SL Green Operating Partnership 10-Q 11 Aug 14 2014 Q2 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	6 Months Ended
	Jun. 30, 2014	Jul. 31, 2014
Document Information [Line Items]	'	'
Entity Registrant Name	'SL GREEN REALTY CORP	'
Entity Central Index Key	'0001040971	'
Current Fiscal Year End Date	'--12-31	'
Entity Filer Category	'Large Accelerated Filer	'
Document Type	'10-Q	'
Document Period End Date	30-Jun-14	'
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q2	'
Amendment Flag	'false	'
Entity Common Stock, Shares Outstanding (shares)	'	95,599,482
SL Green Operating Partnership	'	'
Document Information [Line Items]	'	'
Entity Registrant Name	'SL GREEN OPERATING PARTNERSHIP, LP.	'
Entity Central Index Key	'0001492869	'
Current Fiscal Year End Date	'--12-31	'
Entity Filer Category	'Non-accelerated Filer	'
Document Type	'10-Q	'
Document Period End Date	30-Jun-14	'
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q2	'
Amendment Flag	'false	'
Entity Common Stock, Shares Outstanding (shares)	'	876,199

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Commercial real estate properties, at cost:	'	'
Land and land interests	$3,466,587	$3,032,526
Building and improvements	8,843,315	7,884,663
Building leasehold and improvements	1,390,004	1,366,281
Properties under capital lease	27,445	50,310
Total commercial real estate properties, at cost	13,727,351	12,333,780
Less: accumulated depreciation	-1,769,428	-1,646,240
Total commercial real estate properties, net	11,957,923	10,687,540
Assets held for sale	339,809	0
Cash and cash equivalents	308,103	206,692
Restricted cash	157,225	142,051
Investment in marketable securities	39,912	32,049
Tenant and other receivables, net of allowance of $20,026 and $17,325 in 2014 and 2013, respectively	51,844	60,393
Related party receivables	8,915	8,530
Deferred rents receivable, net of allowance of $27,616 and $30,333 in 2014 and 2013, respectively	354,388	386,508
Debt and preferred equity investments, net of discounts and deferred origination fees of $14,633 and $18,593 in 2014 and 2013, respectively, and allowance of $1,000 in 2013	1,547,808	1,304,839
Investments in unconsolidated joint ventures	971,926	1,113,218
Deferred costs, net	300,043	267,058
Other assets	679,840	750,123
Total assets	16,717,736	14,959,001
Liabilities	'	'
Mortgages and other loans payable	5,939,176	4,860,578
Revolving credit facility	0	220,000
Term loan and senior unsecured notes	2,127,206	1,739,330
Accrued interest payable and other liabilities	128,730	114,622
Accounts payable and accrued expenses	164,215	145,889
Deferred revenue	223,394	263,261
Capitalized lease obligations	20,635	47,671
Deferred land leases payable	1,044	22,185
Dividend and distributions payable	53,193	52,255
Security deposits	65,166	61,308
Liabilities related to assets held for sale	193,375	0
Junior subordinated deferrable interest debentures held by trusts that issued trust preferred securities	100,000	100,000
Total liabilities	9,016,134	7,627,099
Commitments and contingencies	0	0
Noncontrolling interests in the Operating Partnership	379,805	265,476
Preferred Units	49,550	49,550
Equity	'	'
Common stock, $0.01 par value, 160,000 shares authorized and 99,188 and 98,563 issued and outstanding at June 30, 2014 and December 31, 2013, respectively (including 3,601 and 3,570 shares held in Treasury at June 30, 2014 and December 31, 2013, respectively)	993	986
Additional paid-in-capital	5,085,965	5,015,904
Treasury stock at cost	-320,152	-317,356
Accumulated other comprehensive loss	-6,196	-15,211
Retained earnings	1,797,580	1,619,150
Total SL Green stockholders' equity	6,780,122	6,525,405
Noncontrolling interests in other partnerships	492,125	491,471
Total equity	7,272,247	7,016,876
Total liabilities and equity	16,717,736	14,959,001
Series I Preferred Stock	'	'
Equity	'	'
Series I Preferred Stock, $0.01 par value, $25.00 liquidation preference, 9,200 issued and outstanding at both June 30, 2014 and December 31, 2013	221,932	221,932
SL Green Operating Partnership	'	'
Commercial real estate properties, at cost:	'	'
Land and land interests	3,466,587	3,032,526
Building and improvements	8,843,315	7,884,663
Building leasehold and improvements	1,390,004	1,366,281
Properties under capital lease	27,445	50,310
Total commercial real estate properties, at cost	13,727,351	12,333,780
Less: accumulated depreciation	-1,769,428	-1,646,240
Total commercial real estate properties, net	11,957,923	10,687,540
Assets held for sale	339,809	0
Cash and cash equivalents	308,103	206,692
Restricted cash	157,225	142,051
Investment in marketable securities	39,912	32,049
Tenant and other receivables, net of allowance of $20,026 and $17,325 in 2014 and 2013, respectively	51,844	60,393
Related party receivables	8,915	8,530
Deferred rents receivable, net of allowance of $27,616 and $30,333 in 2014 and 2013, respectively	354,388	386,508
Debt and preferred equity investments, net of discounts and deferred origination fees of $14,633 and $18,593 in 2014 and 2013, respectively, and allowance of $1,000 in 2013	1,547,808	1,304,839
Investments in unconsolidated joint ventures	971,926	1,113,218
Deferred costs, net	300,043	267,058
Other assets	679,840	750,123
Total assets	16,717,736	14,959,001
Liabilities	'	'
Mortgages and other loans payable	5,939,176	4,860,578
Revolving credit facility	0	220,000
Term loan and senior unsecured notes	2,127,206	1,739,330
Accrued interest payable and other liabilities	128,730	114,622
Accounts payable and accrued expenses	164,215	145,889
Deferred revenue	223,394	263,261
Capitalized lease obligations	20,635	47,671
Deferred land leases payable	1,044	22,185
Dividend and distributions payable	53,193	52,255
Security deposits	65,166	61,308
Liabilities related to assets held for sale	193,375	0
Junior subordinated deferrable interest debentures held by trusts that issued trust preferred securities	100,000	100,000
Total liabilities	9,016,134	7,627,099
Commitments and contingencies	0	0
Preferred Units	49,550	49,550
Equity	'	'
Accumulated other comprehensive loss	-6,413	-15,662
Total liabilities and equity	16,717,736	14,959,001
SLGOP partners' capital:	'	'
SL Green partners' capital 991 and 979 general partner common units and 94,596 and 94,014 limited partner common units outstanding at June 30, 2014 and December 31, 2013, respectively)	6,860,374	6,506,747
Limited partner interests in SLGOP (3,500 and 2,902 limited partner common units outstanding at June 30, 2014 and December 31, 2013, respectively)	84,034	77,864
Total SLGOP partners' capital	7,159,927	6,790,881
Noncontrolling interests in other partnerships	492,125	491,471
Total capital	7,652,052	7,282,352
SL Green Operating Partnership | Series I Preferred Stock	'	'
SLGOP partners' capital:	'	'
Series I Preferred Units, $25.00 liquidation preference, 9,200 outstanding at both June 30, 2014 and December 31, 2013	221,932	221,932
Total capital	$221,932	$221,932

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, except Share data, unless otherwise specified
Tenant and other receivables, allowance (in dollars)	$20,026	$17,325
Deferred rents receivable, allowance (in dollars)	27,616	30,333
Debt and preferred equity investments, discount (in dollars)	14,633	18,593
Debt and preferred equity investments, allowance (in dollars)	0	1,000
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 (shares)	160,000,000	160,000,000
Common stock, shares issued (shares)	99,188,000	98,563,000
Common stock, shares outstanding (shares)	99,188,000	98,563,000
Treasury stock, shares (shares)	3,601,000	3,570,000
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 (shares)	9,200,000	9,200,000
Preferred stock, shares outstanding (shares)	9,200,000	9,200,000
SL Green Operating Partnership	'	'
Tenant and other receivables, allowance (in dollars)	20,026	17,325
Deferred rents receivable, allowance (in dollars)	27,616	30,333
Debt and preferred equity investments, discount (in dollars)	14,633	18,593
Debt and preferred equity investments, allowance (in dollars)	$0	$1,000
SL Green partner's capital, general partner common units outstanding (shares)	991,000	979,000
SL Green partners' capital, limited partner common units outstanding (shares)	94,596,000	94,014,000
Limited partner interests in Operating Partnership, limited partner common units outstanding (shares)	3,500,000	2,902,000
SL Green Operating Partnership | Series I Preferred Stock	'	'
Preferred stock, liquidation preference (in dollars per share)	$25	$25
Preferred Units, shares issued (shares)	9,200,000	9,200,000
Preferred Units, shares outstanding (shares)	9,200,000	9,200,000

Consolidated_Statements_of_Inc

Consolidated Statements of Income (USD $)	3 Months Ended		6 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Revenues	'	'	'	'
Rental revenue, net	$285,234	$262,743	$551,755	$518,560
Escalation and reimbursement	39,529	38,747	79,912	78,551
Investment income	39,714	46,731	93,798	99,439
Other income	22,750	5,723	37,331	11,015
Total revenues	387,227	353,944	762,796	707,565
Expenses	'	'	'	'
Operating expenses, including $4,450 and $7,861 (2014) and $3,953 and $7,842 (2013) of related party expenses	70,675	68,611	144,160	139,780
Real estate taxes	53,267	51,749	108,583	104,203
Ground rent	8,040	7,930	16,073	16,058
Interest expense, net of interest income	78,611	79,551	156,330	157,860
Amortization of deferred financing costs	5,500	4,229	9,357	8,681
Depreciation and amortization	94,838	81,577	184,217	160,200
Transaction related costs, net of recoveries	1,697	1,706	4,171	3,085
Marketing, general and administrative	23,872	21,514	47,128	42,582
Total expenses	336,500	316,867	670,019	632,449
Income from continuing operations before equity in net income (loss) from unconsolidated joint ventures, equity in net gain (loss) on sale of interest in unconsolidated joint venture/real estate, purchase price fair value adjustment, loss on sale of investment in marketable securities and loss on early extinguishment of debt	50,727	37,077	92,777	75,116
Equity in net income (loss) from unconsolidated joint ventures	8,619	-3,761	14,748	1,313
Equity in net gain (loss) on sale of interest in unconsolidated joint venture/real estate	1,444	-3,583	106,084	-3,583
Purchase price fair value adjustment	71,446	-2,305	71,446	-2,305
Loss on sale of investment in marketable securities	0	-8	0	-65
Loss on early extinguishment of debt	-1,028	-10	-1,025	-18,523
Income from continuing operations	131,208	27,410	284,030	51,953
Net income from discontinued operations	4,389	3,838	8,178	8,519
Gain on sale of discontinued operations	114,735	0	114,735	1,113
Net income	250,332	31,248	406,943	61,585
Net income attributable to noncontrolling interests:	'	'	'	'
Noncontrolling interests in the Operating Partnership	-8,645	-244	-13,374	-799
Noncontrolling interests in other partnerships	-1,843	-3,004	-3,333	-5,905
Preferred units distribution	-565	-565	-1,130	-1,130
Net income attributable to SL Green	239,279	27,435	389,106	53,751
Preferred stock redemption costs	0	-12,160	0	-12,160
Perpetual preferred stock dividends	-3,738	-6,999	-7,475	-14,406
Net income attributable to SL Green common stockholders	235,541	8,276	381,631	27,185
Amounts attributable to SL Green common stockholders:	'	'	'	'
Income from continuing operations	50,346	10,268	91,361	23,549
Purchase price fair value adjustment	68,909	-2,240	69,027	-2,239
Equity in net gain (loss) on sale of interest in unconsolidated joint venture/real estate	1,393	-3,482	102,492	-3,481
Net income from discontinued operations	4,233	3,730	7,901	8,275
Gain on sale of discontinued operations	110,660	0	110,850	1,081
Net income attributable to SL Green common stockholders	235,541	8,276	381,631	27,185
Basic earnings per share:	'	'	'	'
Income from continuing operations before gains (loss) on sale and discontinued operations (usd per share)	$1.25	$0.09	$1.69	$0.23
Equity in net gain on sale of interest in unconsolidated joint venture/real estate (usd per share)	$0.02	($0.04)	$1.08	($0.03)
Net income from discontinued operations (usd per share)	$0.04	$0.04	$0.08	$0.09
Gain on sale of discontinued operations (usd per share)	$1.16	$0	$1.16	$0.01
Net income attributable to SL Green common stockholders (usd per share)	$2.47	$0.09	$4.01	$0.30
Diluted earnings per share:	'	'	'	'
Income from continuing operations before gains (loss) on sale and discontinued operations (usd per share)	$1.24	$0.09	$1.68	$0.23
Equity in net gain on sale of interest in unconsolidated joint venture/real estate (usd per share)	$0.02	($0.04)	$1.07	($0.03)
Net income from discontinued operations (usd per share)	$0.05	$0.04	$0.08	$0.09
Gain on sale of discontinued operations (usd per share)	$1.15	$0	$1.16	$0.01
Net income attributable to SL Green common stockholders (usd per share)	$2.46	$0.09	$3.99	$0.30
Dividends per share (usd per share)	$0.50	$0.33	$1	$0.66
Basic weighted average common shares outstanding (in shares)	95,455	91,660	95,288	91,530
Diluted weighted average common shares and common share equivalents outstanding (usd per share)	99,484	94,536	99,128	94,452
SL Green Operating Partnership	'	'	'	'
Revenues	'	'	'	'
Rental revenue, net	285,234	262,743	551,755	518,560
Escalation and reimbursement	39,529	38,747	79,912	78,551
Investment income	39,714	46,731	93,798	99,439
Other income	22,750	5,723	37,331	11,015
Total revenues	387,227	353,944	762,796	707,565
Expenses	'	'	'	'
Operating expenses, including $4,450 and $7,861 (2014) and $3,953 and $7,842 (2013) of related party expenses	70,675	68,611	144,160	139,780
Real estate taxes	53,267	51,749	108,583	104,203
Ground rent	8,040	7,930	16,073	16,058
Interest expense, net of interest income	78,611	79,551	156,330	157,860
Amortization of deferred financing costs	5,500	4,229	9,357	8,681
Depreciation and amortization	94,838	81,577	184,217	160,200
Transaction related costs, net of recoveries	1,697	1,706	4,171	3,085
Marketing, general and administrative	23,872	21,514	47,128	42,582
Total expenses	336,500	316,867	670,019	632,449
Income from continuing operations before equity in net income (loss) from unconsolidated joint ventures, equity in net gain (loss) on sale of interest in unconsolidated joint venture/real estate, purchase price fair value adjustment, loss on sale of investment in marketable securities and loss on early extinguishment of debt	50,727	37,077	92,777	75,116
Equity in net income (loss) from unconsolidated joint ventures	8,619	-3,761	14,748	1,313
Equity in net gain (loss) on sale of interest in unconsolidated joint venture/real estate	1,444	-3,583	106,084	-3,583
Purchase price fair value adjustment	71,446	-2,305	71,446	-2,305
Loss on sale of investment in marketable securities	0	-8	0	-65
Loss on early extinguishment of debt	-1,028	-10	-1,025	-18,523
Income from continuing operations	131,208	27,410	284,030	51,953
Net income from discontinued operations	4,389	3,838	8,178	8,519
Gain on sale of discontinued operations	114,735	0	114,735	1,113
Net income	250,332	31,248	406,943	61,585
Net income attributable to noncontrolling interests:	'	'	'	'
Noncontrolling interests in other partnerships	-1,843	-3,004	-3,333	-5,905
Net income attributable to SL Green	247,924	27,679	402,480	54,550
Preferred stock redemption costs	0	-12,160	0	-12,160
Net income attributable to SL Green common stockholders	244,186	8,520	395,005	27,984
Amounts attributable to SL Green common stockholders:	'	'	'	'
Income from continuing operations	52,172	10,570	94,562	24,240
Purchase price fair value adjustment	71,446	-2,305	71,446	-2,305
Equity in net gain (loss) on sale of interest in unconsolidated joint venture/real estate	1,444	-3,583	106,084	-3,583
Gain on sale of discontinued operations	114,735	0	114,735	1,113
Net income attributable to SL Green common stockholders	244,186	8,520	395,005	27,984
Basic earnings per share:	'	'	'	'
Equity in net gain on sale of interest in unconsolidated joint venture/real estate (usd per share)	$0.02	($0.04)	$1.08	($0.03)
Gain on sale of discontinued operations (usd per share)	$1.16	$0	$1.16	$0.01
Diluted earnings per share:	'	'	'	'
Equity in net gain on sale of interest in unconsolidated joint venture/real estate (usd per share)	$0.02	($0.04)	$1.07	($0.03)
Gain on sale of discontinued operations (usd per share)	$1.15	$0	$1.16	$0.01
Dividends per share (usd per share)	'	'	$1	'
Noncontrolling Interest [Abstract]	'	'	'	'
Preferred unit distributions	-565	-565	-1,130	-1,130
Perpetual preferred unit distributions	-3,738	-6,999	-7,475	-14,406
Net income attributable to SLGOP common unitholders	244,186	8,520	395,005	27,984
Net income from discontinued operations	$4,389	$3,838	$8,178	$8,519
Net income from continuing operations before gains (loss) on sale and discontinued operations (in dollars per share)	$1.25	$0.09	$1.69	$0.23
Net income from discontinued operations (in dollars per share)	$0.04	$0.04	$0.08	$0.09
Net income attributable to SLGOP common stockholders (in dollars per share)	$2.47	$0.09	$4.01	$0.30
Income from continuing operations before gains (loss) on sale and discontinued operations (in dollars per share)	$1.24	$0.09	$1.68	$0.23
Net income from discontinued operations (in dollars per share)	$0.05	$0.04	$0.08	$0.09
Net income attributable to SLGOP common stockholders (in dollars per share)	$2.46	$0.09	$3.99	$0.30
Dividends per unit (usd per share)	$0.50	$0.33	$1	$0.66
Basic weighted average common shares outstanding (in shares)	98,970	94,312	98,627	94,224
Diluted weighted average common shares and common share equivalents outstanding (in shares)	99,484	94,536	99,128	94,452

Consolidated_Statements_of_Inc1

Consolidated Statements of Income (Parenthetical) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Related party expenses included in Operating expenses	$4,450	$3,953	$7,861	$7,842
SL Green Operating Partnership	'	'	'	'
Related party expenses included in Operating expenses	$4,450	$3,953	$7,861	$7,842

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Net income	$250,332	$31,248	$406,943	$61,585
Other comprehensive income:	'	'	'	'
Change in net unrealized gain on derivative instruments, including our share of joint venture net unrealized gain on derivative instruments	7,293	9,799	7,461	11,687
Change in unrealized gain (loss) on marketable securities	1,659	-1,848	1,788	-207
Other comprehensive income	8,952	7,951	9,249	11,480
Comprehensive income	259,284	39,199	416,192	73,065
Net income attributable to noncontrolling interests	-11,053	-3,813	-17,837	-7,834
Other comprehensive income attributable to noncontrolling interests	-276	-456	-234	-515
Comprehensive income attributable to SL Green	247,955	34,930	398,121	64,716
SL Green Operating Partnership	'	'	'	'
Net income	250,332	31,248	406,943	61,585
Other comprehensive income:	'	'	'	'
Change in net unrealized gain on derivative instruments, including our share of joint venture net unrealized gain on derivative instruments	7,293	9,799	7,461	11,687
Change in unrealized gain (loss) on marketable securities	1,659	-1,848	1,788	-207
Other comprehensive income	8,952	7,951	9,249	11,480
Comprehensive income	259,284	39,199	416,192	73,065
Net income attributable to noncontrolling interests	-1,843	-3,004	-3,333	-5,905
Comprehensive income attributable to SL Green	$257,441	$36,195	$412,859	$67,160

Consolidated_Statements_of_Equ

Consolidated Statements of Equity (USD $)	Total	Common Stock	Additional Paid-In Capital	Treasury Stock	Accumulated Other Comprehensive Income (Loss)	Retained Earnings	Noncontrolling Interests	Series I Preferred Stock
In Thousands, except Share data, unless otherwise specified								Preferred Stock
Beginning Balance at Dec. 31, 2013	$7,016,876	$986	$5,015,904	($317,356)	($15,211)	$1,619,150	$491,471	$221,932
Shares outstanding (shares) at Dec. 31, 2013	'	94,993,000	'	'	'	'	'	'
Increase (Decrease) in Stockholders' Equity	'	'	'	'	'	'	'	'
Net income	392,439	'	'	'	'	389,106	3,333	'
Other comprehensive income	9,015	'	'	'	9,015	'	'	'
Preferred dividends	-7,475	'	'	'	'	-7,475	'	'
DRIP proceeds	26	'	26	'	'	'	'	'
Conversion of units of the Operating Partnership to common stock	23,066	2	23,064	'	'	'	'	'
Conversion of units of the Operating Partnership to common stock (in shares)	'	233,000	'	'	'	'	'	'
Reallocation of noncontrolling interest in the Operating Partnership	-107,925	'	'	'	'	-107,925	'	'
Deferred compensation plan and stock award, net	-1,390	0	1,406	-2,796	'	'	'	'
Deferred compensation plan and stock award, net (in shares)	'	2,000	'	'	'	'	'	'
Amortization of deferred compensation plan	17,069	'	17,069	'	'	'	'	'
Issuance of common stock	8,750	1	8,749	'	'	'	'	'
Issuance of common stock (shares)	'	82,000	'	'	'	'	'	'
Proceeds from stock options exercised	19,751	4	19,747	'	'	'	'	'
Proceeds from issuance of common stock (in shares)	'	277,000	'	'	'	'	'	'
Contributions to consolidated joint venture interest	1,673	'	'	'	'	'	1,673	'
Cash distributions to noncontrolling interests	-4,352	'	'	'	'	'	-4,352	'
Cash distributions declared ($1.00 per common share, none of which represented a return of capital for federal income tax purposes)	-95,276	'	'	'	'	-95,276	'	'
Ending Balance at Jun. 30, 2014	$7,272,247	$993	$5,085,965	($320,152)	($6,196)	$1,797,580	$492,125	$221,932
Shares outstanding (shares) at Jun. 30, 2014	'	95,587,000	'	'	'	'	'	'

Consolidated_Statements_of_Equ1

Consolidated Statements of Equity (Parenthetical) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Statement of Stockholders' Equity [Abstract]	'	'	'	'
Cash distribution declared, per common share (usd per share)	$0.50	$0.33	$1	$0.66

Consolidated_Statements_of_Cap

Consolidated Statements of Capital Statement (USD $)	3 Months Ended	6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2014
Increase (Decrease) in Stockholders' Equity	'	'
Other comprehensive income	$8,952	$9,249
DRIP proceeds	'	26
Redemption of units	'	23,066
Deferred compensation plan and stock award, net	'	-1,390
Amortization of deferred compensation plan	'	17,069
Contributions to consolidated joint venture interest	'	1,673
Cash distributions to noncontrolling interests	'	-4,352
Common Stock	'	'
Increase (Decrease) in Stockholders' Equity	'	'
Redemption of units	'	2
Redemption of units (in units)	'	233
Deferred compensation plan and stock award, net	'	0
Noncontrolling Interests	'	'
Increase (Decrease) in Stockholders' Equity	'	'
Contributions to consolidated joint venture interest	'	1,673
Cash distributions to noncontrolling interests	'	-4,352
SL Green Operating Partnership	'	'
Increase (Decrease) in Stockholders' Equity	'	'
Beginning Balance	'	7,282,352
Net income	'	405,813
Other comprehensive income	8,952	9,249
Preferred distributions	'	-7,475
Issuance of common units	'	19,460
DRIP proceeds	'	26
Redemption of units	'	0
Deferred compensation plan and stock award, net	'	-1,390
Amortization of deferred compensation plan	'	17,069
Contributions to consolidated joint venture interest	'	1,673
Contributionsbnet proceeds from common stock offering	'	8,750
Contributionsbproceeds from stock options exercised	'	19,751
Cash distributions to noncontrolling interests	'	-4,352
Cash distribution declared ($1.00 per common unit, none of which represented a return of capital for federal income tax purposes)	'	-98,874
Ending Balance	7,652,052	7,652,052
SL Green Operating Partnership | General Partner	'	'
Increase (Decrease) in Stockholders' Equity	'	'
Beginning Balance	'	6,506,747
Balance (shares)	'	94,993
Net income	'	381,631
DRIP proceeds	'	26
DRIP proceeds (in units)	'	0
Redemption of units	'	23,066
Redemption of units (in units)	'	233
Deferred compensation plan and stock award, net	'	-1,390
Deferred compensation plan and stock award, net (in units)	'	2
Amortization of deferred compensation plan	'	17,069
Contributionsbnet proceeds from common stock offering	'	8,750
Contributionsbnet proceeds from common stock offering (in units)	'	82
Contributionsbproceeds from stock options exercised	'	19,751
Contributionsbproceeds from stock options exercised (in units)	'	277
Cash distribution declared ($1.00 per common unit, none of which represented a return of capital for federal income tax purposes)	'	-95,276
Ending Balance	6,860,374	6,860,374
Balance (shares)	95,587	95,587
SL Green Operating Partnership | Limited Partners	'	'
Increase (Decrease) in Stockholders' Equity	'	'
Balance (shares)	'	2,902
Issuance of common units (in units)	'	833
Redemption of units (in units)	'	-235
Deferred compensation plan and stock award, net (in units)	'	'
Balance (shares)	3,500	3,500
SL Green Operating Partnership | Series I Preferred Stock	'	'
Increase (Decrease) in Stockholders' Equity	'	'
Beginning Balance	'	221,932
Net income	'	7,475
Preferred distributions	'	-7,475
Ending Balance	221,932	221,932
SL Green Operating Partnership | Common Stock | Limited Partners	'	'
Increase (Decrease) in Stockholders' Equity	'	'
Beginning Balance	'	77,864
Net income	'	13,374
Issuance of common units	'	19,460
Redemption of units	'	-23,066
Cash distribution declared ($1.00 per common unit, none of which represented a return of capital for federal income tax purposes)	'	-3,598
Ending Balance	84,034	84,034
SL Green Operating Partnership | Accumulated Other Comprehensive Income (Loss)	'	'
Increase (Decrease) in Stockholders' Equity	'	'
Beginning Balance	'	-15,662
Other comprehensive income	'	9,249
Ending Balance	-6,413	-6,413
SL Green Operating Partnership | Noncontrolling Interests	'	'
Increase (Decrease) in Stockholders' Equity	'	'
Beginning Balance	'	491,471
Net income	'	3,333
Contributions to consolidated joint venture interest	'	1,673
Cash distributions to noncontrolling interests	'	-4,352
Ending Balance	$492,125	$492,125

Consolidated_Statements_of_Cap1

Consolidated Statements of Capital (Parenthetical) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Cash distribution declared, per common share (usd per share)	$0.50	$0.33	$1	$0.66
SL Green Operating Partnership	'	'	'	'
Cash distribution declared, per common share (usd per share)	'	'	$1	'

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013
Operating Activities	'	'
Net income	$406,943	$61,585
Adjustments to reconcile net income to net cash provided by operating activities:	'	'
Depreciation and amortization	194,029	173,029
Equity in net income from unconsolidated joint ventures	-14,748	-1,313
Distributions of cumulative earnings from unconsolidated joint ventures	14,645	13,467
Equity in net (gain) loss on sale of interest in unconsolidated joint venture interest/real estate	-106,084	3,583
Purchase price fair value adjustment	71,446	-2,305
Depreciable real estate reserves	0	2,150
Gain on sale of discontinued operations	-114,735	-1,113
Loss on early extinguishment of debt	1,025	10,968
Deferred rents receivable	-26,727	-29,452
Other non-cash adjustments	-11,162	-28,675
Changes in operating assets and liabilities:	'	'
Restricted cashboperations	-4,850	6,127
Tenant and other receivables	5,890	4,896
Related party receivables	-853	768
Deferred lease costs	-10,688	-19,106
Other assets	-438	4,075
Accounts payable, accrued expenses and other liabilities and security deposits	12,973	1,793
Deferred revenue and deferred land leases payable	2,788	4,601
Net cash provided by operating activities	276,562	209,688
Investing Activities	'	'
Acquisitions of real estate property	-208,614	-52,534
Additions to land, buildings and improvements	-134,249	-61,531
Escrowed cashbcapital improvements/acquisition deposits	-38,227	-394
Investments in unconsolidated joint ventures	-170,532	-81,913
Distributions in excess of cumulative earnings from unconsolidated joint ventures	157,699	11,117
Net proceeds from disposition of real estate/joint venture interest	258,076	5,852
Proceeds from sale of marketable securities	3,555	190
Purchase of marketable securities	-10,025	-5,305
Other investments	20,594	-12,994
Origination of debt and preferred equity investments	-256,730	-277,877
Repayments or redemption of debt and preferred equity investments	60,412	432,667
Net cash used in investing activities	-318,041	-42,722
Financing Activities	'	'
Proceeds from mortgages and other loans payable	1,601,603	980,333
Repayments of mortgages and other loans payable	-1,496,224	-833,728
Proceeds from revolving credit facility, term loan and senior unsecured notes	683,000	370,000
Repayments of revolving credit facility, term loan and senior unsecured notes	-520,690	-404,970
Proceeds from stock options exercised and DRIP issuance	19,777	8,995
Net proceeds from sale of common stock	8,750	8,487
Net proceeds from sale of preferred stock	0	-9
Redemption of preferred stock	0	-192,500
Distributions to noncontrolling interests in other partnerships	-4,352	-8,152
Contributions from noncontrolling interests in other partnerships	1,548	3,364
Distributions to noncontrolling interests in the Operating Partnership	-3,598	-1,775
Dividends paid on common and preferred stock	-102,943	-79,534
Deferred loan costs and capitalized lease obligation	-43,981	-8,492
Net cash provided by (used in) financing activities	142,890	-157,981
Net increase in cash and cash equivalents	101,411	8,985
Cash and cash equivalents at beginning of period	206,692	189,984
Cash and cash equivalents at end of period	308,103	198,969
Supplemental Disclosure of Non-Cash Investing and Financing Activities:	'	'
Issuance of common stock as deferred compensation	1,406	0
Issuance of units in the Operating Partnership	19,460	12,675
Redemption of units in the Operating Partnership	23,066	17,287
Issuance of preferred units of limited partnership interest in the Operating Partnership	4,000	0
Fair value adjustment to noncontrolling interest in the Operating Partnership	107,925	36,091
Derivative instruments at fair value	17,088	479
Tenant improvements and capital expenditures payable	7,192	9,665
Capital leased asset	0	9,992
Transfer to net assets held for sale	339,809	207,665
Transfer to liabilities related to net assets held for sale	193,375	11,894
Transfer of financing receivable to debt investment	19,675	0
Deferred leasing payable	659	4,872
Consolidation of real estate	1,316,591	90,934
Assumption of mortgage loan	0	84,642
SL Green Operating Partnership	'	'
Operating Activities	'	'
Net income	406,943	61,585
Adjustments to reconcile net income to net cash provided by operating activities:	'	'
Depreciation and amortization	194,029	173,029
Equity in net income from unconsolidated joint ventures	-14,748	-1,313
Distributions of cumulative earnings from unconsolidated joint ventures	14,645	13,467
Equity in net (gain) loss on sale of interest in unconsolidated joint venture interest/real estate	-106,084	3,583
Purchase price fair value adjustment	71,446	-2,305
Depreciable real estate reserves	0	2,150
Gain on sale of discontinued operations	-114,735	-1,113
Loss on early extinguishment of debt	1,025	10,968
Deferred rents receivable	-26,727	-29,452
Other non-cash adjustments	-11,162	-28,675
Changes in operating assets and liabilities:	'	'
Restricted cashboperations	-4,850	6,127
Tenant and other receivables	5,890	4,896
Related party receivables	-853	768
Deferred lease costs	-10,688	-19,106
Other assets	-438	4,075
Accounts payable, accrued expenses and other liabilities and security deposits	12,973	1,793
Deferred revenue and deferred land leases payable	2,788	4,601
Net cash provided by operating activities	276,562	209,688
Investing Activities	'	'
Acquisitions of real estate property	-208,614	-52,534
Additions to land, buildings and improvements	-134,249	-61,531
Escrowed cashbcapital improvements/acquisition deposits	-38,227	-394
Investments in unconsolidated joint ventures	-170,532	-81,913
Distributions in excess of cumulative earnings from unconsolidated joint ventures	157,699	11,117
Net proceeds from disposition of real estate/joint venture interest	258,076	5,852
Proceeds from sale of marketable securities	3,555	190
Purchase of marketable securities	-10,025	-5,305
Other investments	20,594	-12,994
Origination of debt and preferred equity investments	-256,730	-277,877
Repayments or redemption of debt and preferred equity investments	60,412	432,667
Net cash used in investing activities	-318,041	-42,722
Financing Activities	'	'
Proceeds from mortgages and other loans payable	1,601,603	980,333
Repayments of mortgages and other loans payable	-1,496,224	-833,728
Proceeds from revolving credit facility, term loan and senior unsecured notes	683,000	370,000
Repayments of revolving credit facility, term loan and senior unsecured notes	-520,690	-404,970
Proceeds from stock options exercised and DRIP issuance	19,777	8,995
Net proceeds from sale of common stock	8,750	8,487
Net proceeds from sale of preferred stock	0	-9
Redemption of preferred stock	0	-192,500
Distributions to noncontrolling interests in other partnerships	-4,352	-8,152
Contributions from noncontrolling interests in other partnerships	1,548	3,364
Dividends paid on common and preferred stock	-106,541	-81,309
Deferred loan costs and capitalized lease obligation	-43,981	-8,492
Net cash provided by (used in) financing activities	142,890	-157,981
Net increase in cash and cash equivalents	101,411	8,985
Cash and cash equivalents at beginning of period	206,692	189,984
Cash and cash equivalents at end of period	308,103	198,969
Supplemental Disclosure of Non-Cash Investing and Financing Activities:	'	'
Issuance of common stock as deferred compensation	1,406	0
Issuance of units in the Operating Partnership	19,460	12,675
Redemption of units in the Operating Partnership	23,066	17,287
Issuance of preferred units of limited partnership interest in the Operating Partnership	4,000	0
Derivative instruments at fair value	17,088	479
Tenant improvements and capital expenditures payable	7,192	9,665
Capital leased asset	0	9,992
Transfer to net assets held for sale	339,809	207,665
Transfer to liabilities related to net assets held for sale	193,375	11,894
Transfer of financing receivable to debt investment	19,675	0
Deferred leasing payable	659	4,872
Consolidation of real estate	1,316,591	90,934
Assumption of mortgage loan	$0	$84,642

