — Below-market lease value — Derivatives — Liabilities assumed — Purchase price $ 29,600 Net consideration funded by us at closing, excluding consideration financed by debt $ 29,600 Equity and/or debt investment held $ — Debt assumed $ — (1) We are currently in the process of analyzing the purchase price allocation and, as such, we have not allocated any value to intangible assets such as above- and below-market lease or in-place leases.
2015 Acquisitions
Property Acquisitions
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed	During the three months ended March 31, 2016, we finalized the purchase price allocations based on facts and circumstances that existed at the acquisition dates for the following 2015 acquisitions (in thousands): 11 Madison Avenue (1) 1640 Flatbush Avenue (1) Acquisition Date August 2015 March 2015 Ownership Type Fee Interest Fee Interest Property Type Office Retail Purchase Price Allocation: Land $ 675,776 $ 6,226 Building and building leasehold 1,553,602 501 Above-market lease value 19,764 — Acquired in-place leases 366,949 146 Other assets, net of other liabilities — — Assets acquired 2,616,091 6,873 Mark-to-market assumed debt — — Below-market lease value (187,732 ) (73 ) Derivatives — — Liabilities assumed (187,732 ) (73 ) Purchase price $ 2,428,359 $ 6,800 Net consideration funded by us at closing, excluding consideration financed by debt $ — $ — Equity and/or debt investment held $ — $ — Debt assumed $ — $ — (1) Based on our preliminary analysis of the purchase price, we had allocated $849.9 million and $1.6 billion to land and building, respectively, at 11 Madison Avenue and $6.1 million and $0.7 million to land and building, respectively, at 1640 Flatbush Avenue. The impact to our consolidated statement of operations for the three months ended March 31, 2016 was $6.0 million in rental revenue for the amortization of aggregate below-market leases and $15.4 million of depreciation expense.

Properties Held for Sale and 35

Properties Held for Sale and Property Dispositions (Tables)	3 Months Ended
	Mar. 31, 2016
Discontinued Operations and Disposal Groups [Abstract]
Summary of properties sold and income from discontinued operations	The following table summarizes the properties sold during the three months ended March 31, 2016 : Property Disposition Date Property Type Approximate Square Feet Sales Price (1) (in millions) Gain on Sale (2) (in millions) 248-252 Bedford Avenue February 2016 Residential 66,611 $ 55.0 $ 13.8 885 Third Avenue (3) February 2016 Land 607,000 453.0 — ____________________________________________________________________ (1) Sales price represents the actual sales price for a property or the gross asset valuation for interests in a property. (2) The gain on sale for 248-252 Bedford Avenue is net of $1.3 million in employee compensation awards accrued in connection with the realization of the investment gain as a bonus to certain employees that were instrumental in realizing the gain on sale. Additionally, amounts do not include adjustments for expenses recorded in subsequent periods. (3) In February 2016, we closed on the sale of 885 Third Avenue. The sale did not meet the criteria for sale accounting and as a result the property remains on our consolidated balance sheet until the criteria is met. An estimated loss relating to the sale of $6.6 million was recorded in December 2015. Discontinued operations for the three months ended March 31, 2015 included the results of operations of 180 Maiden Lane, which was held for sale at December 31, 2014 and sold in January 2015, as follows (in thousands): March 31, 2015 Revenues Rental revenue $ 236 Escalation and reimbursement revenues (127 ) Other income — Total revenues 109 Operating expenses (631 ) Real estate taxes 250 Ground rent — Transaction related costs (49 ) Depreciable real estate reserves — Interest expense, net of interest income 109 Amortization of deferred financing costs 3 Depreciation and amortization — Total expenses (318 ) Net income from discontinued operations $ 427

Debt and Preferred Equity Inv36

Debt and Preferred Equity Investments (Tables)	3 Months Ended
	Mar. 31, 2016
Investments, Debt and Equity Securities [Abstract]
Summary of debt investments	As of March 31, 2016 and December 31, 2015 we held the following debt investments with an aggregate weighted average current yield of 10.47% at March 31, 2016 (in thousands): Loan Type March 31, 2016 Future Funding Obligations March 31, 2016 Senior Financing March 31, 2016 Carrying Value (1) December 31, 2015 Carrying Value (1) Initial Maturity Date Fixed Rate Investments: Mezzanine Loan (2a) $ — $ 115,000 $ 12,917 $ 24,916 July 2016 Mezzanine Loan — 165,000 72,174 72,102 November 2016 Loan Type March 31, 2016 Future Funding Obligations March 31, 2016 Senior Financing March 31, 2016 Carrying Value (1) December 31, 2015 Carrying Value (1) Initial Maturity Date Jr. Mortgage Participation/Mezzanine Loan — 1,109,000 185,266 104,661 March 2017 Mezzanine Loan (2b) — 502,100 41,137 41,115 June 2017 Mezzanine Loan — 539,000 49,715 49,691 July 2018 Mortgage Loan (3) — — 26,275 26,262 February 2019 Mortgage Loan — — 480 513 August 2019 Mezzanine Loan — 15,000 3,500 3,500 September 2021 Mezzanine Loan (2c) — 89,527 19,937 19,936 November 2023 Mezzanine Loan — 95,000 30,000 30,000 January 2025 Jr. Mortgage Participation (4) — — — 49,000 Other (4)(5) — — — 23,510 Other (4)(5) — — — 66,183 Total fixed rate $ — $ 2,629,627 $ 441,401 $ 511,389 Floating Rate Investments: Mortgage/Mezzanine Loan (6) 4,693 — 100,837 94,901 April 2016 Mezzanine Loan (2d) — 160,000 22,639 22,625 June 2016 Mezzanine Loan (7) — 745,215 74,311 74,700 September 2016 Mezzanine Loan — 360,000 99,662 99,530 November 2016 Mezzanine Loan 10,003 136,384 51,217 49,751 December 2016 Mezzanine Loan 281 39,201 13,745 13,731 December 2016 Mortgage/Mezzanine Loan (2e) 47,001 — 133,395 134,264 January 2017 Mezzanine Loan 1,127 118,949 28,754 28,551 January 2017 Mezzanine Loan (2f)(8) — 40,000 15,132 68,977 June 2017 Mortgage/Mezzanine Loan — — 22,896 22,877 July 2017 Mortgage/Mezzanine Loan — — 16,915 16,901 September 2017 Senior Mortgage 4,394 — 19,416 19,282 October 2017 Mezzanine Loan — 60,000 14,916 14,904 November 2017 Mezzanine Loan (2g) — 85,000 14,944 29,505 December 2017 Mezzanine Loan (2h) — 65,000 14,483 28,563 December 2017 Mortgage/Mezzanine Loan (2i) 795 — 14,968 14,942 December 2017 Jr. Participation — 40,000 19,862 19,846 April 2018 Mezzanine Loan — 175,000 34,752 34,725 April 2018 Jr. Participation/Mezzanine Loan (2j) — 55,000 10,506 20,510 July 2018 Mortgage/Mezzanine Loan (9) 523 20,523 10,806 31,210 August 2018 Mezzanine Loan — 33,000 26,794 26,777 December 2018 Mezzanine Loan 5,267 156,383 53,953 52,774 December 2018 Mezzanine Loan 26,204 217,202 52,336 49,625 December 2018 Mezzanine Loan — 16,383 5,340 — January 2019 Mezzanine Loan — 38,000 21,855 21,845 March 2019 Mezzanine Loan (10) — — — 66,398 Mortgage/Mezzanine Loan (4) — — — 18,395 Jr. Mortgage Participation/ Mezzanine Loan (11) — — — 40,346 Total floating rate $ 100,288 $ 2,561,240 $ 894,434 $ 1,116,455 Total $ 100,288 $ 5,190,867 $ 1,335,835 $ 1,627,844 ____________________________________________________________________ (1) Carrying value is net of discounts, premiums, original issue discounts and deferred origination fees. (2) Carrying value is net of the following amount that was participated out, which is included in other assets and other liabilities on the consolidated balance sheets as a result of the transfer not meeting the conditions for sale accounting: (a) $12.0 million , (b) $41.3 million , (c) $5.0 million , (d) $7.4 million , (e) $36.3 million , (f) $14.5 million , (g) $14.6 million , (h) $14.1 million , (i) $5.1 million and (j) $10.0 million . (3) 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. (4) These loans were repaid in March 2016. (5) These loans were collateralized by defeasance securities. (6) In, April 2016, the maturity date was extended to October 2016. (7) In March 2016, the maturity date was extended to September 2016. (8) In March 2016, the mortgage was sold. (9) In January 2016, the loans were modified. In March 2016, the mortgage was sold. (10) In March 2016, we contributed the loan for a joint venture interest which is now accounted for under the equity method of accounting. It is included in unconsolidated joint ventures on the combined balance sheets. (11) These loans were repaid in February 2016.
Summary of preferred equity investments	As of March 31, 2016 and December 31, 2015 , we held the following preferred equity investments with an aggregate weighted average current yield of 7.79% at March 31, 2016 (in thousands): Type March 31, 2016 Future Funding Obligations March 31, 2016 Senior Financing March 31, 2016 Carrying Value (1) December 31, 2015 (1) Initial Mandatory Redemption Preferred equity $ — $ 71,486 $ 9,971 $ 9,967 March 2018 Preferred equity 5,003 59,966 32,810 32,209 November 2018 $ 5,003 $ 131,452 $ 42,781 $ 42,176 ____________________________________________________________________ (1) Carrying value is net of deferred origination fees.

Investments in Unconsolidated37

Investments in Unconsolidated Joint Ventures (Tables)	3 Months Ended
	Mar. 31, 2016
Equity Method Investments and Joint Ventures [Abstract]
Schedule of general information on joint ventures	The table below provides general information on each of our joint ventures as of March 31, 2016 : Property Partner Ownership Interest Economic Interest Approximate Square Feet Acquisition Date Acquisition Price (1) (in thousands) 100 Park Avenue Prudential Real Estate Investors 49.90% 49.90% 834,000 January 2000 $ 95,800 717 Fifth Avenue Jeff Sutton/Private Investor 10.92% 10.92% 119,500 September 2006 251,900 800 Third Avenue Private Investors 60.52% 60.52% 526,000 December 2006 285,000 1745 Broadway Ivanhoe Cambridge, Inc. 56.88% 56.88% 674,000 April 2007 520,000 Jericho Plaza (2) Onyx Equities/Private Investor 11.67% 11.67% 640,000 April 2007 210,000 11 West 34th Street Private Investor/ Jeff Sutton 30.00% 30.00% 17,150 December 2010 10,800 3 Columbus Circle (3) The Moinian Group 48.90% 48.90% 741,500 January 2011 500,000 280 Park Avenue Vornado Realty Trust 50.00% 50.00% 1,219,158 March 2011 400,000 1552-1560 Broadway (4) Jeff Sutton 50.00% 50.00% 35,897 August 2011 136,550 724 Fifth Avenue Jeff Sutton 50.00% 50.00% 65,040 January 2012 223,000 10 East 53rd Street Canadian Pension Plan Investment Board 55.00% 55.00% 354,300 February 2012 252,500 33 Beekman (5) Harel Insurance and Finance/TNG 33 LLC 45.90% 45.90% 163,500 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 (6) Private Investors 32.28% 32.28% 16,736 December 2012 75,000 650 Fifth Avenue (7) Jeff Sutton 50.00% 50.00% 32,324 November 2013 — 121 Greene Street Jeff Sutton 50.00% 50.00% 7,131 September 2014 27,400 175-225 Third Street Brooklyn, New York KCLW 3rd Street LLC/LIVWRK LLC 95.00% 95.00% — October 2014 74,600 55 West 46th Street Prudential Real Estate Investors 25.00% 25.00% 347,000 November 2014 295,000 Stonehenge Portfolio Various Various Various 2,046,733 Various 36,668 131-137 Spring Street Invesco Real Estate 20.00% 20.00% 68,342 August 2015 277,750 76 11th Avenue (8) Oxford/Vornado 33.33% 36.58% 764,000 March 2016 138,240 ____________________________________________________________________ (1) Acquisition price represents the actual or implied gross purchase price for the joint venture, which is not adjusted for subsequent acquisitions of additional interests. (2) Our ownership percentage was reduced in the first quarter of 2016, from 77.78% to 11.67% , upon completion of the restructuring of the joint venture. (3) As a result of the sale of a condominium interest in September 2012, Young & Rubicam, Inc., or Y&R, owns floors three through eight at the property. Because the joint venture has an option to repurchase these floors, the gain associated with this sale was deferred. (4) The purchase price represents only the purchase of the 1552 Broadway interest which comprised approximately 13,045 square feet. The joint venture also owns a long-term leasehold interest in the retail space and certain other spaces at 1560 Broadway, which is adjacent to 1552 Broadway. (5) The redevelopment project was substantially complete during the second quarter of 2015 and was conveyed to Pace University during the third quarter of 2015. In October 2015, we entered into an agreement to sell the property for $196.0 million . The transaction is expected to be completed in the first half of 2016, subject to customary closing conditions. (6) 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. (7) 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. (8) The joint venture owns two mezzanine notes secured by interests in the entity that owns 76 11th Avenue. The difference between our ownership interest and our economic interest results from our right to 50% of the total exit fee while each of our partners is entitled to receive 25% of the total exit fee. The following table summarizes the investments in unconsolidated joint ventures sold during the three months ended March 31, 2016 : Property Ownership Percentage Disposition Date Type of Sale Gross Asset Valuation (in thousands) (1) Gain on Sale (in thousands) (2) 1 Jericho Plaza (3) 66.11% February 2016 Office $ 95,200 $ 3,300 7 Renaissance Square 50.00% March 2016 Office $ 20,700 $ 4,200 EOP Denver 4.79% March 2016 Office $ 180,700 $ 2,800 ____________________________________________________________ (1) Represents implied gross valuation for the joint venture or sales price of the property. (2) Represents the Company's share of the gain. The gain on sale is net of $0.5 million employee compensation awards accrued in connection with the realization of these investment gains as a bonus to certain employees that were instrumental in realizing the gains on sale. (3) Our ownership percentage was reduced in the first quarter of 2016, from 77.78% to 11.67% , upon completion of the restructuring of the joint venture As of March 31, 2016 and December 31, 2015, the carrying value for acquisition, development and construction arrangements were as follows (in thousands): Loan Type March 31, 2016 December 31, 2015 Initial Maturity Date Mezzanine loan and preferred equity $ 100,000 $ 99,936 March 2017 Mezzanine loan (1) 45,774 45,942 February 2022 $ 145,774 $ 145,878 ____________________________________________________________________ (1) We have an option to convert our loan to an equity interest subject to certain conditions. We have determined that our option to convert the loan to equity is not a derivative financial instrument pursuant to GAAP.
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 March 31, 2016 and December 31, 2015 , respectively, are as follows (amounts in thousands): Property Maturity Date Interest Rate (1) March 31, 2016 December 31, 2015 Fixed Rate Debt: 280 Park Avenue June 2016 6.57 % $ 691,048 $ 692,963 1745 Broadway January 2017 5.68 % 340,000 340,000 521 Fifth Avenue November 2019 3.73 % 170,000 170,000 717 Fifth Avenue (2) July 2022 4.45 % 300,000 300,000 21 East 66th Street April 2023 3.60 % 12,000 12,000 717 Fifth Avenue (2) July 2024 9.00 % 328,704 325,704 3 Columbus Circle March 2025 3.61 % 350,000 350,000 800 Third Avenue February 2026 3.17 % 177,000 20,910 Stonehenge Portfolio (3) Various 4.20 % 421,351 430,627 7 Renaissance Square — 2,927 Total fixed rate debt $ 2,790,103 $ 2,645,131 Property Maturity Date Interest Rate (1) March 31, 2016 December 31, 2015 Floating Rate Debt: 1552 Broadway (4) April 2016 4.58 % 190,410 190,409 Other loan payable June 2016 1.32 % 30,000 30,000 650 Fifth Avenue (5) October 2016 3.92 % 65,000 65,000 175-225 Third Street December 2016 4.50 % 40,000 40,000 10 East 53rd Street February 2017 2.92 % 125,000 125,000 724 Fifth Avenue April 2017 2.84 % 275,000 275,000 33 Beekman (6) August 2017 3.17 % 73,457 73,518 55 West 46th Street (7) October 2017 2.72 % 151,536 150,000 Stonehenge Portfolio December 2017 3.50 % 10,500 10,500 Jericho Plaza (8) March 2018 5.28 % 75,000 163,750 121 Greene Street November 2019 1.92 % 15,000 15,000 11 West 34th Street January 2021 1.88 % 23,000 23,000 100 Park Avenue February 2021 2.18 % 360,000 360,000 131-137 Spring Street August 2020 1.97 % 141,000 141,000 21 East 66th Street June 2033 3.00 % 1,785 1,805 Total floating rate debt $ 1,576,688 $ 1,663,982 Total joint venture mortgages and other loans payable $ 4,366,791 $ 4,309,113 Deferred financing costs, net (47,136 ) (42,565 ) Total joint venture mortgages and other loans payable, net $ 4,319,655 $ 4,266,548 ____________________________________________________________________ (1) Effective weighted average interest rate for the three months ended March 31, 2016 , taking into account interest rate hedges in effect during the period. (2) These loans are comprised of a $300.0 million fixed rate mortgage loan and $290.0 million mezzanine loan. The mezzanine loan is subject to accretion based on the difference between contractual interest rate and contractual pay rate. (3) Amount is comprised of $13.3 million , $55.3 million , $34.9 million , $140.9 million , and $177.0 million in fixed-rate mortgages that mature in July 2016, June 2017, November 2017, August 2019, and June 2024, respectively. In April 2016, the maturity date on $13.3 million due to mature in July 2016, was extended to October 2016. (4) These loans are comprised of a $150.0 million mortgage loan and a $41.5 million mezzanine loan. As of March 31, 2016 , $0.6 million of the mortgage loan and $0.5 million of the mezzanine loan was unfunded. (5) This loan has a committed amount of $97.0 million , of which $32.0 million was unfunded as of March 31, 2016 . (6) 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. This property is currently under contract, and the sale is expected to be completed in the first half of 2016. (7) This loan has a committed amount of $190.0 million , of which $38.5 million was unfunded as of March 31, 2016 . (8) We hold an 11.67% non-controlling interest in the joint venture and the property secures a two year $100.0 million loan, of which $75.0 million is currently outstanding.
Schedule of combined balance sheets for the unconsolidated joint ventures	The combined balance sheets for the unconsolidated joint ventures, at March 31, 2016 and December 31, 2015 are as follows (in thousands): March 31, 2016 December 31, 2015 Assets Commercial real estate property, net $ 5,998,692 $ 6,122,468 Debt and preferred equity investments, net 284,014 145,878 Other assets 673,317 715,840 Total assets $ 6,956,023 $ 6,984,186 Liabilities and members' equity Mortgages and other loans payable, net $ 4,319,655 $ 4,266,548 Other liabilities 523,359 523,160 Members' equity 2,113,009 2,194,478 Total liabilities and members' equity $ 6,956,023 $ 6,984,186 Company's investments in unconsolidated joint ventures $ 1,146,085 $ 1,203,858
Schedule of combined statements of income for the unconsolidated joint ventures	The combined statements of operations for the unconsolidated joint ventures, from acquisition date through the three months ended March 31, 2016 and 2015 , are as follows (in thousands): Three Months Ended March 31, 2016 2015 Total revenues $ 162,512 $ 128,916 Operating expenses 27,254 25,486 Ground rent 3,211 2,592 Real estate taxes 24,210 19,376 Interest expense, net of interest income 49,736 44,007 Amortization of deferred financing costs 3,236 3,010 Transaction related costs — 8 Depreciation and amortization 37,851 32,984 Total expenses 145,498 127,463 Loss on early extinguishment of debt (1,606 ) (833 ) Net income before gain on sale $ 15,408 $ 620 Company's equity in net income from unconsolidated joint ventures $ 10,096 $ 4,030