Organization_and_Basis_of_Pres

Organization and Basis of Presentation	6 Months Ended
	Jun. 30, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'
Organization and Basis of Presentation	'
	Organization and Basis of Presentation
	SL Green Realty Corp., which is referred to as the Company or SL Green, a Maryland corporation, and SL Green Operating Partnership, L.P., which is referred to as SLGOP or the Operating Partnership, a Delaware limited partnership, were formed in June 1997 for the purpose of combining the commercial real estate business of S.L. Green Properties, Inc. and its affiliated partnerships and entities. The Operating Partnership received a contribution of interest in the real estate properties, as well as 95% of the economic interest in the management, leasing and construction companies which are referred to as the Service Corporation, a consolidated variable interest entity. All of the management, leasing and construction services with respect to the properties that are wholly-owned by us 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 our operations are conducted through, the Operating Partnership. The Company is the sole managing general partner of the Operating Partnership. As of June 30, 2014, noncontrolling investors held, in the aggregate, a 3.53% limited partnership interest in the Operating Partnership. We refer to these interests as the noncontrolling interests in the Operating Partnership. See Note 11, "Noncontrolling Interests on the Company's Consolidated Financial Statements."
	Reckson Associates Realty Corp., or Reckson, and Reckson Operating Partnership, L.P., or ROP, are wholly-owned subsidiaries of the Operating Partnership.
	As of June 30, 2014, we owned the following interests in properties in the New York Metropolitan area, primarily in midtown Manhattan, a borough of New York City. Our investments in the New York Metropolitan area also include investments in Brooklyn, Long Island, Westchester County, Connecticut and Northern New Jersey, which are collectively known as the Suburban properties:
				Consolidated			Unconsolidated		Total
	Location		Type	Number of Properties		Square Feet	Number of Properties	Square Feet	Number of Properties	Square Feet	Weighted Average Occupancy(1)
	Commercial:
	Manhattan		Office	23		18,429,045	7	3,476,115	30	21,905,160	94.4	%
			Retail	7	-2	389,317	8	432,250	15	821,567	93.2	%
			Development/Redevelopment	11		2,063,790	4	1,605,782	15	3,669,572	44.2	%
			Fee Interest	2		961,400	—	—	2	961,400	100	%
				43		21,843,552	19	5,514,147	62	27,357,699	87.8	%
	Suburban		Office	27		4,365,400	4	1,222,100	31	5,587,500	81.7	%
			Retail	1		52,000	—	—	1	52,000	100	%
			Development/Redevelopment	1		85,000	1	65,641	2	150,641	42.7	%
				29		4,502,400	5	1,287,741	34	5,790,141	80.9	%
	Total commercial properties			72		26,345,952	24	6,801,888	96	33,147,840	86.6	%
	Residential:
	Manhattan		Residential	2	-2	653,337	—	—	2	653,337	93.2	%
	Suburban		Residential	1		66,611	—	—	1	66,611	84.4	%
	Total residential properties			3		719,948	—	—	3	719,948	91.9	%
	Total portfolio			75		27,065,900	24	6,801,888	99	33,867,788	86.7	%
	______________________________________________________________________
	-1	The weighted average occupancy for commercial properties represents the total occupied square feet divided by total available rentable square feet.  The weighted average occupancy for residential properties represents the total occupied units divided by total available units.
	-2	As of June 30, 2014, we owned a building that was comprised of 270,132 square feet of retail space and 222,855 square feet of residential space. For the purpose of this report, we have included the building as part of retail properties and have shown the square footage under its respective classifications.
	As of June 30, 2014, we also managed a 336,200 square foot office building owned by a third party. As of June 30, 2014, we also held debt and preferred equity investments with a book value of $1.5 billion.
	Partnership Agreement
	In accordance with the partnership agreement of the Operating Partnership, or the Operating Partnership Agreement, the Operating Partnership allocates 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, for shares of SL Green's common stock on a one-for-one basis.
	Basis of Quarterly Presentation
	The accompanying unaudited consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and notes required by accounting principles generally accepted in the United States for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for the fair presentation of the financial position of the Company and the Operating Partnership at June 30, 2014 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, 2014. 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, 2013 of the Company and the Operating Partnership.
	The consolidated balance sheets at December 31, 2013 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_Policie

Significant Accounting Policies	6 Months Ended
	Jun. 30, 2014
Accounting Policies [Abstract]	'
Significant Accounting Policies	'
	Significant Accounting Policies
	Principles of Consolidation
	The consolidated financial statements include our accounts and those of our subsidiaries, which are wholly-owned or controlled by us. Entities which we do not control through our voting interest and entities which are variable interest entities, but where we are not the primary beneficiary, are accounted for under the equity method or as debt and preferred equity investments. See Note 5, "Debt and Preferred Equity Investments" and Note 6, "Investments in Unconsolidated Joint Ventures." All significant intercompany balances and transactions have been eliminated.
	We consolidate a variable interest entity, or VIE, in which we are considered the primary beneficiary. The primary beneficiary is the entity that has (i) the power to direct the activities that most significantly impact the entity's economic performance and (ii) the obligation to absorb losses of the VIE or the right to receive benefits from the VIE that could be significant to the VIE. Included in commercial real estate properties on our consolidated balance sheets as of June 30, 2014 and December 31, 2013 are $609.4 million and $605.9 million, respectively, related to our consolidated VIEs. Included in mortgages and other loans payable on our consolidated balance sheets as of June 30, 2014 and December 31, 2013 are $365.8 million and $370.9 million, respectively, related to our consolidated VIEs.
	A noncontrolling interest in a consolidated subsidiary is defined as the portion of the equity (net assets) in a subsidiary not attributable, directly or indirectly, to us. Noncontrolling interests are required to be presented as a separate component of equity in the consolidated balance sheet and the presentation of net income was modified to present earnings and other comprehensive income attributed to controlling and noncontrolling interests.
	We assess the accounting treatment for each joint venture and debt and preferred equity investment. This assessment includes a review of each joint venture or limited liability company agreement to determine which party has what rights and whether those rights are protective or participating. For all VIEs, we review such agreements in order to determine which party has the power to direct the activities that most significantly impact the entity's economic performance. In situations where we and our partner approve, among other things, the annual budget, receive a detailed monthly reporting package from us, meet on a quarterly basis to review the results of the joint venture, review and approve the joint venture's tax return before filing, and approve all leases that cover more than a nominal amount of space relative to the total rentable space at each property, we do not consolidate the joint venture as we consider these to be substantive participation rights that result in shared power of the activities that most significantly impact the performance of our joint venture. Our joint venture agreements typically contain certain protective rights such as the requirement of partner approval to sell, finance or refinance the property and the payment of capital expenditures and operating expenditures outside of the approved budget or operating plan.
	Investment in Commercial Real Estate Properties
	On a periodic basis, we assess whether there are any indications that the value of our real estate properties may be impaired or that their carrying value may not be recoverable. A property's value is considered impaired if management's estimate of the aggregate future cash flows (undiscounted and without interest charges for consolidated properties) to be generated by the property is less than the carrying value of the property. To the extent impairment has occurred, the loss will be measured as the excess of the carrying amount of the property over the calculated fair value of the property. We also evaluate our real estate properties for potential impairment when a real estate property has been classified as held for sale. Real estate assets held for sale are valued at the lower of their carrying value or fair value less costs to sell. We do not believe that the values of any of our consolidated properties or properties held for sale were impaired at June 30, 2014.
	We allocate the purchase price of real estate to land and building (inclusive of tenant improvements) and, if determined to be material, intangibles, such as the value of above- and below-market leases and origination costs associated with the in-place leases. We depreciate the amount allocated to building (inclusive of tenant improvements) over their estimated useful lives, which generally range from three to 40 years. We amortize the amount allocated to the above- and below-market leases over the remaining term of the associated lease, which generally range from one to 14 years, and record it as either an increase (in the case of below-market leases) or a decrease (in the case of above-market leases) to rental income. We amortize the amount allocated to the values associated with in-place leases over the expected term of the associated lease, which generally ranges from one to 14 years. If a tenant vacates its space prior to the contractual termination of the lease and no rental payments are being made on the lease, any unamortized balance of the related intangible will be written off. The tenant improvements and origination costs are amortized as an expense over the remaining life of the lease (or charged against earnings if the lease is terminated prior to its contractual expiration date). We assess fair value of the leases based on estimated cash flow projections that utilize appropriate discount and capitalization rates and available market information. Estimates of future cash flows are based on a number of factors including the historical operating results, known trends, and market/economic conditions that may affect the property. To the extent acquired leases contain fixed rate renewal options that are below market and determined to be material, we amortize such below-market lease value into rental income over the renewal period.
	We recognized an increase of $6.2 million, $11.0 million, $6.2 million and $10.1 million in rental revenue for the three and six months ended June 30, 2014 and 2013, respectively, for the amortization of aggregate below-market leases in excess of above-market leases and a reduction in lease origination costs, resulting from the allocation of the purchase price of the applicable properties. We recognized a reduction in interest expense for the amortization of the above-market rate mortgages assumed of $1.3 million, $2.8 million, $1.2 million and $2.4 million for the three and six months ended June 30, 2014 and 2013, respectively.
	The following summarizes our identified intangible assets (acquired above-market leases and in-place leases) and intangible liabilities (acquired below-market leases) as of June 30, 2014 and December 31, 2013 (in thousands):
		30-Jun-14			December 31, 2013
	Identified intangible assets (included in other assets):
	Gross amount	$	702,189		$	746,704
	Accumulated amortization	(382,231		)	(343,339		)
	Net	$	319,958		$	403,365
	Identified intangible liabilities (included in deferred revenue):
	Gross amount	$	676,075		$	671,380
	Accumulated amortization	(461,952		)	(429,138		)
	Net	$	214,123		$	242,242
	Fair Value Measurements
	See Note 17, "Fair Value Measurements."
	Investment in Marketable Securities
	We invest in marketable securities. At the time of purchase, we are required to designate a security as held-to-maturity, available-for-sale, or trading depending on ability and intent. We do not have any securities designated as held-to-maturity or trading at this time. Securities available-for-sale are reported at fair value pursuant to ASC 820-10, with the net unrealized gains or losses reported as a component of accumulated other comprehensive income or loss. Unrealized losses that are determined to be other-than-temporary are recognized in earnings up to their credit component.
	The cost of bonds and marketable securities sold is determined using the specific identification method.
	At June 30, 2014 and December 31, 2013, we held the following marketable securities (in thousands):
		30-Jun-14			December 31, 2013
	Equity marketable securities	$	4,532		$	4,307
	Commercial mortgage-backed securities	35,380			24,419
	Rake bonds	—			3,323
	Total marketable securities available-for-sale	$	39,912		$	32,049
	Our equity marketable securities represent our investment in Gramercy Property Trust Inc. (NYSE: GPT), or Gramercy. Marc Holliday, our chief executive officer, remains a board member of Gramercy. As we do not have any significant influence over Gramercy, we account for our investment as available-for-sale securities.
	The cost basis of the commercial mortgage-backed securities was $32.6 million and $23.0 million at June 30, 2014 and December 31, 2013. These securities mature at various times through 2039. The cost basis of the rake bonds was $3.6 million at December 31, 2013.
	Investments in Unconsolidated Joint Ventures
	We assess our investments in unconsolidated joint ventures for recoverability, and if it is determined that a loss in value of the investment is other than temporary, we write down the investment to its fair value. We evaluate our equity investments for impairment based on the joint venture's projected discounted cash flows. We do not believe that the values of any of our equity investments were impaired at June 30, 2014.
	We may originate loans for real estate acquisition, development and construction, or ADC arrangements, where we expect to receive some or all of the residual profit. When the risk and rewards of these ADC arrangements are essentially the same as an investor or joint venture partner, we account for these ADC arrangements as real estate investments under the equity method of accounting for investments. Otherwise, we account for these ADC arrangements consistent with our loan accounting for our debt and preferred equity investments.
	Revenue Recognition
	Rental revenue is recognized on a straight-line basis over the term of the lease. Rental revenue recognition commences when the tenant takes possession or controls the physical use of the leased space. In order for the tenant to take possession, the leased space must be substantially ready for its intended use. To determine whether the leased space is substantially ready for its intended use, management evaluates whether we are or the tenant is the owner of tenant improvements for accounting purposes. When management concludes that we are the owner of tenant improvements, rental revenue recognition begins when the tenant takes possession of the finished space, which is when such tenant improvements are substantially complete. In certain instances, when management concludes that we are not the owner (the tenant is the owner) of tenant improvements, rental revenue recognition begins when the tenant takes possession of or controls the space. When management concludes that we are the owner of tenant improvements for accounting purposes, we record amounts funded to construct the tenant improvements as a capital asset. For these tenant improvements, we record amounts reimbursed by tenants as a reduction of the capital asset. When management concludes that the tenant is the owner of tenant improvements for accounting purposes, we record our contribution towards those improvements as a lease incentive, which is included in deferred costs, net on our consolidated balance sheets and amortized as a reduction to rental revenue on a straight-line basis over the term of the lease. The excess of rents recognized over amounts contractually due pursuant to the underlying leases are included in deferred rents receivable on the consolidated balance sheets. We establish, on a current basis, an allowance for future potential tenant credit losses, which may occur against this account. The balance reflected on the consolidated balance sheets is net of such allowance.
	In addition to base rent, our tenants also generally will pay their pro rata share of increases in real estate taxes and operating expenses for the building over a base year. In some leases, in lieu of paying additional rent based upon increases in building operating expenses, the tenant will pay additional rent based upon increases in the wage rate paid to porters over the porters' wage rate in effect during a base year or increases in the consumer price index over the index value in effect during a base year. In addition, many of our leases contain fixed percentage increases over the base rent to cover escalations. Electricity is most often supplied by the landlord either on a sub-metered basis, or rent inclusion basis (i.e., a fixed fee is included in the rent for electricity, which amount may increase based upon increases in electricity rates or increases in electrical usage by the tenant). Base building services other than electricity (such as heat, air conditioning and freight elevator service during business hours, and base building cleaning) are typically provided at no additional cost, with the tenant paying additional rent only for services which exceed base building services or for services which are provided outside normal business hours. These escalations are based on actual expenses incurred in the prior calendar year. If the expenses in the current year are different from those in the prior year, then during the current year, the escalations will be adjusted to reflect the actual expenses for the current year.
	We record a gain on sale of real estate when title is conveyed to the buyer, subject to the buyer's financial commitment being sufficient to provide economic substance to the sale and we have no substantial economic involvement with the buyer.
	Interest income on debt and preferred equity investments is accrued based on the outstanding principal amount and contractual terms of the instruments and when, in the opinion of management, it is deemed collectible. Several of the debt and preferred equity investments provide for accrual of interest at specified rates, which differ from current payment terms. Interest is recognized on such loans at the accrual rate subject to management's determination that accrued interest are ultimately collectible, based on the underlying collateral and operations of the borrower. If management cannot make this determination, interest income above the current pay rate is recognized only upon actual receipt.
	Deferred originations fees and loan origination costs, if any, are recognized as a reduction to the interest income over the terms of the related investments using the effective interest method. Fees received in connection with loan commitments are also deferred until the loan is funded and are then recognized over the term of the loan as an adjustment to yield. Discounts or premiums associated with the purchase of loans are amortized or accreted into interest income as a yield adjustment on the effective interest method based on expected cashflows through the expected maturity date of the related investment. If we purchase a debt or preferred equity investment at a discount, intend to hold it until maturity and expect to recover the full value of the investment, we accrete the discount into income as an adjustment to yield over the term of the investment. If we purchase a debt or preferred equity investment at a discount with the intention of foreclosing on the collateral, we do not accrete the discount. Anticipated exit fees, whose collection is expected, are also recognized over the term of the loan as an adjustment to yield.
	Debt and preferred equity investments are placed on a non-accrual status at the earlier of the date at which payments become 90 days past due or when, in the opinion of management, a full recovery of interest income becomes doubtful. Interest income recognition on any non-accrual debt or preferred equity investment is resumed when such non-accrual debt or preferred equity investment becomes contractually current and performance is demonstrated to be resumed. Interest is recorded as income on impaired loans only to the extent cash is received.
	We may syndicate a portion of the loans that we originate or sell these loans individually. When a transaction meets the criteria of sale accounting, we derecognize the loan sold and recognize gain or loss based on the difference between the sales price and the carrying value of the loan sold. Any related unamortized deferred origination fees, loan origination costs, discounts or premiums at the time of sale are recognized as an adjustment to the gain or loss on sale, which is included in investment income on the consolidated statement of income. Any fees received at the time of sale or syndication are recognized as part of investment income.
	Reserve for Possible Credit Losses
	The expense for possible credit losses in connection with debt and preferred equity investments is the charge to earnings to increase the allowance for possible credit losses to the level that we estimate to be adequate, based on Level 3 data, considering delinquencies, loss experience and collateral quality. Other factors considered relate to geographic trends and product diversification, the size of the portfolio and current economic conditions. Based upon these factors, we establish the provision for possible credit losses on each individual investment. When it is probable that we will be unable to collect all amounts contractually due, the investment is considered impaired.
	Where impairment is indicated on an investment that is held to maturity, a valuation allowance is measured based upon the excess of the recorded investment amount over the net fair value of the collateral. Any deficiency between the carrying amount of an asset and the calculated value of the collateral is charged to expense. We continue to assess or adjust our estimates based on circumstances of a loan and the underlying collateral. If the additional information obtained reflects increased recovery of our investment, we will adjust our reserves accordingly. There were no loan reserves recorded during each of the three and six months ended June 30, 2014 and 2013.
	Debt and preferred equity investments held for sale are carried at the lower of cost or fair market value using available market information obtained through consultation with dealers or other originators of such investments as well as discounted cash flow models based on Level 3 data pursuant to ASC 820-10. As circumstances change, management may conclude not to sell an investment designated as held for sale. In such situations, the investment will be reclassified at its net carrying value to debt and preferred equity investments held to maturity. For these reclassified investments, the difference between the current carrying value and the expected cash to be collected at maturity will be accreted into income over the remaining term of the investment.
	Income Taxes
	SL Green is taxed as a REIT under Section 856(c) of the Code. As a REIT, SL Green generally is not subject to Federal income tax. To maintain its qualification as a REIT, SL Green must distribute at least 90% of its REIT taxable income to its stockholders and meet certain other requirements. If SL Green fails to qualify as a REIT in any taxable year, we will be subject to Federal income tax on SL Green's taxable income at regular corporate rates. SL Green may also be subject to certain state, local and franchise taxes. Under certain circumstances, Federal income and excise taxes may be due on SL Green's undistributed taxable income.
	The Operating Partnership is a partnership and, as a result, all income and losses of the partnership are allocated to the partners for inclusion in their respective income tax returns. The only provision for income taxes included in the consolidated statements of income 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, a TRS may perform non-customary services for the tenants of the Company, hold assets that we cannot hold directly and generally may engage in any real estate or non-real estate related business. The TRSs generate income, resulting in Federal and state income tax liability for these entities.
	During the three and six months ended June 30, 2014 and 2013, we recorded a Federal, state and local tax provision of $2.1 million, $5.0 million, $2.3 million and $3.9 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 ratably 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 performance measures, the total estimated compensation cost is based on the fair value of the award at the applicable reporting date estimated using a binomial model. 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 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 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 primarily 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 Northern New Jersey. The tenants located in our buildings operate in various industries. Other than three tenants who account for 11.2%, 7.3% and 5.7% of our share of annualized cash rent, respectively, no other tenant in our portfolio accounted for more than 2.0% of our annualized cash rent, including our share of joint venture annualized rent, for the three months ended June 30, 2014. For the three months ended June 30, 2014, 9.7%, 9.6% and 7.3% of our annualized cash rent for consolidated properties was attributable to 1515 Broadway, 388-390 Greenwich Street and 1185 Avenue of the Americas, respectively. In addition, one of our preferred equity investments accounted for 13.3% of the income earned on debt and preferred equity investments during the three months ended June 30, 2014.
Reclassification
Certain prior year balances have been reclassified to conform to our current year presentation primarily in order to eliminate discontinued operations from income from continuing operations. In April 2014, we reclassified one of our debt and preferred equity investments to investments in unconsolidated joint ventures as a result of meeting the criteria of a real estate investment under the accounting guidance for ADC arrangements.
Accounting Standards Updates
In June 2014, the Financial Accounting Standards Board, or the FASB, issued final guidance that requires repurchase-to-maturity transactions to be accounted for as secured borrowings as if the transferor retains effective control, even though the transferred financial assets are not returned to the transferor at settlement and also eliminates existing guidance for repurchase financings (Accounting Standards Update, or ASU, No. 2014-11). New disclosures are required for (1) certain transactions accounted for as secured borrowings and (2) transfers accounted for as sales when the transferor also retains substantially all of the exposure to the economic return on the transferred financial assets throughout the term of the transaction. The guidance is effective for the first interim or annual period beginning after December 15, 2014, except for the disclosures related to transactions accounted for as secured borrowings, which are effective for periods beginning after March 15, 2015. Early adoption of this guidance is prohibited. The Company will adopt this standard beginning in the first quarter of 2015. The adoption of this guidance is not anticipated to have a material impact on our consolidated financial statements.
In May 2014, the FASB issued a new comprehensive revenue recognition guidance which requires us to recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which we expect to be entitled in exchange for those goods and services (ASU No. 2014-09). The guidance also requires enhanced disclosures to help users of financial statements better understand the nature, amount, timing, and uncertainty of revenue that is recognized. The guidance is effective for annual and interim periods beginning after December 15, 2016 and early adoption is not permitted. The new guidance can be applied either retrospectively to each prior reporting period presented, or as a cumulative-effect adjustment as of the date of adoption. The Company is currently evaluating the new guidance to determine the impact it may have on our consolidated financial statements.
In April 2014, the FASB issued new guidance on reporting discontinued operations which raises the threshold for disposals to qualify as discontinued operations (ASU No. 2014-08). The guidance also allows us to have a significant continuing involvement and continuing cash flows with the discontinued operations. Additionally, the guidance requires additional disclosures for discontinued operations and new disclosures for individually material disposal transactions that do not meet the definition of a discontinued operation. The guidance is effective for calendar year public companies beginning in the first quarter of 2015 and is to be applied on a prospective basis for new disposals. Early adoption of this guidance is permitted. The Company will adopt this standard beginning in the first quarter of 2015. The adoption of this guidance will change the presentation of discontinued operations but will not have a material impact on our consolidated financial statements.

Property_Acquisitions

Property Acquisitions	6 Months Ended
	Jun. 30, 2014
Business Combinations [Abstract]	'
Property Acquisitions	'
	Property Acquisitions
	In May 2014, we acquired Ivanhoe Cambridge, Inc.'s 49.65% economic interest in 388-390 Greenwich Street, thereby consolidating full ownership of the 2.4 million square foot property. The transaction valued the consolidated interests at $1.585 billion. This valuation was based on a negotiated sales agreement which took into consideration the recent extension of the existing triple net lease. Simultaneous with the closing, we refinanced the existing $1.1 billion mortgage with a four-year $1.5 billion mortgage, which bears interest at 175 basis points over LIBOR. We also assumed the existing derivative instruments, which swapped $504.0 million of the mortgage to fixed rate. We recognized a purchase price fair value adjustment of $71.4 million upon closing of this transaction. This property, which we initially acquired in December 2007, was previously accounted for as an investment in unconsolidated joint ventures. We are currently in the process of analyzing the purchase price allocation and, as such, we have not allocated any value to intangible assets.
	In November 2013, we acquired a 492,987 square foot mixed-use residential and commercial property located at 315 West 33rd Street, New York, New York for $386.8 million. Based on our preliminary analysis of the purchase price, we had allocated $116.0 million and $270.8 million to land and building, respectively. During the three months ended March 31, 2014, we finalized the purchase price allocation based on third party appraisal and additional facts and circumstances that existed at the acquisition date and reclassified $33.2 million and $7.8 million to values for above-market and in-place leases and below-market leases, respectively. These adjustments did not have a material impact to our consolidated statement of income for the six months ended June 30, 2014.
	Pro Forma
	The following table summarizes, on an unaudited pro forma basis, the results of operations of 388-390 Greenwich Street, which are included in the consolidated statement of income, and our consolidated results of operations for the three and six months ended June 30, 2014 and 2013 as though the acquisition of our joint venture partner's interest in 388-390 Greenwich Street was completed on January 1, 2013. The supplemental pro forma data is not necessarily indicative of what the actual results of operations would have been assuming the transactions had been completed as set forth above, nor do they purport to represent our results of operations for future periods.
			Three Months Ended June 30,			Six Months Ended June 30,
	(In thousands, except per share amounts)		2014		2013	2014		2013
	Actual revenues since acquisition		$	14,897		$	14,897
	Actual net income since acquisition		76,844			76,844
	Pro forma revenues		400,812		381,397	804,863		762,471
	Pro forma income from continuing operations		61,930		27,437	218,835		127,081
	Pro forma basic earnings per share		1.77		0.09	3.34		1.09
	Pro forma diluted earnings per share		1.76		0.09	3.33		1.09
	Pro forma basic earnings per unit		1.77		0.09	3.34		1.09
	Pro forma diluted earnings per unit		1.76		0.09	3.33		1.09
	______________________________________________________________________
	-1	The pro forma income from continuing operations for the three and six months ended June 30, 2014 and 2013 includes the effect of the new financing necessary to complete the acquisition and the preliminary allocation of purchase price in connection with the changes in depreciation and amortization. In addition, the pro forma income from continuing operations for the six months ended June 30, 2013 was adjusted to include the purchase price fair value adjustment, as though the acquisition was completed on January 1, 2013. The pro forma income from continuing operations for the three and six months ended June 30, 2014 excludes this purchase price fair value adjustment.

Properties_Held_for_Sale_and_D

Properties Held for Sale and Dispositions	6 Months Ended
	Jun. 30, 2014
Discontinued Operations and Disposal Groups [Abstract]	'
Properties Held for Sale and Dispositions	'
	Properties Held for Sale and Dispositions
	In June 2014, we entered into a contract to sell our leased fee interest in 2 Herald Square for $365.0 million. This transaction is expected to close during the fourth quarter of 2014, subject to the satisfaction of customary closing conditions.
	In April 2014, we entered into a contract to sell our fee interest and development rights in 985-987 Third Avenue for $68.7 million. The sale is being made in conjunction with the sale of an adjacent parcel, which we do not own. This transaction closed in July 2014.
	In May 2014, we sold our leasehold interest in 673 First Avenue for $145.0 million and recognized a gain on sale of $117.8 million.
	Discontinued operations included the results of operations of real estate assets under contract or sold prior to June 30, 2014. This included 2 Herald Square and 985-987 Third Avenue, which were both held for sale at June 30, 2014, 673 First Avenue, which was sold in May 2014, and 44 West 55th Street, 333 West 34th Street and 300 Main Street, which were sold in February, August, and September of 2013, respectively.
	The following table summarizes net income from discontinued operations for the three and six months ended June 30, 2014 and 2013, respectively (in thousands):
		Three Months Ended June 30,				Six Months Ended June 30,
		2014		2013		2014		2013
	Revenues
	Rental revenue	$	8,366	$	15,494	$	19,000	$	30,155
	Escalation and reimbursement revenues	258		789		1,080		1,985
	Other income	2		2		2		485
	Total revenues	8,626		16,285		20,082		32,625
	Operating expenses	291		2,362		1,179		4,832
	Real estate taxes	383		1,245		1,402		2,489
	Ground rent	805		719		3,001		3,582
	Interest expense, net of interest income	2,707		3,892		5,827		6,918
	Amortization of deferred financing costs	11		11		22		22
	Depreciable real estate reserves	—		2,150		—		2,150
	Depreciation and amortization	—		2,060		433		4,126
	Transaction related costs, net of recoveries	40		8		40		(13		)
	Total expenses	4,237		12,447		11,904		24,106
	Net income from discontinued operations	$	4,389	$	3,838	$	8,178	$	8,519

Debt_and_Preferred_Equity_Inve

Debt and Preferred Equity Investments	6 Months Ended
	Jun. 30, 2014
Investments, Debt and Equity Securities [Abstract]	'
Debt and Preferred Equity Investments	'
	Debt and Preferred Equity Investments
	During the six months ended June 30, 2014 and 2013, our debt and preferred equity investments, net of discounts and deferred origination fees, increased $303.4 million and $298.8 million, respectively, due to originations, purchases, accretion of reserves, discounts and paid-in-kind interest. We recorded repayments, participations and sales of $60.4 million and $419.8 million during the six months ended June 30, 2014 and 2013, respectively, which offset the increases in debt and preferred equity investments.
	Debt Investments
	As of June 30, 2014 and December 31, 2013, we held the following debt investments with an aggregate weighted average current yield of 10.69% at June 30, 2014 (in thousands):
	Loan Type		30-Jun-14			30-Jun-14		June 30, 2014 Carrying Value(1)		December 31, 2013 Carrying Value(1)			Initial
			Funding Obligations			Senior Financing							Maturity
													Date
	Fixed Rate Investments:
	Jr. Mortgage Participation		$	—		$	398,500	$	11,893	$	11,856		Mar-15
	Jr. Mortgage Participation/Mezzanine Loan		—			205,000		69,480		68,319			Feb-16
	Jr. Mortgage Participation/Mezzanine Loan		—			165,159		45,137		44,742			May-16
	Mezzanine Loan		—			177,000		14,519		15,012			May-16
	Jr. Mortgage Participation		—			133,000		49,000		49,000			Jun-16
	Mezzanine Loan		—			165,000		71,430		71,312			Nov-16
	Jr. Mortgage Participation/Mezzanine Loan(2)		—			1,109,000		95,329		26,884			Mar-17
	Other(2)		—			—		65,578		54,099			Mar-17
	Mezzanine Loan(3)		19,725			521,750		21,267		20,954			Jun-17
	Mortgage Loan		—			—		696		—			Aug-19
	Mezzanine Loan		—			15,000		3,500		3,500			Sep-21
	Mezzanine Loan(4)		—			90,000		19,928		19,926			Nov-23
	Total fixed rate		$	19,725		$	2,979,409	$	467,757	$	385,604
	Floating Rate Investments:
	Jr. Mortgage Participation/Mezzanine Loan(5)		—			330,000		131,987		131,724			Jul-14
	Mezzanine Loan(6)		—			180,000		59,974		59,892			Aug-14
	Jr. Mortgage Participation(7)		—			57,750		10,875		10,873			Aug-14
	Mezzanine Loan(8)		—			481,309		19,487		—			Sep-14
	Mezzanine Loan		9,794			93,279		40,125		38,549			Oct-14
	Jr. Mortgage Participation(9)		—			84,000		24,959		24,046			Feb-15
	Mezzanine Loan		22,817			50,000		22,002		—			Apr-15
	Mortgage/Mezzanine Loan		—			—		108,981		—			Jun-15
	Mezzanine Loan		—			110,000		49,354		49,110			Sep-15
	Mezzanine Loan		9,215			107,157		40,662		27,662			Dec-15
	Mezzanine Loan		—			775,000		73,326		72,823			Mar-16
	Mezzanine Loan(10)		—			160,000		22,549		22,526			Jun-16
	Mezzanine Loan		—			115,000		24,907		25,590			Jul-16
	Mezzanine Loan		10,584			168,485		26,655		25,725			Nov-16
	Mezzanine Loan		333			33,833		11,816		11,798			Dec-16
	Jr. Mortgage Participation/Mezzanine Loan		—			55,000		20,544		20,553			Jul-18
	Mortgage/Mezzanine Loan		—			—		17,923		—			Feb-19
	Mezzanine Loan		—			38,000		21,789		—			Mar-19
	Mortgage Loan(11)		—			—		—		30,000
	Total floating rate		$	52,743		$	2,838,813	$	727,915	$	550,871
	Total		$	72,468		$	5,818,222	1,195,672		936,475
	Loan loss reserve							—		(1,000		)
	Total							$	1,195,672	$	935,475
	______________________________________________________________________
	-1	Carrying value is net of discounts, original issue discounts and deferred origination fees.
	-2	During the three months ended March 31, 2014, we recognized $10.1 million of previously unaccrued interest income as deemed collectible as a result of the subsequent sale of the property, which closed in June 2014. In connection with the sale of the underlying property, our existing $66.7 million mezzanine loan was defeased and is now shown separately, as it is collateralized by defeasance securities. The buyer assumed our $30.0 million participating interest on the mortgage and we acquired a $67.3 million participating interest on the mezzanine loan.
	-3	Carrying value is net of $41.3 million that was participated out, which is included in other assets and other liabilities on the consolidated balance sheets as a result of the transfer not meeting the conditions for sale accounting.
	-4	Carrying value is net of $5.0 million that was participated out, which is included in other assets and other liabilities on the consolidated balance sheets as a result of the transfer not meeting the conditions for sale accounting.
	-5	This loan was repaid in July 2014.
	-6	This loan was repaid in August 2014.
	-7	In June 2014, the loan maturity date was extended to August 2014 and $10.8 million has been repaid.
	-8	This loan was previously included in other assets on the consolidated balance sheets. Following the sale of our interest in the partnership that is the borrower, the loan was reclassified to debt and preferred equity investments.
	-9	In March 2014, the loan was extended to February 2015.
	-10	Carrying value is net of $7.4 million that was participated out, which is included in other assets and other liabilities on the consolidated balance sheets as a result of the transfer not meeting the conditions for sale accounting.
	-11	This loan was repaid in May 2014.
	Preferred Equity Investments
	As of June 30, 2014 and December 31, 2013, we held the following preferred equity investments with an aggregate weighted average current yield of 9.75% at June 30, 2014 (in thousands):
	Type		June 30, 2014			June 30, 2014		December 31, 2013		Initial
			Senior Financing			Carrying Value (1)		Carrying Value (1)		Mandatory
										Redemption
	Preferred equity(2)		$	525,000		$	119,197	$	115,198	Jul-15
Preferred equity(2)		926,260			222,992		218,330		Jul-16
Preferred equity		70,000			9,947		9,940		Nov-17
Preferred equity(3)		—			—		25,896
		$	1,521,260		$	352,136	$	369,364
______________________________________________________________________
-1	Carrying value is net of discounts and deferred origination fees.
-2	The difference between the pay and accrual rates is included as an addition to the principal balance outstanding.
-3	This preferred equity investment was redeemed in April 2014.
The following table is a rollforward of our total loan loss reserves at June 30, 2014 and December 31, 2013 (in thousands):
	June 30, 2014			December 31, 2013
Balance at beginning of year	$	1,000		$	7,000
Expensed	—			—
Recoveries	—			—
Charge-offs and reclassifications	(1,000		)	(6,000		)
Balance at end of period	$	—		$	1,000
At June 30, 2014 and December 31, 2013, all debt and preferred equity investments were performing in accordance with the terms of the loan agreements.
We have determined that we have one portfolio segment of financing receivables at June 30, 2014 and December 31, 2013 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 $134.9 million and $172.8 million at June 30, 2014 and December 31, 2013, respectively. No financing receivables were 90 days past due at June 30, 2014.

Investment_in_Unconsolidated_J

Investment in Unconsolidated Joint Ventures	6 Months Ended
	Jun. 30, 2014
Equity Method Investments and Joint Ventures [Abstract]	'
Investment in Unconsolidated Joint Ventures	'
	Investments in Unconsolidated Joint Ventures
	We have investments in several real estate joint ventures with various partners, including Ivanhoe Cambridge, Inc., formerly SITQ Immobilier, a subsidiary of Caisse de depot et placement du Quebec, SITQ, Canada Pension Plan Investment Board, or CPPIB, Prudential Real Estate Investors, or Prudential, Onyx Equities, or Onyx, The Witkoff Group, or Witkoff, Credit Suisse Securities (USA) LLC, or Credit Suisse, Jeff Sutton, or Sutton, Harel Insurance and Finance, or Harel, Louis Cappelli, or Cappelli, The Moinian Group, or Moinian, Vornado Realty Trust (NYSE: VNO), or Vornado, Plaza Global Real Estate Partners LP, or Plaza, Lehman Bros., as well as private investors. All the investments below are voting interest entities, except for 650 Fifth Avenue, 33 Beekman, 3 Columbus Circle and 180/182 Broadway which are VIEs in which we are not the primary beneficiary as of June 30, 2014 and December 31, 2013. Prior to the acquisition of our joint venture partner's interest in May 2014, 388-390 Greenwich was also a VIE. Our net equity investment in these VIEs was $185.2 million and $310.7 million at June 30, 2014 and December 31, 2013, respectively. As we do not control the joint ventures listed below, we account for them under the equity method of accounting.
	The table below provides general information on each of our joint ventures as of June 30, 2014 (amounts in thousands):
	Property	Partner		Ownership	Economic		Square			Acquisition Date		Acquisition
				Interest	Interest		Feet					Price(1)
	100 Park Avenue	Prudential		49.90%	49.90%		834			Jan-00		$	95,800
	717 Fifth Avenue	Sutton/Private Investor		10.92%	10.92%		120			Sep-06		251,900
	800 Third Avenue	Private Investors		42.95%	42.95%		526			Dec-06		285,000
	1745 Broadway	Witkoff/SITQ/Lehman Bros.		32.26%	32.26%		674			Apr-07		520,000
	1 and 2 Jericho Plaza	Onyx/Credit Suisse		20.26%	20.26%		640			Apr-07		210,000
	The Meadows	Onyx		50.00%	50.00%		582			Sep-07		111,500
	180/182 Broadway(2)	Harel/Sutton		25.50%	25.50%		71			Feb-08		43,600
	600 Lexington Avenue	CPPIB		55.00%	55.00%		304			May-10		193,000
	11 West 34th Street	Private Investor/Sutton		30.00%	30.00%		17			Dec-10		10,800
	7 Renaissance	Cappelli		50.00%	50.00%		37			Dec-10		4,000
	3 Columbus Circle(3)	Moinian		48.90%	48.90%		769			Jan-11		500,000
	280 Park Avenue	Vornado		50.00%	49.50%		1,237			Mar-11		400,000
	1552-1560 Broadway(4)	Sutton		50.00%	50.00%		49			Aug-11		136,550
	724 Fifth Avenue	Sutton		50.00%	50.00%		65			Jan-12		223,000
	10 East 53rd Street	CPPIB		55.00%	55.00%		390			Feb-12		252,500
	33 Beekman(5)	Harel/Naftali		45.90%	45.90%		145			Aug-12		31,000
	521 Fifth Avenue	Plaza		50.50%	50.50%		460			Nov-12		315,000
	21 East 66th Street(6)	Private Investors		32.28%	32.28%		17			Dec-12		75,000
	315 West 36th Street	Private Investors		35.50%	35.50%		148			Dec-12		45,000
	650 Fifth Avenue(7)	Sutton		50.00%	50.00%		32			Nov-13		—
	______________________________________________________________________
	-1	Acquisition price represents the actual or implied gross purchase price for the joint venture.
	-2	In June 2014, the joint venture entered into a contract to sell the property for $222.5 million. This transaction is expected to close during the third quarter of 2014, subject to satisfaction of customary closing conditions.
	-3	As a result of the sale of a condominium interest in September 2012, Young & Rubicam, Inc., or Y&R, owns a portion of the property, generally floors three through eight referred to as Y&R units. Because the joint venture has an option to repurchase the Y&R units, the gain associated with this sale was deferred.
	-4	The purchase price pertained only to the purchase of the 1552 Broadway interest which comprised 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 joint venture owns a fee interest in the property and will develop an approximately 30 story building for student housing. Upon completion of the development, the joint venture will convey a long-term ground lease condominium interest in the building to Pace.
	-6	We hold a 32.28% interest in three retail and two residential units at the property and a 16.14% interest in four 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 Sutton 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.
	In May 2014, we sold our 33.33% partnership interest in the joint venture which owns 100% interest as tenant-in-common in 30 East 65th Street Corporation and the related proprietary lease of five cooperative apartment units in the property located at 747 Madison Avenue at an implied gross valuation of $160.0 million, inclusive of the $33.1 million mortgage encumbering the property. We recognized a promote of $10.3 million and originated a $30.0 million preferred equity investment. Given our continuing involvement as a preferred equity holder, we deferred the gain on sale of $13.1 million as we did not meet the requisites of a sale under the full accrual method. We, along with our joint venture partners, retained one apartment unit at this property.
	In March 2014, we sold our 43.74% economic ownership interest in the joint venture which holds the West Coast Office portfolio at an implied gross valuation of $756.0 million, inclusive of the $526.3 million mortgage encumbering the property. We recognized a gain of $85.5 million on the sale of our investment.
	In March 2014, we closed on the origination of a $100.0 million acquisition and equity participating financing consisting of a $60.0 million mezzanine loan and a $40.0 million preferred equity, which are both due to mature in March 2016, subject to three one-year extension options and a two-year option for the last extension. These loans, which were previously accounted for as debt and preferred equity investments, were reclassified to investments in unconsolidated joint ventures as a result of meeting the criteria of a real estate investment under the guidance for ADC arrangements. We have accounted for this wholly-owned investment under the equity method of accounting.
	In January 2014, we sold our 49.90% partnership interest in the joint venture which holds 21-25 West 34th Street at an implied gross valuation of $114.9 million, inclusive of the $100.0 million mortgage encumbering the property. We recognized a gain of $20.9 million on the sale of our investment. We, along with our joint venture partner, retained 91,311 square feet of development rights at this property.
	We generally finance our joint ventures with non-recourse debt. However, in certain cases we have provided guarantees or master leases for tenant space. These guarantees and master leases terminate upon the satisfaction of specified circumstances or repayment of the underlying loans. The first mortgage notes and other loans payable collateralized by the respective joint venture properties and assignment of leases at June 30, 2014 and December 31, 2013, respectively, are as follows (amounts in thousands):
	Property		Maturity Date		Interest			30-Jun-14				31-Dec-13
					Rate(1)
	Fixed Rate Debt:
	7 Renaissance		Dec-15		10	%		$	1,461			$	1,276
	11 West 34th Street		Jan-16		4.82	%		17,056				17,205
	280 Park Avenue		Jun-16		6.57	%		703,520				706,886
	1745 Broadway		Jan-17		5.68	%		340,000				340,000
	1 and 2 Jericho Plaza		May-17		5.65	%		163,750				163,750
	800 Third Avenue		Aug-17		6	%		20,910				20,910
	315 West 36th Street		Dec-17		3.16	%		25,000				25,000
	717 Fifth Avenue(2)		Jul-22		4.45	%		300,000				300,000
	21 East 66th Street		Apr-23		3.6	%		12,000				12,000
	717 Fifth Avenue(2)		Jul-24		9	%		309,074				304,000
	388 and 390 Greenwich Street(3)		—		—			—				996,082
	100 Park Avenue(4)		—		—			—				209,786
	21 West 34th Street(5)		—		—			—				100,000
	1604-1610 Broadway(6)		—		—			—				27,000
	Total fixed rate debt							$	1,892,771			$	3,223,895
	Floating Rate Debt:
	180/182 Broadway		Dec-14		2.91	%		89,551				89,893
	The Meadows		Sep-15		7.75	%		67,350				67,350
	3 Columbus Circle(7)		Apr-16		2.33	%		235,129				239,233
	1552 Broadway(8)		Apr-16		4.16	%		175,904				158,690
	Other loan payable		Jun-16		1.06	%		30,000				30,000
	10 East 53rd Street		Feb-17		2.66	%		125,000				125,000
724 Fifth Avenue(9)		Apr-17		2.58	%		275,000				120,000
33 Beekman(10)		Aug-17		2.91	%		34,141				18,362
600 Lexington Avenue		Oct-17		2.23	%		118,689				120,616
521 Fifth Avenue		Nov-19		2.36	%		170,000				170,000
100 Park Avenue(4)		Feb-21		1.91	%		360,000				—
21 East 66th Street		Jun-33		2.88	%		1,921				1,959
388 and 390 Greenwich Street(3)		—		—			—				142,297
747 Madison Avenue		—		—			—				33,125
West Coast Office portfolio(11)		—		—			—				526,290
Total floating rate debt							$	1,682,685			$	1,842,815
Total joint venture mortgages and other loans payable							$	3,575,456			$	5,066,710
_________________________________
-1	Effective weighted average interest rate for the three months ended June 30, 2014, 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	In May 2014, we acquired the interest of our joint venture thereby consolidating the entity. Simultaneous with the acquisition, we refinanced the mortgage and realized a net loss on early extinguishment of debt of $2.4 million.
-4	In February 2014, the joint venture replaced the previous fixed rate mortgage with a $360.0 million, seven-year floating rate, mortgage and realized a net loss on early extinguishment of $3.2 million.
-5	In January 2014, we sold our interest in the joint venture, inclusive of our share of the joint venture debt.
-6	This loan was in default since November 2009 due to the non-payment of debt service. In January 2014, the joint venture relinquished its ground lease position to the lender. During the six months ended June 30, 2014, we also recognized $7.7 million of incentive income, which is included in other income on the consolidated statements of income.
-7	The joint venture has the ability to increase the mortgage by $40.0 million based on meeting certain performance hurdles. In connection with this obligation, we executed a master lease agreement and our joint venture partner executed a contribution agreement to reflect its pro rata obligation under the master lease. The lien on the mortgage and the master lease excludes the condominium interest owned by Y&R. See Note 3 of prior table.
-8	These loans are comprised of a $150.0 million mortgage loan and a $41.5 million mezzanine loan and are subject to two one-year extension options. As of June 30, 2014, $8.4 million of the mortgage loan and $7.2 million of the mezzanine loan remained unfunded.
-9	In April 2014, the joint venture refinanced the previous mortgage with a $235.0 million mortgage and a $40.0 million mezzanine loan and realized a net loss on early extinguishment of debt of $1.2 million. These new floating rate loans mature in April 2017.
-10	This loan has a committed amount of $75.0 million, which 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.
-11	In March 2014, we sold our interest in the joint venture, inclusive of our share in the joint venture debt.
We act as the operating partner and day-to-day manager for all our joint ventures, except for 800 Third Avenue, 1 and 2 Jericho Plaza, 280 Park Avenue, 3 Columbus Circle and The Meadows. We are entitled to receive fees for providing management, leasing, construction supervision and asset management services to our joint ventures. We earned $4.8 million, $11.2 million, $1.4 million and $4.0 million from these services for the three and six months ended June 30, 2014 and 2013, respectively. In addition, we have the ability to earn incentive fees based on the ultimate financial performance of certain of the joint venture properties.
The combined balance sheets for the unconsolidated joint ventures, at June 30, 2014 and December 31, 2013, are as follows (in thousands):
	30-Jun-14			December 31, 2013
Assets
Commercial real estate property, net	$	4,925,422		$	6,846,021
Other assets	749,571			827,282
Total assets	$	5,674,993		$	7,673,303
Liabilities and members' equity
Mortgages and other loans payable	$	3,575,456		$	5,066,710
Other liabilities	485,753			596,960
Members' equity	1,613,784			2,009,633
Total liabilities and members' equity	$	5,674,993		$	7,673,303
Company's investments in unconsolidated joint ventures	$	971,926		$	1,113,218
The combined statements of income for the unconsolidated joint ventures, from acquisition date through the three and six months ended June 30, 2014 and 2013 are as follows (in thousands):
	Three Months Ended June 30,							Six Months Ended June 30,
	2014			2013				2014				2013
Total revenues	$	130,495		$	154,974			$	291,633			$	306,205
Operating expenses	18,362			28,205				45,045				56,816
Ground rent	2,632			658				4,657				1,315
Real estate taxes	15,406			16,958				32,342				34,263
Interest expense, net of interest income	44,728			56,561				97,064				112,968
Amortization of deferred financing costs	2,026			5,302				6,659				9,585
Transaction related costs, net of recoveries	(207		)	—				64				—
Depreciation and amortization	33,858			52,539				79,462				95,150
Total expenses	116,805			160,223				265,293				310,097
Loss on early extinguishment of debt	(3,546		)	—				(6,743		)		—
Net income (loss) before gain on sale	$	10,144		$	(5,249	)		$	19,597			$	(3,892	)
Company's equity in net income (loss) from unconsolidated joint ventures	$	8,619		$	(3,761	)		$	14,748			$	1,313

Deferred_Costs

Deferred Costs	6 Months Ended
	Jun. 30, 2014
Deferred Costs [Abstract]	'
Deferred Costs	'
	Deferred Costs
	Deferred costs at June 30, 2014 and December 31, 2013 consisted of the following (in thousands):
		30-Jun-14			December 31, 2013
	Deferred leasing	$	331,716		$	326,379
	Deferred financing	201,148			157,088
		532,864			483,467
	Less accumulated amortization	(232,821		)	(216,409		)
	Deferred costs, net	$	300,043		$	267,058

Mortgages_and_Other_Loans_Paya

Mortgages and Other Loans Payable	6 Months Ended
	Jun. 30, 2014
Mortgages and Other Loans Payable	'
Mortgages and Other Loans Payable	'
	Mortgages and Other Loans Payable
	The first mortgages and other loans payable collateralized by the respective properties and assignment of leases at June 30, 2014 and December 31, 2013 were as follows (amounts in thousands):
	Property		Maturity	Interest		30-Jun-14		31-Dec-13
			Date	Rate(1)
	Fixed Rate Debt:
	125 Park Avenue		Oct-14	5.75	%	$	146,250	$	146,250
	711 Third Avenue		Jun-15	4.99	%	120,000		120,000
	625 Madison Avenue		Nov-15	7.27	%	117,892		120,830
	500 West Putnam Avenue		Jan-16	5.52	%	23,253		23,529
	420 Lexington Avenue		Sep-16	7.15	%	181,612		182,641
	Landmark Square		Dec-16	4	%	82,097		82,909
	485 Lexington Avenue		Feb-17	5.61	%	450,000		450,000
	120 West 45th Street		Feb-17	6.12	%	170,000		170,000
	762 Madison Avenue		Feb-17	3.75	%	8,128		8,211
	2 Herald Square(2)		Apr-17	5.36	%	191,250		191,250
	885 Third Avenue		Jul-17	6.26	%	267,650		267,650
	388-390 Greenwich Street(3)		Jun-18	3.8	%	504,000		—
	Other loan payable(4)		Sep-19	8	%	50,000		50,000
	One Madison Avenue		May-20	5.91	%	576,653		587,336
	100 Church		Jul-22	4.68	%	230,000		230,000
	919 Third Avenue(5)		Jun-23	5.12	%	500,000		500,000
	400 East 57th Street		Feb-24	4.13	%	69,503		70,000
	400 East 58th Street		Feb-24	4.13	%	29,787		30,000
	1515 Broadway		Mar-25	3.93	%	900,000		900,000
	Series J Preferred Units(6)		Apr-51	3.75	%	4,000		—
	609 Partners, LLC(7)		—	—		—		23
	Total fixed rate debt					$	4,622,075	$	4,130,629
	Floating Rate Debt:
	Master repurchase agreement(8)		Dec-14	3.37	%	—		91,000
	180 Maiden Lane(9)		Nov-16	2.34	%	258,351		262,706
	388-390 Greenwich Street(3)		Jun-18	1.91	%	946,000		—
	248-252 Bedford Avenue(10)		Jun-19	2.16	%	29,000		22,000
	220 East 42nd Street		Oct-20	1.76	%	275,000		275,000
	16 Court Street(11)		0	0		—		79,243
	Total floating rate debt					$	1,508,351	$	729,949
	Total mortgages and other loans payable					$	6,130,426	$	4,860,578
	_________________________________
	-1	Effective weighted average interest rate for the three months ended June 30, 2014, taking into account interest rate hedges in effect during the period.
	-2	This property is held for sale at June 30, 2014 and the related $191.3 million mortgage is included in liabilities related to assets held for sale.
	-3	Simultaneous with the acquisition of our joint venture partner interest, we refinanced the $1.1 billion floating rate mortgage with a $1.5 billion seven-year floating rate mortgage, and have consolidated the property.
	-4	This loan is secured by a portion of a preferred equity investment.
	-5	We own a 51.0% controlling interest in the joint venture that is the borrower on this loan.
	-6	In connection with the subsequent acquisition of a commercial real estate property, the Operating Partnership issued $4.0 million or 4,000 3.75% Series J Preferred Units of limited partnership interest, of the Series J Preferred Units, with a mandatory liquidation preference of $1,000.00 per unit. The Series J Preferred Units can be redeemed in cash by the Operating Partnership on the earlier of (i) the date of the sale of the property or (ii) April 30, 2051 or at the option of the unitholders as further prescribed in the related agreement.
	-7	In April 2014, the remaining 22,658 Series E Preferred Units of the Operating Partnership were canceled.
	-8	The Master Repurchase Agreement, or MRA, has a maximum facility capacity of $300.0 million.
	-9	In connection with this consolidated joint venture obligation, we executed a master lease agreement. Our partner has executed a contribution agreement to reflect its pro rata share of the obligation under the master lease.
	-10	In June 2014, we replaced the previous floating rate mortgage with a $29.0 million, five-year floating rate mortgage and incurred a net loss on early extinguishment of debt of $0.5 million.
	-11	In April 2014, we repaid the loan and incurred a loss on early extinguishment of debt of $0.5 million.
	The gross book value of the properties and debt and preferred equity investments collateralizing the mortgages and other loans payable was $9.5 billion and $8.0 billion at June 30, 2014 and December 31, 2013, respectively.

Corporate_Indebtedness

Corporate Indebtedness	6 Months Ended
	Jun. 30, 2014
Debt Disclosure [Abstract]	'
Corporate Indebtedness	'
	Corporate Indebtedness
	2012 Credit Facility
	In March 2014, we entered into an amendment to the $1.6 billion credit facility entered into by the Company in November 2012, or the 2012 credit facility, which, among other things, increased the term loan portion of the 2012 credit facility by $383.0 million to $783.0 million, decreased the interest-rate margin applicable to the term loan 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. The 2012 credit facility, as amended, consists of a $1.2 billion revolving credit facility, or the revolving credit facility, and a $783.0 million term loan facility, or the term loan facility. The revolving credit facility matures in March 2017 and includes two six-month as-of-right extension options, subject to the payment of an extension fee of 10 basis points for each such extension. We also have an option, subject to customary conditions, without the consent of existing lenders, to increase the capacity under the revolving credit facility to $1.5 billion at any time prior to the maturity date for the revolving credit facility, by obtaining additional commitments from our existing lenders and other financial institutions.
	The 2012 credit facility bears interest at a spread over LIBOR ranging from (i) 100 basis points to 175 basis points for loans under the revolving credit facility and (ii) 95 basis points to 190 basis points for loans under the term loan facility, in each case based on the credit rating assigned to the senior unsecured long term indebtedness of ROP. At June 30, 2014, the applicable spread was 145 basis points for the revolving credit facility and 140 basis points for the term loan facility. At June 30, 2014, the effective interest rate was 1.61% for the revolving credit facility and 1.64% for the term loan facility. We are required to pay quarterly in arrears a 15 to 35 basis point facility fee on the total commitments under the revolving credit facility based on the credit rating assigned to the senior unsecured long term indebtedness of ROP. As of June 30, 2014, the facility fee was 30 basis points. At June 30, 2014, we had $116.3 million of outstanding letters of credit and $783.0 million outstanding under the term loan facility, with total undrawn capacity of $1.1 billion under the revolving credit facility.
	In connection with the amendment of the 2012 credit facility, we incurred debt origination and other loan costs of $2.8 million. We evaluated the modification pursuant to ASC 470 and determined that the terms of the amendment were not substantially different from the terms of the previous 2012 credit facility. As a result, these deferred costs and the unamortized balance of the costs previously incurred are amortized through the extended maturity date of the term loan facility.
	The Company, the Operating Partnership and ROP are all borrowers jointly and severally obligated under the 2012 credit facility. None of our other subsidiaries are obligors under the 2012 credit facility.
	The 2012 credit facility includes certain restrictions and covenants (see Restrictive Covenants below).
	Senior Unsecured Notes
	The following table sets forth our senior unsecured notes and other related disclosures as of June 30, 2014 and December 31, 2013 by scheduled maturity date (amounts in thousands):
	Issuance		June 30, 2014 Unpaid Principal Balance				June 30, 2014 Accreted Balance			December 31, 2013 Accreted Balance			Coupon			Effective			Term	Maturity Date
													Rate(1)			Rate			(in Years)
	August 13, 2004(2)		$	75,898			$	75,898		$	75,898		5.88	%		5.88	%		10	August 15, 2014
	March 31, 2006(2)		255,308				255,227			255,206			6	%		6	%		10	March 31, 2016
	October 12, 2010(3)		345,000				303,354			297,837			3	%		3	%		7	October 15, 2017
	August 5, 2011(4)		250,000				249,712			249,681			5	%		5	%		7	August 15, 2018
	March 16, 2010(4)		250,000				250,000			250,000			7.75	%		7.75	%		10	March 15, 2020
	November 15, 2012(4)		200,000				200,000			200,000			4.5	%		4.5	%		10	December 1, 2022
	June 27, 2005(2)(5)		7				7			7			4	%		4	%		20	June 15, 2025
	March 26, 2007(6)		10,008				10,008			10,701			3	%		3	%		20	March 30, 2027
			$	1,386,221			$	1,344,206		$	1,339,330
	_________________________________
	-1	Interest on the senior unsecured notes is payable semi-annually with principal and unpaid interest due on the scheduled maturity dates.
	-2	Issued by ROP.
	-3	Issued by the Operating Partnership. Interest on these exchangeable notes is payable semi-annually on April 15 and October 15. The notes had an initial exchange rate representing an exchange price that was set at a 30.0% premium to the last reported sale price of SL Green's common stock on October 6, 2010, or $85.81. The initial exchange rate is subject to adjustment under certain circumstances. The current exchange rate is 11.7153 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 guaranteed by ROP. On the issuance date, $78.3 million of the debt balance was recorded in equity. As of June 30, 2014, $41.6 million remained to be amortized into the debt balance.
	-4	Issued by the Company, the Operating Partnership and ROP, as co-obligors.
	-5	Exchangeable senior debentures which are currently callable at par. In addition, the debentures can be put to ROP, at the option of the holder at par plus accrued and unpaid interest, on June 15, 2015 and 2020 and upon the occurrence of certain change of control transactions. As a result of the acquisition of all outstanding shares of common stock of Reckson, or the Reckson Merger, the adjusted exchange rate for the debentures is 7.7461 shares of SL Green's common stock per $1,000 of principal amount of debentures and the adjusted reference dividend for the debentures is $1.3491.
	-6	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 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.
	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 minimum amount of tangible net worth, a maximum ratio of total indebtedness to total asset value, a minimum ratio of EBITDA to fixed charges, a maximum ratio of secured indebtedness to total asset value and a maximum ratio of unsecured indebtedness to unencumbered asset value. The dividend restriction referred to above provides that, we will not during any time when a default is continuing, make distributions with respect to common stock or other equity interests, except to enable the Company to continue to qualify as a REIT for Federal income tax purposes. As of June 30, 2014, we were in compliance with all such covenants.
	Junior Subordinate 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 three-month LIBOR plus 125 basis points. Interest payments may be deferred for a period of up to eight consecutive quarters if the Operating Partnership exercises its right to defer such payments. The Trust preferred securities are redeemable at the option of the Operating Partnership, in whole or in part, with no prepayment premium. We do not consolidate the Trust even though it is a variable interest entity as we are not the primary beneficiary. Because the Trust is not consolidated, we have recorded the debt on our consolidated balance sheets and the related payments are classified as interest expense.
	Principal Maturities
	Combined aggregate principal maturities of mortgages and other loans payable, the 2012 credit facility, trust preferred securities, senior unsecured notes and our share of joint venture debt as of June 30, 2014, including as-of-right extension options, were as follows (in thousands):
		Scheduled				Principal				Trust			Term Loan and Senior				Total			Joint
		Amortization				Repayments				Preferred			Unsecured							Venture
										Securities			Notes							Debt
	Remaining 2014	$	23,163			$	146,250			$	—		$	75,898			$	245,311		$	27,651
	2015	47,480				229,537				—			7				277,024			44,260
	2016	55,946				514,311				—			255,308				825,565			561,736
	2017	61,063				1,086,579			-1	—			355,008				1,502,650			442,584
	2018	64,462				—				—			250,000				314,462			28
	Thereafter	246,979				3,654,656				100,000			1,233,000				5,234,635			353,580
		$	499,093			$	5,631,333		-1	$	100,000		$	2,169,221			$	8,399,647		$	1,429,839
	________________________________
	-1	Principal repayments include the mortgage at 2 Herald Center, which is included in liabilities related to assets held for sale.
	Consolidated interest expense, excluding capitalized interest, was comprised of the following (in thousands):
			Three Months Ended June 30,							Six Months Ended June 30,
			2014				2013			2014			2013
	Interest expense		$	79,163			$	80,009		$	157,414		$	158,758
	Interest income		(552		)		(458		)	(1,084		)	(898		)
	Interest expense, net		$	78,611			$	79,551		$	156,330		$	157,860
	Interest capitalized		$	6,862			$	3,301		$	11,003		$	6,363

Related_Party_Transactions

Related Party Transactions	6 Months Ended
	Jun. 30, 2014
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 income, was $1.0 million, $1.9 million, $0.9 million and $1.9 million for the three and six months ended June 30, 2014 and 2013, respectively. We also recorded expenses of $4.7 million, $8.2 million, $4.3 million and $8.4 million for the three and six months ended June 30, 2014 and 2013, respectively, for these services (excluding services provided directly to tenants).
	Marketing Services
	A-List Marketing, LLC, or A-List, provides marketing services to us. Deena Wolff, a sister of Marc Holliday, our chief executive officer, is the owner of A-List. We recorded approximately $77,100, $94,900, $104,900 and $107,300 for the three and six months ended June 30, 2014 and 2013, respectively, for these services.
	Leases
	Nancy Peck and Company leases 1,003 square feet of space at 420 Lexington Avenue under a lease that ends in August 2015. Nancy Peck and Company is owned by Nancy Peck, the wife of Stephen L. Green. The rent due pursuant to the lease was $35,516 per annum for year one increasing to $40,000 in year seven.
	Management Fees
	S.L. Green Management Corp., a consolidated entity, receives property management fees from an entity in which Stephen L. Green owns an interest. We received management fees from such entity of approximately $111,600, $216,400, $95,500 and $213,700 for the three and six months ended June 30, 2014 and 2013, respectively.
	Other
	Amounts due from related parties at June 30, 2014 and December 31, 2013 consisted of the following (in thousands):
		30-Jun-14		December 31, 2013
	Due from joint ventures	$	1,484	$	2,376
	Other	7,431		6,154
	Related party receivables	$	8,915	$	8,530

Noncontrolling_Interests_on_th

Noncontrolling Interests on the Company's Consolidated Financial Statements	6 Months Ended
	Jun. 30, 2014
Noncontrolling Interest [Abstract]	'
Noncontrolling Interests on the Company's Consolidated Financial Statements	'
	Noncontrolling Interests on the Company's Consolidated Financial Statements
	Noncontrolling interests represent the common and preferred units of limited partnership interest in the Operating Partnership not held by the Company as well as third party equity interests in our other consolidated subsidiaries. Noncontrolling interests in the Operating Partnership are shown in the mezzanine equity while the noncontrolling interests in our other consolidated subsidiaries are shown in the equity section of the Company’s consolidated financial statements.
	Common Units of Limited Partnership Interest in the Operating Partnership
	As of June 30, 2014 and December 31, 2013, the noncontrolling interest unit holders owned 3.53%, or 3,500,060 units, and 2.96%, or 2,902,317 units, of the Operating Partnership, respectively. At June 30, 2014, 3,500,060 shares of SL Green's common stock were reserved for issuance upon redemption of units of limited partnership interest of the Operating Partnership.
	Noncontrolling interests in the Operating Partnership is recorded at the greater of its cost basis or fair market value based on the closing stock price of SL Green's common stock at the end of the reporting period.
	Below is the rollforward analysis of the activity relating to the noncontrolling interests in the Operating Partnership as of June 30, 2014, and December 31, 2013 (in thousands):
		30-Jun-14			December 31, 2013
	Balance at beginning of period	$	265,476		$	212,907
	Distributions	(3,598		)	(4,146		)
	Issuance of common units	19,460			24,750
	Redemption of common units	(23,066		)	(17,287		)
	Net income	13,374			3,023
	Accumulated other comprehensive income allocation	234			611
	Fair value adjustment	107,925			45,618
	Balance at end of period	$	379,805		$	265,476
	Preferred Units of Limited Partnership Interest in the Operating Partnership
	The Operating Partnership has 1,902,000 4.5% Series G Preferred Units of limited partnership interest, or the Series G Preferred Units, 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 80,000 6.0% Series H Preferred Units of limited partnership interest, or the Series H Preferred Units, with a mandatory liquidation preference of $25.00 per unit, which were issued in November 2011 in conjunction with an acquisition. The Series H Preferred unitholders receive annual dividends of $1.50 per unit paid on a quarterly basis and dividends are cumulative, subject to certain provisions. The Series H Preferred Units can be redeemed at any time at par for cash at the Operating Partnership’s option or the option of the unitholder.
	The Operating Partnership has 60 Series F Preferred Units outstanding with a mandatory liquidation preference of $1,000.00 per unit.