Deferred Costs (Tables)

Deferred Costs (Tables)	3 Months Ended
	Mar. 31, 2016
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Schedule of components of deferred costs	Deferred costs at March 31, 2016 and December 31, 2015 consisted of the following (in thousands): March 31, 2016 December 31, 2015 Deferred leasing $ 431,033 $ 415,406 Less: accumulated amortization (184,530 ) (175,486 ) Deferred costs, net $ 246,503 $ 239,920

Mortgages and Other Loans Pay39

Mortgages and Other Loans Payable (Tables)	3 Months Ended
	Mar. 31, 2016
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 March 31, 2016 and December 31, 2015 , respectively, were as follows (amounts in thousands): Property Maturity Date Interest Rate (1) March 31, 2016 December 31, 2015 Fixed Rate Debt: Landmark Square December 2016 4.00 % $ 79,124 $ 79,562 FHLB Facility (2) Various Various 205,000 — 485 Lexington Avenue February 2017 5.61 % 450,000 450,000 762 Madison Avenue February 2017 3.86 % 7,828 7,872 885 Third Avenue (3) 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 % 536,848 542,817 100 Church Street July 2022 4.68 % 224,188 225,099 919 Third Avenue (5) June 2023 5.12 % 500,000 500,000 400 East 57th Street February 2024 4.13 % 67,323 67,644 400 East 58th Street February 2024 4.13 % 28,852 28,990 420 Lexington Avenue October 2024 3.99 % 300,000 300,000 1515 Broadway March 2025 3.93 % 900,000 900,000 11 Madison Avenue September 2025 3.84 % 1,400,000 1,400,000 Series J Preferred Units (6) April 2051 3.75 % 4,000 4,000 500 West Putnam Avenue (7) — 22,376 Total fixed rate debt $ 5,990,813 $ 5,816,010 Floating Rate Debt: Master Repurchase Agreement June 2016 4.00 % 185,898 253,424 FHLB Facility (2) Various Various 45,750 45,750 600 Lexington Avenue October 2017 2.56 % 111,822 112,795 187 Broadway & 5-7 Dey Street October 2017 3.05 % 40,000 40,000 719 Seventh Avenue February 2018 3.49 % 22,892 — 388-390 Greenwich Street (4) June 2018 2.16 % 446,000 446,000 1080 Amsterdam November 2018 4.18 % 3,525 3,525 220 East 42nd Street October 2020 2.02 % 275,000 275,000 248-252 Bedford Avenue (8) — 29,000 Total floating rate debt $ 1,130,887 $ 1,205,494 Total fixed rate and floating rate debt $ 7,121,700 $ 7,021,504 Mortgages reclassed to liabilities related to assets held for sale (4)(8) (1,450,000 ) (29,000 ) Total mortgages and other loans payable $ 5,671,700 $ 6,992,504 Deferred financing costs, net of amortization (86,529 ) $ (110,584 ) Total mortgages and other loans payable, net $ 5,585,171 $ 6,881,920 ____________________________________________________________________ (1) Effective weighted average interest rate for the quarter ended March 31, 2016 , taking into account interest rate hedges in effect during the period. (2) The FHLB Facility is comprised of two fixed rate advances of $105.0 million and $100.0 million that both mature in January 2017 and four variable rate advances of $1.0 million , $15.8 million , $5.0 million and $24.0 million that mature in April 2016, April 2016, June 2016 and December 2016, respectively. The weighted average interest rates on these advances range from 0.69% to 1.03% . The $1.0 million , and $15.8 million advances were repaid in April 2016. (3) In February 2016, we closed on the sale of 885 Third Avenue. The sale did not meet the criteria for sale accounting and as a result the property remains on our consolidated balance sheet until the criteria is met. (4) This property was held for sale at March 31, 2016 and the related mortgage, net of deferred financing costs, net of amortization of $24.5 million , is included in liabilities related to assets held for sale. (5) We own a 51.0% controlling interest in the consolidated 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 , 3.75% Series J Preferred Units of limited partnership interest, or the Series J Preferred Units, with a mandatory liquidation preference of $1,000.00 per unit. The Series J Preferred Units are accounted for as debt because they can be redeemed in cash by the Operating Partnership on the earlier of (i) the date of the sale of the property or (ii) April 30, 2051 or at the option of the unitholders as provided for in the related agreement. (7) In January 2016, the mortgage was repaid. (8) The property at 248-252 Bedford Avenue in Brooklyn, New York was sold in February 2016. All obligations related to the property accruing on and after closing were assumed by the purchaser. At December 31, 2015 this property was held for sale and the related mortgage, net of deferred financing, net of amortization costs of $0.9 million , was included in liabilities related to assets held for sale.

Corporate Indebtedness (Tables)

Corporate Indebtedness (Tables)	3 Months Ended
	Mar. 31, 2016
Debt Disclosure [Abstract]
Schedule of senior unsecured notes and other related disclosures by scheduled maturity date	The following table sets forth our senior unsecured notes and other related disclosures as of March 31, 2016 and December 31, 2015 , respectively, by scheduled maturity date (dollars in thousands): Issuance March 31, 2016 Unpaid Principal Balance March 31, 2016 Accreted Balance December 31, 2015 Accreted Balance Coupon Rate (1) Effective Rate Term (in Years) Maturity Date October 12, 2010 (2) $ 345,000 $ 324,281 $ 321,130 3.00 % 6.65 % 7 October 15, 2017 August 5, 2011 (3) 250,000 249,827 249,810 5.00 % 5.03 % 7 August 15, 2018 March 16, 2010 (3) 250,000 250,000 250,000 7.75 % 7.75 % 10 March 15, 2020 November 15, 2012 (3) 200,000 200,000 200,000 4.50 % 4.50 % 10 December 1, 2022 December 17, 2015 (3) 100,000 100,000 100,000 4.27 % 4.27 % 10 December 17, 2025 March 26, 2007 (4) 10,008 10,008 10,008 3.00 % 3.00 % 20 March 30, 2027 March 31, 2006 (5) — — 255,296 $ 1,155,008 $ 1,134,116 $ 1,386,244 Deferred financing costs, net $ (7,257 ) $ (7,280 ) $ 1,155,008 $ 1,126,859 $ 1,378,964 ____________________________________________________________________ (1) Interest on the senior unsecured notes is payable semi-annually with principal and unpaid interest due on the scheduled maturity dates. (2) Issued by the Operating Partnership. Interest on these exchangeable notes is payable semi-annually on April 15 and October 15. The notes had an initial exchange rate representing an exchange price that was set at a 30.0% premium to the last reported sale price of SL Green's common stock on October 6, 2010, or $85.81 . The initial exchange rate is subject to adjustment under certain circumstances. The current exchange rate is 12.4230 shares of SL Green's common stock per $1,000 principal amount of these notes. The notes are senior unsecured obligations of the Operating Partnership and are exchangeable upon the occurrence of specified events and during the period beginning on the twenty-second scheduled trading day prior to the maturity date and ending on the second business day prior to the maturity date, into cash or a combination of cash and shares of SL Green's common stock, if any, at our option. As a result of meeting specified events (as defined in the Indenture Agreement), these notes became exchangeable commencing January 1, 2016 and remained exchangeable through March 31, 2016. The notes are guaranteed by ROP. On the issuance date, $78.3 million of the debt balance was recorded in equity. As of March 31, 2016 , $20.7 million remained to be amortized into the debt balance. (3) Issued by the Company, the Operating Partnership and ROP, as co-obligors. (4) Issued by the Operating Partnership. Interest on these remaining exchangeable notes is payable semi-annually on March 30 and September 30. The notes have an initial exchange rate representing an exchange price that was set at a 25.0% premium to the last reported sale price of the Company's common stock on March 20, 2007, or $173.30 . The initial exchange rate is subject to adjustment under certain circumstances. The current exchange rate is 5.7974 shares of SL Green's common stock per $1,000 principal amount of these notes. The notes are senior unsecured obligations of the Operating Partnership and are exchangeable upon the occurrence of specified events and during the period beginning on the twenty-second scheduled trading day prior to the maturity date and ending on the second business day prior to the maturity date, into cash or a combination of cash and shares of SL Green's common stock, if any, at our option. The notes are currently redeemable at the Operating Partnership’s option. The Operating Partnership may be required to repurchase the notes on March 30, 2017 and 2022, and upon the occurrence of certain designated events. (5) Issued by ROP, balance was repaid in March 2016.
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 March 31, 2016 , including as-of-right extension options and put options, were as follows (in thousands): Scheduled Amortization Principal Revolving Credit Facility Unsecured Term Loan Trust Preferred Securities Senior Unsecured Notes Total Joint Venture Debt Remaining 2016 $ 42,226 $ 309,584 $ — $ — $ — $ — $ 351,810 $ 526,982 2017 63,643 1,076,548 — — — 355,008 1,495,199 591,284 2018 64,119 42,417 — — — 250,000 356,536 447 2019 70,255 — — 933,000 — — 1,003,255 104,687 2020 52,799 679,531 775,000 — — 250,000 1,757,330 30,298 Thereafter 147,604 4,572,974 — — 100,000 300,000 5,120,578 451,544 $ 440,646 $ 6,681,054 $ 775,000 $ 933,000 $ 100,000 $ 1,155,008 $ 10,084,708 $ 1,705,242
Schedule of consolidated interest expense, excluding capitalized interest	Consolidated interest expense, excluding capitalized interest, was comprised of the following (in thousands): Three Months Ended March 31, 2016 2015 Interest expense $ 102,155 $ 85,017 Interest capitalized (6,618 ) (8,558 ) Interest income (865 ) (652 ) Interest expense, net $ 94,672 $ 75,807

Related Party Transactions (Tab

Related Party Transactions (Tables)	3 Months Ended
	Mar. 31, 2016
Related Party Transactions [Abstract]
Schedule of amounts due from/to related parties	Amounts due from related parties at March 31, 2016 and December 31, 2015 consisted of the following (in thousands): March 31, 2016 December 31, 2015 Due from joint ventures $ 2,005 $ 1,334 Other 13,143 9,316 Related party receivables $ 15,148 $ 10,650

Noncontrolling Interests on t42

Noncontrolling Interests on the Company's Consolidated Financial Statements (Tables)	3 Months Ended
	Mar. 31, 2016
Noncontrolling Interest [Abstract]
Schedule of Noncontrolling Interest	Below is the rollforward analysis of the activity relating to the noncontrolling interests in the Operating Partnership as of March 31, 2016 and December 31, 2015 (in thousands): March 31, 2016 December 31, 2015 Balance at beginning of period $ 424,206 $ 469,524 Distributions (2,881 ) (9,710 ) Issuance of common units 18,140 30,506 Redemption of common units (7,152 ) (55,697 ) Net income 922 10,565 Accumulated other comprehensive income allocation (322 ) (67 ) Fair value adjustment (25,867 ) (20,915 ) Balance at end of period $ 407,046 $ 424,206
Schedule of Preferred Unit Activity	Below is the rollforward analysis of the activity relating to the preferred units in the Operating Partnership as of March 31, 2016 and December 31, 2015 (in thousands): March 31, 2016 December 31, 2015 Balance at beginning of period $ 282,516 $ 71,115 Issuance of preferred units 22,793 211,601 Redemption of preferred units (440 ) (200 ) Balance at end of period $ 304,869 $ 282,516

Stockholders' Equity of the C43

Stockholders' Equity of the Company (Tables)	3 Months Ended
	Mar. 31, 2016
Stockholders' Equity Note [Abstract]
Schedule of Earnings Per Share	SL Green's earnings per share for the three months ended March 31, 2016 and 2015 are computed as follows (in thousands): Three Months Ended March 31, Numerator 2016 2015 Basic Earnings: Income attributable to SL Green common stockholders $ 23,221 $ 43,277 Effect of Dilutive Securities: Redemption of units to common shares 922 1,743 Diluted Earnings: Income attributable to SL Green common stockholders $ 24,143 $ 45,020 Three Months Ended March 31, Denominator 2016 2015 Basic Shares: Weighted average common stock outstanding 100,051 98,402 Effect of Dilutive Securities: Operating Partnership units redeemable for common shares 3,974 3,964 Stock-based compensation plans 234 653 Diluted weighted average common stock outstanding 104,259 103,019

Partners' Capital of the Oper44

Partners' Capital of the Operating Partnership (Tables)	3 Months Ended
	Mar. 31, 2016
Equity [Abstract]
Schedule of calculation of numerator and denominator in earnings per unit	The Operating Partnership's earnings per unit for the three months ended March 31, 2016 and 2015 , respectively are computed as follows (in thousands): Three months ended March 31, Numerator 2016 2015 Basic and Diluted Earnings: Income attributable to SLGOP common unitholders $ 24,143 $ 45,020 Three months ended March 31, Denominator 2016 2015 Basic units: Weighted average common units outstanding 104,025 102,366 Effect of Dilutive Securities: Stock-based compensation plans 234 653 Diluted weighted average common units outstanding 104,259 103,019

Share-based Compensation (Table

Share-based Compensation (Tables)	3 Months Ended
	Mar. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of weighted average assumptions used to estimate the grant date fair value of options granted	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 three months ended March 31, 2016 and the year ended December 31, 2015 . March 31, 2016 December 31, 2015 Dividend yield 2.30 % 1.97 % Expected life of option 3.5 years 3.6 years Risk-free interest rate 1.27 % 1.43 % Expected stock price volatility 31.00 % 32.34 %
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 March 31, 2016 and December 31, 2015 , and changes during the three months ended March 31, 2016 and year ended December 31, 2015 are as follows: March 31, 2016 December 31, 2015 Options Outstanding Weighted Average Exercise Price Options Outstanding Weighted Average Exercise Price Balance at beginning of period $ 1,595,007 $ 95.52 $ 1,462,726 $ 87.98 Granted 4,500 94.75 389,836 112.54 Exercised (17,250 ) 72.41 (217,438 ) 74.69 Lapsed or cancelled (15,800 ) 113.59 (40,117 ) 98.61 Balance at end of period $ 1,566,457 $ 95.59 $ 1,595,007 $ 95.52 Options exercisable at end of period 921,240 $ 88.23 589,055 $ 89.85 Weighted average fair value of options granted during the period $ 84,531 $ 9,522,613
Summary of restricted stock and charges during the period	A summary of the Company's restricted stock as of March 31, 2016 and December 31, 2015 and charges during the three months ended March 31, 2016 and the year ended December 31, 2015 , are as follows: March 31, 2016 December 31, 2015 Balance at beginning of period 3,137,881 3,000,979 Granted 1,000 143,053 Cancelled (4,600 ) (6,151 ) Balance at end of period 3,134,281 3,137,881 Vested during the period 81,172 87,081 Compensation expense recorded $ 2,016,554 $ 7,540,747 Weighted average fair value of restricted stock granted during the period $ 93,840 $ 16,061,201

Accumulated Other Comprehensi46

Accumulated Other Comprehensive Loss(Tables)	3 Months Ended
	Mar. 31, 2016
SL Green Realty Corp
Accumulated Other Comprehensive Income (Loss) [Line Items]
Schedule of Accumulated Other Comprehensive Income (Loss)	The following tables set forth the changes in accumulated other comprehensive income (loss) by component as of March 31, 2016 (in thousands): Net unrealized (loss) gain on derivative instruments ( 1 ) SL Green’s share of joint venture net unrealized (loss) gain on derivative instruments ( 2 ) Unrealized gain (loss) on marketable securities Total Balance at December 31, 2015 $ (10,160 ) $ (592 ) $ 2,003 $ (8,749 ) Other comprehensive loss before reclassifications (6,651 ) (2,658 ) (1,194 ) (10,503 ) Amounts reclassified from accumulated other comprehensive income 2,080 (50 ) — 2,030 Balance at March 31, 2016 $ (14,731 ) $ (3,300 ) $ 809 $ (17,222 ) ____________________________________________________________________ (1) Amount reclassified from accumulated other comprehensive income (loss) is included in interest expense in the respective consolidated statements of operations. As of March 31, 2016 and December 31, 2015 , the deferred net losses from these terminated hedges, which is included in accumulated other comprehensive loss relating to net unrealized loss on derivative instrument, was $9.2 million and $9.7 million , respectively. (2) Amount reclassified from accumulated other comprehensive income (loss) is included in equity in net income from unconsolidated joint ventures in the respective consolidated statements of operations.