Stockholders_Equity_of_the_Com

Stockholders' Equity of the Company	6 Months Ended
	Jun. 30, 2014
Stockholders' Equity Note [Abstract]	'
Stockholders' Equity of the Company	'
	Stockholders’ Equity of the Company
	Common Stock
	Our authorized capital stock consists of 260,000,000 shares, $0.01 par value per share, consisting of 160,000,000 shares of common stock, $0.01 par value per share, 75,000,000 shares of excess stock, at $0.01 par value per share, and 25,000,000 shares of preferred stock, par value $0.01 per share. As of June 30, 2014, 95,587,301 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 of $250.0 million of SL Green's common stock. During the six months ended June 30, 2014, we sold 25,659 shares of our common stock out of the remaining balance of this ATM Program for aggregate net proceeds of $2.8 million. The net proceeds from this offering 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 a new ATM Program to sell an aggregate of $300.0 million of SL Green's common stock. During the six months ended June 30, 2014, we sold 55,765 shares of our common stock for aggregate net proceeds of $6.1 million. The net proceeds from this offering were contributed to the Operating Partnership in exchange for 55,765 units of limited partnership interest of the Operating Partnership. As of June 30, 2014, $293.8 million remained available for issuance of common stock under the new ATM Program.
	Perpetual Preferred Stock
	We have 9,200,000 shares of our 6.50% Series I Cumulative Redeemable Preferred Stock, or the Series I Preferred Stock, outstanding with a mandatory liquidation preference of $25.00 per share. The Series I Preferred stockholders receive annual dividends of $1.625 per share paid on a quarterly basis and dividends are cumulative, subject to certain provisions. We are entitled to redeem the Series I Preferred Stock at par for cash at our option on or after August 10, 2017. The proceeds from this issuance of Series I Preferred Stock were contributed to the Operating Partnership in exchange of 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 March 2012, the Company filed a registration statement with the SEC for our dividend reinvestment and stock purchase plan, or DRIP, which automatically became effective upon filing. The Company registered 3,500,000 shares of SL Green's common stock under the DRIP. The DRIP commenced on September 24, 2001.
	During the six months ended June 30, 2014, the Company issued 272 shares of SL Green's common stock and received approximately $26,000 of proceeds, respectively, from dividend reinvestments and/or stock purchases under the DRIP. DRIP shares may be issued at a discount to the market price.
	Earnings per Share
	SL Green's earnings per share for the three and six months ended June 30, 2014 and 2013 is computed as follows (in thousands):
		Three Months Ended June 30,						Six Months Ended June 30,
	Numerator	2014			2013			2014		2013
	Basic Earnings:
	Income attributable to SL Green common stockholders	$	235,541		$	8,276		$	381,631	$	27,185
	Effect of Dilutive Securities:
	Redemption of units to common shares	8,645			244			13,374		799
	Diluted Earnings:
	Income attributable to SL Green common stockholders	$	244,186		$	8,520		$	395,005	$	27,984
		Three Months Ended June 30,					Six Months Ended June 30,
	Denominator	2014		2013			2014		2013
	Basic Shares:
	Weighted average common stock outstanding	95,455		91,660			95,288		91,530
	Effect of Dilutive Securities:
	Redemption of units to common shares	3,515		2,652			3,339		2,694
	Stock-based compensation plans	514		224			501		228
	Diluted weighted average common stock outstanding	99,484		94,536			99,128		94,452
	SL Green has excluded 748,000, 797,000, 894,000 and 939,000 common stock equivalents from the diluted shares outstanding for the three and six months ended June 30, 2014 and 2013, respectively, as they were anti-dilutive.
	Partners' Capital of the Operating Partnership
	The Company is the sole general partner of the Operating Partnership and at June 30, 2014 owned 95,587,301 general and limited partnership interests in the Operating Partnership and 9,200,000 Series I Preferred Units. Partnership interests in the Operating Partnership are denominated as “common units of limited partnership interest” (also referred to as “OP Units”) or “preferred units of limited partnership interest” (also referred to as “Preferred Units”). All references to OP Units and Preferred Units outstanding exclude such units held by the Company. A holder of an OP Unit may present such OP Unit to the Operating Partnership for redemption at any time (subject to restrictions agreed upon at the issuance of OP Units to particular holders that may restrict such right for a period of time, generally one year from issuance). Upon presentation of an OP Unit for redemption, the Operating Partnership must redeem such OP Unit in exchange for the cash equal to the then value of a share of common stock of the Company, except that the Company may, at its election, in lieu of cash redemption, acquire such OP Unit for one share of common stock. Because the number of shares of common stock outstanding at all times equals the number of OP Units that the Company owns, one share of common stock is generally the economic equivalent of one OP Unit, and the quarterly distribution that may be paid to the holder of an OP Unit equals the quarterly dividend that may be paid to the holder of a share of common stock. Each series of Preferred Units makes a distribution that is set in accordance with an amendment to the partnership agreement of the Operating Partnership. Preferred Units may also be convertible into OP Units at the election of the holder thereof or the Company, subject to the terms of such Preferred Units.
	Net income (loss) allocated to the preferred unitholders and common unitholders reflects their pro rata share of net income (loss) and distributions.
	Limited Partner Units
	As of June 30, 2014, limited partners other than SL Green owned 3.53%, or 3,500,060, common units, of the Operating Partnership.
	Preferred Units
	Preferred units not owned by SL Green are further described in Note 11, “Noncontrolling Interests on the Company’s Consolidated Financial Statements - Preferred Units of Limited Partnership Interest in the Operating Partnership.”
	Earnings per Unit
	The Operating Partnership's earnings per unit for the three and six months ended June 30, 2014 and 2013 is computed as follows (in thousands):
		Three Months Ended June 30,						Six Months Ended June 30,
	Numerator	2014			2013			2014		2013
	Basic and Diluted Earnings:
	Income attributable to SLGOP common unitholders	$	244,186		$	8,520		$	395,005	$	27,984
		Three Months Ended June 30,					Six Months Ended June 30,
	Denominator	2014		2013			2014		2013
	Basic units:
	Weighted average common units outstanding	98,970		94,312			98,627		94,224
	Effect of Dilutive Securities:
	Stock-based compensation plans	514		224			501		228
	Diluted weighted average common units outstanding	99,484		94,536			99,128		94,452
	The Operating Partnership excluded 748,000, 797,000, 894,000 and 939,000 common unit equivalents from the diluted units outstanding for the three and six months ended June 30, 2014 and 2013, respectively, as they were anti-dilutive.

Partners_Capital_of_the_Operat

Partners' Capital of the Operating Partnership	6 Months Ended
	Jun. 30, 2014
Equity [Abstract]	'
Partners' Capital of the Operating Partnership	'
	Stockholders’ Equity of the Company
	Common Stock
	Our authorized capital stock consists of 260,000,000 shares, $0.01 par value per share, consisting of 160,000,000 shares of common stock, $0.01 par value per share, 75,000,000 shares of excess stock, at $0.01 par value per share, and 25,000,000 shares of preferred stock, par value $0.01 per share. As of June 30, 2014, 95,587,301 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 of $250.0 million of SL Green's common stock. During the six months ended June 30, 2014, we sold 25,659 shares of our common stock out of the remaining balance of this ATM Program for aggregate net proceeds of $2.8 million. The net proceeds from this offering 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 a new ATM Program to sell an aggregate of $300.0 million of SL Green's common stock. During the six months ended June 30, 2014, we sold 55,765 shares of our common stock for aggregate net proceeds of $6.1 million. The net proceeds from this offering were contributed to the Operating Partnership in exchange for 55,765 units of limited partnership interest of the Operating Partnership. As of June 30, 2014, $293.8 million remained available for issuance of common stock under the new ATM Program.
	Perpetual Preferred Stock
	We have 9,200,000 shares of our 6.50% Series I Cumulative Redeemable Preferred Stock, or the Series I Preferred Stock, outstanding with a mandatory liquidation preference of $25.00 per share. The Series I Preferred stockholders receive annual dividends of $1.625 per share paid on a quarterly basis and dividends are cumulative, subject to certain provisions. We are entitled to redeem the Series I Preferred Stock at par for cash at our option on or after August 10, 2017. The proceeds from this issuance of Series I Preferred Stock were contributed to the Operating Partnership in exchange of 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 March 2012, the Company filed a registration statement with the SEC for our dividend reinvestment and stock purchase plan, or DRIP, which automatically became effective upon filing. The Company registered 3,500,000 shares of SL Green's common stock under the DRIP. The DRIP commenced on September 24, 2001.
	During the six months ended June 30, 2014, the Company issued 272 shares of SL Green's common stock and received approximately $26,000 of proceeds, respectively, from dividend reinvestments and/or stock purchases under the DRIP. DRIP shares may be issued at a discount to the market price.
	Earnings per Share
	SL Green's earnings per share for the three and six months ended June 30, 2014 and 2013 is computed as follows (in thousands):
		Three Months Ended June 30,						Six Months Ended June 30,
	Numerator	2014			2013			2014		2013
	Basic Earnings:
	Income attributable to SL Green common stockholders	$	235,541		$	8,276		$	381,631	$	27,185
	Effect of Dilutive Securities:
	Redemption of units to common shares	8,645			244			13,374		799
	Diluted Earnings:
	Income attributable to SL Green common stockholders	$	244,186		$	8,520		$	395,005	$	27,984
		Three Months Ended June 30,					Six Months Ended June 30,
	Denominator	2014		2013			2014		2013
	Basic Shares:
	Weighted average common stock outstanding	95,455		91,660			95,288		91,530
	Effect of Dilutive Securities:
	Redemption of units to common shares	3,515		2,652			3,339		2,694
	Stock-based compensation plans	514		224			501		228
	Diluted weighted average common stock outstanding	99,484		94,536			99,128		94,452
	SL Green has excluded 748,000, 797,000, 894,000 and 939,000 common stock equivalents from the diluted shares outstanding for the three and six months ended June 30, 2014 and 2013, respectively, as they were anti-dilutive.
	Partners' Capital of the Operating Partnership
	The Company is the sole general partner of the Operating Partnership and at June 30, 2014 owned 95,587,301 general and limited partnership interests in the Operating Partnership and 9,200,000 Series I Preferred Units. Partnership interests in the Operating Partnership are denominated as “common units of limited partnership interest” (also referred to as “OP Units”) or “preferred units of limited partnership interest” (also referred to as “Preferred Units”). All references to OP Units and Preferred Units outstanding exclude such units held by the Company. A holder of an OP Unit may present such OP Unit to the Operating Partnership for redemption at any time (subject to restrictions agreed upon at the issuance of OP Units to particular holders that may restrict such right for a period of time, generally one year from issuance). Upon presentation of an OP Unit for redemption, the Operating Partnership must redeem such OP Unit in exchange for the cash equal to the then value of a share of common stock of the Company, except that the Company may, at its election, in lieu of cash redemption, acquire such OP Unit for one share of common stock. Because the number of shares of common stock outstanding at all times equals the number of OP Units that the Company owns, one share of common stock is generally the economic equivalent of one OP Unit, and the quarterly distribution that may be paid to the holder of an OP Unit equals the quarterly dividend that may be paid to the holder of a share of common stock. Each series of Preferred Units makes a distribution that is set in accordance with an amendment to the partnership agreement of the Operating Partnership. Preferred Units may also be convertible into OP Units at the election of the holder thereof or the Company, subject to the terms of such Preferred Units.
	Net income (loss) allocated to the preferred unitholders and common unitholders reflects their pro rata share of net income (loss) and distributions.
	Limited Partner Units
	As of June 30, 2014, limited partners other than SL Green owned 3.53%, or 3,500,060, common units, of the Operating Partnership.
	Preferred Units
	Preferred units not owned by SL Green are further described in Note 11, “Noncontrolling Interests on the Company’s Consolidated Financial Statements - Preferred Units of Limited Partnership Interest in the Operating Partnership.”
	Earnings per Unit
	The Operating Partnership's earnings per unit for the three and six months ended June 30, 2014 and 2013 is computed as follows (in thousands):
		Three Months Ended June 30,						Six Months Ended June 30,
	Numerator	2014			2013			2014		2013
	Basic and Diluted Earnings:
	Income attributable to SLGOP common unitholders	$	244,186		$	8,520		$	395,005	$	27,984
		Three Months Ended June 30,					Six Months Ended June 30,
	Denominator	2014		2013			2014		2013
	Basic units:
	Weighted average common units outstanding	98,970		94,312			98,627		94,224
	Effect of Dilutive Securities:
	Stock-based compensation plans	514		224			501		228
	Diluted weighted average common units outstanding	99,484		94,536			99,128		94,452
	The Operating Partnership excluded 748,000, 797,000, 894,000 and 939,000 common unit equivalents from the diluted units outstanding for the three and six months ended June 30, 2014 and 2013, respectively, as they were anti-dilutive.

Sharebased_Compensation

Share-based Compensation	6 Months Ended
	Jun. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Share-based Compensation	'
	Share-based Compensation
	We have a stock-based employee and director compensation plans. Our employees are compensated through the Operating Partnership. Under each plan, whenever the Company issues common or preferred stock, the Operating Partnership issues an equivalent number of units of limited partnership interest of a corresponding class to the Company.
	Third Amended and Restated 2005 Stock Option and Incentive Plan
	The Third Amended and Restated 2005 Stock Option and Incentive Plan, or the 2005 Plan, was approved by the Company's board of directors in April 2013 and its stockholders in June 2013 at the Company's annual meeting of stockholders. The 2005 Plan authorizes the issuance of stock options, stock appreciation rights, unrestricted and restricted stock, phantom shares, dividend equivalent rights and other equity-based awards. Subject to adjustments upon certain corporate transactions or events, awards with respect to up to a maximum of 17,130,000 fungible units may be granted under the 2005 Plan. Currently, different types of awards count against the limit on the number of fungible units differently, with (1) full-value awards (i.e., those that deliver the full value of the award upon vesting, such as restricted stock) counting as 2.76 fungible units per share subject to such award (2) stock options, stock appreciation rights and other awards that do not deliver full value and expire five years from the date of grant counting as 0.77 fungible units per share subject to such award and (3) all other awards (e.g., ten-year stock options) counting as 1.0 fungible units per share subject to such award. Awards granted under the 2005 Plan prior to the approval of the second amendment and restatement in June 2010 and third amendment and restatement in June 2013 continue to count against the fungible unit limit based on the ratios that were in effect at the time such awards were granted, which may be different than the current ratios. As a result, depending on the types of awards issued, the 2005 Plan may result in the issuance of more or less than 17,130,000 shares. If a stock option or other award granted under the 2005 Plan expires or terminates, the common stock subject to any portion of the award that expires or terminates without having been exercised or paid, as the case may be, will again become available for the issuance of additional awards. Shares of SL Green's common stock distributed under the 2005 Plan may be treasury shares or authorized but unissued shares. Currently, unless the 2005 Plan has been previously terminated by the Company's board of directors, new awards may be granted under the 2005 Plan until June 13, 2023, which is the tenth anniversary of the date that the 2005 Plan was most recently approved by the Company's stockholders. As of June 30, 2014, 3,200,000 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, which remain subject to performance-based vesting.
	Options are granted under the plan at the fair market value on the date of grant and, subject to employment, generally expire five or ten years from the date of grant, are not transferable other than on death, and generally vest in one to five years commencing one year from the date of grant.
	The fair value of each stock option granted is estimated on the date of grant using the Black-Scholes option pricing model based on historical information with the following weighted average assumptions for grants during the six months ended June 30, 2014 and the year ended December 31, 2013.
		30-Jun-14			December 31, 2013
	Dividend yield	1.8	%		1.92	%
	Expected life of option	3.7 years			4.1 years
	Risk-free interest rate	0.94	%		0.96	%
	Expected stock price volatility	35	%		36.12	%
	A summary of the status of the Company's stock options as of June 30, 2014 and December 31, 2013 and changes during the six months ended June 30, 2014 and the year ended December 31, 2013 are as follows:
		30-Jun-14							December 31, 2013
		Options				Weighted			Options			Weighted
		Outstanding				Average			Outstanding			Average
						Exercise						Exercise
						Price						Price
	Balance at beginning of year	1,765,034				$	83.24		1,201,000			$	75.05
	Granted	3,000				98.58			828,100			87.23
	Exercised	(277,145		)		71.27			(223,531		)	53.93
	Lapsed or cancelled	(26,984		)		83.81			(40,535		)	83.94
	Balance at end of period	1,463,905				$	85.53		1,765,034			$	83.24
	Options exercisable at end of period	456,464				$	88.98		461,458			$	89.38
	Weighted average fair value of options granted during the period	$	69,805						$	18,041,576
	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 4.40 years and the remaining average contractual life of the options exercisable was 3.76 years.
	During the three and six months ended June 30, 2014 and 2013, we recognized $2.0 million, $4.1 million, $1.3 million and $2.6 million of compensation expense, respectively, for these options. As of June 30, 2014, there was $15.8 million of total unrecognized compensation cost related to unvested stock options, which is expected to be recognized over a weighted average period of three years.
	Stock-based Compensation
	Effective January 1, 1999, the Company implemented a deferred compensation plan, or the Deferred Plan, where shares issued under the Deferred Plan were granted to certain employees, including our executives, and vesting will occur annually upon the completion of a service period or our meeting established financial performance criteria. Annual vesting occurs at rates ranging from 15% to 35% once performance criteria are reached.
	A summary of the Company's restricted stock as of June 30, 2014 and December 31, 2013 and charges during the six months ended June 30, 2014 and the year ended December 31, 2013 are presented below:
		30-Jun-14				December 31, 2013
	Balance at beginning of year	2,994,197				2,804,901
	Granted	—				192,563
	Cancelled	(1,434		)		(3,267		)
	Balance at end of period	2,992,763				2,994,197
	Vested during the period	69,293				21,074
	Compensation expense recorded	$	4,678,269			$	6,713,155
	Weighted average fair value of restricted stock granted during the period	$	—			$	17,386,949
	The fair value of restricted stock that vested during the six months ended June 30, 2014 and the year ended December 31, 2013 was $5.1 million and $1.6 million, respectively. As of June 30, 2014, there was $14.2 million of total unrecognized compensation cost related to unvested restricted stock, which is expected to be recognized over a weighted average period of 2.3 years.
	For the three and six months ended June 30, 2014 and 2013, $1.9 million, $3.5 million, $1.0 million and $2.0 million, respectively, was capitalized to assets associated with compensation expense related to our long-term compensation plans, restricted stock and stock options.
	We granted LTIP units, which include bonus, time-based and performance based awards, with a fair value of $21.2 million, and $27.1 million as of June 30, 2014 and December 31, 2013, respectively. The grant date fair value of the LTIP unit awards was calculated in accordance with ASC 718. A third party consultant determined the fair value of the LTIP units to have a discount from SL Green's common stock price. The discount was calculated by considering the inherent uncertainty that the LTIP units will reach parity with other common partnership units and the illiquidity due to transfer restrictions. As of June 30, 2014, there was $6.7 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 1.1 years. During the three and six months ended June 30, 2014 and 2013, we recorded compensation expense related to bonus, time-based and performance based awards of $2.1 million, $10.3 million, $0.8 million and $1.6 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 approximately $15.0 million up to approximately $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, approximately $25.0 million of awards could be earned at any time after the beginning of the second year and an additional approximately $25.0 million of awards could be earned at any time after the beginning of the third year. In order to achieve maximum performance under the 2010 Long-Term Compensation Plan, the Company's aggregate stock price appreciation during the performance period had to equal or exceed 50%. The compensation committee determined that maximum performance had been achieved at or shortly after the beginning of each of the second and third years of the performance period and for the full performance period and, accordingly, 366,815 LTIP Units, 385,583 LTIP Units and 327,416 LTIP Units were earned under the 2010 Long-Term Compensation Plan in December 2010, 2011 and 2012, respectively. Substantially in accordance with the original terms of the program, 50% of these LTIP Units vested on December 17, 2012 (accelerated from the original January 1, 2013 vesting date), 25% of these LTIP Units vested on December 11, 2013 (accelerated from the original January 1, 2014 vesting date) and the remainder is scheduled to vest 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 (approximately $31.7 million, subject to forfeitures) will be amortized into earnings through the final vesting period. We recorded compensation expense of $1.6 million, $1.9 million, $0.8 million and $2.8 million during the three and six months ended June 30, 2014 and 2013, respectively, related to the 2010 Long-Term Compensation Plan.
	2011 Outperformance Plan
	In August 2011, the compensation committee of the Company's board of directors approved the general terms of the SL Green Realty Corp. 2011 Outperformance Plan, or the 2011 Outperformance Plan. Participants in the 2011 Outperformance Plan may 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 will be entitled to share in a "performance pool" comprised of LTIP Units with a value equal to 10% of the amount, if any, by which our total return to stockholders during the three-year period exceeds a cumulative total return to stockholders of 25%, subject to the maximum of $85.0 million of LTIP Units; provided that if maximum performance has been achieved, approximately one-third of each award may be earned at any time after the beginning of the second year and an additional approximately one-third of each award may be earned at any time after the beginning of the third year. LTIP Units earned under the 2011 Outperformance Plan will be subject to continued vesting requirements, with 50% of any awards earned vesting on August 31, 2014 and the remaining 50% vesting on August 31, 2015, subject to continued employment with us through such dates. Participants will not be entitled to distributions with respect to LTIP Units granted under the 2011 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 additional LTIP Units. Thereafter, distributions will 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. The remaining one-third of each award will be earned based on performance through end of the performance period.
	The cost of the 2011 Outperformance Plan (approximately $27.0 million, subject to forfeitures) will be amortized into earnings through the final vesting period. We recorded compensation expense of $4.3 million, $6.1 million, $1.7 million and $4.5 million during the three and six months ended June 30, 2014 and 2013, respectively, related to the 2011 Outperformance Plan.
	Deferred Compensation Plan for Directors
	Under our Non-Employee Director's Deferral Program, which commenced July 2004, the Company's non-employee directors may elect to defer up to 100% of their annual retainer fee, chairman fees, meeting fees and annual stock grant. Unless otherwise elected by a participant, fees deferred under the program shall be credited in the form of phantom stock units. The program provides that a director's phantom stock units generally will be settled in an equal number of shares of common stock upon the earlier of (i) the January 1 coincident with or next following such director's termination of service from the Board of Directors or (ii) a change in control by us, as defined by the program. Phantom stock units are credited to each non-employee director quarterly using the closing price of SL Green's common stock on the first business day of the respective quarter. Each participating non-employee director is also credited with dividend equivalents or phantom stock units based on the dividend rate for each quarter, which are either paid in cash currently or credited to the director’s account as additional phantom stock units.
	During the six months ended June 30, 2014, 5,974 phantom stock units were earned. As of June 30, 2014, there were 79,499 phantom stock units outstanding pursuant to our Non-Employee Director's Deferral Program.
	Employee Stock Purchase Plan
	On September 18, 2007, the Company's board of directors adopted the 2008 Employee Stock Purchase Plan, or ESPP, to encourage our employees to increase their efforts to make our business more successful by providing equity-based incentives to eligible employees. The ESPP is intended to qualify as an "employee stock purchase plan" under Section 423 of the Code, and has been adopted by the board to enable our eligible employees to purchase the Company's shares of common stock through payroll deductions. The ESPP became effective on January 1, 2008 with a maximum of 500,000 shares of the common stock available for issuance, subject to adjustment upon a merger, reorganization, stock split or other similar corporate change. The Company filed a registration statement on Form S-8 with the SEC with respect to the ESPP. The common stock is offered for purchase through a series of successive offering periods. Each offering period will be three months in duration and will begin on the first day of each calendar quarter, with the first offering period having commenced on January 1, 2008. The ESPP provides for eligible employees to purchase the common stock at a purchase price equal to 85% of the lesser of (1) the market value of the common stock on the first day of the offering period or (2) the market value of the common stock on the last day of the offering period. The ESPP was approved by our stockholders at our 2008 annual meeting of stockholders. As of June 30, 2014, 76,727 shares of SL Green's common stock had been issued under the ESPP.

Accumulated_Other_Comprehensiv

Accumulated Other Comprehensive Loss of the Company	6 Months Ended
	Jun. 30, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]	'
Accumulated Other Comprehensive Loss of the Company	'
	Stockholders’ Equity of the Company
	Common Stock
	Our authorized capital stock consists of 260,000,000 shares, $0.01 par value per share, consisting of 160,000,000 shares of common stock, $0.01 par value per share, 75,000,000 shares of excess stock, at $0.01 par value per share, and 25,000,000 shares of preferred stock, par value $0.01 per share. As of June 30, 2014, 95,587,301 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 of $250.0 million of SL Green's common stock. During the six months ended June 30, 2014, we sold 25,659 shares of our common stock out of the remaining balance of this ATM Program for aggregate net proceeds of $2.8 million. The net proceeds from this offering 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 a new ATM Program to sell an aggregate of $300.0 million of SL Green's common stock. During the six months ended June 30, 2014, we sold 55,765 shares of our common stock for aggregate net proceeds of $6.1 million. The net proceeds from this offering were contributed to the Operating Partnership in exchange for 55,765 units of limited partnership interest of the Operating Partnership. As of June 30, 2014, $293.8 million remained available for issuance of common stock under the new ATM Program.
	Perpetual Preferred Stock
	We have 9,200,000 shares of our 6.50% Series I Cumulative Redeemable Preferred Stock, or the Series I Preferred Stock, outstanding with a mandatory liquidation preference of $25.00 per share. The Series I Preferred stockholders receive annual dividends of $1.625 per share paid on a quarterly basis and dividends are cumulative, subject to certain provisions. We are entitled to redeem the Series I Preferred Stock at par for cash at our option on or after August 10, 2017. The proceeds from this issuance of Series I Preferred Stock were contributed to the Operating Partnership in exchange of 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 March 2012, the Company filed a registration statement with the SEC for our dividend reinvestment and stock purchase plan, or DRIP, which automatically became effective upon filing. The Company registered 3,500,000 shares of SL Green's common stock under the DRIP. The DRIP commenced on September 24, 2001.
	During the six months ended June 30, 2014, the Company issued 272 shares of SL Green's common stock and received approximately $26,000 of proceeds, respectively, from dividend reinvestments and/or stock purchases under the DRIP. DRIP shares may be issued at a discount to the market price.
	Earnings per Share
	SL Green's earnings per share for the three and six months ended June 30, 2014 and 2013 is computed as follows (in thousands):
			Three Months Ended June 30,							Six Months Ended June 30,
	Numerator		2014			2013				2014			2013
	Basic Earnings:
	Income attributable to SL Green common stockholders		$	235,541		$	8,276			$	381,631		$	27,185
	Effect of Dilutive Securities:
	Redemption of units to common shares		8,645			244				13,374			799
	Diluted Earnings:
	Income attributable to SL Green common stockholders		$	244,186		$	8,520			$	395,005		$	27,984
			Three Months Ended June 30,					Six Months Ended June 30,
	Denominator		2014		2013			2014			2013
	Basic Shares:
	Weighted average common stock outstanding		95,455		91,660			95,288			91,530
	Effect of Dilutive Securities:
	Redemption of units to common shares		3,515		2,652			3,339			2,694
	Stock-based compensation plans		514		224			501			228
	Diluted weighted average common stock outstanding		99,484		94,536			99,128			94,452
	SL Green has excluded 748,000, 797,000, 894,000 and 939,000 common stock equivalents from the diluted shares outstanding for the three and six months ended June 30, 2014 and 2013, respectively, as they were anti-dilutive.
	Partners' Capital of the Operating Partnership
	The Company is the sole general partner of the Operating Partnership and at June 30, 2014 owned 95,587,301 general and limited partnership interests in the Operating Partnership and 9,200,000 Series I Preferred Units. Partnership interests in the Operating Partnership are denominated as “common units of limited partnership interest” (also referred to as “OP Units”) or “preferred units of limited partnership interest” (also referred to as “Preferred Units”). All references to OP Units and Preferred Units outstanding exclude such units held by the Company. A holder of an OP Unit may present such OP Unit to the Operating Partnership for redemption at any time (subject to restrictions agreed upon at the issuance of OP Units to particular holders that may restrict such right for a period of time, generally one year from issuance). Upon presentation of an OP Unit for redemption, the Operating Partnership must redeem such OP Unit in exchange for the cash equal to the then value of a share of common stock of the Company, except that the Company may, at its election, in lieu of cash redemption, acquire such OP Unit for one share of common stock. Because the number of shares of common stock outstanding at all times equals the number of OP Units that the Company owns, one share of common stock is generally the economic equivalent of one OP Unit, and the quarterly distribution that may be paid to the holder of an OP Unit equals the quarterly dividend that may be paid to the holder of a share of common stock. Each series of Preferred Units makes a distribution that is set in accordance with an amendment to the partnership agreement of the Operating Partnership. Preferred Units may also be convertible into OP Units at the election of the holder thereof or the Company, subject to the terms of such Preferred Units.
	Net income (loss) allocated to the preferred unitholders and common unitholders reflects their pro rata share of net income (loss) and distributions.
	Limited Partner Units
	As of June 30, 2014, limited partners other than SL Green owned 3.53%, or 3,500,060, common units, of the Operating Partnership.
	Preferred Units
	Preferred units not owned by SL Green are further described in Note 11, “Noncontrolling Interests on the Company’s Consolidated Financial Statements - Preferred Units of Limited Partnership Interest in the Operating Partnership.”
	Earnings per Unit
	The Operating Partnership's earnings per unit for the three and six months ended June 30, 2014 and 2013 is computed as follows (in thousands):
			Three Months Ended June 30,							Six Months Ended June 30,
	Numerator		2014			2013				2014			2013
	Basic and Diluted Earnings:
	Income attributable to SLGOP common unitholders		$	244,186		$	8,520			$	395,005		$	27,984
			Three Months Ended June 30,					Six Months Ended June 30,
	Denominator		2014		2013			2014			2013
	Basic units:
	Weighted average common units outstanding		98,970		94,312			98,627			94,224
	Effect of Dilutive Securities:
	Stock-based compensation plans		514		224			501			228
	Diluted weighted average common units outstanding		99,484		94,536			99,128			94,452
	The Operating Partnership excluded 748,000, 797,000, 894,000 and 939,000 common unit equivalents from the diluted units outstanding for the three and six months ended June 30, 2014 and 2013, respectively, as they were anti-dilutive.
SL Green Realty Corp	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'
Accumulated Other Comprehensive Loss of the Company	'
	Accumulated Other Comprehensive Loss of the Company
	The following tables set forth the changes in accumulated other comprehensive income (loss) by component as of June 30, 2014:
		Net unrealized loss on derivative instruments (1)			SL Green’s share of joint venture net unrealized income (loss) on derivative instruments (2)				Unrealized gains and loss on marketable securities			Total
	Balance at December 31, 2013	$	(15,125	)	$	(4,870	)		$	4,784		$	(15,211	)
	Other comprehensive income (loss) before reclassifications	(420		)	4,068				1,702			5,350
	Amounts reclassified from accumulated other comprehensive income	1,898			1,767				—			3,665
	Balance at June 30, 2014	$	(13,647	)	$	965			$	6,486		$	(6,196	)
	___________________________
	-1	Amounts reclassified from accumulated other comprehensive income (loss) are included in interest expense in the respective consolidated statements of income. As of June 30, 2014 and December 31, 2013, the deferred net losses from these terminated hedges, which are included in accumulated other comprehensive loss relating to net unrealized loss on derivative instrument, were $12.8 million and $13.8 million, respectively.
	-2	Amounts reclassified from accumulated other comprehensive income are included in equity in net income from unconsolidated joint ventures in the respective consolidated statements of income.

Accumulated_Other_Comprehensiv1

Accumulated Other Comprehensive Loss of the Operating Partnership	6 Months Ended
	Jun. 30, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]	'
Accumulated Other Comprehensive Loss of the Company	'
	Stockholders’ Equity of the Company
	Common Stock
	Our authorized capital stock consists of 260,000,000 shares, $0.01 par value per share, consisting of 160,000,000 shares of common stock, $0.01 par value per share, 75,000,000 shares of excess stock, at $0.01 par value per share, and 25,000,000 shares of preferred stock, par value $0.01 per share. As of June 30, 2014, 95,587,301 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 of $250.0 million of SL Green's common stock. During the six months ended June 30, 2014, we sold 25,659 shares of our common stock out of the remaining balance of this ATM Program for aggregate net proceeds of $2.8 million. The net proceeds from this offering 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 a new ATM Program to sell an aggregate of $300.0 million of SL Green's common stock. During the six months ended June 30, 2014, we sold 55,765 shares of our common stock for aggregate net proceeds of $6.1 million. The net proceeds from this offering were contributed to the Operating Partnership in exchange for 55,765 units of limited partnership interest of the Operating Partnership. As of June 30, 2014, $293.8 million remained available for issuance of common stock under the new ATM Program.
	Perpetual Preferred Stock
	We have 9,200,000 shares of our 6.50% Series I Cumulative Redeemable Preferred Stock, or the Series I Preferred Stock, outstanding with a mandatory liquidation preference of $25.00 per share. The Series I Preferred stockholders receive annual dividends of $1.625 per share paid on a quarterly basis and dividends are cumulative, subject to certain provisions. We are entitled to redeem the Series I Preferred Stock at par for cash at our option on or after August 10, 2017. The proceeds from this issuance of Series I Preferred Stock were contributed to the Operating Partnership in exchange of 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 March 2012, the Company filed a registration statement with the SEC for our dividend reinvestment and stock purchase plan, or DRIP, which automatically became effective upon filing. The Company registered 3,500,000 shares of SL Green's common stock under the DRIP. The DRIP commenced on September 24, 2001.
	During the six months ended June 30, 2014, the Company issued 272 shares of SL Green's common stock and received approximately $26,000 of proceeds, respectively, from dividend reinvestments and/or stock purchases under the DRIP. DRIP shares may be issued at a discount to the market price.
	Earnings per Share
	SL Green's earnings per share for the three and six months ended June 30, 2014 and 2013 is computed as follows (in thousands):
			Three Months Ended June 30,							Six Months Ended June 30,
	Numerator		2014			2013				2014			2013
	Basic Earnings:
	Income attributable to SL Green common stockholders		$	235,541		$	8,276			$	381,631		$	27,185
	Effect of Dilutive Securities:
	Redemption of units to common shares		8,645			244				13,374			799
	Diluted Earnings:
	Income attributable to SL Green common stockholders		$	244,186		$	8,520			$	395,005		$	27,984
			Three Months Ended June 30,					Six Months Ended June 30,
	Denominator		2014		2013			2014			2013
	Basic Shares:
	Weighted average common stock outstanding		95,455		91,660			95,288			91,530
	Effect of Dilutive Securities:
	Redemption of units to common shares		3,515		2,652			3,339			2,694
	Stock-based compensation plans		514		224			501			228
	Diluted weighted average common stock outstanding		99,484		94,536			99,128			94,452
	SL Green has excluded 748,000, 797,000, 894,000 and 939,000 common stock equivalents from the diluted shares outstanding for the three and six months ended June 30, 2014 and 2013, respectively, as they were anti-dilutive.
	Partners' Capital of the Operating Partnership
	The Company is the sole general partner of the Operating Partnership and at June 30, 2014 owned 95,587,301 general and limited partnership interests in the Operating Partnership and 9,200,000 Series I Preferred Units. Partnership interests in the Operating Partnership are denominated as “common units of limited partnership interest” (also referred to as “OP Units”) or “preferred units of limited partnership interest” (also referred to as “Preferred Units”). All references to OP Units and Preferred Units outstanding exclude such units held by the Company. A holder of an OP Unit may present such OP Unit to the Operating Partnership for redemption at any time (subject to restrictions agreed upon at the issuance of OP Units to particular holders that may restrict such right for a period of time, generally one year from issuance). Upon presentation of an OP Unit for redemption, the Operating Partnership must redeem such OP Unit in exchange for the cash equal to the then value of a share of common stock of the Company, except that the Company may, at its election, in lieu of cash redemption, acquire such OP Unit for one share of common stock. Because the number of shares of common stock outstanding at all times equals the number of OP Units that the Company owns, one share of common stock is generally the economic equivalent of one OP Unit, and the quarterly distribution that may be paid to the holder of an OP Unit equals the quarterly dividend that may be paid to the holder of a share of common stock. Each series of Preferred Units makes a distribution that is set in accordance with an amendment to the partnership agreement of the Operating Partnership. Preferred Units may also be convertible into OP Units at the election of the holder thereof or the Company, subject to the terms of such Preferred Units.
	Net income (loss) allocated to the preferred unitholders and common unitholders reflects their pro rata share of net income (loss) and distributions.
	Limited Partner Units
	As of June 30, 2014, limited partners other than SL Green owned 3.53%, or 3,500,060, common units, of the Operating Partnership.
	Preferred Units
	Preferred units not owned by SL Green are further described in Note 11, “Noncontrolling Interests on the Company’s Consolidated Financial Statements - Preferred Units of Limited Partnership Interest in the Operating Partnership.”
	Earnings per Unit
	The Operating Partnership's earnings per unit for the three and six months ended June 30, 2014 and 2013 is computed as follows (in thousands):
			Three Months Ended June 30,							Six Months Ended June 30,
	Numerator		2014			2013				2014			2013
	Basic and Diluted Earnings:
	Income attributable to SLGOP common unitholders		$	244,186		$	8,520			$	395,005		$	27,984
			Three Months Ended June 30,					Six Months Ended June 30,
	Denominator		2014		2013			2014			2013
	Basic units:
	Weighted average common units outstanding		98,970		94,312			98,627			94,224
	Effect of Dilutive Securities:
	Stock-based compensation plans		514		224			501			228
	Diluted weighted average common units outstanding		99,484		94,536			99,128			94,452
	The Operating Partnership excluded 748,000, 797,000, 894,000 and 939,000 common unit equivalents from the diluted units outstanding for the three and six months ended June 30, 2014 and 2013, respectively, as they were anti-dilutive.
SL Green Operating Partnership	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'
Accumulated Other Comprehensive Loss of the Company	'
	Accumulated Other Comprehensive Loss of the Operating Partnership
	The following tables set forth the changes in accumulated other comprehensive income (loss) by component as of June 30, 2014:
		Net unrealized loss on derivative instruments (1)			SLGOP’s share of joint venture net unrealized income (loss) on derivative instruments (2)				Unrealized gains and loss on marketable securities			Total
	Balance at December 31, 2013	$	(15,573	)	$	(5,015	)		$	4,926		$	(15,662	)
	Other comprehensive (loss) income before reclassifications	(516		)	4,184				1,788			5,456
	Amounts reclassified from accumulated other comprehensive income	1,964			1,829				—			3,793
	Balance at June 30, 2014	$	(14,125	)	$	998			$	6,714		$	(6,413	)
	___________________________
	-1	Amount reclassified from accumulated other comprehensive income (loss) are included in interest expense in the respective consolidated statements of income. As of June 30, 2014 and December 31, 2013, the deferred net losses from these terminated hedges, which are included in accumulated other comprehensive loss relating to net unrealized loss on derivative instrument, were $13.2 million and $14.2 million, respectively.
	-2	Amounts reclassified from accumulated other comprehensive income are included in equity in net income from unconsolidated joint ventures in the respective consolidated statements of income.

Fair_Value_Measurements

Fair Value Measurements	6 Months Ended
	Jun. 30, 2014
Fair Value Disclosures [Abstract]	'
Fair Value Measurements	'
	Fair Value Measurements
	We are required to disclose the fair value information about our financial instruments, whether or not recognized in the consolidated balance sheets, for which it is practicable to estimate fair value. FASB guidance defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants on the measurement date. We measure and/or disclose the estimated fair value of financial assets and liabilities based on a hierarchy that distinguishes between market participant assumptions based on market data obtained from sources independent of the reporting entity and the reporting entity’s own assumptions about market participant assumptions. This hierarchy consist of three broad levels: Level 1 - quoted prices (unadjusted) in active markets for identical assets or liabilities that the reporting entity can access at the measurement date; Level 2 - inputs other than quoted prices included within Level 1, that are observable for the asset or liability, either directly or indirectly; and Level 3 - unobservable inputs for the asset or liability that are used when little or no market data is available. We follow this hierarchy for our assets and liabilities measured at fair value on a recurring and nonrecurring basis. In instances in which the determination of the fair value measurement is based on inputs from different levels of the fair value hierarchy, the level in the fair value hierarchy within which the entire fair value measurement falls is based on the lowest level of input that is significant to the fair value measurement in its entirety. The Company’s assessment of the significance of the particular input to the fair value measurement in its entirety requires judgment and considers factors specific to the asset or liability.
	The following tables set forth the assets and liabilities that we measure at fair value on a recurring and non-recurring basis by their levels in the fair value hierarchy at June 30, 2014 and December 31, 2013, respectively (in thousands):
		June 30, 2014
		Total		Level 1		Level 2		Level 3
	Assets:
	Marketable securities	$	39,912	$	4,532	$	35,380	$	—
	Liabilities:
	Interest rate swap agreements (included in accrued interest payable and other liabilities)	$	18,454	$	—	$	18,454	$	—
		December 31, 2013
		Total		Level 1		Level 2		Level 3
	Assets:
	Marketable securities	$	32,049	$	4,307	$	24,419	$	3,323
	Liabilities:
	Interest rate swap agreements (included in accrued interest payable and other liabilities)	$	1,329	$	—	$	1,329	$	—
	We determine impairment in real estate investments and debt and preferred equity investments, including intangibles utilizing cash flow projections that apply estimated revenue and expense growth rates, discount rates and capitalization rates, which are classified as Level 3 inputs.
	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, and mortgages and other loans payable and other secured and unsecured debt. The carrying amount of cash and cash equivalents, restricted cash, accounts receivable, and accounts payable and accrued expenses reported in our consolidated balance sheets approximates fair value due to the short term nature of these instruments. The fair value of debt and preferred equity investments, which is classified as Level 3, is estimated by discounting the future cash flows using current interest rates at which similar loans with the same maturities would be made to borrowers with similar credit ratings. The fair value of borrowings, which is classified as Level 3, is estimated by discounting the contractual cash flows of each debt to their present value using adjusted market interest rates, which is provided by a third-party specialist.
	The following table provides the carrying value and fair value of these financial instruments as of June 30, 2014 and December 31, 2013 (in thousands):
		June 30, 2014				December 31, 2013
		Carrying Value		Fair Value		Carrying Value		Fair Value
	Debt and preferred equity investments	$	1,547,808	-1		$	1,304,839	-1
	Fixed rate debt	$	6,096,280	$	6,533,273	$	5,599,960	$	5,886,980
	Variable rate debt	2,261,352		2,279,257		1,319,948		1,327,422
		$	8,357,632	$	8,812,530	$	6,919,908	$	7,214,402
	_____________________________________
	-1	Debt and preferred equity investments had an estimated fair value ranging between $1.5 billion and $1.7 billion at June 30, 2014. At December 31, 2013, debt and preferred equity investments had an estimated fair value ranging between $1.3 billion and $1.4 billion.
	Disclosure about fair value of financial instruments was based on pertinent information available to us as of June 30, 2014 and December 31, 2013. Although we are not aware of any factors that would significantly affect the reasonable fair value amounts, such amounts have not been comprehensively revalued for purposes of these financial statements since that date and current estimates of fair value may differ significantly from the amounts presented herein.

Financial_Instruments_Derivati

Financial Instruments: Derivatives and Hedging	6 Months Ended
	Jun. 30, 2014
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 sheet at fair value. Derivatives that are not hedges are adjusted to fair value through earnings. If a derivative is a hedge, depending on the nature of the hedge, changes in the fair value of the derivative will either be offset against the change in fair value of the hedged asset, liability, or firm commitment through earnings, or recognized in other comprehensive income until the hedged item is recognized in earnings. The ineffective portion of a derivative’s change in fair value will be immediately recognized in earnings. Reported net income and equity may increase or decrease prospectively, depending on future levels of interest rates and other variables affecting the fair values of derivative instruments and hedged items, but will have no effect on cash flows. Currently, all of our designated derivative instruments are effective hedging instruments.
	The following table summarizes the notional and fair value of our consolidated derivative financial instruments at June 30, 2014 based on Level 2 information pursuant to ASC 810-10. 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.
		Notional				Strike			Effective	Expiration	Balance Sheet Location		Fair Value
		Value				Rate			Date	Date			(in thousands)
		(in thousands)
	Interest Rate Cap	$	263,426			6	%		Nov-13	Nov-15	Other Assets		$	4
	Interest Rate Cap	137,500				4	%		Oct-13	Sep-15	Other Assets		3
	Interest Rate Cap	946,000				4.75	%		May-14	May-16	Other Assets		36
	Interest Rate Swap(1)	144,000				2.236	%		Dec-12	Dec-17	Other Liabilities		(5,859		)
	Interest Rate Swap(1)	72,000				2.31	%		Dec-12	Dec-17	Other Liabilities		(3,109		)
	Interest Rate Swap(1)	72,000				2.31	%		Dec-12	Dec-17	Other Liabilities		(3,109		)
	Interest Rate Swap(1)	57,600				1.99	%		Dec-12	Dec-17	Other Liabilities		(1,859		)
	Interest Rate Swap(1)	86,400				1.948	%		Dec-12	Dec-17	Other Liabilities		(2,664		)
	Interest Rate Swap(1)	72,000				1.345	%		Dec-12	Dec-17	Other Liabilities		(747		)
	Interest Rate Swap	30,000				2.295	%		Jul-10	Jun-16	Other Liabilities		(1,078		)
	Interest Rate Swap	8,500				0.74	%		Feb-12	Feb-15	Other Liabilities		(29		)
													$	(18,411	)
	__________________________
	-1	As a result of the acquisition and consolidation of 388-390 Greenwich Street, we have assumed these derivative instruments and have designated them as hedges.
	Gains and losses on terminated hedges are included in the accumulated other comprehensive loss, and are recognized into earnings over the term of the related mortgage obligation. Over time, the realized and unrealized gains and losses held in accumulated other comprehensive loss will be reclassified into earnings as an adjustment to interest expense in the same periods in which the hedged interest payments affect earnings.  We estimate that approximately $7.1 million of the current balance held in accumulated other comprehensive loss will be reclassified into interest expense and $0.8 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 income for the three months ended June 30, 2014 and 2013, respectively (in thousands):
			Amount of Gain or (Loss)							Location of Gain or (Loss) Reclassified from Accumulated Other Comprehensive Income into Income	Amount of Loss						Location of Gain (Loss) Recognized in Income on Derivative	Amount of Gain
			Recognized in								Reclassified from							Recognized
			Other Comprehensive								Accumulated Other							into Income
			Loss								Comprehensive Loss  into Income							(Ineffective Portion)
			(Effective Portion)								(Effective Portion)
			Three Months Ended June 30,								Three Months Ended June 30,							Three Months Ended June 30,
	Derivative		2014				2013				2014				2013			2014		2013
	Interest Rate Swaps/Caps		$	(465	)		$	181		Interest expense	$	1,272			$	470	Interest expense	$	1	$	—
	Share of unconsolidated joint ventures' derivative instruments		5,930				7,888			Equity in net income from unconsolidated joint ventures	556				1,260		Equity in net income from unconsolidated joint ventures	—		5
			$	5,465			$	8,069			$	1,828			$	1,730		$	1	$	5
	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 income for the six months ended June 30, 2014 and 2013, respectively (in thousands):
			Amount of Gain or (Loss)							Location of Gain or (Loss) Reclassified from Accumulated Other Comprehensive Income into Income	Amount of Loss						Location of Gain (Loss) Recognized in Income on Derivative	Amount of Gain
			Recognized in								Reclassified from							Recognized
			Other Comprehensive								Accumulated Other							into Income
			Loss								Comprehensive Loss  into Income							(Ineffective Portion)
			(Effective Portion)								(Effective Portion)
			Six Months Ended								Six Months Ended							Six Months Ended
			June 30,								June 30,							June 30,
	Derivative		2014				2013				2014				2013			2014		2013
	Interest Rate Swaps/Caps		$	(516	)		$	140		Interest expense	$	1,964			$	938	Interest expense	$	2	$	—
	Share of unconsolidated joint ventures' derivative instruments		4,184				8,109			Equity in net income from unconsolidated joint ventures	1,829				2,500		Equity in net income from unconsolidated joint ventures	—		5
			$	3,668			$	8,249			$	3,793			$	3,438		$	2	$	5

Commitments_and_Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2014
Commitments and Contingencies Disclosure [Abstract]	'
Commitments and Contingencies	'
	Commitments and Contingencies
	Legal Proceedings
	We and the Operating Partnership are not presently involved in any material litigation nor, to our knowledge, is any material litigation threatened against us or our properties, other than routine litigation arising in the ordinary course of business. Management believes the costs, if any, incurred by us related to this litigation will not materially affect our financial position, operating results or liquidity.
	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 noncancellable operating leases with initial terms in excess of one year as of June 30, 2014 (in thousands):
		Capital lease			Non-cancellable
					operating leases
	Remaining 2014	$	73		$	15,351
	2015	145			30,703
	2016	170			30,824
	2017	291			31,057
	2018	291			31,057
	Thereafter	56,884			766,187
	Total minimum lease payments	57,854			$	905,179
	Less amount representing interest	(37,219		)
	Capitalized lease obligations	$	20,635

Segment_Information

Segment Information	6 Months Ended
	Jun. 30, 2014
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, 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.
	Our real estate portfolio is primarily located in the geographical markets of the New York Metropolitan area. The primary sources of revenue are generated from tenant rents, escalations and reimbursement revenue. Real estate property operating expenses consist primarily of security, maintenance, utility costs, real estate taxes and ground rent expense (at certain applicable properties). See Note 5, "Debt and Preferred Equity Investments," for additional details on our debt and preferred equity investments.
	Selected results of operations for the three and six months ended June 30, 2014 and 2013, and selected asset information as of June 30, 2014 and December 31, 2013, regarding our operating segments are as follows (in thousands):
		Real			Debt and Preferred			Total
		Estate			Equity			Company
		Segment			Segment
	Total revenues
	Three months ended:
	30-Jun-14	$	347,513		$	39,714		$	387,227
	30-Jun-13	307,213			46,731			353,944
	Six months ended:
	30-Jun-14	$	668,998		$	93,798		$	762,796
	30-Jun-13	608,126			99,439			707,565
	Income (loss) from continuing operations before equity in net gain on sale of interest in unconsolidated joint venture/real estate
	Three months ended:
	30-Jun-14	$	24,318		$	34,000		$	58,318
	30-Jun-13	(4,742		)	38,040			33,298
	Six months ended:
	30-Jun-14	$	26,918		$	79,582		$	106,500
	30-Jun-13	(23,548		)	81,389			57,841
	Total assets
	As of:
	30-Jun-14	$	15,155,384		$	1,562,352		$	16,717,736
	31-Dec-13	13,641,727			1,317,274			14,959,001
	Income from continuing operations represents total revenues less total expenses for the real estate segment and total investment income less allocated interest expense for the debt and preferred equity segment. Interest costs for the debt and preferred equity segment are imputed assuming 100% leverage at our MRA facility and 2012 credit facility borrowing cost. We also allocate loan loss reserves, net of recoveries, and transaction related costs to the debt and preferred equity segment. We do not allocate marketing, general and administrative expenses (totaling $23.9 million, $47.1 million, $21.5 million and $42.6 million for the three and six months ended June 30, 2014 and 2013, 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 and six months ended June 30, 2014 and 2013 (in thousands):
		Three Months Ended June 30,						Six Months Ended June 30,
		2014			2013			2014		2013
	Income from continuing operations before purchase price fair value adjustment and equity in net gain (loss) on sale of interest in unconsolidated joint venture/real estate	$	58,318		$	33,298		$	106,500	$	57,841
	Purchase price fair value adjustment	71,446			(2,305		)	71,446		(2,305		)
	Equity in net gain (loss) on sale of interest in unconsolidated joint venture/real estate	1,444			(3,583		)	106,084		(3,583		)
	Income from continuing operations	131,208			27,410			284,030		51,953
	Net income from discontinued operations	4,389			3,838			8,178		8,519
	Gain on sale of discontinued operations	114,735			—			114,735		1,113
	Net income	$	250,332		$	31,248		$	406,943	$	61,585

Significant_Accounting_Policie1

Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2014
Accounting Policies [Abstract]	'
Principles of Consolidation	'
	Principles of Consolidation
	The consolidated financial statements include our accounts and those of our subsidiaries, which are wholly-owned or controlled by us. Entities which we do not control through our voting interest and entities which are variable interest entities, but where we are not the primary beneficiary, are accounted for under the equity method or as debt and preferred equity investments. See Note 5, "Debt and Preferred Equity Investments" and Note 6, "Investments in Unconsolidated Joint Ventures." All significant intercompany balances and transactions have been eliminated.
	We consolidate a variable interest entity, or VIE, in which we are considered the primary beneficiary. The primary beneficiary is the entity that has (i) the power to direct the activities that most significantly impact the entity's economic performance and (ii) the obligation to absorb losses of the VIE or the right to receive benefits from the VIE that could be significant to the VIE. Included in commercial real estate properties on our consolidated balance sheets as of June 30, 2014 and December 31, 2013 are $609.4 million and $605.9 million, respectively, related to our consolidated VIEs. Included in mortgages and other loans payable on our consolidated balance sheets as of June 30, 2014 and December 31, 2013 are $365.8 million and $370.9 million, respectively, related to our consolidated VIEs.
	A noncontrolling interest in a consolidated subsidiary is defined as the portion of the equity (net assets) in a subsidiary not attributable, directly or indirectly, to us. Noncontrolling interests are required to be presented as a separate component of equity in the consolidated balance sheet and the presentation of net income was modified to present earnings and other comprehensive income attributed to controlling and noncontrolling interests.
	We assess the accounting treatment for each joint venture and debt and preferred equity investment. This assessment includes a review of each joint venture or limited liability company agreement to determine which party has what rights and whether those rights are protective or participating. For all VIEs, we review such agreements in order to determine which party has the power to direct the activities that most significantly impact the entity's economic performance. In situations where we and our partner approve, among other things, the annual budget, receive a detailed monthly reporting package from us, meet on a quarterly basis to review the results of the joint venture, review and approve the joint venture's tax return before filing, and approve all leases that cover more than a nominal amount of space relative to the total rentable space at each property, we do not consolidate the joint venture as we consider these to be substantive participation rights that result in shared power of the activities that most significantly impact the performance of our joint venture. Our joint venture agreements typically contain certain protective rights such as the requirement of partner approval to sell, finance or refinance the property and the payment of capital expenditures and operating expenditures outside of the approved budget or operating plan.
Investment in Commercial Real Estate Properties	'
	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 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 their carrying value or fair value less costs to sell. We do not believe that the values of any of our consolidated properties or properties held for sale were impaired at June 30, 2014.
	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
	See Note 17, "Fair Value Measurements."
Investment in Marketable Securities	'
	Investment in Marketable Securities
	We invest in marketable securities. At the time of purchase, we are required to designate a security as held-to-maturity, available-for-sale, or trading depending on ability and intent. We do not have any securities designated as held-to-maturity or trading at this time. Securities available-for-sale are reported at fair value pursuant to ASC 820-10, with the net unrealized gains or losses reported as a component of accumulated other comprehensive income or loss. 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.
Investment in Unconsolidated Joint Ventures	'
	Investments in Unconsolidated Joint Ventures
	We assess our investments in unconsolidated joint ventures for recoverability, and if it is determined that a loss in value of the investment is other than temporary, we write down the investment to its fair value. We evaluate our equity investments for impairment based on the joint venture's projected discounted cash flows. We do not believe that the values of any of our equity investments were impaired at June 30, 2014.
	We may originate loans for real estate acquisition, development and construction, or ADC arrangements, where we expect to receive some or all of the residual profit. When the risk and rewards of these ADC arrangements are essentially the same as an investor or joint venture partner, we account for these ADC arrangements as real estate investments under the equity method of accounting for investments. Otherwise, we account for these ADC arrangements consistent with our loan accounting for our debt and preferred equity investments.
Revenue Recognition	'
	Revenue Recognition
	Rental revenue is recognized on a straight-line basis over the term of the lease. Rental revenue recognition commences when the tenant takes possession or controls the physical use of the leased space. In order for the tenant to take possession, the leased space must be substantially ready for its intended use. To determine whether the leased space is substantially ready for its intended use, management evaluates whether we are or the tenant is the owner of tenant improvements for accounting purposes. When management concludes that we are the owner of tenant improvements, rental revenue recognition begins when the tenant takes possession of the finished space, which is when such tenant improvements are substantially complete. In certain instances, when management concludes that we are not the owner (the tenant is the owner) of tenant improvements, rental revenue recognition begins when the tenant takes possession of or controls the space. When management concludes that we are the owner of tenant improvements for accounting purposes, we record amounts funded to construct the tenant improvements as a capital asset. For these tenant improvements, we record amounts reimbursed by tenants as a reduction of the capital asset. When management concludes that the tenant is the owner of tenant improvements for accounting purposes, we record our contribution towards those improvements as a lease incentive, which is included in deferred costs, net on our consolidated balance sheets and amortized as a reduction to rental revenue on a straight-line basis over the term of the lease. The excess of rents recognized over amounts contractually due pursuant to the underlying leases are included in deferred rents receivable on the consolidated balance sheets. We establish, on a current basis, an allowance for future potential tenant credit losses, which may occur against this account. The balance reflected on the consolidated balance sheets is net of such allowance.
	In addition to base rent, our tenants also generally will pay their pro rata share of increases in real estate taxes and operating expenses for the building over a base year. In some leases, in lieu of paying additional rent based upon increases in building operating expenses, the tenant will pay additional rent based upon increases in the wage rate paid to porters over the porters' wage rate in effect during a base year or increases in the consumer price index over the index value in effect during a base year. In addition, many of our leases contain fixed percentage increases over the base rent to cover escalations. Electricity is most often supplied by the landlord either on a sub-metered basis, or rent inclusion basis (i.e., a fixed fee is included in the rent for electricity, which amount may increase based upon increases in electricity rates or increases in electrical usage by the tenant). Base building services other than electricity (such as heat, air conditioning and freight elevator service during business hours, and base building cleaning) are typically provided at no additional cost, with the tenant paying additional rent only for services which exceed base building services or for services which are provided outside normal business hours. These escalations are based on actual expenses incurred in the prior calendar year. If the expenses in the current year are different from those in the prior year, then during the current year, the escalations will be adjusted to reflect the actual expenses for the current year.
	We record a gain on sale of real estate when title is conveyed to the buyer, subject to the buyer's financial commitment being sufficient to provide economic substance to the sale and we have no substantial economic involvement with the buyer.
	Interest income on debt and preferred equity investments is accrued based on the outstanding principal amount and contractual terms of the instruments and when, in the opinion of management, it is deemed collectible. Several of the debt and preferred equity investments provide for accrual of interest at specified rates, which differ from current payment terms. Interest is recognized on such loans at the accrual rate subject to management's determination that accrued interest are ultimately collectible, based on the underlying collateral and operations of the borrower. If management cannot make this determination, interest income above the current pay rate is recognized only upon actual receipt.
	Deferred originations fees and loan origination costs, if any, are recognized as a reduction to the interest income over the terms of the related investments using the effective interest method. Fees received in connection with loan commitments are also deferred until the loan is funded and are then recognized over the term of the loan as an adjustment to yield. Discounts or premiums associated with the purchase of loans are amortized or accreted into interest income as a yield adjustment on the effective interest method based on expected cashflows through the expected maturity date of the related investment. If we purchase a debt or preferred equity investment at a discount, intend to hold it until maturity and expect to recover the full value of the investment, we accrete the discount into income as an adjustment to yield over the term of the investment. If we purchase a debt or preferred equity investment at a discount with the intention of foreclosing on the collateral, we do not accrete the discount. Anticipated exit fees, whose collection is expected, are also recognized over the term of the loan as an adjustment to yield.
	Debt and preferred equity investments are placed on a non-accrual status at the earlier of the date at which payments become 90 days past due or when, in the opinion of management, a full recovery of interest income becomes doubtful. Interest income recognition on any non-accrual debt or preferred equity investment is resumed when such non-accrual debt or preferred equity investment becomes contractually current and performance is demonstrated to be resumed. Interest is recorded as income on impaired loans only to the extent cash is received.
	We may syndicate a portion of the loans that we originate or sell these loans individually. When a transaction meets the criteria of sale accounting, we derecognize the loan sold and recognize gain or loss based on the difference between the sales price and the carrying value of the loan sold. Any related unamortized deferred origination fees, loan origination costs, discounts or premiums at the time of sale are recognized as an adjustment to the gain or loss on sale, which is included in investment income on the consolidated statement of income. Any fees received at the time of sale or syndication are recognized as part of investment income.
Reserve for Possible Credit Losses	'
	Reserve for Possible Credit Losses
	The expense for possible credit losses in connection with debt and preferred equity investments is the charge to earnings to increase the allowance for possible credit losses to the level that we estimate to be adequate, based on Level 3 data, considering delinquencies, loss experience and collateral quality. Other factors considered relate to geographic trends and product diversification, the size of the portfolio and current economic conditions. Based upon these factors, we establish the provision for possible credit losses on each individual investment. When it is probable that we will be unable to collect all amounts contractually due, the investment is considered impaired.
	Where impairment is indicated on an investment that is held to maturity, a valuation allowance is measured based upon the excess of the recorded investment amount over the net fair value of the collateral. Any deficiency between the carrying amount of an asset and the calculated value of the collateral is charged to expense. We continue to assess or adjust our estimates based on circumstances of a loan and the underlying collateral. If the additional information obtained reflects increased recovery of our investment, we will adjust our reserves accordingly. There were no loan reserves recorded during each of the three and six months ended June 30, 2014 and 2013.
	Debt and preferred equity investments held for sale are carried at the lower of cost or fair market value using available market information obtained through consultation with dealers or other originators of such investments as well as discounted cash flow models based on Level 3 data pursuant to ASC 820-10. As circumstances change, management may conclude not to sell an investment designated as held for sale. In such situations, the investment will be reclassified at its net carrying value to debt and preferred equity investments held to maturity. For these reclassified investments, the difference between the current carrying value and the expected cash to be collected at maturity will be accreted into income over the remaining term of the investment.
Income Taxes	'
	Income Taxes
	SL Green is taxed as a REIT under Section 856(c) of the Code. As a REIT, SL Green generally is not subject to Federal income tax. To maintain its qualification as a REIT, SL Green must distribute at least 90% of its REIT taxable income to its stockholders and meet certain other requirements. If SL Green fails to qualify as a REIT in any taxable year, we will be subject to Federal income tax on SL Green's taxable income at regular corporate rates. SL Green may also be subject to certain state, local and franchise taxes. Under certain circumstances, Federal income and excise taxes may be due on SL Green's undistributed taxable income.
	The Operating Partnership is a partnership and, as a result, all income and losses of the partnership are allocated to the partners for inclusion in their respective income tax returns. The only provision for income taxes included in the consolidated statements of income 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, a TRS may perform non-customary services for the tenants of the Company, hold assets that we cannot hold directly and generally may engage in any real estate or non-real estate related business. The TRSs generate income, resulting in Federal and state income tax liability for these entities.
	During the three and six months ended June 30, 2014 and 2013, we recorded a Federal, state and local tax provision of $2.1 million, $5.0 million, $2.3 million and $3.9 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 ratably 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 performance measures, the total estimated compensation cost is based on the fair value of the award at the applicable reporting date estimated using a binomial model. 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 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 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.
Concentration 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 primarily 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 Northern New Jersey.
Reclassification	'
	Reclassification
	Certain prior year balances have been reclassified to conform to our current year presentation primarily in order to eliminate discontinued operations from income from continuing operations. In April 2014, we reclassified one of our debt and preferred equity investments to investments in unconsolidated joint ventures as a result of meeting the criteria of a real estate investment under the accounting guidance for ADC arrangements.
Accounting Standards Updates	'
	Accounting Standards Updates
	In June 2014, the Financial Accounting Standards Board, or the FASB, issued final guidance that requires repurchase-to-maturity transactions to be accounted for as secured borrowings as if the transferor retains effective control, even though the transferred financial assets are not returned to the transferor at settlement and also eliminates existing guidance for repurchase financings (Accounting Standards Update, or ASU, No. 2014-11). New disclosures are required for (1) certain transactions accounted for as secured borrowings and (2) transfers accounted for as sales when the transferor also retains substantially all of the exposure to the economic return on the transferred financial assets throughout the term of the transaction. The guidance is effective for the first interim or annual period beginning after December 15, 2014, except for the disclosures related to transactions accounted for as secured borrowings, which are effective for periods beginning after March 15, 2015. Early adoption of this guidance is prohibited. The Company will adopt this standard beginning in the first quarter of 2015. The adoption of this guidance is not anticipated to have a material impact on our consolidated financial statements.
	In May 2014, the FASB issued a new comprehensive revenue recognition guidance which requires us to recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which we expect to be entitled in exchange for those goods and services (ASU No. 2014-09). The guidance also requires enhanced disclosures to help users of financial statements better understand the nature, amount, timing, and uncertainty of revenue that is recognized. The guidance is effective for annual and interim periods beginning after December 15, 2016 and early adoption is not permitted. The new guidance can be applied either retrospectively to each prior reporting period presented, or as a cumulative-effect adjustment as of the date of adoption. The Company is currently evaluating the new guidance to determine the impact it may have on our consolidated financial statements.
	In April 2014, the FASB issued new guidance on reporting discontinued operations which raises the threshold for disposals to qualify as discontinued operations (ASU No. 2014-08). The guidance also allows us to have a significant continuing involvement and continuing cash flows with the discontinued operations. Additionally, the guidance requires additional disclosures for discontinued operations and new disclosures for individually material disposal transactions that do not meet the definition of a discontinued operation. The guidance is effective for calendar year public companies beginning in the first quarter of 2015 and is to be applied on a prospective basis for new disposals. Early adoption of this guidance is permitted. The Company will adopt this standard beginning in the first quarter of 2015. The adoption of this guidance will change the presentation of discontinued operations but will not have a material impact on our consolidated financial statements.