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2016
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 March 31, 2016 and December 31, 2015 (in thousands): March 31, 2016 Total Level 1 Level 2 Level 3 Assets: Marketable securities $ 43,915 $ 4,132 $ 39,783 $ — Interest rate cap and swap agreements (included in other assets) $ 6 $ — $ 6 $ — Liabilities: Interest rate cap and swap agreements (included in accrued interest payable and other liabilities) $ 2,600 $ — $ 2,600 $ — Interest rate cap and swap agreements (included in liabilities related to assets held for sale) $ 12,077 $ — $ 12,077 $ — December 31, 2015 Total Level 1 Level 2 Level 3 Assets: Marketable securities $ 45,138 $ 4,704 $ 40,434 $ — Interest rate cap and swap agreements (included in other assets) $ 204 $ — $ 204 $ — Liabilities: Interest rate cap and swap agreements (included in accrued interest payable and other liabilities) $ 10,776 $ — $ 10,776 $ —
Fair Value, by Balance Sheet Grouping	The following table provides the carrying value and fair value of these financial instruments as of March 31, 2016 and December 31, 2015 (in thousands): March 31, 2016 December 31, 2015 Carrying Value Fair Value Carrying Value Fair Value Debt and preferred equity investments $ 1,378,616 (1) $ 1,670,020 (1) Fixed rate debt (2) $ 7,154,930 $ 7,507,340 $ 7,232,254 $ 7,591,388 Variable rate debt (2) 2,908,887 2,905,459 3,202,494 3,179,186 $ 10,063,817 $ 10,412,799 $ 10,434,748 $ 10,770,574 ____________________________________________________________________ (1) At March 31, 2016 , debt and preferred equity investments had an estimated fair value ranging between $1.4 billion and $1.5 billion . At December 31, 2015, debt and preferred equity investments had an estimated fair value ranging between $1.7 billion and $1.8 billion . (2) Includes the $1.0 billion fixed rate mortgage and $446.0 million variable rate mortgage at 388-390 Greenwich Street that is included in liabilities related to assets held for sale on the consolidated balance sheet at March 31, 2016.

Financial Instruments_ Deriva48

Financial Instruments: Derivatives and Hedging (Tables)	3 Months Ended
	Mar. 31, 2016
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 value at inception and fair value of our consolidated derivative financial instruments at March 31, 2016 based on Level 2 information. The notional value is an indication of the extent of our involvement in these instruments at that time, but does not represent exposure to credit, interest rate or market risks (amounts in thousands). Notional Value Strike Rate Effective Date Expiration Date Balance Sheet Location Fair Value Interest Rate Cap - Sold $ 504,000 4.750 % May 2014 May 2016 Other Liabilities $ — Interest Rate Cap - Sold 500,000 4.750 % November 2014 May 2016 Other Liabilities — Interest Rate Cap 117,392 6.000 % October 2014 October 2016 Other Liabilities — Interest Rate Swap 200,000 0.938 % October 2014 December 2017 Other Liabilities (985 ) Interest Rate Swap 150,000 0.940 % October 2014 December 2017 Other Liabilities (743 ) Interest Rate Swap 150,000 0.940 % October 2014 December 2017 Other Liabilities (743 ) Interest Rate Swap 30,000 2.295 % July 2010 June 2016 Other Liabilities (109 ) Interest Rate Swap 14,409 0.500 % January 2015 January 2017 Other Assets 5 Interest Rate Swap 8,018 0.852 % February 2015 February 2017 Other Liabilities (20 ) Interest Rate Cap 137,500 4.000 % September 2015 September 2017 Other Assets 1 $ (2,594 ) Financial Instruments related to assets held for sale: Interest Rate Cap $ 504,000 4.750 % May 2014 May 2016 Other Liabilities $ — Interest Rate Cap 500,000 4.750 % October 2014 May 2016 Other Liabilities — Interest Rate Cap 446,000 4.750 % October 2014 May 2016 Other Liabilities — Interest Rate Swap 144,000 2.236 % December 2012 December 2017 Other Liabilities (3,902 ) Interest Rate Swap 86,400 1.948 % December 2012 December 2017 Other Liabilities (1,916 ) Interest Rate Swap 72,000 2.310 % December 2012 December 2017 Other Liabilities (2,042 ) Interest Rate Swap 72,000 1.345 % December 2012 December 2017 Other Liabilities (856 ) Interest Rate Swap 72,000 2.310 % December 2012 December 2017 Other Liabilities (2,042 ) Interest Rate Swap 57,600 1.990 % December 2012 December 2017 Other Liabilities (1,319 ) $ (12,077 ) Total $ (14,671 )
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 March 31, 2016 and 2015 , respectively (in thousands): Amount of (Loss) Gain Recognized in Other Comprehensive Loss (Effective Portion) Location of (Loss) Reclassified from Accumulated Other Comprehensive Loss into Income Amount of Loss Reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion) Location of (Loss) or Gain Recognized in Income on Derivative Amount of (Loss) or Gain Recognized into Income (Ineffective Portion) Three months ended March 31 Three months ended March 31 Three months ended March 31 Derivative 2016 2015 2016 2015 2016 2015 Interest Rate Swaps/Caps $ (6,919 ) $ (7,521 ) Interest expense $ 2,163 $ 2,747 Interest expense $ (39 ) $ (410 ) Share of unconsolidated joint ventures' derivative instruments (2,765 ) (1,237 ) Equity in net income from unconsolidated joint ventures 351 331 Equity in net income from unconsolidated joint ventures (436 ) (16 ) $ (9,684 ) $ (8,758 ) $ 2,514 $ 3,078 $ (475 ) $ (426 )

Commitments and Contingencies (

Commitments and Contingencies (Tables)	3 Months Ended
	Mar. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Schedule of Future Minimum Rental Payments for Operating Leases	The following is a schedule of future minimum lease payments under capital leases and non-cancellable operating leases with initial terms in excess of one year as of March 31, 2016 (in thousands): Capital lease Non-cancellable operating leases Remaining 2016 $ 1,705 $ 23,142 2017 2,387 31,049 2018 2,387 31,049 2019 2,411 31,066 2020 2,620 31,436 Thereafter 825,483 764,352 Total minimum lease payments 836,993 $ 912,094 Amount representing interest (795,439 ) Capital lease obligations $ 41,554
Schedule of Future Minimum Lease Payments for Capital Leases	The following is a schedule of future minimum lease payments under capital leases and non-cancellable operating leases with initial terms in excess of one year as of March 31, 2016 (in thousands): Capital lease Non-cancellable operating leases Remaining 2016 $ 1,705 $ 23,142 2017 2,387 31,049 2018 2,387 31,049 2019 2,411 31,066 2020 2,620 31,436 Thereafter 825,483 764,352 Total minimum lease payments 836,993 $ 912,094 Amount representing interest (795,439 ) Capital lease obligations $ 41,554

Segment Information (Tables)

Segment Information (Tables)	3 Months Ended
	Mar. 31, 2016
Segment Reporting [Abstract]
Schedule of selected results of operations and selected asset information	Selected results of operations for the three months ended March 31, 2016 and 2015 , and selected asset information as of March 31, 2016 and December 31, 2015 , regarding our operating segments are as follows (in thousands): Real Estate Segment Debt and Preferred Equity Segment Total Company Total revenues Three months ended: March 31, 2016 $ 400,707 $ 54,737 $ 455,444 March 31, 2015 354,230 42,069 396,299 Income from continuing operations before equity in net gain on sale of interest in unconsolidated joint venture/real estate and gain on sale of real estate Three months ended: March 31, 2016 $ (39,031 ) $ 47,846 $ 8,815 March 31, 2015 6,759 35,467 42,226 Total assets As of: March 31, 2016 $ 18,195,830 $ 1,390,138 $ 19,585,968 December 31, 2015 18,045,370 1,682,276 19,727,646
Schedule of reconciliation of income from continuing operations to net income attributable to SL Green common stockholders	The table below reconciles income from continuing operations to net income for the three months ended March 31, 2016 , and 2015 (in thousands): Three months ended March 31, 2016 2015 Income from continuing operations before equity in net gain on sale of interest in unconsolidated joint venture/real estate and gain on sale of real estate $ 8,815 $ 42,226 Equity in net gain on sale of interest in unconsolidated joint venture/real estate 9,915 — Gain on sale of real estate 13,773 — Income from continuing operations 32,503 42,226 Net income from discontinued operations — 427 Gain on sale of discontinued operations — 12,983 Net income $ 32,503 $ 55,636

Organization and Basis of Pre51

Organization and Basis of Presentation (Details) - SL Green Operating Partnership	3 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Organization
Percentage of ownership in SL Green Management LLC owned by operating partnership (percent)	100.00%
Noncontrolling interest in the operating partnership (as a percent)	3.84%	3.61%
Service Corporation
Organization
Economic interest in variable interest entity (as a percent)	95.00%

Organization and Basis of Pre52

Organization and Basis of Presentation (Schedule of Commercial Office Properties)(Details) $ in Thousands	3 Months Ended
	Mar. 31, 2016USD ($)ft²buildingshares	Dec. 31, 2015USD ($)
Real estate properties
Number of Properties | building	111
Approximate Square Feet unaudited (sqft)	34,850,908
Weighted Average Occupancy unaudited (as a percent)	92.30%
Debt and preferred equity investments | $	$ 1,378,616	$ 1,670,020
Number of shares to be received on redemption of one unit of limited partnership interests (shares) | shares	1
Debt and preferred equity investments including investments held by unconsolidated joint ventures | $	$ 1,700,000
Debt and preferred equity investments and other financing receivables included in other balance sheet items | $	$ 300,000
Commercial properties
Real estate properties
Number of Properties | building	90
Approximate Square Feet unaudited (sqft)	31,894,897
Weighted Average Occupancy unaudited (as a percent)	92.00%
Residential
Real estate properties
Number of Properties | building	21
Approximate Square Feet unaudited (sqft)	2,956,011
Weighted Average Occupancy unaudited (as a percent)	95.40%
Managed office properties
Real estate properties
Approximate Square Feet unaudited (sqft)	336,000
Consolidated properties
Real estate properties
Number of Properties | building	73
Approximate Square Feet unaudited (sqft)	26,691,751
Consolidated properties | Commercial properties
Real estate properties
Number of Properties | building	69
Approximate Square Feet unaudited (sqft)	25,929,164
Consolidated properties | Residential
Real estate properties
Number of Properties | building	4
Approximate Square Feet unaudited (sqft)	762,587
Unconsolidated properties
Real estate properties
Number of Properties | building	38
Approximate Square Feet unaudited (sqft)	8,159,157
Unconsolidated properties | Commercial properties
Real estate properties
Number of Properties | building	21
Approximate Square Feet unaudited (sqft)	5,965,733
Unconsolidated properties | Residential
Real estate properties
Number of Properties | building	17
Approximate Square Feet unaudited (sqft)	2,193,424
Manhattan
Real estate properties
Number of Properties | building	59
Approximate Square Feet unaudited (sqft)	26,966,597
Weighted Average Occupancy unaudited (as a percent)	93.80%
Manhattan | Office
Real estate properties
Number of Properties | building	33
Approximate Square Feet unaudited (sqft)	25,247,745
Weighted Average Occupancy unaudited (as a percent)	95.90%
Manhattan | Retail
Real estate properties
Number of Properties | building	19
Approximate Square Feet unaudited (sqft)	766,063
Weighted Average Occupancy unaudited (as a percent)	88.10%
Manhattan | Development/Redevelopment
Real estate properties
Number of Properties | building	6
Approximate Square Feet unaudited (sqft)	776,259
Weighted Average Occupancy unaudited (as a percent)	30.50%
Manhattan | Fee Interest
Real estate properties
Number of Properties | building	1
Approximate Square Feet unaudited (sqft)	176,530
Weighted Average Occupancy unaudited (as a percent)	100.00%
Manhattan | Residential
Real estate properties
Number of Properties | building	21
Approximate Square Feet unaudited (sqft)	2,956,011
Weighted Average Occupancy unaudited (as a percent)	95.40%
Manhattan | Consolidated properties
Real estate properties
Number of Properties | building	41
Approximate Square Feet unaudited (sqft)	21,640,864
Manhattan | Consolidated properties | Office
Real estate properties
Number of Properties | building	27
Approximate Square Feet unaudited (sqft)	21,003,606
Manhattan | Consolidated properties | Retail
Real estate properties
Number of Properties | building	10
Approximate Square Feet unaudited (sqft)	418,093
Manhattan | Consolidated properties | Development/Redevelopment
Real estate properties
Number of Properties | building	3
Approximate Square Feet unaudited (sqft)	42,635
Manhattan | Consolidated properties | Fee Interest
Real estate properties
Number of Properties | building	1
Approximate Square Feet unaudited (sqft)	176,530
Manhattan | Consolidated properties | Residential
Real estate properties
Number of Properties | building	4
Approximate Square Feet unaudited (sqft)	762,587
Manhattan | Consolidated properties | Dual property type, retail portion
Real estate properties
Approximate Square Feet unaudited (sqft)	270,132
Manhattan | Consolidated properties | Dual property type, residential portion
Real estate properties
Approximate Square Feet unaudited (sqft)	222,855
Manhattan | Unconsolidated properties
Real estate properties
Number of Properties | building	18
Approximate Square Feet unaudited (sqft)	5,325,733
Manhattan | Unconsolidated properties | Office
Real estate properties
Number of Properties | building	6
Approximate Square Feet unaudited (sqft)	4,244,139
Manhattan | Unconsolidated properties | Retail
Real estate properties
Number of Properties | building	9
Approximate Square Feet unaudited (sqft)	347,970
Manhattan | Unconsolidated properties | Development/Redevelopment
Real estate properties
Number of Properties | building	3
Approximate Square Feet unaudited (sqft)	733,624
Manhattan | Unconsolidated properties | Fee Interest
Real estate properties
Number of Properties | building	0
Approximate Square Feet unaudited (sqft)	0
Manhattan | Unconsolidated properties | Residential
Real estate properties
Number of Properties | building	17
Approximate Square Feet unaudited (sqft)	2,193,424
Suburban
Real estate properties
Number of Properties | building	31
Approximate Square Feet unaudited (sqft)	4,928,300
Weighted Average Occupancy unaudited (as a percent)	81.90%
Suburban | Office
Real estate properties
Number of Properties | building	28
Approximate Square Feet unaudited (sqft)	4,875,300
Weighted Average Occupancy unaudited (as a percent)	81.70%
Suburban | Retail
Real estate properties
Number of Properties | building	1
Approximate Square Feet unaudited (sqft)	52,000
Weighted Average Occupancy unaudited (as a percent)	100.00%
Suburban | Development/Redevelopment
Real estate properties
Number of Properties | building	2
Approximate Square Feet unaudited (sqft)	1,000
Weighted Average Occupancy unaudited (as a percent)	100.00%
Suburban | Residential
Real estate properties
Number of Properties | building	0
Approximate Square Feet unaudited (sqft)	0
Weighted Average Occupancy unaudited (as a percent)	0.00%
Suburban | Consolidated properties
Real estate properties
Number of Properties | building	28
Approximate Square Feet unaudited (sqft)	4,288,300
Suburban | Consolidated properties | Office
Real estate properties
Number of Properties | building	26
Approximate Square Feet unaudited (sqft)	4,235,300
Suburban | Consolidated properties | Retail
Real estate properties
Number of Properties | building	1
Approximate Square Feet unaudited (sqft)	52,000
Suburban | Consolidated properties | Development/Redevelopment
Real estate properties
Number of Properties | building	1
Approximate Square Feet unaudited (sqft)	1,000
Suburban | Consolidated properties | Residential
Real estate properties
Number of Properties | building	0
Approximate Square Feet unaudited (sqft)	0
Suburban | Unconsolidated properties
Real estate properties
Number of Properties | building	3
Approximate Square Feet unaudited (sqft)	640,000
Suburban | Unconsolidated properties | Office
Real estate properties
Number of Properties | building	2
Approximate Square Feet unaudited (sqft)	640,000
Suburban | Unconsolidated properties | Retail
Real estate properties
Number of Properties | building	0
Approximate Square Feet unaudited (sqft)	0
Suburban | Unconsolidated properties | Development/Redevelopment
Real estate properties
Number of Properties | building	1
Approximate Square Feet unaudited (sqft)	0
Suburban | Unconsolidated properties | Residential
Real estate properties
Number of Properties | building	0
Approximate Square Feet unaudited (sqft)	0