Organization_and_Basis_of_Pres1

Organization and Basis of Presentation (Tables)	6 Months Ended
	Jun. 30, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'
Schedule of commercial office properties	'
	As of June 30, 2014, we owned the following interests in properties in the New York Metropolitan area, primarily in midtown Manhattan, a borough of New York City. Our investments in the New York Metropolitan area also include investments in Brooklyn, Long Island, Westchester County, Connecticut and Northern New Jersey, which are collectively known as the Suburban properties:
				Consolidated			Unconsolidated		Total
	Location		Type	Number of Properties		Square Feet	Number of Properties	Square Feet	Number of Properties	Square Feet	Weighted Average Occupancy(1)
	Commercial:
	Manhattan		Office	23		18,429,045	7	3,476,115	30	21,905,160	94.4	%
			Retail	7	-2	389,317	8	432,250	15	821,567	93.2	%
			Development/Redevelopment	11		2,063,790	4	1,605,782	15	3,669,572	44.2	%
			Fee Interest	2		961,400	—	—	2	961,400	100	%
				43		21,843,552	19	5,514,147	62	27,357,699	87.8	%
	Suburban		Office	27		4,365,400	4	1,222,100	31	5,587,500	81.7	%
			Retail	1		52,000	—	—	1	52,000	100	%
			Development/Redevelopment	1		85,000	1	65,641	2	150,641	42.7	%
				29		4,502,400	5	1,287,741	34	5,790,141	80.9	%
	Total commercial properties			72		26,345,952	24	6,801,888	96	33,147,840	86.6	%
	Residential:
	Manhattan		Residential	2	-2	653,337	—	—	2	653,337	93.2	%
	Suburban		Residential	1		66,611	—	—	1	66,611	84.4	%
	Total residential properties			3		719,948	—	—	3	719,948	91.9	%
	Total portfolio			75		27,065,900	24	6,801,888	99	33,867,788	86.7	%
	______________________________________________________________________
	-1	The weighted average occupancy for commercial properties represents the total occupied square feet divided by total available rentable square feet.  The weighted average occupancy for residential properties represents the total occupied units divided by total available units.
	-2	As of June 30, 2014, we owned a building that was comprised of 270,132 square feet of retail space and 222,855 square feet of residential space. For the purpose of this report, we have included the building as part of retail properties and have shown the square footage under its respective classifications.

Significant_Accounting_Policie2

Significant Accounting Policies (Tables)	6 Months Ended
	Jun. 30, 2014
Accounting Policies [Abstract]	'
Summary of identified intangible assets (acquired above-market leases and in-place leases) and intangible liabilities (acquired below-market leases)	'
	The following summarizes our identified intangible assets (acquired above-market leases and in-place leases) and intangible liabilities (acquired below-market leases) as of June 30, 2014 and December 31, 2013 (in thousands):
		30-Jun-14			December 31, 2013
	Identified intangible assets (included in other assets):
	Gross amount	$	702,189		$	746,704
	Accumulated amortization	(382,231		)	(343,339		)
	Net	$	319,958		$	403,365
	Identified intangible liabilities (included in deferred revenue):
	Gross amount	$	676,075		$	671,380
	Accumulated amortization	(461,952		)	(429,138		)
	Net	$	214,123		$	242,242
Schedule of marketable securities	'
	At June 30, 2014 and December 31, 2013, we held the following marketable securities (in thousands):
		30-Jun-14			December 31, 2013
	Equity marketable securities	$	4,532		$	4,307
	Commercial mortgage-backed securities	35,380			24,419
	Rake bonds	—			3,323
	Total marketable securities available-for-sale	$	39,912		$	32,049

Property_Acquisitions_Tables

Property Acquisitions (Tables)	6 Months Ended
	Jun. 30, 2014
Business Combinations [Abstract]	'
Schedule of Pro Forma Information	'
	The following table summarizes, on an unaudited pro forma basis, the results of operations of 388-390 Greenwich Street, which are included in the consolidated statement of income, and our consolidated results of operations for the three and six months ended June 30, 2014 and 2013 as though the acquisition of our joint venture partner's interest in 388-390 Greenwich Street was completed on January 1, 2013. The supplemental pro forma data is not necessarily indicative of what the actual results of operations would have been assuming the transactions had been completed as set forth above, nor do they purport to represent our results of operations for future periods.
			Three Months Ended June 30,			Six Months Ended June 30,
	(In thousands, except per share amounts)		2014		2013	2014		2013
	Actual revenues since acquisition		$	14,897		$	14,897
	Actual net income since acquisition		76,844			76,844
	Pro forma revenues		400,812		381,397	804,863		762,471
	Pro forma income from continuing operations		61,930		27,437	218,835		127,081
	Pro forma basic earnings per share		1.77		0.09	3.34		1.09
	Pro forma diluted earnings per share		1.76		0.09	3.33		1.09
	Pro forma basic earnings per unit		1.77		0.09	3.34		1.09
	Pro forma diluted earnings per unit		1.76		0.09	3.33		1.09
	______________________________________________________________________
	-1	The pro forma income from continuing operations for the three and six months ended June 30, 2014 and 2013 includes the effect of the new financing necessary to complete the acquisition and the preliminary allocation of purchase price in connection with the changes in depreciation and amortization. In addition, the pro forma income from continuing operations for the six months ended June 30, 2013 was adjusted to include the purchase price fair value adjustment, as though the acquisition was completed on January 1, 2013. The pro forma income from continuing operations for the three and six months ended June 30, 2014 excludes this purchase price fair value adjustment.

Properties_Held_for_Sale_and_D1

Properties Held for Sale and Dispositions (Tables)	6 Months Ended
	Jun. 30, 2014
Discontinued Operations and Disposal Groups [Abstract]	'
Summary of income from discontinued operations	'
	The following table summarizes net income from discontinued operations for the three and six months ended June 30, 2014 and 2013, respectively (in thousands):
		Three Months Ended June 30,				Six Months Ended June 30,
		2014		2013		2014		2013
	Revenues
	Rental revenue	$	8,366	$	15,494	$	19,000	$	30,155
	Escalation and reimbursement revenues	258		789		1,080		1,985
	Other income	2		2		2		485
	Total revenues	8,626		16,285		20,082		32,625
	Operating expenses	291		2,362		1,179		4,832
	Real estate taxes	383		1,245		1,402		2,489
	Ground rent	805		719		3,001		3,582
	Interest expense, net of interest income	2,707		3,892		5,827		6,918
	Amortization of deferred financing costs	11		11		22		22
	Depreciable real estate reserves	—		2,150		—		2,150
	Depreciation and amortization	—		2,060		433		4,126
	Transaction related costs, net of recoveries	40		8		40		(13		)
	Total expenses	4,237		12,447		11,904		24,106
	Net income from discontinued operations	$	4,389	$	3,838	$	8,178	$	8,519

Debt_and_Preferred_Equity_Inve1

Debt and Preferred Equity Investments (Tables)	6 Months Ended
	Jun. 30, 2014
Investments, Debt and Equity Securities [Abstract]	'
Summary of debt investments	'
	As of June 30, 2014 and December 31, 2013, we held the following debt investments with an aggregate weighted average current yield of 10.69% at June 30, 2014 (in thousands):
	Loan Type		30-Jun-14			30-Jun-14		June 30, 2014 Carrying Value(1)		December 31, 2013 Carrying Value(1)			Initial
			Funding Obligations			Senior Financing							Maturity
													Date
	Fixed Rate Investments:
	Jr. Mortgage Participation		$	—		$	398,500	$	11,893	$	11,856		Mar-15
	Jr. Mortgage Participation/Mezzanine Loan		—			205,000		69,480		68,319			Feb-16
	Jr. Mortgage Participation/Mezzanine Loan		—			165,159		45,137		44,742			May-16
	Mezzanine Loan		—			177,000		14,519		15,012			May-16
	Jr. Mortgage Participation		—			133,000		49,000		49,000			Jun-16
	Mezzanine Loan		—			165,000		71,430		71,312			Nov-16
	Jr. Mortgage Participation/Mezzanine Loan(2)		—			1,109,000		95,329		26,884			Mar-17
	Other(2)		—			—		65,578		54,099			Mar-17
	Mezzanine Loan(3)		19,725			521,750		21,267		20,954			Jun-17
	Mortgage Loan		—			—		696		—			Aug-19
	Mezzanine Loan		—			15,000		3,500		3,500			Sep-21
	Mezzanine Loan(4)		—			90,000		19,928		19,926			Nov-23
	Total fixed rate		$	19,725		$	2,979,409	$	467,757	$	385,604
	Floating Rate Investments:
	Jr. Mortgage Participation/Mezzanine Loan(5)		—			330,000		131,987		131,724			Jul-14
	Mezzanine Loan(6)		—			180,000		59,974		59,892			Aug-14
	Jr. Mortgage Participation(7)		—			57,750		10,875		10,873			Aug-14
	Mezzanine Loan(8)		—			481,309		19,487		—			Sep-14
	Mezzanine Loan		9,794			93,279		40,125		38,549			Oct-14
	Jr. Mortgage Participation(9)		—			84,000		24,959		24,046			Feb-15
	Mezzanine Loan		22,817			50,000		22,002		—			Apr-15
	Mortgage/Mezzanine Loan		—			—		108,981		—			Jun-15
	Mezzanine Loan		—			110,000		49,354		49,110			Sep-15
	Mezzanine Loan		9,215			107,157		40,662		27,662			Dec-15
	Mezzanine Loan		—			775,000		73,326		72,823			Mar-16
	Mezzanine Loan(10)		—			160,000		22,549		22,526			Jun-16
	Mezzanine Loan		—			115,000		24,907		25,590			Jul-16
	Mezzanine Loan		10,584			168,485		26,655		25,725			Nov-16
	Mezzanine Loan		333			33,833		11,816		11,798			Dec-16
	Jr. Mortgage Participation/Mezzanine Loan		—			55,000		20,544		20,553			Jul-18
	Mortgage/Mezzanine Loan		—			—		17,923		—			Feb-19
	Mezzanine Loan		—			38,000		21,789		—			Mar-19
	Mortgage Loan(11)		—			—		—		30,000
	Total floating rate		$	52,743		$	2,838,813	$	727,915	$	550,871
	Total		$	72,468		$	5,818,222	1,195,672		936,475
	Loan loss reserve							—		(1,000		)
	Total							$	1,195,672	$	935,475
	______________________________________________________________________
	-1	Carrying value is net of discounts, original issue discounts and deferred origination fees.
	-2	During the three months ended March 31, 2014, we recognized $10.1 million of previously unaccrued interest income as deemed collectible as a result of the subsequent sale of the property, which closed in June 2014. In connection with the sale of the underlying property, our existing $66.7 million mezzanine loan was defeased and is now shown separately, as it is collateralized by defeasance securities. The buyer assumed our $30.0 million participating interest on the mortgage and we acquired a $67.3 million participating interest on the mezzanine loan.
	-3	Carrying value is net of $41.3 million that was participated out, which is included in other assets and other liabilities on the consolidated balance sheets as a result of the transfer not meeting the conditions for sale accounting.
	-4	Carrying value is net of $5.0 million that was participated out, which is included in other assets and other liabilities on the consolidated balance sheets as a result of the transfer not meeting the conditions for sale accounting.
	-5	This loan was repaid in July 2014.
	-6	This loan was repaid in August 2014.
	-7	In June 2014, the loan maturity date was extended to August 2014 and $10.8 million has been repaid.
	-8	This loan was previously included in other assets on the consolidated balance sheets. Following the sale of our interest in the partnership that is the borrower, the loan was reclassified to debt and preferred equity investments.
	-9	In March 2014, the loan was extended to February 2015.
	-10	Carrying value is net of $7.4 million that was participated out, which is included in other assets and other liabilities on the consolidated balance sheets as a result of the transfer not meeting the conditions for sale accounting.
	-11	This loan was repaid in May 2014.
Summary of preferred equity investments	'
	As of June 30, 2014 and December 31, 2013, we held the following preferred equity investments with an aggregate weighted average current yield of 9.75% at June 30, 2014 (in thousands):
	Type		June 30, 2014			June 30, 2014		December 31, 2013		Initial
			Senior Financing			Carrying Value (1)		Carrying Value (1)		Mandatory
										Redemption
	Preferred equity(2)		$	525,000		$	119,197	$	115,198	Jul-15
	Preferred equity(2)		926,260			222,992		218,330		Jul-16
	Preferred equity		70,000			9,947		9,940		Nov-17
	Preferred equity(3)		—			—		25,896
			$	1,521,260		$	352,136	$	369,364
	______________________________________________________________________
	-1	Carrying value is net of discounts and deferred origination fees.
	-2	The difference between the pay and accrual rates is included as an addition to the principal balance outstanding.
	-3	This preferred equity investment was redeemed in April 2014.
Rollforward of total allowance for loan loss reserves	'
	The following table is a rollforward of our total loan loss reserves at June 30, 2014 and December 31, 2013 (in thousands):
		June 30, 2014			December 31, 2013
	Balance at beginning of year	$	1,000		$	7,000
	Expensed	—			—
	Recoveries	—			—
	Charge-offs and reclassifications	(1,000		)	(6,000		)
	Balance at end of period	$	—		$	1,000

Investment_in_Unconsolidated_J1

Investment in Unconsolidated Joint Ventures (Tables)	6 Months Ended
	Jun. 30, 2014
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 June 30, 2014 (amounts in thousands):
	Property	Partner		Ownership	Economic		Square			Acquisition Date		Acquisition
				Interest	Interest		Feet					Price(1)
	100 Park Avenue	Prudential		49.90%	49.90%		834			Jan-00		$	95,800
	717 Fifth Avenue	Sutton/Private Investor		10.92%	10.92%		120			Sep-06		251,900
	800 Third Avenue	Private Investors		42.95%	42.95%		526			Dec-06		285,000
	1745 Broadway	Witkoff/SITQ/Lehman Bros.		32.26%	32.26%		674			Apr-07		520,000
	1 and 2 Jericho Plaza	Onyx/Credit Suisse		20.26%	20.26%		640			Apr-07		210,000
	The Meadows	Onyx		50.00%	50.00%		582			Sep-07		111,500
	180/182 Broadway(2)	Harel/Sutton		25.50%	25.50%		71			Feb-08		43,600
	600 Lexington Avenue	CPPIB		55.00%	55.00%		304			May-10		193,000
	11 West 34th Street	Private Investor/Sutton		30.00%	30.00%		17			Dec-10		10,800
	7 Renaissance	Cappelli		50.00%	50.00%		37			Dec-10		4,000
	3 Columbus Circle(3)	Moinian		48.90%	48.90%		769			Jan-11		500,000
	280 Park Avenue	Vornado		50.00%	49.50%		1,237			Mar-11		400,000
	1552-1560 Broadway(4)	Sutton		50.00%	50.00%		49			Aug-11		136,550
	724 Fifth Avenue	Sutton		50.00%	50.00%		65			Jan-12		223,000
	10 East 53rd Street	CPPIB		55.00%	55.00%		390			Feb-12		252,500
	33 Beekman(5)	Harel/Naftali		45.90%	45.90%		145			Aug-12		31,000
	521 Fifth Avenue	Plaza		50.50%	50.50%		460			Nov-12		315,000
	21 East 66th Street(6)	Private Investors		32.28%	32.28%		17			Dec-12		75,000
	315 West 36th Street	Private Investors		35.50%	35.50%		148			Dec-12		45,000
	650 Fifth Avenue(7)	Sutton		50.00%	50.00%		32			Nov-13		—
	______________________________________________________________________
	-1	Acquisition price represents the actual or implied gross purchase price for the joint venture.
	-2	In June 2014, the joint venture entered into a contract to sell the property for $222.5 million. This transaction is expected to close during the third quarter of 2014, subject to satisfaction of customary closing conditions.
	-3	As a result of the sale of a condominium interest in September 2012, Young & Rubicam, Inc., or Y&R, owns a portion of the property, generally floors three through eight referred to as Y&R units. Because the joint venture has an option to repurchase the Y&R units, the gain associated with this sale was deferred.
	-4	The purchase price pertained only to the purchase of the 1552 Broadway interest which comprised 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 joint venture owns a fee interest in the property and will develop an approximately 30 story building for student housing. Upon completion of the development, the joint venture will convey a long-term ground lease condominium interest in the building to Pace.
	-6	We hold a 32.28% interest in three retail and two residential units at the property and a 16.14% interest in four 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 Sutton 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.
Schedule of first mortgage notes payable collateralized by the respective joint venture properties and assignment of leases	'
	The first mortgage notes and other loans payable collateralized by the respective joint venture properties and assignment of leases at June 30, 2014 and December 31, 2013, respectively, are as follows (amounts in thousands):
	Property		Maturity Date		Interest			30-Jun-14				31-Dec-13
					Rate(1)
	Fixed Rate Debt:
	7 Renaissance		Dec-15		10	%		$	1,461			$	1,276
	11 West 34th Street		Jan-16		4.82	%		17,056				17,205
	280 Park Avenue		Jun-16		6.57	%		703,520				706,886
	1745 Broadway		Jan-17		5.68	%		340,000				340,000
	1 and 2 Jericho Plaza		May-17		5.65	%		163,750				163,750
	800 Third Avenue		Aug-17		6	%		20,910				20,910
	315 West 36th Street		Dec-17		3.16	%		25,000				25,000
	717 Fifth Avenue(2)		Jul-22		4.45	%		300,000				300,000
	21 East 66th Street		Apr-23		3.6	%		12,000				12,000
	717 Fifth Avenue(2)		Jul-24		9	%		309,074				304,000
	388 and 390 Greenwich Street(3)		—		—			—				996,082
	100 Park Avenue(4)		—		—			—				209,786
	21 West 34th Street(5)		—		—			—				100,000
	1604-1610 Broadway(6)		—		—			—				27,000
	Total fixed rate debt							$	1,892,771			$	3,223,895
	Floating Rate Debt:
	180/182 Broadway		Dec-14		2.91	%		89,551				89,893
	The Meadows		Sep-15		7.75	%		67,350				67,350
	3 Columbus Circle(7)		Apr-16		2.33	%		235,129				239,233
	1552 Broadway(8)		Apr-16		4.16	%		175,904				158,690
	Other loan payable		Jun-16		1.06	%		30,000				30,000
	10 East 53rd Street		Feb-17		2.66	%		125,000				125,000
	724 Fifth Avenue(9)		Apr-17		2.58	%		275,000				120,000
	33 Beekman(10)		Aug-17		2.91	%		34,141				18,362
	600 Lexington Avenue		Oct-17		2.23	%		118,689				120,616
	521 Fifth Avenue		Nov-19		2.36	%		170,000				170,000
	100 Park Avenue(4)		Feb-21		1.91	%		360,000				—
	21 East 66th Street		Jun-33		2.88	%		1,921				1,959
	388 and 390 Greenwich Street(3)		—		—			—				142,297
	747 Madison Avenue		—		—			—				33,125
	West Coast Office portfolio(11)		—		—			—				526,290
	Total floating rate debt							$	1,682,685			$	1,842,815
	Total joint venture mortgages and other loans payable							$	3,575,456			$	5,066,710
	_________________________________
	-1	Effective weighted average interest rate for the three months ended June 30, 2014, 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	In May 2014, we acquired the interest of our joint venture thereby consolidating the entity. Simultaneous with the acquisition, we refinanced the mortgage and realized a net loss on early extinguishment of debt of $2.4 million.
	-4	In February 2014, the joint venture replaced the previous fixed rate mortgage with a $360.0 million, seven-year floating rate, mortgage and realized a net loss on early extinguishment of $3.2 million.
	-5	In January 2014, we sold our interest in the joint venture, inclusive of our share of the joint venture debt.
	-6	This loan was in default since November 2009 due to the non-payment of debt service. In January 2014, the joint venture relinquished its ground lease position to the lender. During the six months ended June 30, 2014, we also recognized $7.7 million of incentive income, which is included in other income on the consolidated statements of income.
	-7	The joint venture has the ability to increase the mortgage by $40.0 million based on meeting certain performance hurdles. In connection with this obligation, we executed a master lease agreement and our joint venture partner executed a contribution agreement to reflect its pro rata obligation under the master lease. The lien on the mortgage and the master lease excludes the condominium interest owned by Y&R. See Note 3 of prior table.
	-8	These loans are comprised of a $150.0 million mortgage loan and a $41.5 million mezzanine loan and are subject to two one-year extension options. As of June 30, 2014, $8.4 million of the mortgage loan and $7.2 million of the mezzanine loan remained unfunded.
	-9	In April 2014, the joint venture refinanced the previous mortgage with a $235.0 million mortgage and a $40.0 million mezzanine loan and realized a net loss on early extinguishment of debt of $1.2 million. These new floating rate loans mature in April 2017.
	-10	This loan has a committed amount of $75.0 million, which 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.
	-11	In March 2014, we sold our interest in the joint venture, inclusive of our share in the joint venture debt.
Schedule of combined balance sheets for the unconsolidated joint ventures	'
	The combined balance sheets for the unconsolidated joint ventures, at June 30, 2014 and December 31, 2013, are as follows (in thousands):
		30-Jun-14			December 31, 2013
	Assets
	Commercial real estate property, net	$	4,925,422		$	6,846,021
	Other assets	749,571			827,282
	Total assets	$	5,674,993		$	7,673,303
	Liabilities and members' equity
	Mortgages and other loans payable	$	3,575,456		$	5,066,710
	Other liabilities	485,753			596,960
	Members' equity	1,613,784			2,009,633
	Total liabilities and members' equity	$	5,674,993		$	7,673,303
	Company's investments in unconsolidated joint ventures	$	971,926		$	1,113,218
Schedule of combined statements of income for the unconsolidated joint ventures	'
	The combined statements of income for the unconsolidated joint ventures, from acquisition date through the three and six months ended June 30, 2014 and 2013 are as follows (in thousands):
		Three Months Ended June 30,							Six Months Ended June 30,
		2014			2013				2014				2013
	Total revenues	$	130,495		$	154,974			$	291,633			$	306,205
	Operating expenses	18,362			28,205				45,045				56,816
	Ground rent	2,632			658				4,657				1,315
	Real estate taxes	15,406			16,958				32,342				34,263
	Interest expense, net of interest income	44,728			56,561				97,064				112,968
	Amortization of deferred financing costs	2,026			5,302				6,659				9,585
	Transaction related costs, net of recoveries	(207		)	—				64				—
	Depreciation and amortization	33,858			52,539				79,462				95,150
	Total expenses	116,805			160,223				265,293				310,097
	Loss on early extinguishment of debt	(3,546		)	—				(6,743		)		—
	Net income (loss) before gain on sale	$	10,144		$	(5,249	)		$	19,597			$	(3,892	)
	Company's equity in net income (loss) from unconsolidated joint ventures	$	8,619		$	(3,761	)		$	14,748			$	1,313

Deferred_Costs_Tables

Deferred Costs (Tables)	6 Months Ended
	Jun. 30, 2014
Deferred Costs [Abstract]	'
Schedule of components of deferred costs	'
	Deferred costs at June 30, 2014 and December 31, 2013 consisted of the following (in thousands):
		30-Jun-14			December 31, 2013
	Deferred leasing	$	331,716		$	326,379
	Deferred financing	201,148			157,088
		532,864			483,467
	Less accumulated amortization	(232,821		)	(216,409		)
	Deferred costs, net	$	300,043		$	267,058

Mortgages_and_Other_Loans_Paya1

Mortgages and Other Loans Payable (Tables)	6 Months Ended
	Jun. 30, 2014
Mortgages and Other Loans Payable	'
Schedule of first mortgages and other loans payable collateralized by the respective properties and assignment of leases	'
	The first mortgages and other loans payable collateralized by the respective properties and assignment of leases at June 30, 2014 and December 31, 2013 were as follows (amounts in thousands):
	Property		Maturity	Interest		30-Jun-14		31-Dec-13
			Date	Rate(1)
	Fixed Rate Debt:
	125 Park Avenue		Oct-14	5.75	%	$	146,250	$	146,250
	711 Third Avenue		Jun-15	4.99	%	120,000		120,000
	625 Madison Avenue		Nov-15	7.27	%	117,892		120,830
	500 West Putnam Avenue		Jan-16	5.52	%	23,253		23,529
	420 Lexington Avenue		Sep-16	7.15	%	181,612		182,641
	Landmark Square		Dec-16	4	%	82,097		82,909
	485 Lexington Avenue		Feb-17	5.61	%	450,000		450,000
	120 West 45th Street		Feb-17	6.12	%	170,000		170,000
	762 Madison Avenue		Feb-17	3.75	%	8,128		8,211
	2 Herald Square(2)		Apr-17	5.36	%	191,250		191,250
	885 Third Avenue		Jul-17	6.26	%	267,650		267,650
	388-390 Greenwich Street(3)		Jun-18	3.8	%	504,000		—
	Other loan payable(4)		Sep-19	8	%	50,000		50,000
	One Madison Avenue		May-20	5.91	%	576,653		587,336
	100 Church		Jul-22	4.68	%	230,000		230,000
	919 Third Avenue(5)		Jun-23	5.12	%	500,000		500,000
	400 East 57th Street		Feb-24	4.13	%	69,503		70,000
	400 East 58th Street		Feb-24	4.13	%	29,787		30,000
	1515 Broadway		Mar-25	3.93	%	900,000		900,000
	Series J Preferred Units(6)		Apr-51	3.75	%	4,000		—
	609 Partners, LLC(7)		—	—		—		23
	Total fixed rate debt					$	4,622,075	$	4,130,629
	Floating Rate Debt:
	Master repurchase agreement(8)		Dec-14	3.37	%	—		91,000
	180 Maiden Lane(9)		Nov-16	2.34	%	258,351		262,706
	388-390 Greenwich Street(3)		Jun-18	1.91	%	946,000		—
	248-252 Bedford Avenue(10)		Jun-19	2.16	%	29,000		22,000
	220 East 42nd Street		Oct-20	1.76	%	275,000		275,000
	16 Court Street(11)		0	0		—		79,243
	Total floating rate debt					$	1,508,351	$	729,949
	Total mortgages and other loans payable					$	6,130,426	$	4,860,578
	_________________________________
	-1	Effective weighted average interest rate for the three months ended June 30, 2014, taking into account interest rate hedges in effect during the period.
	-2	This property is held for sale at June 30, 2014 and the related $191.3 million mortgage is included in liabilities related to assets held for sale.
	-3	Simultaneous with the acquisition of our joint venture partner interest, we refinanced the $1.1 billion floating rate mortgage with a $1.5 billion seven-year floating rate mortgage, and have consolidated the property.
	-4	This loan is secured by a portion of a preferred equity investment.
	-5	We own a 51.0% controlling interest in the joint venture that is the borrower on this loan.
	-6	In connection with the subsequent acquisition of a commercial real estate property, the Operating Partnership issued $4.0 million or 4,000 3.75% Series J Preferred Units of limited partnership interest, of the Series J Preferred Units, with a mandatory liquidation preference of $1,000.00 per unit. The Series J Preferred Units can be redeemed in cash by the Operating Partnership on the earlier of (i) the date of the sale of the property or (ii) April 30, 2051 or at the option of the unitholders as further prescribed in the related agreement.
	-7	In April 2014, the remaining 22,658 Series E Preferred Units of the Operating Partnership were canceled.
	-8	The Master Repurchase Agreement, or MRA, has a maximum facility capacity of $300.0 million.
	-9	In connection with this consolidated joint venture obligation, we executed a master lease agreement. Our partner has executed a contribution agreement to reflect its pro rata share of the obligation under the master lease.
	-10	In June 2014, we replaced the previous floating rate mortgage with a $29.0 million, five-year floating rate mortgage and incurred a net loss on early extinguishment of debt of $0.5 million.
	-11	In April 2014, we repaid the loan and incurred a loss on early extinguishment of debt of $0.5 million.