Significant Accounting Polici53

Significant Accounting Policies (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Principles of Consolidation
Commercial real estate properties	$ 12,828,941	$ 14,620,896
Mortgages and other loans payable, net	5,585,171	6,881,920
Consolidated VIEs
Principles of Consolidation
Commercial real estate properties	1,800,000	200,700
Mortgages and other loans payable, net	$ 673,900	$ 104,500

Significant Accounting Polici54

Significant Accounting Policies (Investments in Commercial Real Estate Properties)(Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Investment in Commercial Real Estate Properties
Increase in rental revenue from amortization of acquired leases	$ 34,800	$ 14,300
Reduction in interest expense from amortization of above-market rate mortgages	600	$ 600
Identified intangible assets (included in other assets):
Gross amount	1,022,698		$ 939,518
Accumulated amortization	(407,401)		(403,747)
Net	615,297		535,771
Identified intangible liabilities (included in deferred revenue):
Gross amount	863,882		866,561
Accumulated amortization	(489,674)		(486,928)
Net	374,208		379,633
Net intangible assets reclassed to assets held for sale	242,800		149,900
Net intangible liabilities reclassed to liabilities relates to assets held for sale	$ 200		$ 100
Minimum | Above-market leases
Investment in Commercial Real Estate Properties
Estimated useful life of other intangible assets (in years)	1 year
Minimum | Below-market leases
Investment in Commercial Real Estate Properties
Estimated useful life of other intangible assets (in years)	1 year
Minimum | In-place leases
Investment in Commercial Real Estate Properties
Estimated useful life of other intangible assets (in years)	1 year
Maximum | Above-market leases
Investment in Commercial Real Estate Properties
Estimated useful life of other intangible assets (in years)	14 years
Maximum | Below-market leases
Investment in Commercial Real Estate Properties
Estimated useful life of other intangible assets (in years)	14 years
Maximum | In-place leases
Investment in Commercial Real Estate Properties
Estimated useful life of other intangible assets (in years)	14 years
Building | Minimum
Investment in Commercial Real Estate Properties
Estimated useful life (in years)	3 years
Building | Maximum
Investment in Commercial Real Estate Properties
Estimated useful life (in years)	40 years

Significant Accounting Polici55

Significant Accounting Policies (Investment in Marketable Securities)(Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Mar. 31, 2016
Investment in Marketable Securities
Marketable securities	$ 45,138	$ 43,915
Cost basis	38,700	38,700
Proceeds from sale of marketable securities	100
Fair Value
Investment in Marketable Securities
Marketable securities	45,138	43,915
Equity marketable securities
Investment in Marketable Securities
Marketable securities	4,704	4,132
Commercial mortgage-backed securities
Investment in Marketable Securities
Marketable securities	$ 40,434	$ 39,783

Significant Accounting Polici56

Significant Accounting Policies (Revenue Recognition/Income Taxes)(Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Accounting Policies [Abstract]
Days past due for income recognition on debt and preferred equity investments to be suspended	90 days
Income taxes
Federal, state and local tax provision	$ 1.2	$ 0.3

Significant Accounting Polici57

Significant Accounting Policies (Concentrations of Credit Risk/Accounting Standards Updates)(Details) $ in Millions	3 Months Ended
	Mar. 31, 2016USD ($)Tenant	Dec. 31, 2015USD ($)
Concentration of Credit Risk
Deferred debt issuance costs | $	$ 105.3	$ 130.3
Annualized rent | Customer concentration
Concentration of Credit Risk
Number of tenants (tenants) | Tenant	3
Maximum percentage of annualized rent for any one tenant not individually disclosed (percent) (more than)	5.00%
Annualized rent | 11 Madison Avenue | Customer concentration
Concentration of Credit Risk
Percentage of concentration (percent)	9.70%
Annualized rent | 1515 Broadway | Customer concentration
Concentration of Credit Risk
Percentage of concentration (percent)	9.10%
Annualized rent | 388 and 390 Greenwich Street | Customer concentration
Concentration of Credit Risk
Percentage of concentration (percent)	8.30%
Annualized rent | 919 Third Avenue | Customer concentration
Concentration of Credit Risk
Percentage of concentration (percent)	7.00%
Annualized rent | 1185 Avenue of the Americas | Customer concentration
Concentration of Credit Risk
Percentage of concentration (percent)	6.60%
Annualized rent | 420 Lexington Avenue | Customer concentration
Concentration of Credit Risk
Percentage of concentration (percent)	5.70%
Annualized rent | 1 Madison Ave | Customer concentration
Concentration of Credit Risk
Percentage of concentration (percent)	5.00%
Tenant 1 | Annualized rent | Customer concentration
Concentration of Credit Risk
Percentage of concentration (percent)	9.10%
Tenant 2 | Annualized rent | Customer concentration
Concentration of Credit Risk
Percentage of concentration (percent)	8.50%
Tenant 3 | Annualized rent | Customer concentration
Concentration of Credit Risk
Percentage of concentration (percent)	5.90%

Property Acquisitions (Details)

Property Acquisitions (Details) - USD ($) $ in Thousands	1 Months Ended			3 Months Ended
	Mar. 31, 2016	Aug. 31, 2015	Mar. 31, 2015	Mar. 31, 2016	Mar. 31, 2015
Recognized Identifiable Assets Acquired and Liabilities Assumed
Impact to rental revenue for amortization of aggregate below-market leases				$ 345,607	$ 303,329
Impact to depreciation expense				179,308	108,337
183 Broadway
Recognized Identifiable Assets Acquired and Liabilities Assumed
Land	$ 26,640			26,640
Building and building leasehold	2,960			2,960
Above market lease value	0			0
Acquired in-place leases	0			0
Other assets, net of other liabilities	0			0
Assets acquired	29,600			29,600
Mark-to-market assumed debt	0			0
Below market lease value	0			0
Derivatives	0			0
Liabilities assumed	0			0
Purchase price	29,600			29,600
Net consideration funded by us at closing, excluding consideration financed by debt	29,600
Equity and/or debt investment held	0
Debt assumed	$ 0
11 Madison Avenue
Recognized Identifiable Assets Acquired and Liabilities Assumed
Land		$ 675,776
Building and building leasehold		1,553,602
Above market lease value		19,764
Acquired in-place leases		366,949
Other assets, net of other liabilities		0
Assets acquired		2,616,091
Mark-to-market assumed debt		0
Below market lease value		(187,732)
Derivatives		0
Liabilities assumed		(187,732)
Purchase price		2,428,359
Net consideration funded by us at closing, excluding consideration financed by debt		0
Equity and/or debt investment held		0
Debt assumed		0
11 Madison Avenue | As Previously Reported
Recognized Identifiable Assets Acquired and Liabilities Assumed
Land		849,900
Building and building leasehold		$ 1,600,000
1640 Flatbush Avenue
Recognized Identifiable Assets Acquired and Liabilities Assumed
Land			$ 6,226		6,226
Building and building leasehold			501		501
Above market lease value			0		0
Acquired in-place leases			146		146
Other assets, net of other liabilities			0		0
Assets acquired			6,873		6,873
Mark-to-market assumed debt			0		0
Below market lease value			(73)		(73)
Derivatives			0		0
Liabilities assumed			(73)		(73)
Purchase price			6,800		6,800
Net consideration funded by us at closing, excluding consideration financed by debt			0
Equity and/or debt investment held			0
Debt assumed			0
1640 Flatbush Avenue | As Previously Reported
Recognized Identifiable Assets Acquired and Liabilities Assumed
Land			6,100		6,100
Building and building leasehold			$ 700		$ 700
11 Madison Avenue and 1640 Flatbush Avenue
Recognized Identifiable Assets Acquired and Liabilities Assumed
Impact to rental revenue for amortization of aggregate below-market leases				6,000
Impact to depreciation expense				$ 15,400

Properties Held for Sale and 59

Properties Held for Sale and Property Dispositions (Properties Held for Sale) (Details) - 388-390 Greenwich Street - Subsequent Event $ in Millions	1 Months Ended
	Apr. 30, 2016USD ($)
Property Dispositions and Assets Held for Sale
Agreed sale consideration	$ 2,000
Unfunded tenant concessions	$ 242.5

Properties Held for Sale and 60

Properties Held for Sale and Property Dispositions (Property Dispositions) (Details) $ in Thousands	1 Months Ended			3 Months Ended
	Mar. 31, 2016USD ($)ft²	Feb. 29, 2016USD ($)ft²	Dec. 31, 2015USD ($)	Mar. 31, 2016USD ($)ft²	Mar. 31, 2015USD ($)
Properties Sold [Abstract]
Approximate Square Feet (sqft) | ft²	34,850,908			34,850,908
Gain (Loss) on Sale				$ 0	$ 12,983
Employee compensation award	$ 500
Revenues
Rental revenue					236
Escalation and reimbursement revenues					(127)
Other income					0
Total revenues					109
Operating expenses					(631)
Real estate taxes					250
Ground rent					0
Transaction related costs					(49)
Depreciable real estate reserves					0
Interest expense, net of interest income					109
Amortization of deferred financing costs					3
Depreciation and amortization					0
Total expenses					(318)
Net income from discontinued operations				$ 0	$ 427
248-252 Bedford Avenue
Properties Sold [Abstract]
Approximate Square Feet (sqft) | ft²		66,611
Sales Price		$ 55,000
Gain (Loss) on Sale		13,800
Employee compensation award		$ 1,300
885 Third Avenue
Properties Sold [Abstract]
Approximate Square Feet (sqft) | ft²		607,000
Sales Price		$ 453,000
Gain (Loss) on Sale		$ 0	$ (6,600)

Debt and Preferred Equity Inv61

Debt and Preferred Equity Investments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015	Sep. 30, 2014
Debt investment
Increase in debt and preferred equity investments (net of discounts), including investments classified as held-for-sale	$ 128,800	$ 166,900
Decrease in debt and preferred equity investments (net of discounts), including investments classified as held-for-sale	$ 420,200	$ 27,000
Aggregate weighted average current yield (as a percent)	10.47%
Debt Investments Held [Abstract]
Carrying Value, Net of Discounts and Deferred Origination Fees	$ 1,378,616		$ 1,670,020
Debt investment
Debt Investments Held [Abstract]
Future Funding Obligations	100,288
Senior Financing	5,190,867
Carrying Value, Net of Discounts and Deferred Origination Fees	1,335,835		1,627,844
Mezzanine Loan, July 2016
Debt Investments Held [Abstract]
Amount participated out	12,000
Mezzanine Loan, June 2017
Debt Investments Held [Abstract]
Amount participated out	41,300
Mezzanine Loan, November 2023
Debt Investments Held [Abstract]
Amount participated out	5,000
Mezzanine Loan, June 2016
Debt Investments Held [Abstract]
Amount participated out	7,400
Mortgage/Mezzanine Loan, January 2017
Debt Investments Held [Abstract]
Amount participated out	36,300
Mezzanine Loan , June 2017
Debt Investments Held [Abstract]
Amount participated out	14,500
Mezzanine Loan, December 2017
Debt Investments Held [Abstract]
Amount participated out	14,600
Mezzanine Loan, December 2017
Debt Investments Held [Abstract]
Amount participated out	14,100
Mortgage/Mezzanine Loan, December 2017
Debt Investments Held [Abstract]
Amount participated out	5,100
Junior Mortgage Participation/Mezzanine Loan, July 2018
Debt Investments Held [Abstract]
Amount participated out	10,000
Total fixed rate
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	2,629,627
Carrying Value, Net of Discounts and Deferred Origination Fees	441,401		511,389
Total fixed 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	12,917		24,916
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	72,174		72,102
Total fixed rate | Junior Mortgage Participation/Mezzanine Loan, March 2017
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	1,109,000
Carrying Value, Net of Discounts and Deferred Origination Fees	185,266		104,661
Total fixed rate | Mezzanine Loan, June 2017
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	502,100
Carrying Value, Net of Discounts and Deferred Origination Fees	41,137		41,115
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	49,715		49,691
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	26,275		26,262
Loan acquired				$ 26,400
Discount amount				200
Total fixed rate | Mortgage Loan, August 2019
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	0
Carrying Value, Net of Discounts and Deferred Origination Fees	480		513
Total fixed rate | Mezzanine Loan, September 2021
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	15,000
Carrying Value, Net of Discounts and Deferred Origination Fees	3,500		3,500
Total fixed rate | Mezzanine Loan, November 2023
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	89,527
Carrying Value, Net of Discounts and Deferred Origination Fees	19,937		19,936
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 | Junior Mortgage Participation Loan Repaid in March 2016
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	0
Carrying Value, Net of Discounts and Deferred Origination Fees	0		49,000
Total fixed rate | Loan Collateralized by Defeasance Securities Repaid in March 2016
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	0
Carrying Value, Net of Discounts and Deferred Origination Fees	0		23,510
Total fixed rate | Loan Collateralized by Defeasance Securities Repaid in March 2016
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	0
Carrying Value, Net of Discounts and Deferred Origination Fees	0		66,183
Total fixed rate | Junior Mortgage Participation, Related To Mortgage Loan, February 2019
Debt Investments Held [Abstract]
Loan acquired				5,700
Discount amount				$ 5,700
Total floating rate
Debt Investments Held [Abstract]
Future Funding Obligations	100,288
Senior Financing	2,561,240
Carrying Value, Net of Discounts and Deferred Origination Fees	894,434		1,116,455
Total floating rate | Mortgage/Mezzanine Loan, April 2016
Debt Investments Held [Abstract]
Future Funding Obligations	4,693
Senior Financing	0
Carrying Value, Net of Discounts and Deferred Origination Fees	100,837		94,901
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	22,639		22,625
Total floating rate | Mezzanine Loan, September 2016
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	745,215
Carrying Value, Net of Discounts and Deferred Origination Fees	74,311		74,700
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	99,662		99,530
Total floating rate | Mezzanine Loan, December 2016
Debt Investments Held [Abstract]
Future Funding Obligations	10,003
Senior Financing	136,384
Carrying Value, Net of Discounts and Deferred Origination Fees	51,217		49,751
Total floating rate | Mezzanine Loan, December 2016
Debt Investments Held [Abstract]
Future Funding Obligations	281
Senior Financing	39,201
Carrying Value, Net of Discounts and Deferred Origination Fees	13,745		13,731
Total floating rate | Mortgage/Mezzanine Loan, January 2017
Debt Investments Held [Abstract]
Future Funding Obligations	47,001
Senior Financing	0
Carrying Value, Net of Discounts and Deferred Origination Fees	133,395		134,264
Total floating rate | Mezzanine Loan, January 2017
Debt Investments Held [Abstract]
Future Funding Obligations	1,127
Senior Financing	118,949
Carrying Value, Net of Discounts and Deferred Origination Fees	28,754		28,551
Total floating rate | Mezzanine Loan , June 2017
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	40,000
Carrying Value, Net of Discounts and Deferred Origination Fees	15,132		68,977
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	22,896		22,877
Total floating rate | Mortgage/Mezzanine Loan, September 2017
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	0
Carrying Value, Net of Discounts and Deferred Origination Fees	16,915		16,901
Total floating rate | Senior Mortgage Loan, October 2017
Debt Investments Held [Abstract]
Future Funding Obligations	4,394
Senior Financing	0
Carrying Value, Net of Discounts and Deferred Origination Fees	19,416		19,282
Total floating rate | Mezzanine Loan, November 2017
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	60,000
Carrying Value, Net of Discounts and Deferred Origination Fees	14,916		14,904
Total floating rate | Mezzanine Loan, December 2017
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	85,000
Carrying Value, Net of Discounts and Deferred Origination Fees	14,944		29,505
Total floating rate | Mezzanine Loan, December 2017
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	65,000
Carrying Value, Net of Discounts and Deferred Origination Fees	14,483		28,563
Total floating rate | Mortgage/Mezzanine Loan, December 2017
Debt Investments Held [Abstract]
Future Funding Obligations	795
Senior Financing	0
Carrying Value, Net of Discounts and Deferred Origination Fees	14,968		14,942
Total floating rate | Junior Participation Loan, April 2018
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	40,000
Carrying Value, Net of Discounts and Deferred Origination Fees	19,862		19,846
Total floating rate | Mezzanine Loan, April 2018
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	175,000
Carrying Value, Net of Discounts and Deferred Origination Fees	34,752		34,725
Total floating rate | Junior Mortgage Participation/Mezzanine Loan, July 2018
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	55,000
Carrying Value, Net of Discounts and Deferred Origination Fees	10,506		20,510
Total floating rate | Mortgage/Mezzanine Loan, August 2018
Debt Investments Held [Abstract]
Future Funding Obligations	523
Senior Financing	20,523
Carrying Value, Net of Discounts and Deferred Origination Fees	10,806		31,210
Total floating rate | Mezzanine Loan, December 2018
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	33,000
Carrying Value, Net of Discounts and Deferred Origination Fees	26,794		26,777
Total floating rate | Mezzanine Loan, December 2018
Debt Investments Held [Abstract]
Future Funding Obligations	5,267
Senior Financing	156,383
Carrying Value, Net of Discounts and Deferred Origination Fees	53,953		52,774
Total floating rate | Mezzanine Loan, December 2018
Debt Investments Held [Abstract]
Future Funding Obligations	26,204
Senior Financing	217,202
Carrying Value, Net of Discounts and Deferred Origination Fees	52,336		49,625
Total floating rate | Mezzanine Loan, January 2019
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	16,383
Carrying Value, Net of Discounts and Deferred Origination Fees	5,340		0
Total floating rate | Mezzanine Loan, March 2019
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	38,000
Carrying Value, Net of Discounts and Deferred Origination Fees	21,855		21,845
Total floating rate | Mezzanine Loan Contributed for a Joint Venture Interest
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	0
Carrying Value, Net of Discounts and Deferred Origination Fees	0		66,398
Total floating rate | Mortgage/Mezzanine Loan Repaid in March 2016
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	0
Carrying Value, Net of Discounts and Deferred Origination Fees	0		18,395
Total floating rate | Junior Mortgage Participation/Mezzanine Loan Repaid in February 2016
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	0
Carrying Value, Net of Discounts and Deferred Origination Fees	$ 0		$ 40,346