Corporate_Indebtedness_Tables

Corporate Indebtedness (Tables)	6 Months Ended
	Jun. 30, 2014
Debt Disclosure [Abstract]	'
Schedule of senior unsecured notes and other related disclosures by scheduled maturity date	'
	The following table sets forth our senior unsecured notes and other related disclosures as of June 30, 2014 and December 31, 2013 by scheduled maturity date (amounts in thousands):
	Issuance		June 30, 2014 Unpaid Principal Balance				June 30, 2014 Accreted Balance			December 31, 2013 Accreted Balance			Coupon			Effective			Term	Maturity Date
													Rate(1)			Rate			(in Years)
	August 13, 2004(2)		$	75,898			$	75,898		$	75,898		5.88	%		5.88	%		10	August 15, 2014
	March 31, 2006(2)		255,308				255,227			255,206			6	%		6	%		10	March 31, 2016
	October 12, 2010(3)		345,000				303,354			297,837			3	%		3	%		7	October 15, 2017
	August 5, 2011(4)		250,000				249,712			249,681			5	%		5	%		7	August 15, 2018
	March 16, 2010(4)		250,000				250,000			250,000			7.75	%		7.75	%		10	March 15, 2020
	November 15, 2012(4)		200,000				200,000			200,000			4.5	%		4.5	%		10	December 1, 2022
	June 27, 2005(2)(5)		7				7			7			4	%		4	%		20	June 15, 2025
	March 26, 2007(6)		10,008				10,008			10,701			3	%		3	%		20	March 30, 2027
			$	1,386,221			$	1,344,206		$	1,339,330
	_________________________________
	-1	Interest on the senior unsecured notes is payable semi-annually with principal and unpaid interest due on the scheduled maturity dates.
	-2	Issued by ROP.
	-3	Issued by the Operating Partnership. Interest on these exchangeable notes is payable semi-annually on April 15 and October 15. The notes had an initial exchange rate representing an exchange price that was set at a 30.0% premium to the last reported sale price of SL Green's common stock on October 6, 2010, or $85.81. The initial exchange rate is subject to adjustment under certain circumstances. The current exchange rate is 11.7153 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 guaranteed by ROP. On the issuance date, $78.3 million of the debt balance was recorded in equity. As of June 30, 2014, $41.6 million remained to be amortized into the debt balance.
	-4	Issued by the Company, the Operating Partnership and ROP, as co-obligors.
	-5	Exchangeable senior debentures which are currently callable at par. In addition, the debentures can be put to ROP, at the option of the holder at par plus accrued and unpaid interest, on June 15, 2015 and 2020 and upon the occurrence of certain change of control transactions. As a result of the acquisition of all outstanding shares of common stock of Reckson, or the Reckson Merger, the adjusted exchange rate for the debentures is 7.7461 shares of SL Green's common stock per $1,000 of principal amount of debentures and the adjusted reference dividend for the debentures is $1.3491.
	-6	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 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.
Schedule of combined aggregate principal maturities	'
	Combined aggregate principal maturities of mortgages and other loans payable, the 2012 credit facility, trust preferred securities, senior unsecured notes and our share of joint venture debt as of June 30, 2014, including as-of-right extension options, were as follows (in thousands):
		Scheduled				Principal				Trust			Term Loan and Senior				Total			Joint
		Amortization				Repayments				Preferred			Unsecured							Venture
										Securities			Notes							Debt
	Remaining 2014	$	23,163			$	146,250			$	—		$	75,898			$	245,311		$	27,651
	2015	47,480				229,537				—			7				277,024			44,260
	2016	55,946				514,311				—			255,308				825,565			561,736
	2017	61,063				1,086,579			-1	—			355,008				1,502,650			442,584
	2018	64,462				—				—			250,000				314,462			28
	Thereafter	246,979				3,654,656				100,000			1,233,000				5,234,635			353,580
		$	499,093			$	5,631,333		-1	$	100,000		$	2,169,221			$	8,399,647		$	1,429,839
Schedule of consolidated interest expense, excluding capitalized interest	'
	Consolidated interest expense, excluding capitalized interest, was comprised of the following (in thousands):
			Three Months Ended June 30,							Six Months Ended June 30,
			2014				2013			2014			2013
	Interest expense		$	79,163			$	80,009		$	157,414		$	158,758
	Interest income		(552		)		(458		)	(1,084		)	(898		)
	Interest expense, net		$	78,611			$	79,551		$	156,330		$	157,860
	Interest capitalized		$	6,862			$	3,301		$	11,003		$	6,363

Related_Party_Transactions_Tab

Related Party Transactions (Tables)	6 Months Ended
	Jun. 30, 2014
Related Party Transactions [Abstract]	'
Schedule of amounts due from/to related parties	'
	Amounts due from related parties at June 30, 2014 and December 31, 2013 consisted of the following (in thousands):
		30-Jun-14		December 31, 2013
	Due from joint ventures	$	1,484	$	2,376
	Other	7,431		6,154
	Related party receivables	$	8,915	$	8,530

Noncontrolling_Interests_on_th1

Noncontrolling Interests on the Company's Consolidated Financial Statements (Tables)	6 Months Ended
	Jun. 30, 2014
Noncontrolling Interest [Abstract]	'
Schedule of Noncontrolling Interest	'
	Below is the rollforward analysis of the activity relating to the noncontrolling interests in the Operating Partnership as of June 30, 2014, and December 31, 2013 (in thousands):
		30-Jun-14			December 31, 2013
	Balance at beginning of period	$	265,476		$	212,907
	Distributions	(3,598		)	(4,146		)
	Issuance of common units	19,460			24,750
	Redemption of common units	(23,066		)	(17,287		)
	Net income	13,374			3,023
	Accumulated other comprehensive income allocation	234			611
	Fair value adjustment	107,925			45,618
	Balance at end of period	$	379,805		$	265,476

Stockholders_Equity_of_the_Com1

Stockholders' Equity of the Company (Tables)	6 Months Ended
	Jun. 30, 2014
Stockholders' Equity Note [Abstract]	'
Schedule of Earnings Per Share	'
	SL Green's earnings per share for the three and six months ended June 30, 2014 and 2013 is computed as follows (in thousands):
		Three Months Ended June 30,						Six Months Ended June 30,
	Numerator	2014			2013			2014		2013
	Basic Earnings:
	Income attributable to SL Green common stockholders	$	235,541		$	8,276		$	381,631	$	27,185
	Effect of Dilutive Securities:
	Redemption of units to common shares	8,645			244			13,374		799
	Diluted Earnings:
	Income attributable to SL Green common stockholders	$	244,186		$	8,520		$	395,005	$	27,984
		Three Months Ended June 30,					Six Months Ended June 30,
	Denominator	2014		2013			2014		2013
	Basic Shares:
	Weighted average common stock outstanding	95,455		91,660			95,288		91,530
	Effect of Dilutive Securities:
	Redemption of units to common shares	3,515		2,652			3,339		2,694
	Stock-based compensation plans	514		224			501		228
	Diluted weighted average common stock outstanding	99,484		94,536			99,128		94,452

Partners_Capital_of_the_Operat1

Partners' Capital of the Operating Partnership (Tables)	6 Months Ended
	Jun. 30, 2014
Equity [Abstract]	'
Schedule of calculation of numerator and denominator in earnings per unit	'
	The Operating Partnership's earnings per unit for the three and six months ended June 30, 2014 and 2013 is computed as follows (in thousands):
		Three Months Ended June 30,						Six Months Ended June 30,
	Numerator	2014			2013			2014		2013
	Basic and Diluted Earnings:
	Income attributable to SLGOP common unitholders	$	244,186		$	8,520		$	395,005	$	27,984
		Three Months Ended June 30,					Six Months Ended June 30,
	Denominator	2014		2013			2014		2013
	Basic units:
	Weighted average common units outstanding	98,970		94,312			98,627		94,224
	Effect of Dilutive Securities:
	Stock-based compensation plans	514		224			501		228
	Diluted weighted average common units outstanding	99,484		94,536			99,128		94,452

Sharebased_Compensation_Tables

Share-based Compensation (Tables)	6 Months Ended
	Jun. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Schedule of weighted average assumptions used to estimate the grant date fair value of options granted	'
	The fair value of each stock option granted is estimated on the date of grant using the Black-Scholes option pricing model based on historical information with the following weighted average assumptions for grants during the six months ended June 30, 2014 and the year ended December 31, 2013.
		30-Jun-14			December 31, 2013
	Dividend yield	1.8	%		1.92	%
	Expected life of option	3.7 years			4.1 years
	Risk-free interest rate	0.94	%		0.96	%
	Expected stock price volatility	35	%		36.12	%
Summary of the status of stock options and changes during the period	'
	A summary of the status of the Company's stock options as of June 30, 2014 and December 31, 2013 and changes during the six months ended June 30, 2014 and the year ended December 31, 2013 are as follows:
		30-Jun-14							December 31, 2013
		Options				Weighted			Options			Weighted
		Outstanding				Average			Outstanding			Average
						Exercise						Exercise
						Price						Price
	Balance at beginning of year	1,765,034				$	83.24		1,201,000			$	75.05
	Granted	3,000				98.58			828,100			87.23
	Exercised	(277,145		)		71.27			(223,531		)	53.93
	Lapsed or cancelled	(26,984		)		83.81			(40,535		)	83.94
	Balance at end of period	1,463,905				$	85.53		1,765,034			$	83.24
	Options exercisable at end of period	456,464				$	88.98		461,458			$	89.38
	Weighted average fair value of options granted during the period	$	69,805						$	18,041,576
Summary of restricted stock and charges during the period	'
	A summary of the Company's restricted stock as of June 30, 2014 and December 31, 2013 and charges during the six months ended June 30, 2014 and the year ended December 31, 2013 are presented below:
		30-Jun-14				December 31, 2013
	Balance at beginning of year	2,994,197				2,804,901
	Granted	—				192,563
	Cancelled	(1,434		)		(3,267		)
	Balance at end of period	2,992,763				2,994,197
	Vested during the period	69,293				21,074
	Compensation expense recorded	$	4,678,269			$	6,713,155
	Weighted average fair value of restricted stock granted during the period	$	—			$	17,386,949

Accumulated_Other_Comprehensiv2

Accumulated Other Comprehensive Loss of the Company (Tables) (SL Green Realty Corp)	6 Months Ended
	Jun. 30, 2014
SL Green Realty Corp	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'
Schedule of Accumulated Other Comprehensive Income (Loss)	'
	The following tables set forth the changes in accumulated other comprehensive income (loss) by component as of June 30, 2014:
		Net unrealized loss on derivative instruments (1)			SL Green’s share of joint venture net unrealized income (loss) on derivative instruments (2)			Unrealized gains and loss on marketable securities		Total
	Balance at December 31, 2013	$	(15,125	)	$	(4,870	)	$	4,784	$	(15,211	)
	Other comprehensive income (loss) before reclassifications	(420		)	4,068			1,702		5,350
	Amounts reclassified from accumulated other comprehensive income	1,898			1,767			—		3,665
	Balance at June 30, 2014	$	(13,647	)	$	965		$	6,486	$	(6,196	)
	___________________________
	-1	Amounts reclassified from accumulated other comprehensive income (loss) are included in interest expense in the respective consolidated statements of income. As of June 30, 2014 and December 31, 2013, the deferred net losses from these terminated hedges, which are included in accumulated other comprehensive loss relating to net unrealized loss on derivative instrument, were $12.8 million and $13.8 million, respectively.
	-2	Amounts reclassified from accumulated other comprehensive income are included in equity in net income from unconsolidated joint ventures in the respective consolidated statements of income.

Accumulated_Other_Comprehensiv3

Accumulated Other Comprehensive Loss of the Operating Partnership (Tables) (SL Green Operating Partnership)	6 Months Ended
	Jun. 30, 2014
SL Green Operating Partnership	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'
Schedule of Accumulated Other Comprehensive Income (Loss)	'
	The following tables set forth the changes in accumulated other comprehensive income (loss) by component as of June 30, 2014:
		Net unrealized loss on derivative instruments (1)			SLGOP’s share of joint venture net unrealized income (loss) on derivative instruments (2)			Unrealized gains and loss on marketable securities		Total
	Balance at December 31, 2013	$	(15,573	)	$	(5,015	)	$	4,926	$	(15,662	)
	Other comprehensive (loss) income before reclassifications	(516		)	4,184			1,788		5,456
	Amounts reclassified from accumulated other comprehensive income	1,964			1,829			—		3,793
	Balance at June 30, 2014	$	(14,125	)	$	998		$	6,714	$	(6,413	)
	___________________________
	-1	Amount reclassified from accumulated other comprehensive income (loss) are included in interest expense in the respective consolidated statements of income. As of June 30, 2014 and December 31, 2013, the deferred net losses from these terminated hedges, which are included in accumulated other comprehensive loss relating to net unrealized loss on derivative instrument, were $13.2 million and $14.2 million, respectively.
	-2	Amounts reclassified from accumulated other comprehensive income are included in equity in net income from unconsolidated joint ventures in the respective consolidated statements of income.

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	6 Months Ended
	Jun. 30, 2014
Fair Value Disclosures [Abstract]	'
Fair Value Measurements, Recurring and Nonrecurring	'
	The following tables set forth the assets and liabilities that we measure at fair value on a recurring and non-recurring basis by their levels in the fair value hierarchy at June 30, 2014 and December 31, 2013, respectively (in thousands):
		June 30, 2014
		Total		Level 1		Level 2		Level 3
	Assets:
	Marketable securities	$	39,912	$	4,532	$	35,380	$	—
	Liabilities:
	Interest rate swap agreements (included in accrued interest payable and other liabilities)	$	18,454	$	—	$	18,454	$	—
		December 31, 2013
		Total		Level 1		Level 2		Level 3
	Assets:
	Marketable securities	$	32,049	$	4,307	$	24,419	$	3,323
	Liabilities:
	Interest rate swap agreements (included in accrued interest payable and other liabilities)	$	1,329	$	—	$	1,329	$	—
Fair Value, by Balance Sheet Grouping	'
	The following table provides the carrying value and fair value of these financial instruments as of June 30, 2014 and December 31, 2013 (in thousands):
		June 30, 2014				December 31, 2013
		Carrying Value		Fair Value		Carrying Value		Fair Value
	Debt and preferred equity investments	$	1,547,808	-1		$	1,304,839	-1
	Fixed rate debt	$	6,096,280	$	6,533,273	$	5,599,960	$	5,886,980
	Variable rate debt	2,261,352		2,279,257		1,319,948		1,327,422
		$	8,357,632	$	8,812,530	$	6,919,908	$	7,214,402
	_____________________________________
	-1	Debt and preferred equity investments had an estimated fair value ranging between $1.5 billion and $1.7 billion at June 30, 2014. At December 31, 2013, debt and preferred equity investments had an estimated fair value ranging between $1.3 billion and $1.4 billion.

Financial_Instruments_Derivati1

Financial Instruments: Derivatives and Hedging (Tables)	6 Months Ended
	Jun. 30, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'
Schedule of notional and fair value of derivative financial instruments and foreign currency hedges	'
	The following table summarizes the notional and fair value of our consolidated derivative financial instruments at June 30, 2014 based on Level 2 information pursuant to ASC 810-10. 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.
		Notional				Strike			Effective	Expiration	Balance Sheet Location		Fair Value
		Value				Rate			Date	Date			(in thousands)
		(in thousands)
	Interest Rate Cap	$	263,426			6	%		Nov-13	Nov-15	Other Assets		$	4
	Interest Rate Cap	137,500				4	%		Oct-13	Sep-15	Other Assets		3
	Interest Rate Cap	946,000				4.75	%		May-14	May-16	Other Assets		36
	Interest Rate Swap(1)	144,000				2.236	%		Dec-12	Dec-17	Other Liabilities		(5,859		)
	Interest Rate Swap(1)	72,000				2.31	%		Dec-12	Dec-17	Other Liabilities		(3,109		)
	Interest Rate Swap(1)	72,000				2.31	%		Dec-12	Dec-17	Other Liabilities		(3,109		)
	Interest Rate Swap(1)	57,600				1.99	%		Dec-12	Dec-17	Other Liabilities		(1,859		)
	Interest Rate Swap(1)	86,400				1.948	%		Dec-12	Dec-17	Other Liabilities		(2,664		)
	Interest Rate Swap(1)	72,000				1.345	%		Dec-12	Dec-17	Other Liabilities		(747		)
	Interest Rate Swap	30,000				2.295	%		Jul-10	Jun-16	Other Liabilities		(1,078		)
	Interest Rate Swap	8,500				0.74	%		Feb-12	Feb-15	Other Liabilities		(29		)
													$	(18,411	)
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 income for the six months ended June 30, 2014 and 2013, respectively (in thousands):
			Amount of Gain or (Loss)							Location of Gain or (Loss) Reclassified from Accumulated Other Comprehensive Income into Income	Amount of Loss						Location of Gain (Loss) Recognized in Income on Derivative	Amount of Gain
			Recognized in								Reclassified from							Recognized
			Other Comprehensive								Accumulated Other							into Income
			Loss								Comprehensive Loss  into Income							(Ineffective Portion)
			(Effective Portion)								(Effective Portion)
			Six Months Ended								Six Months Ended							Six Months Ended
			June 30,								June 30,							June 30,
	Derivative		2014				2013				2014				2013			2014		2013
	Interest Rate Swaps/Caps		$	(516	)		$	140		Interest expense	$	1,964			$	938	Interest expense	$	2	$	—
	Share of unconsolidated joint ventures' derivative instruments		4,184				8,109			Equity in net income from unconsolidated joint ventures	1,829				2,500		Equity in net income from unconsolidated joint ventures	—		5
			$	3,668			$	8,249			$	3,793			$	3,438		$	2	$	5

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	6 Months Ended
	Jun. 30, 2014
Commitments and Contingencies Disclosure [Abstract]	'
Schedule of future minimum lease payments under capital leases and non cancellable operating leases	'
	The following is a schedule of future minimum lease payments under capital leases and noncancellable operating leases with initial terms in excess of one year as of June 30, 2014 (in thousands):
		Capital lease			Non-cancellable
					operating leases
	Remaining 2014	$	73		$	15,351
	2015	145			30,703
	2016	170			30,824
	2017	291			31,057
	2018	291			31,057
	Thereafter	56,884			766,187
	Total minimum lease payments	57,854			$	905,179
	Less amount representing interest	(37,219		)
	Capitalized lease obligations	$	20,635

Segment_Information_Tables

Segment Information (Tables)	6 Months Ended
	Jun. 30, 2014
Segment Reporting [Abstract]	'
Schedule of selected results of operations and selected asset information	'
	Selected results of operations for the three and six months ended June 30, 2014 and 2013, and selected asset information as of June 30, 2014 and December 31, 2013, regarding our operating segments are as follows (in thousands):
		Real			Debt and Preferred			Total
		Estate			Equity			Company
		Segment			Segment
	Total revenues
	Three months ended:
	30-Jun-14	$	347,513		$	39,714		$	387,227
	30-Jun-13	307,213			46,731			353,944
	Six months ended:
	30-Jun-14	$	668,998		$	93,798		$	762,796
	30-Jun-13	608,126			99,439			707,565
	Income (loss) from continuing operations before equity in net gain on sale of interest in unconsolidated joint venture/real estate
	Three months ended:
	30-Jun-14	$	24,318		$	34,000		$	58,318
	30-Jun-13	(4,742		)	38,040			33,298
	Six months ended:
	30-Jun-14	$	26,918		$	79,582		$	106,500
	30-Jun-13	(23,548		)	81,389			57,841
	Total assets
	As of:
	30-Jun-14	$	15,155,384		$	1,562,352		$	16,717,736
	31-Dec-13	13,641,727			1,317,274			14,959,001
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 and six months ended June 30, 2014 and 2013 (in thousands):
		Three Months Ended June 30,						Six Months Ended June 30,
		2014			2013			2014		2013
	Income from continuing operations before purchase price fair value adjustment and equity in net gain (loss) on sale of interest in unconsolidated joint venture/real estate	$	58,318		$	33,298		$	106,500	$	57,841
	Purchase price fair value adjustment	71,446			(2,305		)	71,446		(2,305		)
	Equity in net gain (loss) on sale of interest in unconsolidated joint venture/real estate	1,444			(3,583		)	106,084		(3,583		)
	Income from continuing operations	131,208			27,410			284,030		51,953
	Net income from discontinued operations	4,389			3,838			8,178		8,519
	Gain on sale of discontinued operations	114,735			—			114,735		1,113
	Net income	$	250,332		$	31,248		$	406,943	$	61,585

Organization_and_Basis_of_Pres2

Organization and Basis of Presentation (Details) (SL Green Operating Partnership)	1 Months Ended
	Jun. 30, 1997	Jun. 30, 2014	Dec. 31, 2013
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)	'	3.53%	2.96%
Primary Beneficiary	'	'	'
Organization	'	'	'
Economic interest in variable interest entity (as a percent)	95.00%	'	'

Organization_and_Basis_of_Pres3

Organization and Basis of Presentation (Details 2) (USD $)	6 Months Ended
In Thousands, except Share data, unless otherwise specified	Jun. 30, 2014		Dec. 31, 2013
	sqft
	building
Real estate properties	'		'
Number of properties	99		'
Square Feet (sqft)	33,867,788		'
Weighted Average Occupancy (percent)	86.70%	[1]	'
Debt and preferred equity investments	$1,547,808		$1,304,839
Number of shares to be received on redemption of one unit of limited partnership interests (shares)	1		'
Commercial Property	'		'
Real estate properties	'		'
Number of properties	96		'
Square Feet (sqft)	33,147,840		'
Weighted Average Occupancy (percent)	86.60%	[1]	'
Residential	'		'
Real estate properties	'		'
Number of properties	3		'
Square Feet (sqft)	719,948		'
Weighted Average Occupancy (percent)	91.90%	[1]	'
Managed office properties	'		'
Real estate properties	'		'
Square Feet (sqft)	336,200		'
Consolidated properties	'		'
Real estate properties	'		'
Number of properties	75		'
Square Feet (sqft)	27,065,900		'
Consolidated properties | Commercial Property	'		'
Real estate properties	'		'
Number of properties	72		'
Square Feet (sqft)	26,345,952		'
Consolidated properties | Residential	'		'
Real estate properties	'		'
Number of properties	3		'
Square Feet (sqft)	719,948		'
Unconsolidated properties	'		'
Real estate properties	'		'
Number of properties	24		'
Square Feet (sqft)	6,801,888		'
Unconsolidated properties | Commercial Property	'		'
Real estate properties	'		'
Number of properties	24		'
Square Feet (sqft)	6,801,888		'
Unconsolidated properties | Residential	'		'
Real estate properties	'		'
Number of properties	0		'
Square Feet (sqft)	0		'
Manhattan	'		'
Real estate properties	'		'
Number of properties	62		'
Square Feet (sqft)	27,357,699		'
Weighted Average Occupancy (percent)	87.80%	[1]	'
Manhattan | Office	'		'
Real estate properties	'		'
Number of properties	30		'
Square Feet (sqft)	21,905,160		'
Weighted Average Occupancy (percent)	94.40%	[1]	'
Manhattan | Retail	'		'
Real estate properties	'		'
Number of properties	15		'
Square Feet (sqft)	821,567		'
Weighted Average Occupancy (percent)	93.20%	[1]	'
Manhattan | Development	'		'
Real estate properties	'		'
Number of properties	15		'
Square Feet (sqft)	3,669,572		'
Weighted Average Occupancy (percent)	44.20%	[1]	'
Manhattan | Fee Interest	'		'
Real estate properties	'		'
Number of properties	2		'
Square Feet (sqft)	961,400		'
Weighted Average Occupancy (percent)	100.00%	[1]	'
Manhattan | Residential	'		'
Real estate properties	'		'
Number of properties	2		'
Square Feet (sqft)	653,337		'
Weighted Average Occupancy (percent)	93.20%	[1]	'
Manhattan | Consolidated properties	'		'
Real estate properties	'		'
Number of properties	43		'
Square Feet (sqft)	21,843,552		'
Manhattan | Consolidated properties | Office	'		'
Real estate properties	'		'
Number of properties	23		'
Square Feet (sqft)	18,429,045		'
Manhattan | Consolidated properties | Retail	'		'
Real estate properties	'		'
Number of properties	7	[2]	'
Square Feet (sqft)	389,317		'
Manhattan | Consolidated properties | Development	'		'
Real estate properties	'		'
Number of properties	11		'
Square Feet (sqft)	2,063,790		'
Manhattan | Consolidated properties | Fee Interest	'		'
Real estate properties	'		'
Number of properties	2		'
Square Feet (sqft)	961,400		'
Manhattan | Consolidated properties | Residential	'		'
Real estate properties	'		'
Number of properties	2	[2]	'
Square Feet (sqft)	653,337		'
Manhattan | Consolidated properties | Dual Property Type, Residential Portion	'		'
Real estate properties	'		'
Square Feet (sqft)	222,855		'
Manhattan | Consolidated properties | Dual Property Type, Retail Portion	'		'
Real estate properties	'		'
Square Feet (sqft)	270,132		'
Manhattan | Unconsolidated properties	'		'
Real estate properties	'		'
Number of properties	19		'
Square Feet (sqft)	5,514,147		'
Manhattan | Unconsolidated properties | Office	'		'
Real estate properties	'		'
Number of properties	7		'
Square Feet (sqft)	3,476,115		'
Manhattan | Unconsolidated properties | Retail	'		'
Real estate properties	'		'
Number of properties	8		'
Square Feet (sqft)	432,250		'
Manhattan | Unconsolidated properties | Development	'		'
Real estate properties	'		'
Number of properties	4		'
Square Feet (sqft)	1,605,782		'
Manhattan | Unconsolidated properties | Fee Interest	'		'
Real estate properties	'		'
Number of properties	0		'
Square Feet (sqft)	0		'
Manhattan | Unconsolidated properties | Residential	'		'
Real estate properties	'		'
Number of properties	0		'
Square Feet (sqft)	0		'
Suburban	'		'
Real estate properties	'		'
Number of properties	34		'
Square Feet (sqft)	5,790,141		'
Weighted Average Occupancy (percent)	80.90%	[1]	'
Suburban | Office	'		'
Real estate properties	'		'
Number of properties	31		'
Square Feet (sqft)	5,587,500		'
Weighted Average Occupancy (percent)	81.70%	[1]	'
Suburban | Retail	'		'
Real estate properties	'		'
Number of properties	1		'
Square Feet (sqft)	52,000		'
Weighted Average Occupancy (percent)	100.00%	[1]	'
Suburban | Development	'		'
Real estate properties	'		'
Number of properties	2		'
Square Feet (sqft)	150,641		'
Weighted Average Occupancy (percent)	42.70%	[1]	'
Suburban | Residential	'		'
Real estate properties	'		'
Number of properties	1		'
Square Feet (sqft)	66,611		'
Weighted Average Occupancy (percent)	84.40%	[1]	'
Suburban | Consolidated properties	'		'
Real estate properties	'		'
Number of properties	29		'
Square Feet (sqft)	4,502,400		'
Suburban | Consolidated properties | Office	'		'
Real estate properties	'		'
Number of properties	27		'
Square Feet (sqft)	4,365,400		'
Suburban | Consolidated properties | Retail	'		'
Real estate properties	'		'
Number of properties	1		'
Square Feet (sqft)	52,000		'
Suburban | Consolidated properties | Development	'		'
Real estate properties	'		'
Number of properties	1		'
Square Feet (sqft)	85,000		'
Suburban | Consolidated properties | Residential	'		'
Real estate properties	'		'
Number of properties	1		'
Square Feet (sqft)	66,611		'
Suburban | Unconsolidated properties	'		'
Real estate properties	'		'
Number of properties	5		'
Square Feet (sqft)	1,287,741		'
Suburban | Unconsolidated properties | Office	'		'
Real estate properties	'		'
Number of properties	4		'
Square Feet (sqft)	1,222,100		'
Suburban | Unconsolidated properties | Retail	'		'
Real estate properties	'		'
Number of properties	0		'
Square Feet (sqft)	0		'
Suburban | Unconsolidated properties | Development	'		'
Real estate properties	'		'
Number of properties	1		'
Square Feet (sqft)	65,641		'
Suburban | Unconsolidated properties | Residential	'		'
Real estate properties	'		'
Number of properties	0		'
Square Feet (sqft)	0		'
[1]	The weighted average occupancy for commercial properties represents the total occupied square feet divided by total available rentable square feet. The weighted average occupancy for residential properties represents the total occupied units divided by total available units.
[2]	As of JuneB 30, 2014, we owned a building that was comprised of 270,132 square feet of retail space and 222,855 square feet of residential space. For the purpose of this report, we have included the building as part of retail properties and have shown the square footage under its respective classifications.

Significant_Accounting_Policie3

Significant Accounting Policies (Details) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Principles of Consolidation	'	'
Commercial real estate properties	$11,957,923	$10,687,540
Mortgages and other loans payable	5,939,176	4,860,578
Consolidated VIEs	'	'
Principles of Consolidation	'	'
Commercial real estate properties	609,400	605,900
Mortgages and other loans payable	$365,800	$370,900

Significant_Accounting_Policie4

Significant Accounting Policies (Details 2) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Investment in Commercial Real Estate Properties	'	'	'	'	'
Increase in rental revenue from amortization of acquired leases	$6,200,000	$6,200,000	$11,000,000	$10,100,000	'
Reduction in interest expense from amortization of above-market rate mortgages	-1,300,000	-1,200,000	-2,800,000	-2,400,000	'
Identified intangible assets (included in other assets):	'	'	'	'	'
Gross amount	702,189,000	'	702,189,000	'	746,704,000
Accumulated amortization	-382,231,000	'	-382,231,000	'	-343,339,000
Net	319,958,000	'	319,958,000	'	403,365,000
Identified intangible liabilities (included in deferred revenue):	'	'	'	'	'
Gross amount	676,075,000	'	676,075,000	'	671,380,000
Accumulated amortization	-461,952,000	'	-461,952,000	'	-429,138,000
Net	$214,123,000	'	$214,123,000	'	$242,242,000
Above and below market leases | Minimum	'	'	'	'	'
Investment in Commercial Real Estate Properties	'	'	'	'	'
Estimated useful life of other intangible assets	'	'	'1 year	'	'
Above and below market leases | Maximum	'	'	'	'	'
Investment in Commercial Real Estate Properties	'	'	'	'	'
Estimated useful life of other intangible assets	'	'	'14 years	'	'
In-place leases | Minimum	'	'	'	'	'
Investment in Commercial Real Estate Properties	'	'	'	'	'
Estimated useful life of other intangible assets	'	'	'1 year	'	'
In-place leases | Maximum	'	'	'	'	'
Investment in Commercial Real Estate Properties	'	'	'	'	'
Estimated useful life of other intangible assets	'	'	'14 years	'	'
Building | Minimum	'	'	'	'	'
Investment in Commercial Real Estate Properties	'	'	'	'	'
Estimated useful life	'	'	'3 years	'	'
Building | Maximum	'	'	'	'	'
Investment in Commercial Real Estate Properties	'	'	'	'	'
Estimated useful life	'	'	'40 years	'	'

Significant_Accounting_Policie5

Significant Accounting Policies (Details 3) (USD $)	Jun. 30, 2014	Dec. 31, 2013
Investment in Marketable Securities	'	'
Marketable securities	$39,912,000	$32,049,000
Commercial mortgage-backed securities	'	'
Investment in Marketable Securities	'	'
Cost basis	32,600,000	23,000,000
Rake bonds	'	'
Investment in Marketable Securities	'	'
Cost basis	'	3,600,000
Level 1	'	'
Investment in Marketable Securities	'	'
Marketable securities	4,532,000	4,307,000
Level 2	'	'
Investment in Marketable Securities	'	'
Marketable securities	35,380,000	24,419,000
Level 3	'	'
Investment in Marketable Securities	'	'
Marketable securities	0	3,323,000
Fair Value	'	'
Investment in Marketable Securities	'	'
Marketable securities	$39,912,000	$32,049,000

Significant_Accounting_Policie6

Significant Accounting Policies (Details 4) (USD $)	3 Months Ended		6 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
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	$2.10	$2.30	$5	$3.90

Significant_Accounting_Policie7

Significant Accounting Policies (Details 5)	6 Months Ended
	Jun. 30, 2014
	Tenant
Annualized rent | Customer concentration	'
Concentration of Credit Risk	'
Number of tenants (tenants)	3
Maximum percentage of annualized rent for any one tenant not individually disclosed (percent)	2.00%
Annualized rent | 1515 Broadway | Customer concentration	'
Concentration of Credit Risk	'
Percentage of concentration (percent)	9.70%
Annualized rent | 388 and 390 Greenwich Street | Customer concentration	'
Concentration of Credit Risk	'
Percentage of concentration (percent)	9.60%
Annualized rent | 1185 Avenue of the Americas | Customer concentration	'
Concentration of Credit Risk	'
Percentage of concentration (percent)	7.30%
Annualized rent | Tenant 1 | Customer concentration	'
Concentration of Credit Risk	'
Percentage of concentration (percent)	11.20%
Annualized rent | Tenant 2 | Customer concentration	'
Concentration of Credit Risk	'
Percentage of concentration (percent)	7.30%
Annualized rent | Tenant 3 | Customer concentration	'
Concentration of Credit Risk	'
Percentage of concentration (percent)	5.70%
Revenue earned on debt and preferred equity investments | Credit concentration	'
Concentration of Credit Risk	'
Number of investments (investment)	1
Minimum revenue on debt and preferred equity investments (percent)	13.30%