Debt and Preferred Equity Inv62

Debt and Preferred Equity Investments (Preferred Equity Investments)(Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Preferred equity investment
Aggregate weighted average current yield (as a percent)	10.47%
Carrying Value, Net of Discounts and Deferred Origination Fees	$ 1,378,616	$ 1,670,020
Preferred Equity, March 2018
Preferred equity investment
Future Funding Obligations	0
Senior Financing	71,486
Carrying Value, Net of Discounts and Deferred Origination Fees	9,971	9,967
Preferred Equity, November 2018
Preferred equity investment
Future Funding Obligations	5,003
Senior Financing	59,966
Carrying Value, Net of Discounts and Deferred Origination Fees	$ 32,810	32,209
Preferred equity investments
Preferred equity investment
Aggregate weighted average current yield (as a percent)	7.79%
Future Funding Obligations	$ 5,003
Senior Financing	131,452
Carrying Value, Net of Discounts and Deferred Origination Fees	$ 42,781	$ 42,176

Debt and Preferred Equity Inv63

Debt and Preferred Equity Investments (Narrative)(Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2016USD ($)segment	Dec. 31, 2015USD ($)segment	Mar. 31, 2015USD ($)
Preferred equity investment
Carrying Value, Net of Discounts and Deferred Origination Fees	$ 1,378,616,000	$ 1,670,020,000
Number of portfolio segments of financial receivables (segment) | segment	1	1
Additional amount of financing receivables included in other assets	$ 116,100,000		$ 122,300,000
Junior Mortgage Participation Acquired in September 2014
Preferred equity investment
Carrying Value, Net of Discounts and Deferred Origination Fees	$ 0	$ 0

Investments in Unconsolidated64

Investments in Unconsolidated Joint Ventures (Details) $ in Thousands	1 Months Ended	3 Months Ended
	Oct. 31, 2015USD ($)	Mar. 31, 2016USD ($)ft²noteunit	Dec. 31, 2015USD ($)
General information on each joint venture
Net equity investment in VIEs in which the entity is not primary beneficiary | $		$ 181,300	$ 39,700
Approximate Square Feet (sqft) | ft²		34,850,908
100 Park Avenue
General information on each joint venture
Ownership Interest (as a percent)		49.90%
Economic Interest (as a percent)		49.90%
Approximate Square Feet (sqft) | ft²		834,000
Acquisition Price | $		$ 95,800
717 Fifth Avenue
General information on each joint venture
Ownership Interest (as a percent)		10.92%
Economic Interest (as a percent)		10.92%
Approximate Square Feet (sqft) | ft²		119,500
Acquisition Price | $		$ 251,900
800 Third Avenue
General information on each joint venture
Ownership Interest (as a percent)		60.52%
Economic Interest (as a percent)		60.52%
Approximate Square Feet (sqft) | ft²		526,000
Acquisition Price | $		$ 285,000
1745 Broadway
General information on each joint venture
Ownership Interest (as a percent)		56.88%
Economic Interest (as a percent)		56.88%
Approximate Square Feet (sqft) | ft²		674,000
Acquisition Price | $		$ 520,000
Jericho Plaza
General information on each joint venture
Ownership Interest (as a percent)		11.67%	77.78%
Economic Interest (as a percent)		11.67%
Approximate Square Feet (sqft) | ft²		640,000
Acquisition Price | $		$ 210,000
11 West 34th Street
General information on each joint venture
Ownership Interest (as a percent)		30.00%
Economic Interest (as a percent)		30.00%
Approximate Square Feet (sqft) | ft²		17,150
Acquisition Price | $		$ 10,800
3 Columbus Circle
General information on each joint venture
Ownership Interest (as a percent)		48.90%
Economic Interest (as a percent)		48.90%
Approximate Square Feet (sqft) | ft²		741,500
Acquisition Price | $		$ 500,000
280 Park Avenue
General information on each joint venture
Ownership Interest (as a percent)		50.00%
Economic Interest (as a percent)		50.00%
Approximate Square Feet (sqft) | ft²		1,219,158
Acquisition Price | $		$ 400,000
1552-1560 Broadway
General information on each joint venture
Ownership Interest (as a percent)		50.00%
Economic Interest (as a percent)		50.00%
Approximate Square Feet (sqft) | ft²		35,897
Acquisition Price | $		$ 136,550
724 Fifth Avenue
General information on each joint venture
Ownership Interest (as a percent)		50.00%
Economic Interest (as a percent)		50.00%
Approximate Square Feet (sqft) | ft²		65,040
Acquisition Price | $		$ 223,000
10 East 53rd Street
General information on each joint venture
Ownership Interest (as a percent)		55.00%
Economic Interest (as a percent)		55.00%
Approximate Square Feet (sqft) | ft²		354,300
Acquisition Price | $		$ 252,500
33 Beekman
General information on each joint venture
Ownership Interest (as a percent)		45.90%
Economic Interest (as a percent)		45.90%
Approximate Square Feet (sqft) | ft²		163,500
Acquisition Price | $		$ 31,000
Agreed sale consideration | $	$ 196,000
521 Fifth Avenue
General information on each joint venture
Ownership Interest (as a percent)		50.50%
Economic Interest (as a percent)		50.50%
Approximate Square Feet (sqft) | ft²		460,000
Acquisition Price | $		$ 315,000
21 East 66th Street
General information on each joint venture
Ownership Interest (as a percent)		32.28%
Economic Interest (as a percent)		32.28%
Approximate Square Feet (sqft) | ft²		16,736
Acquisition Price | $		$ 75,000
21 East 66th Street | Three Retail and Two Residential Units
General information on each joint venture
Ownership Interest (as a percent)		32.28%
Number of Stores | unit		3
Number Of Residential Units | unit		2
21 East 66th Street | Three Residential Units
General information on each joint venture
Ownership Interest (as a percent)		16.14%
Number Of Residential Units | unit		3
650 Fifth Avenue
General information on each joint venture
Ownership Interest (as a percent)		50.00%
Economic Interest (as a percent)		50.00%
Approximate Square Feet (sqft) | ft²		32,324
Acquisition Price | $		$ 0
121 Greene Street
General information on each joint venture
Ownership Interest (as a percent)		50.00%
Economic Interest (as a percent)		50.00%
Approximate Square Feet (sqft) | ft²		7,131
Acquisition Price | $		$ 27,400
175-225 Third Street Brooklyn, New York
General information on each joint venture
Ownership Interest (as a percent)		95.00%
Economic Interest (as a percent)		95.00%
Approximate Square Feet (sqft) | ft²		0
Acquisition Price | $		$ 74,600
55 West 46th Street
General information on each joint venture
Ownership Interest (as a percent)		25.00%
Economic Interest (as a percent)		25.00%
Approximate Square Feet (sqft) | 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
131-137 Spring Street
General information on each joint venture
Ownership Interest (as a percent)		20.00%
Economic Interest (as a percent)		20.00%
Approximate Square Feet (sqft) | ft²		68,342
Acquisition Price | $		$ 277,750
76 11th Avenue
General information on each joint venture
Ownership Interest (as a percent)		33.33%
Economic Interest (as a percent)		36.58%
Approximate Square Feet (sqft) | ft²		764,000
Acquisition Price | $		$ 138,240
Number of mezzanine notes secured by interests in the entity which owns 76 11th avenue | note		2
Exit fee, percentage owned		50.00%
76 11th Avenue | Joint venture
General information on each joint venture
Exit fee, percentage owned		25.00%
1552 Broadway
General information on each joint venture
Approximate Square Feet (sqft) | ft²		13,045

Investments in Unconsolidated65

Investments in Unconsolidated Joint Ventures (Acquisition, Development and Construction Arrangements/Sale of Joint Venture Interest or Property)(Details) - USD ($) $ in Thousands	1 Months Ended		3 Months Ended
	Mar. 31, 2016	Feb. 29, 2016	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]
Acquisition, development and construction arrangements, carrying value	$ 145,774		$ 145,774		$ 145,878
Gain (Loss) on Sale			$ 0	$ 12,983
Employee compensation award	$ 500
1 Jericho Plaza
Schedule of Equity Method Investments [Line Items]
Ownership Percentage		66.11%
Gross Asset Valuation		$ 95,200
Gain (Loss) on Sale		$ 3,300
7 Renaissance Square
Schedule of Equity Method Investments [Line Items]
Ownership Percentage	50.00%		50.00%
Gross Asset Valuation	$ 20,700		$ 20,700
Gain (Loss) on Sale	$ 4,200
EOP Denver
Schedule of Equity Method Investments [Line Items]
Ownership Percentage	4.79%		4.79%
Gross Asset Valuation	$ 180,700		$ 180,700
Gain (Loss) on Sale	2,800
Mezzanine loan and preferred equity due March 2017
Schedule of Equity Method Investments [Line Items]
Acquisition, development and construction arrangements, carrying value	100,000		100,000		99,936
Mezzanine loan due February 2022
Schedule of Equity Method Investments [Line Items]
Acquisition, development and construction arrangements, carrying value	$ 45,774		$ 45,774		$ 45,942

Investments in Unconsolidated66

Investments in Unconsolidated Joint Ventures (Mortgages and Other Loans Payable)(Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Apr. 30, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Total fixed rate debt	$ 5,990,813		$ 5,816,010
Total floating rate debt	1,130,887		1,205,494
Total fixed rate and floating rate debt	7,121,700		7,021,504
Deferred financing costs, net	$ (105,300)		(130,300)
280 Park Avenue
Debt Instrument [Line Items]
Ownership Percentage	50.00%
1745 Broadway
Debt Instrument [Line Items]
Total fixed rate debt	$ 16,000		16,000
Ownership Percentage	56.88%
521 Fifth Avenue
Debt Instrument [Line Items]
Ownership Percentage	50.50%
717 Fifth Avenue
Debt Instrument [Line Items]
Ownership Percentage	10.92%
21 East 66th Street
Debt Instrument [Line Items]
Ownership Percentage	32.28%
3 Columbus Circle
Debt Instrument [Line Items]
Ownership Percentage	48.90%
800 Third Avenue
Debt Instrument [Line Items]
Ownership Percentage	60.52%
650 Fifth Avenue
Debt Instrument [Line Items]
Ownership Percentage	50.00%
175-225 Third Street Brooklyn, New York
Debt Instrument [Line Items]
Ownership Percentage	95.00%
10 East 53rd Street
Debt Instrument [Line Items]
Ownership Percentage	55.00%
724 Fifth Avenue
Debt Instrument [Line Items]
Ownership Percentage	50.00%
33 Beekman
Debt Instrument [Line Items]
Ownership Percentage	45.90%
55 West 46th Street
Debt Instrument [Line Items]
Ownership Percentage	25.00%
121 Greene Street
Debt Instrument [Line Items]
Ownership Percentage	50.00%
11 West 34th Street
Debt Instrument [Line Items]
Ownership Percentage	30.00%
100 Park Avenue
Debt Instrument [Line Items]
Ownership Percentage	49.90%
131-137 Spring Street
Debt Instrument [Line Items]
Ownership Percentage	20.00%
Joint venture
Debt Instrument [Line Items]
Total fixed rate debt	$ 2,790,103		2,645,131
Total floating rate debt	1,576,688		1,663,982
Total fixed rate and floating rate debt	4,366,791		4,309,113
Deferred financing costs, net	(47,136)		(42,565)
Total joint venture mortgages and other loans payable, net	4,319,655		4,266,548
Maximum amount of loan recourse to entity	18,400
Joint venture | 280 Park Avenue
Debt Instrument [Line Items]
Total fixed rate debt	691,048		692,963
Joint venture | 1745 Broadway
Debt Instrument [Line Items]
Total fixed rate debt	340,000		340,000
Joint venture | Jericho Plaza
Debt Instrument [Line Items]
Total floating rate debt	$ 75,000		163,750
Ownership Percentage	11.67%
Term (in Years)	2 years
Face amount of loan	$ 100,000
Joint venture | 521 Fifth Avenue
Debt Instrument [Line Items]
Total fixed rate debt	170,000		170,000
Joint venture | 717 Fifth Avenue | Mortgage loan
Debt Instrument [Line Items]
Committed amount	300,000
Joint venture | 717 Fifth Avenue | Mezzanine loans
Debt Instrument [Line Items]
Committed amount	290,000
Joint venture | 717 Fifth Avenue | Initial Maturity July 2022
Debt Instrument [Line Items]
Total fixed rate debt	300,000		300,000
Joint venture | 717 Fifth Avenue | Initial Maturity July 2024
Debt Instrument [Line Items]
Total fixed rate debt	328,704		325,704
Joint venture | 21 East 66th Street
Debt Instrument [Line Items]
Total fixed rate debt	12,000		12,000
Total floating rate debt	1,785		1,805
Joint venture | 3 Columbus Circle
Debt Instrument [Line Items]
Total fixed rate debt	350,000		350,000
Joint venture | 800 Third Avenue
Debt Instrument [Line Items]
Total fixed rate debt	177,000		20,910
Joint venture | Stonehenge Portfolio
Debt Instrument [Line Items]
Total fixed rate debt	421,351		430,627
Total floating rate debt	10,500		10,500
Joint venture | Stonehenge Portfolio | Initial Maturity July 2016
Debt Instrument [Line Items]
Total fixed rate debt	13,300
Joint venture | Stonehenge Portfolio | Initial Maturity June 2017
Debt Instrument [Line Items]
Total fixed rate debt	55,300
Joint venture | Stonehenge Portfolio | Initial Maturity November 2017
Debt Instrument [Line Items]
Total fixed rate debt	34,900
Joint venture | Stonehenge Portfolio | Initial Maturity August 2019
Debt Instrument [Line Items]
Total fixed rate debt	140,900
Joint venture | Stonehenge Portfolio | Initial Maturity June 2024
Debt Instrument [Line Items]
Total fixed rate debt	177,000
Joint venture | 7 Renaissance Square
Debt Instrument [Line Items]
Total fixed rate debt	0		2,927
Joint venture | 1552 Broadway
Debt Instrument [Line Items]
Total floating rate debt	190,410		190,409
Joint venture | 1552 Broadway | Mortgage loan
Debt Instrument [Line Items]
Committed amount	150,000
Unfunded amount	600
Joint venture | 1552 Broadway | Mezzanine loans
Debt Instrument [Line Items]
Committed amount	41,500
Unfunded amount	500
Joint venture | Other loan payable
Debt Instrument [Line Items]
Total floating rate debt	30,000		30,000
Joint venture | 650 Fifth Avenue
Debt Instrument [Line Items]
Total floating rate debt	65,000		65,000
Joint venture | 650 Fifth Avenue | Mortgage loan
Debt Instrument [Line Items]
Committed amount	97,000
Unfunded amount	32,000
Joint venture | 175-225 Third Street Brooklyn, New York
Debt Instrument [Line Items]
Total floating rate debt	40,000		40,000
Joint venture | 10 East 53rd Street
Debt Instrument [Line Items]
Total floating rate debt	125,000		125,000
Joint venture | 724 Fifth Avenue
Debt Instrument [Line Items]
Total floating rate debt	275,000		275,000
Joint venture | 33 Beekman
Debt Instrument [Line Items]
Total floating rate debt	73,457		73,518
Maximum amount of loan recourse to entity	75,000
Joint venture | 55 West 46th Street
Debt Instrument [Line Items]
Total floating rate debt	151,536		150,000
Joint venture | 55 West 46th Street | Mortgage loan
Debt Instrument [Line Items]
Committed amount	190,000
Unfunded amount	38,500
Joint venture | 121 Greene Street
Debt Instrument [Line Items]
Total floating rate debt	15,000		15,000
Joint venture | 11 West 34th Street
Debt Instrument [Line Items]
Total floating rate debt	23,000		23,000
Joint venture | 100 Park Avenue
Debt Instrument [Line Items]
Total floating rate debt	360,000		360,000
Joint venture | 131-137 Spring Street
Debt Instrument [Line Items]
Total floating rate debt	$ 141,000		$ 141,000
Weighted Average | 1745 Broadway
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	4.81%
Weighted Average | Joint venture | 280 Park Avenue
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	6.57%
Weighted Average | Joint venture | 1745 Broadway
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	5.68%
Weighted Average | Joint venture | Jericho Plaza
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)	5.28%
Weighted Average | Joint venture | 521 Fifth Avenue
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	3.73%
Weighted Average | Joint venture | 717 Fifth Avenue | Initial Maturity July 2022
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	4.45%
Weighted Average | Joint venture | 717 Fifth Avenue | Initial Maturity July 2024
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	9.00%
Weighted Average | Joint venture | 21 East 66th Street
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	3.60%
Interest rate, floating rate debt (as a percent)	3.00%
Weighted Average | Joint venture | 3 Columbus Circle
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	3.61%
Weighted Average | Joint venture | 800 Third Avenue
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	3.17%
Weighted Average | Joint venture | Stonehenge Portfolio
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	4.20%
Interest rate, floating rate debt (as a percent)	3.50%
Weighted Average | Joint venture | 1552 Broadway
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)	4.58%
Weighted Average | Joint venture | Other loan payable
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)	1.32%
Weighted Average | Joint venture | 650 Fifth Avenue
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)	3.92%
Weighted Average | Joint venture | 175-225 Third Street Brooklyn, New York
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)	4.50%
Weighted Average | Joint venture | 10 East 53rd Street
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)	2.92%
Weighted Average | Joint venture | 724 Fifth Avenue
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)	2.84%
Weighted Average | Joint venture | 33 Beekman
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)	3.17%
Weighted Average | Joint venture | 55 West 46th Street
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)	2.72%
Weighted Average | Joint venture | 121 Greene Street
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)	1.92%
Weighted Average | Joint venture | 11 West 34th Street
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)	1.88%
Weighted Average | Joint venture | 100 Park Avenue
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)	2.18%
Weighted Average | Joint venture | 131-137 Spring Street
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)	1.97%
Subsequent Event | Joint venture | Stonehenge Portfolio | Initial Maturity October 2016
Debt Instrument [Line Items]
Total fixed rate debt		$ 13,300

Investments in Unconsolidated67

Investments in Unconsolidated Joint Ventures (Schedules of Combined Financial Statements for the Unconsolidated Joint Ventures)(Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Assets
Commercial real estate property, net	$ 12,828,941		$ 14,620,896
Other assets	1,055,267		850,939
Liabilities and members' equity
Mortgages and other loans payable, net	5,585,171		6,881,920
Other liabilities	247,950		168,477
Company's investments in unconsolidated joint ventures	1,146,085		1,203,858
Combined statements of income for the unconsolidated joint ventures
Operating expenses	79,520	$ 76,777
Ground rent	8,308	8,188
Real estate taxes	61,674	55,723
Interest expense, net of interest income	94,672	75,807
Amortization of deferred financing costs	7,932	6,615
Transaction related costs	1,279	1,143
Depreciation and amortization	179,308	108,337
Total expenses	456,725	358,054
Company's equity in net income from unconsolidated joint ventures	10,096	4,030
Joint venture
Assets
Commercial real estate property, net	5,998,692		6,122,468
Debt and preferred equity investments, net	284,014		145,878
Other assets	673,317		715,840
Total assets	6,956,023		6,984,186
Liabilities and members' equity
Mortgages and other loans payable, net	4,319,655		4,266,548
Other liabilities	523,359		523,160
Members' equity	2,113,009		2,194,478
Total liabilities and members' equity	6,956,023		$ 6,984,186
Combined statements of income for the unconsolidated joint ventures
Total revenues	162,512	128,916
Operating expenses	27,254	25,486
Ground rent	3,211	2,592
Real estate taxes	24,210	19,376
Interest expense, net of interest income	49,736	44,007
Amortization of deferred financing costs	3,236	3,010
Transaction related costs	0	8
Depreciation and amortization	37,851	32,984
Total expenses	145,498	127,463
Loss on early extinguishment of debt	(1,606)	(833)
Net income before gain on sale	15,408	620
Company's equity in net income from unconsolidated joint ventures	10,096	4,030
Joint venture
Investment in Unconsolidated Joint Ventures
Management fees, base revenue	$ 4,500	$ 2,800

Deferred Costs (Details)

Deferred Costs (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Deferred leasing	$ 431,033	$ 415,406
Less: accumulated amortization	(184,530)	(175,486)
Deferred costs, net	$ 246,503	$ 239,920

Mortgages and Other Loans Pay69

Mortgages and Other Loans Payable (Details)	Dec. 06, 2015USD ($)	Mar. 31, 2016USD ($)advance$ / shares	Dec. 31, 2015USD ($)
Debt Instrument [Line Items]
Total fixed rate debt		$ 5,990,813,000	$ 5,816,010,000
Total floating rate debt		1,130,887,000	1,205,494,000
Total fixed rate and floating rate debt		7,121,700,000	7,021,504,000
Mortgages reclassed to liabilities related to assets held for sale(4)(8)		(1,450,000,000)	(29,000,000)
Total mortgages and other loans payable		5,671,700,000	6,992,504,000
Deferred financing costs, net of amortization		(86,529,000)	(110,584,000)
Total mortgages and other loans payable, net		5,585,171,000	6,881,920,000
Federal Home Loan Bank Advances outstanding		$ 250,800,000
Federal Home Loan Bank, advances, weighted-average borrowing rate (as a percent)		0.88%
Deferred financing costs, net of amortization		$ 105,300,000	130,300,000
Book value of collateral		8,900,000,000	10,800,000,000
Series J Preferred Units
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 (as a percent)		3.75%
Preferred Units, liquidation preference (in dollars per unit) | $ / shares		$ 1,000
Series J Preferred Units | Weighted Average
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)		3.75%
Master Repurchase Agreement
Debt Instrument [Line Items]
Total floating rate debt		$ 185,898,000	253,424,000
Maximum facility capacity		$ 300,000,000
Basis Point Fee (as a percent)	0.25%
Threshold amount for basis point fee to be applicable (less than)	$ 150,000,000
Master Repurchase Agreement | Weighted Average
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)		4.00%
Master Repurchase Agreement | Minimum | LIBOR
Debt Instrument [Line Items]
Credit facility, interest rate (as a percent)		2.50%
Master Repurchase Agreement | Maximum | LIBOR
Debt Instrument [Line Items]
Credit facility, interest rate (as a percent)		3.25%
FHLB Facility
Debt Instrument [Line Items]
Total fixed rate debt		$ 205,000,000	0
Total floating rate debt		$ 45,750,000	45,750,000
Number of Federal Home Loan Bank Advances | advance		4
FHLB Facility | Minimum
Debt Instrument [Line Items]
Federal Home Loan Bank, advances, weighted-average borrowing rate (as a percent)		0.69%
FHLB Facility | Maximum
Debt Instrument [Line Items]
Federal Home Loan Bank, advances, weighted-average borrowing rate (as a percent)		1.03%
FHLB Advance Maturing in January 2017
Debt Instrument [Line Items]
Number of Federal Home Loan Bank Advances | advance		2
Federal Home Loan Bank Advances outstanding		$ 105,000,000
FHLB Advance Maturing in January 2017, 2
Debt Instrument [Line Items]
Federal Home Loan Bank Advances outstanding		100,000,000
FHLB Advance Maturing in April 2016
Debt Instrument [Line Items]
Federal Home Loan Bank Advances outstanding		1,000,000
FHLB Advance Maturing in April 2016, 2
Debt Instrument [Line Items]
Federal Home Loan Bank Advances outstanding		15,800,000
FHLB Advance Maturing in June 2016
Debt Instrument [Line Items]
Federal Home Loan Bank Advances outstanding		5,000,000
FHLB Advance Maturing in December 2016
Debt Instrument [Line Items]
Federal Home Loan Bank Advances outstanding		24,000,000
Landmark Square
Debt Instrument [Line Items]
Total fixed rate debt		$ 79,124,000	79,562,000
Landmark Square | Weighted Average
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)		4.00%
485 Lexington Avenue
Debt Instrument [Line Items]
Total fixed rate debt		$ 450,000,000	450,000,000
485 Lexington Avenue | Weighted Average
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)		5.61%
762 Madison Avenue
Debt Instrument [Line Items]
Total fixed rate debt		$ 7,828,000	7,872,000
762 Madison Avenue | Weighted Average
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)		3.86%
885 Third Avenue(3)
Debt Instrument [Line Items]
Total fixed rate debt		$ 267,650,000	267,650,000
885 Third Avenue(3) | Weighted Average
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)		6.26%
1745 Broadway
Debt Instrument [Line Items]
Total fixed rate debt		$ 16,000,000	16,000,000
1745 Broadway | Weighted Average
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)		4.81%
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
Deferred financing costs, net of amortization		$ 24,500,000
388-390 Greenwich Street | Weighted Average
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)		3.25%
Interest rate, floating rate debt (as a percent)		2.16%
One Madison Avenue
Debt Instrument [Line Items]
Total fixed rate debt		$ 536,848,000	542,817,000
One Madison Avenue | Weighted Average
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)		5.91%
100 Church Street
Debt Instrument [Line Items]
Total fixed rate debt		$ 224,188,000	225,099,000
100 Church Street | Weighted Average
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)		4.68%
919 Third Avenue
Debt Instrument [Line Items]
Total fixed rate debt		$ 500,000,000	500,000,000
Interest in property (as a percent)		51.00%
919 Third Avenue | Weighted Average
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)		5.12%
400 East 57th Street
Debt Instrument [Line Items]
Total fixed rate debt		$ 67,323,000	67,644,000
400 East 57th Street | Weighted Average
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)		4.13%
400 East 58th Street
Debt Instrument [Line Items]
Total fixed rate debt		$ 28,852,000	28,990,000
400 East 58th Street | Weighted Average
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)		4.13%
420 Lexington Avenue
Debt Instrument [Line Items]
Total fixed rate debt		$ 300,000,000	300,000,000
420 Lexington Avenue | Weighted Average
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)		3.99%
1515 Broadway
Debt Instrument [Line Items]
Total fixed rate debt		$ 900,000,000	900,000,000
1515 Broadway | Weighted Average
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)		3.93%
11 Madison Avenue
Debt Instrument [Line Items]
Total fixed rate debt		$ 1,400,000,000	1,400,000,000
11 Madison Avenue | Weighted Average
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)		3.84%
500 West Putnam Avenue
Debt Instrument [Line Items]
Total fixed rate debt		$ 0	22,376,000
600 Lexington Avenue
Debt Instrument [Line Items]
Total floating rate debt		$ 111,822,000	112,795,000
600 Lexington Avenue | Weighted Average
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)		2.56%
187 Broadway & 5-7 Dey Street
Debt Instrument [Line Items]
Total floating rate debt		$ 40,000,000	40,000,000
187 Broadway & 5-7 Dey Street | Weighted Average
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)		3.05%
719 Seventh Avenue
Debt Instrument [Line Items]
Total floating rate debt		$ 22,892,000	0
719 Seventh Avenue | Weighted Average
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)		3.49%
1080 Amsterdam
Debt Instrument [Line Items]
Total floating rate debt		$ 3,525,000	3,525,000
1080 Amsterdam | Weighted Average
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)		4.18%
220 East 42nd Street
Debt Instrument [Line Items]
Total floating rate debt		$ 275,000,000	275,000,000
220 East 42nd Street | Weighted Average
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)		2.02%
248-252 Bedford Avenue
Debt Instrument [Line Items]
Total floating rate debt		$ 0	$ 29,000,000
Deferred financing costs, net of amortization		$ 1,000,000

Corporate Indebtedness (Details

Corporate Indebtedness (Details) - USD ($) $ in Thousands	1 Months Ended				3 Months Ended
	Jul. 31, 2015	Jan. 31, 2015	Nov. 30, 2014	Mar. 31, 2014	Mar. 31, 2016	Dec. 31, 2015
Corporate Indebtedness
Increase in credit facility	$ 500,000
Outstanding under line of credit facility					$ 766,733	$ 985,055
Long-term debt, carrying value					10,084,708
Revolving credit facility
Corporate Indebtedness
Increase in credit facility	400,000
Credit facility, maximum borrowing capacity	1,600,000				1,600,000
Maximum borrowing capacity, optional expansion					$ 3,000,000
Effective rate (as a percent)					1.68%
Facility fee (as a percent)					0.25%
Outstanding under line of credit facility					$ 775,000
Revolving credit facility | Minimum
Corporate Indebtedness
Facility fee (as a percent)					0.125%
Revolving credit facility | Maximum
Corporate Indebtedness
Facility fee (as a percent)					0.30%
Revolving credit facility | LIBOR
Corporate Indebtedness
Interest rate added to base rate (as a percent)					1.25%
Revolving credit facility | LIBOR | Minimum
Corporate Indebtedness
Interest rate added to base rate (as a percent)					0.875%
Revolving credit facility | LIBOR | Maximum
Corporate Indebtedness
Interest rate added to base rate (as a percent)					1.55%
Term loan
Corporate Indebtedness
Increase in credit facility	100,000		$ 50,000	$ 383,000
Credit facility, maximum borrowing capacity	$ 933,000		$ 833,000	$ 783,000	$ 933,000
Decrease in basis points		0.20%		0.25%
Decrease in facility fee (as a percent)		0.05%
Effective rate (as a percent)					1.89%
Long-term debt, carrying value					$ 933,000
Term loan | Line of Credit
Corporate Indebtedness
Long-term debt, carrying value					$ 929,800	929,500
Term loan | LIBOR
Corporate Indebtedness
Interest rate added to base rate (as a percent)					1.40%
Term loan | LIBOR | Minimum
Corporate Indebtedness
Interest rate added to base rate (as a percent)					0.95%
Term loan | LIBOR | Maximum
Corporate Indebtedness
Interest rate added to base rate (as a percent)					1.90%
2012 Credit Facility
Corporate Indebtedness
Letters of credit					$ 74,300
Ability to borrow under line of credit facility					750,700
Long-term debt, carrying value					775,000
2012 Credit Facility | Line of Credit
Corporate Indebtedness
Long-term debt, carrying value					$ 766,700	$ 985,100

Corporate Indebtedness (Senior

Corporate Indebtedness (Senior Unsecured Notes)(Details)	3 Months Ended
	Mar. 31, 2016USD ($)	Dec. 31, 2015USD ($)	Oct. 06, 2010USD ($)$ / shares	Mar. 20, 2007$ / shares
Debt disclosures by scheduled maturity date
Accreted Balance	$ 2,056,623,000	$ 2,308,478,000
Deferred financing costs, net	(105,300,000)	(130,300,000)
Senior unsecured notes
Debt disclosures by scheduled maturity date
Unpaid Principal Balance	1,155,008,000
Accreted Balance	1,134,116,000	1,386,244,000
Deferred financing costs, net	(7,257,000)	(7,280,000)
Accreted Balance, Net of Deferred Financing Costs	1,126,859,000	1,378,964,000
Senior unsecured notes | 3.00% Senior unsecured notes maturing on October 15, 2017
Debt disclosures by scheduled maturity date
Unpaid Principal Balance	345,000,000
Accreted Balance	$ 324,281,000	321,130,000
Coupon Rate (as a percent)	3.00%
Effective rate (as a percent)	6.65%
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)	12.4230
Principal amount of debentures, basis for conversion	$ 1,000
Amount of convertible debt recorded in equity			$ 78,300,000
Debt Instrument, Unamortized Discount	20,700,000
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	$ 249,827,000	249,810,000
Coupon Rate (as a percent)	5.00%
Effective rate (as a percent)	5.03%
Term (in Years)	7 years
Senior unsecured notes | 7.75% Senior unsecured notes maturing on March 15, 2020
Debt disclosures by scheduled maturity date
Unpaid Principal Balance	$ 250,000,000
Accreted Balance	$ 250,000,000	250,000,000
Coupon Rate (as a percent)	7.75%
Effective rate (as a percent)	7.75%
Term (in Years)	10 years
Senior unsecured notes | 4.50% Senior unsecured notes maturing on December 1, 2022
Debt disclosures by scheduled maturity date
Unpaid Principal Balance	$ 200,000,000
Accreted Balance	$ 200,000,000	200,000,000
Coupon Rate (as a percent)	4.50%
Effective rate (as a percent)	4.50%
Term (in Years)	10 years
Senior unsecured notes | 4.27% Senior unsecured notes maturing on December 17, 2025
Debt disclosures by scheduled maturity date
Unpaid Principal Balance	$ 100,000,000
Accreted Balance	$ 100,000,000	100,000,000
Coupon Rate (as a percent)	4.27%
Effective rate (as a percent)	4.27%
Term (in Years)	10 years
Senior unsecured notes | 3.00% Senior unsecured notes maturing on March 30, 2027
Debt disclosures by scheduled maturity date
Unpaid Principal Balance	$ 10,008,000
Accreted Balance	$ 10,008,000	10,008,000
Coupon Rate (as a percent)	3.00%
Effective rate (as a percent)	3.00%
Term (in Years)	20 years
Premium on sale price to calculate exchange price of notes (as a percent)				25.00%
Exchange price (in dollars per share) | $ / shares				$ 173.30
Adjusted exchange rate for the debentures (in shares)	5.7974
Principal amount of debentures, basis for conversion	$ 1,000
Senior unsecured notes | Senior Unsecured Notes repaid in March 2016
Debt disclosures by scheduled maturity date
Unpaid Principal Balance	0
Accreted Balance	$ 0	$ 255,296,000

Corporate Indebtedness (Junior

Corporate Indebtedness (Junior Subordinated Deferrable Interest Debentures and Principal Maturities)(Details) - USD ($)	1 Months Ended	3 Months Ended
	Jun. 30, 2005	Mar. 31, 2016
Scheduled Amortization and Principal Repayments
Remaining 2,016		$ 351,810,000
2,017		1,495,199,000
2,018		356,536,000
2,019		1,003,255,000
2,020		1,757,330,000
Thereafter		5,120,578,000
Total amortization of debt and principal repayments		10,084,708,000
Joint Venture Debt
Principal Repayments and Joint Venture Debt
Remaining 2,016		526,982,000
2,017		591,284,000
2,018		447,000
2,019		104,687,000
2,020		30,298,000
Thereafter		451,544,000
Total principal repayments		$ 1,705,242,000
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 2,016		$ 0
2,017		0
2,018		0
2,019		0
2,020		0
Thereafter		100,000,000
Total amortization of debt and principal repayments		100,000,000
Mortgages and other loans payable
Scheduled Amortization
Remaining 2,016		42,226,000
2,017		63,643,000
2,018		64,119,000
2,019		70,255,000
2,020		52,799,000
Thereafter		147,604,000
Total amortization of debt		440,646,000
Principal Repayments and Joint Venture Debt
Remaining 2,016		309,584,000
2,017		1,076,548,000
2,018		42,417,000
2,019		0
2,020		679,531,000
Thereafter		4,572,974,000
Total principal repayments		6,681,054,000
Revolving Credit Facility
Scheduled Amortization and Principal Repayments
Remaining 2,016		0
2,017		0
2,018		0
2,019		0
2,020		775,000,000
Thereafter		0
Total amortization of debt and principal repayments		775,000,000
Unsecured Term Loan
Scheduled Amortization and Principal Repayments
Remaining 2,016		0
2,017		0
2,018		0
2,019		933,000,000
2,020		0
Thereafter		0
Total amortization of debt and principal repayments		933,000,000
Senior Unsecured Notes
Scheduled Amortization and Principal Repayments
Remaining 2,016		0
2,017		355,008,000
2,018		250,000,000
2,019		0
2,020		250,000,000
Thereafter		300,000,000
Total amortization of debt and principal repayments		$ 1,155,008,000
LIBOR | Trust Preferred Securities
Debt Instrument [Line Items]
Interest rate added to base rate (as a percent)		1.25%
LIBOR | Unsecured Term Loan
Debt Instrument [Line Items]
Interest rate added to base rate (as a percent)		1.40%

Corporate Indebtedness (Schedul

Corporate Indebtedness (Schedule of Consolidated Interest Expense, Excluding Capitalized Interest)(Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Interest expense
Interest expense	$ 102,155	$ 85,017
Interest capitalized	(6,618)	(8,558)
Interest income	(865)	(652)
Interest expense, net	$ 94,672	$ 75,807

Related Party Transactions (Det

Related Party Transactions (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Amounts due from/to related parties
Due from joint ventures	$ 2,005		$ 1,334
Other	13,143		9,316
Related party receivables	15,148		$ 10,650
Alliance Building Services
Related Party Transactions
Profit participation from related party	900	$ 1,000
Payments made for services	3,800	4,000
Entity with Stephen L Green ownership interest
Related Party Transactions
Property management fees from related party	$ 100	$ 100

Noncontrolling Interests on t75

Noncontrolling Interests on the Company's Consolidated Financial Statements (Details)	1 Months Ended	3 Months Ended		12 Months Ended
	Jan. 31, 2012$ / sharesshares	Mar. 31, 2016USD ($)unit$ / sharesshares	Mar. 31, 2015USD ($)	Dec. 31, 2015USD ($)unit	Aug. 31, 2015shares	Jul. 31, 2015shares	Jun. 30, 2015shares	Feb. 28, 2015shares	Aug. 31, 2014shares
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Balance at beginning of period | $		$ 424,206,000
Net income | $		922,000	$ 1,743,000
Accumulated other comprehensive income allocation | $		(322,000)	(200,000)
Balance at end of period | $		$ 407,046,000		$ 424,206,000
Number of company common stock issued on conversion of Series B preferred units		6.71348
SL Green Operating Partnership
Organization
Noncontrolling interest in the operating partnership (as a percent)		3.84%		3.61%
Number of units of operating partnership owned by the noncontrolling interest unit holders (shares) | unit		4,000,632		3,745,766
Shares of common stock reserved for issuance upon redemption of units of limited partnership interest in operating partnership (shares) | shares		4,000,632
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Balance at beginning of period | $		$ 424,206,000	469,524,000	$ 469,524,000
Distributions | $		(2,881,000)		(9,710,000)
Issuance of units | $		18,140,000		30,506,000
Redemption of units | $		(7,152,000)		(55,697,000)
Net income | $		922,000		10,565,000
Accumulated other comprehensive income allocation | $		(322,000)	$ (200,000)	(67,000)
Fair value adjustment | $		(25,867,000)		(20,915,000)
Balance at end of period | $		$ 407,046,000		$ 424,206,000
SL Green Operating Partnership | Series G Preferred Units
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Number of preferred units issued (in shares) | shares	1,902,000
Dividend rate preferred units (as a percent)	4.50%
Liquidation preference of preferred units (in dollars per share)	$ 25
Annual dividends on preferred units (in dollars per share)		$ 1.125
Operating partnership common stock value use for conversion of preferred units (in dollars per share)	$ 88.50
Number of company common stock issue on redemption of operation partnership common units	1
SL Green Operating Partnership | Series F Preferred Units
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Number of preferred units issued (in shares) | shares		60
Mandatory liquidation preference (in dollars per share) | $		$ 1,000
SL Green Operating Partnership | Series K Preferred Units
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Number of preferred units issued (in shares) | shares									563,954
Dividend rate preferred units (as a percent)		3.50%
Liquidation preference of preferred units (in dollars per share)		$ 25
Annual dividends on preferred units (in dollars per share)		0.875
Operating partnership common stock value use for conversion of preferred units (in dollars per share)		$ 134.67
Preferred Units, shares authorized | shares		700,000
SL Green Operating Partnership | Series L Preferred Units
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Number of preferred units issued (in shares) | shares									378,634
Dividend rate preferred units (as a percent)		4.00%
Liquidation preference of preferred units (in dollars per share)		$ 25
Annual dividends on preferred units (in dollars per share)		$ 1
Preferred Units, shares authorized | shares		500,000
SL Green Operating Partnership | Series M Preferred Units
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Number of preferred units issued (in shares) | shares								1,600,000
Dividend rate preferred units (as a percent)		3.75%
Liquidation preference of preferred units (in dollars per share)		$ 25
Annual dividends on preferred units (in dollars per share)		$ 0.9375
Preferred Units, shares authorized | shares		1,600,000
SL Green Operating Partnership | Series N Preferred Units
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Number of preferred units issued (in shares) | shares							552,303
Dividend rate preferred units (as a percent)		3.00%
Liquidation preference of preferred units (in dollars per share)		$ 25
Annual dividends on preferred units (in dollars per share)		$ 0.75
Preferred Units, shares authorized | shares		552,303
SL Green Operating Partnership | Series O Preferred Units
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Dividend rate preferred units (as a percent)		6.25%
Preferred Units, shares authorized | shares		1
SL Green Operating Partnership | Series P Preferred Units
Organization
Shares of common stock reserved for issuance upon redemption of units of limited partnership interest in operating partnership (shares) | shares		200,000
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Number of preferred units issued (in shares) | shares						200,000
Dividend rate preferred units (as a percent)		4.00%
Liquidation preference of preferred units (in dollars per share)		$ 25
Annual dividends on preferred units (in dollars per share)		$ 1
SL Green Operating Partnership | Series Q Preferred Units
Organization
Shares of common stock reserved for issuance upon redemption of units of limited partnership interest in operating partnership (shares) | shares		268,000
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Number of preferred units issued (in shares) | shares						268,000
Dividend rate preferred units (as a percent)		3.50%
Liquidation preference of preferred units (in dollars per share)		$ 25
Annual dividends on preferred units (in dollars per share)		0.875
Operating partnership common stock value use for conversion of preferred units (in dollars per share)		$ 148.95
SL Green Operating Partnership | Series R Preferred Units
Organization
Shares of common stock reserved for issuance upon redemption of units of limited partnership interest in operating partnership (shares) | shares		400,000
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Number of preferred units issued (in shares) | shares					400,000
Dividend rate preferred units (as a percent)		3.50%
Liquidation preference of preferred units (in dollars per share)		$ 25
Annual dividends on preferred units (in dollars per share)		0.875
Operating partnership common stock value use for conversion of preferred units (in dollars per share)		$ 154.89
SL Green Operating Partnership | Series S Preferred Units
Organization
Shares of common stock reserved for issuance upon redemption of units of limited partnership interest in operating partnership (shares) | shares		1,077,280
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Number of preferred units issued (in shares) | shares					1,077,280
Dividend rate preferred units (as a percent)		4.00%
Liquidation preference of preferred units (in dollars per share)		$ 25
Annual dividends on preferred units (in dollars per share)		$ 1
SL Green Operating Partnership | Series T Preferred Units
Organization
Shares of common stock reserved for issuance upon redemption of units of limited partnership interest in operating partnership (shares) | shares		230,000
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Number of preferred units issued (in shares) | shares		230,000
Dividend rate preferred units (as a percent)		2.75%
Liquidation preference of preferred units (in dollars per share)		$ 25
Annual dividends on preferred units (in dollars per share)		0.6875
Operating partnership common stock value use for conversion of preferred units (in dollars per share)		$ 119.02
SL Green Operating Partnership | Series U Preferred Units
Organization
Shares of common stock reserved for issuance upon redemption of units of limited partnership interest in operating partnership (shares) | shares		680,000
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Number of preferred units issued (in shares) | shares		680,000
Dividend rate preferred units (as a percent)		4.50%
Liquidation preference of preferred units (in dollars per share)		$ 25
Annual dividends on preferred units (in dollars per share)		1.125
SL Green Operating Partnership | Series U Preferred Units | Minimum
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Annual dividends on preferred units (in dollars per share)		$ 0.75
SL Green Operating Partnership | Series A Preferred Units
Organization
Shares of common stock reserved for issuance upon redemption of units of limited partnership interest in operating partnership (shares) | shares		109,161
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Number of preferred units issued (in shares) | shares					109,161
Dividend rate preferred units (as a percent)		3.50%
Liquidation preference of preferred units (in dollars per share)		$ 1,000
Annual dividends on preferred units (in dollars per share)		$ 35
SL Green Operating Partnership | Series B Preferred Units
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Number of preferred units issued (in shares) | shares		0

Noncontrolling Interests on t76

Noncontrolling Interests on the Company's Consolidated Financial Statements (Common Unit Activity) (Details) - SL Green Operating Partnership - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Rollforward Analysis of Preferred Unit Activity
Issuance of units	$ 18,140	$ 30,506
Redemption of units	(7,152)	(55,697)
Preferred Units
Rollforward Analysis of Preferred Unit Activity
Balance at beginning of period	282,516	71,115
Issuance of units	22,793	211,601
Redemption of units	(440)	(200)
Balance at end of period	$ 304,869	$ 282,516

Stockholders' Equity of the C77

Stockholders' Equity of the Company (Details) - $ / shares	Mar. 31, 2016	Dec. 31, 2015
Stockholders' Equity Note [Abstract]
Authorized capital stock (shares)	260,000,000
Authorized shares, par value (in dollars per share)	$ 0.01
Common stock, shares authorized (in shares)	160,000,000	160,000,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Excess stock, shares authorized (shares)	75,000,000
Excess stock, par value (in dollars per share)	$ 0.01
Preferred stock, shares authorized (shares)	25,000,000
Preferred stock, par value (in dollars per share)	$ 0.01
Shares issued (shares)	100,081,448
Excess shares issued (shares)	0

Stockholders' Equity of the C78

Stockholders' Equity of the Company (At-the-Market Equity Offering Program and Perpetual Preferred Stock)(Details) - USD ($)	1 Months Ended	3 Months Ended		12 Months Ended
	Aug. 31, 2012	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Feb. 28, 2015	Jun. 30, 2014	Jul. 31, 2011
Stockholders' Equity
Proceeds from sale of common stock		$ 0	$ 120,597,000
Common stock, shares authorized (in shares)		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 (up to)							$ 300,000,000	$ 250,000,000
Contributions - net proceeds from common stock offering (in shares)			895,956		25,659
Proceeds from sale of common stock			$ 113,400,000		$ 2,800,000
New At-the-Market Equity offering programs
Stockholders' Equity
Aggregate value of the shares of common stock to be sold (up to)			$ 300,000,000
Contributions - net proceeds from common stock offering (in shares)				91,180	1,626,999
Proceeds from sale of common stock				$ 12,000,000	$ 182,900,000
Series I Preferred Stock
Stockholders' Equity
Preferred stock, shares outstanding (in shares)		9,200,000		9,200,000
Dividend rate preferred units (as a percent)		6.50%
Perpetual Preferred stock, liquidation preference (in dollars per share)		$ 25		$ 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
Common stock, shares authorized (in shares)						3,500,000

Stockholders' Equity of the C79

Stockholders' Equity of the Company (Earnings per Share)(Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Basic Earnings:
Income attributable to SL Green common stockholders	$ 23,221	$ 43,277
Diluted Earnings:
Income attributable to SL Green common stockholders	$ 24,143	$ 45,020
Basic Shares:
Weighted average common shares outstanding (shares)	100,051,000	98,402,000
Effect of Dilutive Securities:
Operating Partnership units redeemable for common shares (shares)	3,974,000	3,964,000
Stock-based compensation plans (shares)	234,000	653,000
Diluted weighted average common stock outstanding (shares)	104,259,000	103,019,000
Common stock shares excluded from the diluted shares outstanding (shares)	1,349,019	203,975
Common Stock
Effect of Dilutive Securities:
Redemption of units to common shares	$ 922	$ 1,743

Partners' Capital of the Oper80

Partners' Capital of the Operating Partnership (Details)	Mar. 31, 2016unitshares	Dec. 31, 2015unitshares
Common Stock
Stockholders' Equity
Units outstanding (units)	100,081,000	99,976,000
SL Green Operating Partnership
Stockholders' Equity
Noncontrolling interest in the operating partnership (as a percent)	3.84%	3.61%
Number of units of operating partnership owned by the noncontrolling interest unit holders (units) | unit	4,000,632	3,745,766
SL Green Operating Partnership | Series I Preferred Units
Stockholders' Equity
Units outstanding (units)	9,200,000
SL Green Operating Partnership | Common Stock
Stockholders' Equity
Units outstanding (units)	100,081,448

Partners' Capital of the Oper81

Partners' Capital of the Operating Partnership (EPS) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Stockholders' Equity
Income attributable to SL Green common stockholders	$ 23,221	$ 43,277
Weighted average common shares outstanding (shares)	100,051,000	98,402,000
Common stock shares excluded from the diluted shares outstanding (shares)	1,349,019	203,975
SL Green Operating Partnership
Stockholders' Equity
Income attributable to SL Green common stockholders	$ 24,143	$ 45,020
Weighted average common shares outstanding (shares)	104,025,000	102,366,000
Stock-based compensation plans (shares)	234,000	653,000
Diluted weighted average common units outstanding (shares)	104,259,000	103,019,000

Share-based Compensation (Addit

Share-based Compensation (Additional Information) (Details)

1 Months Ended

3 Months Ended

12 Months Ended

Jan. 31, 2015USD ($)

Aug. 31, 2014shares

Aug. 31, 2011USD ($)

Mar. 31, 2016USD ($)unit / sharesfungible_unit$ / sharesshares

Mar. 31, 2015USD ($)

Dec. 31, 2015USD ($)shares

Dec. 31, 2014shares

Sep. 30, 2014shares

Jun. 30, 2014shares

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]

Capitalized to assets associated with compensation expense related to our long-term compensation plans, restricted stock and stock options

$ 1,500,000

$ 1,600,000

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 6 months

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

3 years 1 month 6 days

Total unrecognized compensation cost related to unvested stock awards

$ 12,600,000

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 period

$ 84,531

$ 9,522,613

Stock options | Minimum

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

Award expiration period (in years)

5 years

Options vesting period (in years)

1 year

Stock options | Maximum

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

Award expiration period (in years)

10 years

Options vesting period (in years)

5 years

Restricted Stock Awards

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

Compensation expense

$ 2,016,554

7,540,747

Total unrecognized compensation cost related to unvested stock awards

$ 18,600,000

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

2 years 6 months

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

15.00%

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

35.00%

Fair value of restricted stock vested during the period

$ 7,300,000

7,400,000

Weighted average fair value of options granted during the period

$ 93,840

$ 16,061,201

Awards granted (in shares) | shares

1,000

143,053

Awards outstanding (in shares) | shares

3,134,281

3,137,881

3,000,979

LTIP units

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

Weighted average fair value of options granted during the period

$ 27,400,000

$ 25,400,000

Performance Shares

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

Total unrecognized compensation cost related to unvested stock awards

$ 11,200,000

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

1 year 4 months 24 days

Share-based Compensation

$ 9,500,000

13,200,000

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

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

2.76

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

17,130,000

Fungible units | fungible_unit

500,000

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

$ 2,000,000

2,000,000

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

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

Award expiration period (in years)

10 years

2010 Notional Unit Long-Term Compensation Plan

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

Capitalized to assets associated with compensation expense related to our long-term compensation plans, restricted stock and stock options

$ 31,700,000

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

$ 25,000,000

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

$ 25,000,000

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

50.00%

LTIP units earned (in shares) | shares

327,416

327,416

385,583

Percentage of LTIP Units earned, vested (percent)

25.00%

50.00%

2010 Notional Unit Long-Term Compensation Plan | Minimum

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

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

$ 15,000,000

2010 Notional Unit Long-Term Compensation Plan | Maximum

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

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

$ 75,000,000

2011 Outperformance Plan

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

Compensation expense

$ 0

700,000

Capitalized to assets associated with compensation expense related to our long-term compensation plans, restricted stock and stock options

26,700,000

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

$ 85,000,000

LTIP units earned (in shares) | shares

280,454

560,908

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

10.00%

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

3 years

Cumulative return to stockholders (percent)

25.00%

Return to stockholders

$ 85,000,000

Performance period (in years)

3 years

2011 Outperformance Plan | Earned anytime after beginning of the second year

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

Percentage of units vested

33.33%

2011 Outperformance Plan | Earned anytime after beginning of the third year

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

Percentage of units vested

66.67%

2011 Outperformance Plan | Vested on August 31, 2014

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

Percentage of units vested

50.00%

2011 Outperformance Plan | Vesting on August 31, 2015

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

Percentage of units vested

50.00%

2014 Outperformance Plan

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

Compensation expense

1,500,000

$ 1,400,000

Capitalized to assets associated with compensation expense related to our long-term compensation plans, restricted stock and stock options

27,900,000

LTIP units earned (in shares) | shares

610,000

Performance period (in years)

3 years

Award period (in years)

3 years

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

66.67%

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

33.33%

2014 Outperformance Plan | Vesting on August 31, 2017

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

Percentage of units vested

50.00%

2014 Outperformance Plan | Vesting on August 31, 2018

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

Percentage of units vested

50.00%

Deferred Stock Compensation Plan for Directors

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

Compensation expense

$ 1,600,000

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

100.00%

Awards granted (in shares) | shares

6,319

Shares issued (in shares) | shares

8,436

Awards outstanding (in shares) | shares

87,087

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%

Shares of common stock issued (shares) | shares

89,148

Share-based Compensation (Detai

Share-based Compensation (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Stock options
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Dividend yield (as a percent)	2.30%	1.97%
Expected life of option (in years)	3 years 6 months	3 years 7 months 6 days
Risk-free interest rate (as a percent)	1.27%	1.43%
Expected stock price volatility (as a percent)	31.00%	32.34%
Options Outstanding
Balance at beginning of period (in shares)	1,595,007	1,462,726
Granted (in shares)	4,500	389,836
Exercised (in shares)	(17,250)	(217,438)
Lapsed or cancelled (in shares)	(15,800)	(40,117)
Balance at end of period (in shares)	1,566,457	1,595,007
Options exercisable at end of period (in shares)	921,240	589,055
Weighted average fair value of options granted during the period	$ 84,531	$ 9,522,613
Weighted Average Exercise Price
Balance at beginning of year (in dollars per share)	$ 95.52	$ 87.98
Granted (in dollars per share)	94.75	112.54
Exercised (in dollars per share)	72.41	74.69
Lapsed or cancelled (in dollars per share)	113.59	98.61
Balance at end of period (in dollars per share)	95.59	95.52
Options exercisable at end of period (in dollars per share)	$ 88.23	$ 89.85
Restricted Stock Awards
Options Outstanding
Weighted average fair value of options granted during the period	$ 93,840	$ 16,061,201
Summary of restricted stock
Balance at beginning of year (in shares)	3,137,881	3,000,979
Granted (in shares)	1,000	143,053
Cancelled (in shares)	(4,600)	(6,151)
Balance at end of period (in shares)	3,134,281	3,137,881
Vested during the period (in shares)	81,172	87,081
Compensation expense recorded	$ 2,016,554	$ 7,540,747

Accumulated Other Comprehensi84

Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) of the Company [Roll Forward]
Beginning Balance	$ (8,749)
Ending Balance	(17,222)
SL Green Realty Corp
Accumulated Other Comprehensive Income (Loss) of the Company [Roll Forward]
Beginning Balance	(8,749)
Other comprehensive loss before reclassifications	(10,503)
Amounts reclassified from accumulated other comprehensive income	2,030
Ending Balance	(17,222)
Deferred net losses from terminated hedges	9,200	$ 9,700
SL Green Realty Corp | Net unrealized (loss) gain on derivative instruments
Accumulated Other Comprehensive Income (Loss) of the Company [Roll Forward]
Beginning Balance	(10,160)
Other comprehensive loss before reclassifications	(6,651)
Amounts reclassified from accumulated other comprehensive income	2,080
Ending Balance	(14,731)
SL Green Realty Corp | Unrealized gain (loss) on marketable securities
Accumulated Other Comprehensive Income (Loss) of the Company [Roll Forward]
Beginning Balance	2,003
Other comprehensive loss before reclassifications	(1,194)
Amounts reclassified from accumulated other comprehensive income	0
Ending Balance	809
SL Green Realty Corp | Joint venture | Net unrealized (loss) gain on derivative instruments
Accumulated Other Comprehensive Income (Loss) of the Company [Roll Forward]
Beginning Balance	(592)
Other comprehensive loss before reclassifications	(2,658)
Amounts reclassified from accumulated other comprehensive income	(50)
Ending Balance	$ (3,300)

Fair Value Measurements (Detail

Fair Value Measurements (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Fair Value of Financial Instruments
Marketable securities	$ 43,915	$ 45,138
Interest rate cap and swap agreements (included in other assets)	6	204
Debt and preferred equity investments	1,378,616	1,670,020
Secured Debt, Bearing Fixed Interest, Amount	5,990,813	5,816,010
Secured Debt, Bearing Variable Interest, Amount	1,130,887	1,205,494
Accrued Interest Payable And Other Liabilities
Fair Value of Financial Instruments
Interest rate cap and swap agreements	2,600	10,776
Liabilities Held for Sale
Fair Value of Financial Instruments
Interest rate cap and swap agreements	12,077
388-390 Greenwich Street
Fair Value of Financial Instruments
Secured Debt, Bearing Fixed Interest, Amount	1,004,000	1,004,000
Secured Debt, Bearing Variable Interest, Amount	446,000	446,000
388-390 Greenwich Street | Liabilities Held for Sale
Fair Value of Financial Instruments
Secured Debt, Bearing Fixed Interest, Amount	1,000,000
Secured Debt, Bearing Variable Interest, Amount	446,000
Carrying Value
Fair Value of Financial Instruments
Debt and preferred equity investments	1,378,616
Fixed rate debt	7,154,930	7,232,254
Variable rate debt	2,908,887	3,202,494
Total	10,063,817	10,434,748
Fair Value
Fair Value of Financial Instruments
Marketable securities	43,915	45,138
Total	10,412,799	10,770,574
Estimated fair value of debt and preferred equity investments, low end of range	1,400,000	1,700,000
Estimated fair value of debt and preferred equity investments, high end of range	1,500,000	1,800,000
Level 1
Fair Value of Financial Instruments
Interest rate cap and swap agreements (included in other assets)	0	0
Level 1 | Accrued Interest Payable And Other Liabilities
Fair Value of Financial Instruments
Interest rate cap and swap agreements	0	0
Level 1 | Liabilities Held for Sale
Fair Value of Financial Instruments
Interest rate cap and swap agreements	0
Level 2
Fair Value of Financial Instruments
Interest rate cap and swap agreements (included in other assets)	6	204
Level 2 | Accrued Interest Payable And Other Liabilities
Fair Value of Financial Instruments
Interest rate cap and swap agreements	2,600	10,776
Level 2 | Liabilities Held for Sale
Fair Value of Financial Instruments
Interest rate cap and swap agreements	12,077
Level 3
Fair Value of Financial Instruments
Marketable securities	0	0
Interest rate cap and swap agreements (included in other assets)	0	0
Level 3 | Accrued Interest Payable And Other Liabilities
Fair Value of Financial Instruments
Interest rate cap and swap agreements	0	0
Level 3 | Liabilities Held for Sale
Fair Value of Financial Instruments
Interest rate cap and swap agreements	0
Level 3 | Fair Value
Fair Value of Financial Instruments
Fixed rate debt	7,507,340	7,591,388
Variable rate debt	2,905,459	3,179,186
Equity marketable securities
Fair Value of Financial Instruments
Marketable securities	4,132	4,704
Equity marketable securities | Level 1
Fair Value of Financial Instruments
Marketable securities	4,132	4,704
Commercial mortgage-backed securities
Fair Value of Financial Instruments
Marketable securities	39,783	40,434
Commercial mortgage-backed securities | Level 2
Fair Value of Financial Instruments
Marketable securities	$ 39,783	$ 40,434

Financial Instruments_ Deriva86

Financial Instruments: Derivatives and Hedging (Details) - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Financial Instruments: Derivatives and Hedging
Fair Value	$ 6,000		$ 204,000
Derivative, Fair Value, Net	(2,594,000)
Derivative, Fair Value, Net, Including Derivatives Related to Assets Held for Sale	(14,671,000)
Gain (loss) from changes in fair value	37,000	$ 1,000
Fair value of derivatives in a net liability position	15,100,000
Aggregate termination value	15,100,000
Estimated current balance held in accumulated other comprehensive loss to be reclassified into earnings within the next 12 months	6,500,000
Share of joint venture of accumulated other comprehensive loss reclassified into equity in net income from unconsolidated joint ventures within the next 12 months	1,700,000
Amount of (Loss) Gain Recognized in Other Comprehensive Loss (Effective Portion)	(9,684,000)	(8,758,000)
Amount of Loss Reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion)	2,514,000	3,078,000
Amount of (Loss) or Gain Recognized into Income (Ineffective Portion)	(475,000)	(426,000)
Joint venture
Financial Instruments: Derivatives and Hedging
Amount of (Loss) Gain Recognized in Other Comprehensive Loss (Effective Portion)	(2,765,000)	(1,237,000)
Amount of Loss Reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion)	351,000	331,000
Amount of (Loss) or Gain Recognized into Income (Ineffective Portion)	(436,000)	(16,000)
Related to assets held for sale
Financial Instruments: Derivatives and Hedging
Derivative, Fair Value, Net	(12,077,000)
Interest Rate Cap- Sold Expiring in May 2016
Financial Instruments: Derivatives and Hedging
Notional Value	$ 504,000,000
Strike Rate (as a percent)	4.75%
Fair Value	$ 0
Interest Rate Cap- Sold Expiring in May 2016
Financial Instruments: Derivatives and Hedging
Notional Value	$ 500,000,000
Strike Rate (as a percent)	4.75%
Fair Value	$ 0
Interest Rate Cap Expiring October 2016
Financial Instruments: Derivatives and Hedging
Notional Value	$ 117,392,000
Strike Rate (as a percent)	6.00%
Fair Value	$ 0
Interest Rate Swap Expiring in December 2017
Financial Instruments: Derivatives and Hedging
Notional Value	$ 200,000,000
Strike Rate (as a percent)	0.9375%
Fair Value	$ (985,000)
Interest Rate Swap Expiring in December 2017
Financial Instruments: Derivatives and Hedging
Notional Value	$ 150,000,000
Strike Rate (as a percent)	0.94%
Fair Value	$ (743,000)
Interest Rate Swap Expiring in December 2017
Financial Instruments: Derivatives and Hedging
Notional Value	$ 150,000,000
Strike Rate (as a percent)	0.94%
Fair Value	$ (743,000)
Interest Rate Swap Expiring in June 2016
Financial Instruments: Derivatives and Hedging
Notional Value	$ 30,000,000
Strike Rate (as a percent)	2.295%
Fair Value	$ (109,000)
Interest Rate Swap Expiring in January 2017
Financial Instruments: Derivatives and Hedging
Notional Value	$ 14,409,000
Strike Rate (as a percent)	0.50%
Fair Value	$ 5,000
Interest Rate Swap Expiring in February 2017
Financial Instruments: Derivatives and Hedging
Notional Value	$ 8,018,000
Strike Rate (as a percent)	0.852%
Fair Value	$ (20,000)
Interest Rate Cap Expiring in September 2017
Financial Instruments: Derivatives and Hedging
Notional Value	$ 137,500,000
Strike Rate (as a percent)	4.00%
Fair Value	$ 1,000
Interest Rate Cap Expiring in May 2016 | Related to assets held for sale
Financial Instruments: Derivatives and Hedging
Notional Value	$ 504,000,000
Strike Rate (as a percent)	4.75%
Fair Value	$ 0
Interest Rate Cap Expiring In May 2016 | Related to assets held for sale
Financial Instruments: Derivatives and Hedging
Notional Value	$ 500,000,000
Strike Rate (as a percent)	4.75%
Fair Value	$ 0
Interest Rate Cap Expiring In May 2016 | Related to assets held for sale
Financial Instruments: Derivatives and Hedging
Notional Value	$ 446,000,000
Strike Rate (as a percent)	4.75%
Fair Value	$ 0
Interest Rate Swap Expiring in December 2017 | Related to assets held for sale
Financial Instruments: Derivatives and Hedging
Notional Value	$ 144,000,000
Strike Rate (as a percent)	2.236%
Fair Value	$ (3,902,000)
Interest Rate Swap Expiring in December 2017 | Related to assets held for sale
Financial Instruments: Derivatives and Hedging
Notional Value	$ 86,400,000
Strike Rate (as a percent)	1.9475%
Fair Value	$ (1,916,000)
Interest Rate Swap Expiring in December 2017 | Related to assets held for sale
Financial Instruments: Derivatives and Hedging
Notional Value	$ 72,000,000
Strike Rate (as a percent)	2.31%
Fair Value	$ (2,042,000)
Interest Rate Swap Expiring in December 2017 | Related to assets held for sale
Financial Instruments: Derivatives and Hedging
Notional Value	$ 72,000,000
Strike Rate (as a percent)	1.345%
Fair Value	$ (856,000)
Interest Rate Swap Expiring in December 2017 | Related to assets held for sale
Financial Instruments: Derivatives and Hedging
Notional Value	$ 72,000,000
Strike Rate (as a percent)	2.31%
Fair Value	$ (2,042,000)
Interest Rate Swap Expiring in December 2017 | Related to assets held for sale
Financial Instruments: Derivatives and Hedging
Notional Value	$ 57,600,000
Strike Rate (as a percent)	1.99%
Fair Value	$ (1,319,000)
Interest Rate Swaps/Caps
Financial Instruments: Derivatives and Hedging
Amount of (Loss) Gain Recognized in Other Comprehensive Loss (Effective Portion)	(6,919,000)	(7,521,000)
Amount of Loss Reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion)	2,163,000	2,747,000
Amount of (Loss) or Gain Recognized into Income (Ineffective Portion)	$ (39,000)	$ (410,000)

Commitments and Contingencies87

Commitments and Contingencies (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2016USD ($)
Commitments and Contingencies Disclosure [Abstract]
Initial term of non cancellable operating leases, minimum (in years)	1 year
Capital lease
Remaining 2,016	$ 1,705
2,017	2,387
2,018	2,387
2,019	2,411
2,020	2,620
Thereafter	825,483
Total minimum lease payments	836,993
Amount representing interest	(795,439)
Capital lease obligations	41,554
Non-cancellable operating leases
Remaining 2,016	23,142
2,017	31,049
2,018	31,049
2,019	31,066
2,020	31,436
Thereafter	764,352
Total minimum lease payments	$ 912,094

Segment Information (Details)

Segment Information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2016USD ($)segment	Mar. 31, 2015USD ($)	Dec. 31, 2015USD ($)
Segment information
Number of reportable segments (segment) | segment	2
Total revenues	$ 455,444	$ 396,299
Income from continuing operations before equity in net gain on sale of interest in unconsolidated joint venture/real estate and gain on sale of real estate	8,815	42,226
Total assets	19,585,968		$ 19,727,646
Marketing, general and administrative	24,032	25,464
Operating Segments | Real Estate Segment
Segment information
Total revenues	400,707	354,230
Income from continuing operations before equity in net gain on sale of interest in unconsolidated joint venture/real estate and gain on sale of real estate	(39,031)	6,759
Total assets	18,195,830		18,045,370
Operating Segments | Debt and Preferred Equity Segment
Segment information
Total revenues	54,737	42,069
Income from continuing operations before equity in net gain on sale of interest in unconsolidated joint venture/real estate and gain on sale of real estate	47,846	$ 35,467
Total assets	$ 1,390,138		$ 1,682,276

Segment Information (Schedule o

Segment Information (Schedule of Reconciliation of Income from Continuing Operations to Net Income Attributable to SL Green Common Stockholders)(Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Reconciliation of income from continuing operations to net income attributable to SL Green common stockholders
Income from continuing operations before equity in net gain on sale of interest in unconsolidated joint venture/real estate and gain on sale of real estate	$ 8,815	$ 42,226
Equity in net gain on sale of interest in unconsolidated joint venture/real estate	9,915	0
Gain on sale of real estate, net	13,773	0
Income from continuing operations	32,503	42,226
Net income from discontinued operations	0	427
Gain on sale of discontinued operations	0	12,983
Net income	$ 32,503	$ 55,636