Property_Acquisitions_Details

Property Acquisitions (Details) (USD $)	3 Months Ended		6 Months Ended		0 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	31-May-14	31-May-14	Mar. 31, 2014	Nov. 30, 2013
	sqft		sqft		Greenwich Street 388-390	Greenwich Street 388-390	Mixed-Use Residential and Commercial Property	Mixed-Use Residential and Commercial Property
						sqft	315 West 33rd Street	315 West 33rd Street
								sqft
Business Acquisition [Line Items]	'	'	'	'	'	'	'	'
Economic interest	'	'	'	'	'	49.65%	'	'
Area of property (sqft)	33,867,788	'	33,867,788	'	'	2,400,000	'	492,987
Notional Value	'	'	'	'	'	$504,000,000	'	'
Real Estate fair value	'	'	'	'	'	1,585,000,000	'	'
Payment for property	'	'	'	'	'	'	'	386,800,000
Term	'	'	'	'	'4 years	'	'	'
Face amount of loan	'	'	'	'	'	1,500,000,000	'	'
Debt refinanced	'	'	'	'	1,100,000,000	'	'	'
Interest rate added to base rate (as a percent)	'	'	'	'	1.75%	'	'	'
Purchase price fair value adjustment	71,446,000	-2,305,000	71,446,000	-2,305,000	71,400,000	'	'	'
Land	'	'	'	'	'	'	'	116,000,000
Building	'	'	'	'	'	'	'	270,800,000
Above-market and in-place leases	'	'	'	'	'	'	33,200,000	'
Below market leases	'	'	'	'	'	'	$7,800,000	'

Property_Acquisitions_Details_

Property Acquisitions (Details 2) (388 and 390 Greenwich Street, USD $)	3 Months Ended		6 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
388 and 390 Greenwich Street	'	'	'	'
Business Acquisition [Line Items]	'	'	'	'
Actual revenues since acquisition	$14,897	'	$14,897	'
Actual net income since acquisition	76,844	'	76,844	'
Pro forma revenues	400,812	381,397	804,863	762,471
Pro forma income from continuing operations	$61,930	$27,437	$218,835	$127,081
Pro forma basic earnings per share	$1.77	$0.09	$3.34	$1.09
Pro forma diluted earnings per share	$1.76	$0.09	$3.33	$1.09
Pro forma basic earnings per unit	1.77	0.09	3.34	1.09
Pro forma diluted earnings per unit	1.76	0.09	3.33	1.09

Properties_Held_for_Sale_and_D2

Properties Held for Sale and Dispositions (Details) (USD $)	3 Months Ended		6 Months Ended		1 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Apr. 30, 2014	31-May-14
					2 Herald Square	Third Avenue 985 and 987	673 First Avenue
Property Dispositions and Assets Held for Sale	'	'	'	'	'	'	'
Agreed sale consideration	'	'	'	'	$365,000,000	$68,700,000	$145,000,000
Gain on sale of discontinued operations	114,735,000	0	114,735,000	1,113,000	'	'	117,800,000
Revenues	'	'	'	'	'	'	'
Rental revenue	8,366,000	15,494,000	19,000,000	30,155,000	'	'	'
Escalation and reimbursement revenues	258,000	789,000	1,080,000	1,985,000	'	'	'
Other income	2,000	2,000	2,000	485,000	'	'	'
Total revenues	8,626,000	16,285,000	20,082,000	32,625,000	'	'	'
Operating expenses	291,000	2,362,000	1,179,000	4,832,000	'	'	'
Real estate taxes	383,000	1,245,000	1,402,000	2,489,000	'	'	'
Ground rent	805,000	719,000	3,001,000	3,582,000	'	'	'
Interest expense, net of interest income	2,707,000	3,892,000	5,827,000	6,918,000	'	'	'
Amortization of deferred financing costs	11,000	11,000	22,000	22,000	'	'	'
Depreciable real estate reserves	0	2,150,000	0	2,150,000	'	'	'
Depreciation and amortization	0	2,060,000	433,000	4,126,000	'	'	'
Transaction related costs, net of recoveries	40,000	8,000	40,000	-13,000	'	'	'
Total expenses	4,237,000	12,447,000	11,904,000	24,106,000	'	'	'
Net income from discontinued operations	$4,389,000	$3,838,000	$8,178,000	$8,519,000	'	'	'

Debt_and_Preferred_Equity_Inve2

Debt and Preferred Equity Investments (Details) (USD $)

6 Months Ended

3 Months Ended

6 Months Ended

1 Months Ended

Jun. 30, 2014

Jun. 30, 2013

Dec. 31, 2013

Dec. 31, 2012

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Mar. 31, 2014

Jun. 30, 2014

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Debt investment

Debt investment

Total fixed rate

Total fixed rate

Total fixed rate

Total fixed rate

Total fixed rate

Total fixed rate

Total fixed rate

Total fixed rate

Total fixed rate

Total fixed rate

Total fixed rate

Total fixed rate

Total fixed rate

Total fixed rate

Total fixed rate

Total fixed rate

Total fixed rate

Total fixed rate

Total fixed rate

Total fixed rate

Total fixed rate

Total fixed rate

Total fixed rate

Total fixed rate

Total fixed rate

Total fixed rate

Total fixed rate

Total fixed rate

Total floating rate

Total floating rate

Total floating rate

Total floating rate

Total floating rate

Total floating rate

Total floating rate

Total floating rate

Total floating rate

Total floating rate

Total floating rate

Total floating rate

Total floating rate

Total floating rate

Total floating rate

Total floating rate

Total floating rate

Total floating rate

Total floating rate

Total floating rate

Total floating rate

Total floating rate

Total floating rate

Total floating rate

Total floating rate

Total floating rate

Total floating rate

Total floating rate

Total floating rate

Total floating rate

Total floating rate

Total floating rate

Total floating rate

Total floating rate

Total floating rate

Total floating rate

Total floating rate

Total floating rate

Total floating rate

Total floating rate

Jr. Mortgage Participation, March 2015

Jr. Mortgage Participation, March 2015

Jr. Mortgage Participation/Mezzanine Loan, February 2016

Jr. Mortgage Participation/Mezzanine Loan, February 2016

Jr. Mortgage Participation/Mezzanine Loan, May 2016

Jr. Mortgage Participation/Mezzanine Loan, May 2016

Mezzanine Loan, May 2016

Mezzanine Loan, May 2016

Jr. Mortgage Participation, June 2016

Jr. Mortgage Participation, June 2016

Mezzanine Loan, November 2016

Mezzanine Loan, November 2016

Jr. Mortgage Participation/Mezzanine Loan, March 2017

Jr. Mortgage Participation/Mezzanine Loan, March 2017

Other, March 2017

Other, March 2017

Mezzanine Loan, June 2017

Mezzanine Loan, June 2017

Mortgage Loan, August 2019

Mortgage Loan, August 2019

Mezzanine Loan, September 2021

Mezzanine Loan, September 2021

Mezzanine Loan, November 2023

Mezzanine Loan, November 2023

Jr. Mortgage Participation, June 2014

Jr. Mortgage Participation, June 2014

Mezzanine Loan, November 2016

Mezzanine Loan, November 2016

Jr. Mortgage Participation/Mezzanine Loan, July 2014

Jr. Mortgage Participation/Mezzanine Loan, July 2014

Mezzanine Loan, August 2014

Mezzanine Loan, August 2014

Jr. Mortgage Participation, August 2014

Jr. Mortgage Participation, August 2014

Mezzanine Loan, September 2014

Mezzanine Loan, September 2014

Mezzanine Loan, October 2014

Mezzanine Loan, October 2014

Jr. Mortgage Participation, February 2015

Jr. Mortgage Participation, February 2015

Mezzanine Loan April 2015

Mezzanine Loan April 2015

Mortgage/Mezzanine Loan June 2015

Mortgage/Mezzanine Loan June 2015

Mezzanine Loan, September 2015

Mezzanine Loan, September 2015

Mezzanine Loan, December 2015

Mezzanine Loan, December 2015

Mezzanine Loan, March 2016

Mezzanine Loan, March 2016

Mezzanine Loan, June 2016

Mezzanine Loan, June 2016

Mezzanine Loan, July 2016

Mezzanine Loan, July 2016

Mezzanine Loan, December 2016

Mezzanine Loan, December 2016

Jr. Mortgage Participation/Mezzanine Loan, July 2018

Jr. Mortgage Participation/Mezzanine Loan, July 2018

Mortgage/Mezzanine Loan, February 2019

Mortgage/Mezzanine Loan, February 2019

Mezzanine Loan, March 2019

Mezzanine Loan, March 2019

Mortgage Loan

Mortgage Loan

Debt investment

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'

'

'

'

'

'

'

'

'

Increase in debt and preferred equity investments (net of discounts), including investments classified as held-for-sale

$303,400,000

$298,800,000

'

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'

'

'

'

'

'

Decrease in debt and preferred equity investments (net of discounts), including investments classified as held-for-sale

60,400,000

419,800,000

'

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'

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'

'

'

Aggregate weighted average current yield (as a percent)

10.69%

'

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'

'

'

Funding Obligations

'

'

'

'

72,468,000

'

19,725,000

'

0

'

0

'

0

'

0

'

0

'

0

'

0

[1]

'

0

[1]

'

19,725,000

[2]

'

0

'

0

'

0

[3]

'

'

'

52,743,000

'

10,584,000

'

0

[4]

'

0

[5]

'

0

[6]

'

0

[7]

'

9,794,000

'

0

[8]

'

22,817,000

'

0

'

0

'

9,215,000

'

0

'

0

[9]

'

0

'

333,000

'

0

'

0

'

0

'

0

[10]

'

Senior Financing

'

'

'

'

5,818,222,000

'

2,979,409,000

'

398,500,000

'

205,000,000

'

165,159,000

'

177,000,000

'

133,000,000

'

165,000,000

'

1,109,000,000

[1]

'

0

[1]

'

521,750,000

[2]

'

0

'

15,000,000

'

90,000,000

[3]

'

'

'

2,838,813,000

'

168,485,000

'

330,000,000

[4]

'

180,000,000

[5]

'

57,750,000

[6]

'

481,309,000

[7]

'

93,279,000

'

84,000,000

[8]

'

50,000,000

'

0

'

110,000,000

'

107,157,000

'

775,000,000

'

160,000,000

[9]

'

115,000,000

'

33,833,000

'

55,000,000

'

0

'

38,000,000

'

0

[10]

'

Carrying Value, Net of Discounts

'

'

'

'

'

'

467,757,000

[11]

385,604,000

[11]

11,893,000

[11]

11,856,000

[11]

69,480,000

[11]

68,319,000

[11]

45,137,000

[11]

44,742,000

[11]

14,519,000

[11]

15,012,000

[11]

49,000,000

[11]

49,000,000

[11]

71,430,000

[11]

71,312,000

[11]

95,329,000

[1],[11]

26,884,000

[1],[11]

65,578,000

[1],[11]

54,099,000

[1],[11]

21,267,000

[11],[2]

20,954,000

[11],[2]

696,000

[11]

0

[11]

3,500,000

[11]

3,500,000

[11]

19,928,000

[11],[3]

19,926,000

[11],[3]

'

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'

'

'

'

'

'

Debt and preferred equity investments

1,547,808,000

'

1,304,839,000

'

1,195,672,000

[11]

936,475,000

[11]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

30,000,000

727,915,000

[11]

550,871,000

[11]

26,655,000

[11]

25,725,000

[11]

131,987,000

[11],[4]

131,724,000

[11],[4]

59,974,000

[11],[5]

59,892,000

[11],[5]

10,875,000

[11],[6]

10,873,000

[11],[6]

19,487,000

[11],[7]

0

[11],[7]

40,125,000

[11]

38,549,000

[11]

24,959,000

[11],[8]

24,046,000

[11],[8]

22,002,000

[11]

0

[11]

108,981,000

[11]

0

[11]

49,354,000

[11]

49,110,000

[11]

40,662,000

[11]

27,662,000

[11]

73,326,000

[11]

72,823,000

[11]

22,549,000

[11],[9]

22,526,000

[11],[9]

24,907,000

[11]

25,590,000

[11]

11,816,000

[11]

11,798,000

[11]

20,544,000

[11]

20,553,000

[11]

17,923,000

[11]

0

[11]

21,789,000

[11]

0

[11]

0

[10],[11]

30,000,000

[10],[11]

Payments to Acquire Investments

256,730,000

277,877,000

'

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'

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'

'

67,300,000

'

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'

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'

'

Loan loss reserve

0

'

-1,000,000

-7,000,000

0

[11]

-1,000,000

[11]

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'

'

'

Total, net of reserve

'

'

'

'

1,195,672,000

[11]

935,475,000

[11]

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'

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'

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'

'

Accretion of unaccrued interest

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

10,100,000

'

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'

'

'

'

'

Face amount of mortgages

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

66,700,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Loan participation amount included in other assets and other liabilities

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

41,300,000

'

'

'

'

'

5,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

7,400,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Repayments or redemption of debt and preferred equity investments

$60,412,000

$432,667,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$10,800,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

[1]

During the three months ended March 31, 2014, we recognized $10.1 million of previously unaccrued interest income as deemed collectible as a result of the subsequent sale of the property, which closed in June 2014. In connection with the sale of the underlying property, our existing $66.7 million mezzanine loan was defeased and is now shown separately, as it is collateralized by defeasance securities. The buyer assumed our $30.0 million participating interest on the mortgage and we acquired a $67.3 million participating interest on the mezzanine loan.

[2]

Carrying value is net of $41.3 million that was participated out, which is included in other assets and other liabilities on the consolidated balance sheets as a result of the transfer not meeting the conditions for sale accounting.

[3]

Carrying value is net of $5.0 million that was participated out, which is included in other assets and other liabilities on the consolidated balance sheets as a result of the transfer not meeting the conditions for sale accounting.

[4]

This loan was repaid in July 2014.

[5]

This loan was repaid in August 2014.

[6]

In June 2014, the loan maturity date was extended to August 2014 and $10.8 million has been repaid.

[7]

This loan was previously included in other assets on the consolidated balance sheets. Following the sale of our interest in the partnership that is the borrower, the loan was reclassified to debt and preferred equity investments.

[8]

In March 2014, the loan was extended to February 2015.

[9]

Carrying value is net of $7.4 million that was participated out, which is included in other assets and other liabilities on the consolidated balance sheets as a result of the transfer not meeting the conditions for sale accounting.

[10]

This loan was repaid in May 2014.

[11]

Carrying value is net of discounts, original issue discounts and deferred origination fees.

Debt_and_Preferred_Equity_Inve3

Debt and Preferred Equity Investments (Details 2) (USD $)	6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014		Dec. 31, 2013
Preferred equity investment	'		'
Aggregate weighted average current yield (as a percent)	10.69%		'
Debt and preferred equity investments	$1,547,808		$1,304,839
Preferred equity investments	'		'
Preferred equity investment	'		'
Aggregate weighted average current yield (as a percent)	9.75%		'
Senior Financing	1,521,260		'
Debt and preferred equity investments	352,136	[1]	369,364	[1]
Preferred equity with initial mandatory redemption in July 2015	'		'
Preferred equity investment	'		'
Senior Financing	525,000	[2]	'
Debt and preferred equity investments	119,197	[1],[2]	115,198	[1],[2]
Preferred equity with initial mandatory redemption in July, 2016	'		'
Preferred equity investment	'		'
Senior Financing	926,260	[2]	'
Debt and preferred equity investments	222,992	[1],[2]	218,330	[1],[2]
Preferred equity with initial mandatory redemption in November 2017	'		'
Preferred equity investment	'		'
Senior Financing	70,000		'
Debt and preferred equity investments	9,947	[1]	9,940	[1]
Preferred equity redeemed in April 2014	'		'
Preferred equity investment	'		'
Senior Financing	0	[3]	'
Debt and preferred equity investments	$0	[1],[3]	$25,896	[1],[3]
[1]	Carrying value is net of discounts and deferred origination fees.
[2]	The difference between the pay and accrual rates is included as an addition to the principal balance outstanding.
[3]	This preferred equity investment was redeemed in April 2014.

Debt_and_Preferred_Equity_Inve4

Debt and Preferred Equity Investments (Details 3) (USD $)	6 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Loan loss reserve activity	'	'
Balance at beginning of year	$1,000	$7,000
Expensed	0	0
Recoveries	0	0
Charge-offs and reclassifications	-1,000	-6,000
Balance at end of period	$0	$1,000

Debt_and_Preferred_Equity_Inve5

Debt and Preferred Equity Investments (Details 4) (USD $)	6 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
	segment
Investments, Debt and Equity Securities [Abstract]	'	'
Number of portfolio segments of financial receivables (segment)	1	'
Additional amount of financing receivables included in other assets	$134.90	$172.80

Investment_in_Unconsolidated_J2

Investment in Unconsolidated Joint Ventures (Details) (USD $)

3 Months Ended

6 Months Ended

1 Months Ended

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Dec. 31, 2013

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

sqft

sqft

100 Park Avenue

717 Fifth Avenue

800 Third Avenue

1745 Broadway

1 and 2 Jericho Plaza

The Meadows

180/182 Broadway

600 Lexington Avenue

11 West 34th Street

7 Renaissance

3 Columbus Circle

280 Park Avenue

1552-1560 Broadway

1552-1560 Broadway

724 Fifth Avenue

10 East 53rd Street

33 Beekman

521 Fifth Avenue

21 East 66th Street

21 East 66th Street

21 East 66th Street

21 East 66th Street

315 West 36th Street

650 Fifth Avenue

sqft

sqft

sqft

sqft

sqft

sqft

sqft

sqft

sqft

sqft

sqft

sqft

sqft

sqft

sqft

sqft

floor

sqft

sqft

Three retail units

2 residential units

Four residential units

sqft

sqft

sqft

unit

unit

unit

General information on each joint venture

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net equity investment in VIEs in which the entity is not primary beneficiary

$185,200,000

'

$185,200,000

'

$310,700,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Ownership Interest (as a percent)

'

'

'

'

'

49.90%

10.92%

42.95%

32.26%

20.26%

50.00%

25.50%

[1]

55.00%

30.00%

50.00%

48.90%

[2]

50.00%

50.00%

[3]

'

50.00%

55.00%

45.90%

[4]

50.50%

32.28%

[5]

32.28%

'

16.14%

35.50%

50.00%

[6]

Economic Interest (as a percent)

'

'

'

'

'

49.90%

10.92%

42.95%

32.26%

20.26%

50.00%

25.50%

[1]

55.00%

30.00%

50.00%

48.90%

[2]

49.50%

50.00%

[3]

'

50.00%

55.00%

45.90%

[4]

50.50%

32.28%

[5]

'

'

'

35.50%

50.00%

[6]

Area of property (sqft)

33,867,788

'

33,867,788

'

'

834,000

120,000

526,000

674,000

640,000

582,000

71,000

[1]

304,000

17,000

37,000

769,000

[2]

1,237,000

49,000

[3]

13,045

65,000

390,000

145,000

[4]

460,000

17,000

[5]

'

'

'

148,000

32,000

[6]

Acquisition Price

'

'

'

'

'

95,800,000

[7]

251,900,000

[7]

285,000,000

[7]

520,000,000

[7]

210,000,000

[7]

111,500,000

[7]

43,600,000

[1],[7]

193,000,000

[7]

10,800,000

[7]

4,000,000

[7]

500,000,000

[2],[7]

400,000,000

[7]

136,550,000

[3],[7]

'

223,000,000

[7]

252,500,000

[7]

31,000,000

[4],[7]

315,000,000

[7]

75,000,000

[5],[7]

'

'

'

45,000,000

[7]

0

[6],[7]

Aggregate sales price

'

'

'

'

'

'

'

'

'

'

'

222,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Recognized gain (loss) on sale of interest in property

$1,444,000

($3,583,000)

$106,084,000

($3,583,000)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of units in property (units)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

3

2

4

'

'

Number of floors of student housing (floors)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

30

'

'

'

'

'

'

'

[1]

In June 2014, the joint venture entered into a contract to sell the property for $222.5 million. This transaction is expected to close during the third quarter of 2014, subject to satisfaction of customary closing conditions.

[2]

As a result of the sale of a condominium interest in SeptemberB 2012, YoungB & Rubicam,B Inc., or Y&R, owns a portion of the property, generally floors three through eight referred to as Y&R units. Because the joint venture has an option to repurchase the Y&R units, the gain associated with this sale was deferred.

[3]

The purchase price pertained only to the purchase of the 1552 Broadway interest which comprised 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.

[4]

The joint venture owns a fee interest in the property and will develop an approximately 30 story building for student housing. Upon completion of the development, the joint venture will convey a long-term ground lease condominium interest in the building to Pace.

[5]

We hold a 32.28% interest in three retail and two residential units at the property and a 16.14% interest in four residential units at the property.

[6]

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 Sutton 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.

[7]

Acquisition price represents the actual or implied gross purchase price for the joint venture.

Investment_in_Unconsolidated_J3

Investment in Unconsolidated Joint Ventures (Details 2) (USD $)

3 Months Ended

6 Months Ended

6 Months Ended

6 Months Ended

1 Months Ended

6 Months Ended

6 Months Ended

6 Months Ended

6 Months Ended

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Feb. 28, 2014

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Apr. 30, 2014

Jun. 30, 2014

Apr. 30, 2014

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

388 and 390 Greenwich Street

388 and 390 Greenwich Street

Joint Venture

Joint Venture

Joint Venture

Joint Venture

Joint Venture

Joint Venture

Joint Venture

Joint Venture

Joint Venture

Joint Venture

Joint Venture

Joint Venture

Joint Venture

Joint Venture

Joint Venture

Joint Venture

Joint Venture

Joint Venture

Joint Venture

Joint Venture

Joint Venture

Joint Venture

Joint Venture

Joint Venture

Joint Venture

Joint Venture

Joint Venture

Joint Venture

Joint Venture

Joint Venture

Joint Venture

Joint Venture

Joint Venture

Joint Venture

Joint Venture

Joint Venture

Joint Venture

Joint Venture

Joint Venture

Joint Venture

Joint Venture

Joint Venture

Joint Venture

Joint Venture

Joint Venture

Joint Venture

Joint Venture

Joint Venture

Joint Venture

Joint Venture

Joint Venture

Joint Venture

Joint Venture

Joint Venture

Joint Venture

Joint Venture

Joint Venture

Joint Venture

Joint Venture

Joint Venture

Joint Venture

Joint Venture

7 Renaissance

7 Renaissance

11 West 34th Street

11 West 34th Street

280 Park Avenue

280 Park Avenue

1745 Broadway

1745 Broadway

1 and 2 Jericho Plaza

1 and 2 Jericho Plaza

800 Third Avenue

800 Third Avenue

315 West 36th Street

315 West 36th Street

717 Fifth Avenue

717 Fifth Avenue

21 East 66th Street

21 East 66th Street

388 and 390 Greenwich Street

388 and 390 Greenwich Street

100 Park Avenue

100 Park Avenue

100 Park Avenue

21 West 34th Street

21 West 34th Street

1604-1610 Broadway

1604-1610 Broadway

180/182 Broadway

180/182 Broadway

The Meadows

The Meadows

3 Columbus Circle

3 Columbus Circle

1552 Broadway

1552 Broadway

1552 Broadway

1552 Broadway

Other loan payable

Other loan payable

724 Fifth Avenue

724 Fifth Avenue

724 Fifth Avenue

724 Fifth Avenue

724 Fifth Avenue

747 Madison Avenue

747 Madison Avenue

10 East 53rd Street

10 East 53rd Street

33 Beekman

33 Beekman

600 Lexington Avenue

600 Lexington Avenue

521 Fifth Avenue

521 Fifth Avenue

West Coast office portfolio

West Coast office portfolio

Initial Maturity July 2022

Initial Maturity July 2022

Initial Maturity July 2024

Initial Maturity July 2024

Mortgage loan

Mezzanine loans

extension

Mortgage loan

Mezzanine loans

Mortgage loan

Mezzanine loans

Mezzanine loans

717 Fifth Avenue

717 Fifth Avenue

717 Fifth Avenue

717 Fifth Avenue

Mortgages and Other Loans Payable

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Interest rate, fixed rate debt (as a percent)

'

'

'

'

'

3.80%

[1],[2]

'

'

'

10.00%

[1]

'

4.82%

[1]

'

6.57%

[1]

'

5.68%

[1]

'

5.65%

[1]

'

6.00%

[1]

'

3.16%

[1]

'

'

'

3.60%

[1]

'

0.00%

[1],[3]

'

'

0.00%

'

0.00%

'

0.00%

[1],[4]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

4.45%

[1],[5]

'

9.00%

[1],[5]

'

Total fixed rate debt

$4,622,075,000

'

$4,622,075,000

'

$4,130,629,000

$504,000,000

[2]

$0

[2]

$1,892,771,000

$3,223,895,000

$1,461,000

$1,276,000

$17,056,000

$17,205,000

$703,520,000

$706,886,000

$340,000,000

$340,000,000

$163,750,000

$163,750,000

$20,910,000

$20,910,000

$25,000,000

$25,000,000

'

'

$12,000,000

$12,000,000

$0

[3]

$996,082,000

[3]

'

$0

[6]

$209,786,000

[6]

$0

[7]

$100,000,000

[7]

$0

[4]

$27,000,000

[4]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$300,000,000

[5]

$300,000,000

[5]

$309,074,000

[5]

$304,000,000

[5]

Interest rate, floating rate debt (as a percent)

'

'

'

'

'

1.91%

[1],[2]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2.88%

[1]

'

0.00%

[1],[3]

'

'

1.91%

[1],[6]

'

'

'

'

'

2.91%

[1]

'

7.75%

[1]

'

2.33%

[1],[8]

'

4.16%

[1],[9]

'

'

'

1.06%

[1]

'

2.58%

[1],[10]

'

'

'

'

0.00%

[1]

'

2.66%

[1]

'

2.91%

[1],[11]

'

2.23%

[1]

'

2.36%

[1]

'

0.00%

[1],[12]

'

'

'

'

'

Total floating rate debt

1,508,351,000

'

1,508,351,000

'

729,949,000

946,000,000

[2]

0

[2]

1,682,685,000

1,842,815,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1,921,000

1,959,000

0

[3]

142,297,000

[3]

'

360,000,000

[6]

0

[6]

'

'

'

'

89,551,000

89,893,000

67,350,000

67,350,000

235,129,000

[8]

239,233,000

[8]

175,904,000

[9]

158,690,000

[9]

'

'

30,000,000

30,000,000

275,000,000

[10]

120,000,000

[10]

'

'

'

0

33,125,000

125,000,000

125,000,000

34,141,000

[11]

18,362,000

[11]

118,689,000

120,616,000

170,000,000

170,000,000

0

[12]

526,290,000

[12]

'

'

'

'

Mortgages and other loans payable

6,130,426,000

'

6,130,426,000

'

4,860,578,000

'

'

3,575,456,000

5,066,710,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Maximum amount of loan recourse to entity

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

75,000,000

'

'

'

'

'

'

'

'

'

'

'

Face amount of loan

'

'

'

'

'

1,500,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

360,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

235,000,000

'

40,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Term of refinanced mortgage

'

'

'

'

'

'7 years

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'7 years

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Loss on early extinguishment of debt

1,028,000

10,000

1,025,000

18,523,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2,400,000

'

3,200,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1,200,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Incentive income

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

7,700,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Possible increase in mortgage based on meeting certain performance hurdles

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

40,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Committed amount

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

300,000,000

290,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

150,000,000

41,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of extension options (extensions)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Period of extension option for mortgage secured by the portfolio

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'1 year

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Unfunded amount

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$8,400,000

$7,200,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

[1]

Effective weighted average interest rate for the three months ended June 30, 2014, taking into account interest rate hedges in effect during the period.

[2]

Simultaneous with the acquisition of our joint venture partner interest, we refinanced the $1.1 billion floating rate mortgage with a $1.5 billion seven-year floating rate mortgage, and have consolidated the property.

[3]

In May 2014, we acquired the interest of our joint venture thereby consolidating the entity. Simultaneous with the acquisition, we refinanced the mortgage and realized a net loss on early extinguishment of debt of $2.4 million.

[4]

This loan was in default since NovemberB 2009 due to the non-payment of debt service. In January 2014, the joint venture relinquished its ground lease position to the lender. During the six months ended June 30, 2014, we also recognized $7.7 million of incentive income, which is included in other income on the consolidated statements of income.

[5]

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.

[6]

In February 2014, the joint venture replaced the previous fixed rate mortgage with a $360.0 million, seven-year floating rate, mortgage and realized a net loss on early extinguishment of $3.2 million.

[7]

In January 2014, we sold our interest in the joint venture, inclusive of our share of the joint venture debt.

[8]

The joint venture has the ability to increase the mortgage by $40.0 million based on meeting certain performance hurdles. In connection with this obligation, we executed a master lease agreement and our joint venture partner executed a contribution agreement to reflect its pro rata obligation under the master lease. The lien on the mortgage and the master lease excludes the condominium interest owned by Y&R. See Note 3 of prior table.

[9]

These loans are comprised of a $150.0 million mortgage loan and a $41.5 million mezzanine loan and are subject to two one-year extension options. As of JuneB 30, 2014, $8.4 million of the mortgage loan and $7.2 million of the mezzanine loan remained unfunded.

[10]

In April 2014, the joint venture refinanced the previous mortgage with a $235.0 million mortgage and a $40.0 million mezzanine loan and realized a net loss on early extinguishment of debt of $1.2 million. These new floating rate loans mature in April 2017.

[11]

This loan has a committed amount of $75.0 million, which 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.

[12]

In March 2014, we sold our interest in the joint venture, inclusive of our share in the joint venture debt.

Investment_in_Unconsolidated_J4

Investment in Unconsolidated Joint Ventures (Details 3) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Assets	'	'	'	'	'
Commercial real estate property, net	$11,957,923	'	$11,957,923	'	$10,687,540
Other assets	679,840	'	679,840	'	750,123
Liabilities and members' equity	'	'	'	'	'
Mortgages and other loans payable	6,130,426	'	6,130,426	'	4,860,578
Company's investments in unconsolidated joint ventures	971,926	'	971,926	'	1,113,218
Combined statements of income for the unconsolidated joint ventures	'	'	'	'	'
Operating expenses	70,675	68,611	144,160	139,780	'
Ground rent	8,040	7,930	16,073	16,058	'
Real estate taxes	53,267	51,749	108,583	104,203	'
Interest expense, net of interest income	78,611	79,551	156,330	157,860	'
Amortization of deferred financing costs	5,500	4,229	9,357	8,681	'
Transaction related costs, net of recoveries	1,697	1,706	4,171	3,085	'
Depreciation and amortization	94,838	81,577	184,217	160,200	'
Total expenses	336,500	316,867	670,019	632,449	'
Company's equity in net income (loss) from unconsolidated joint ventures	8,619	-3,761	14,748	1,313	'
Joint Venture	'	'	'	'	'
Assets	'	'	'	'	'
Commercial real estate property, net	4,925,422	'	4,925,422	'	6,846,021
Other assets	749,571	'	749,571	'	827,282
Total assets	5,674,993	'	5,674,993	'	7,673,303
Liabilities and members' equity	'	'	'	'	'
Mortgages and other loans payable	3,575,456	'	3,575,456	'	5,066,710
Other liabilities	485,753	'	485,753	'	596,960
Members' equity	1,613,784	'	1,613,784	'	2,009,633
Total liabilities and members' equity	5,674,993	'	5,674,993	'	7,673,303
Company's investments in unconsolidated joint ventures	971,926	'	971,926	'	1,113,218
Combined statements of income for the unconsolidated joint ventures	'	'	'	'	'
Total revenues	130,495	154,974	291,633	306,205	'
Operating expenses	18,362	28,205	45,045	56,816	'
Ground rent	2,632	658	4,657	1,315	'
Real estate taxes	15,406	16,958	32,342	34,263	'
Interest expense, net of interest income	44,728	56,561	97,064	112,968	'
Amortization of deferred financing costs	2,026	5,302	6,659	9,585	'
Transaction related costs, net of recoveries	-207	0	64	0	'
Depreciation and amortization	33,858	52,539	79,462	95,150	'
Total expenses	116,805	160,223	265,293	310,097	'
Loss on early extinguishment of debt	-3,546	0	-6,743	0	'
Net income (loss) before gain on sale	10,144	-5,249	19,597	-3,892	'
Company's equity in net income (loss) from unconsolidated joint ventures	$8,619	($3,761)	$14,748	$1,313	'

Investment_in_Unconsolidated_J5

Investment in Unconsolidated Joint Ventures Investment in Unconsolidated Joint Ventures-Additional Information (Details) (USD $)

3 Months Ended

6 Months Ended

3 Months Ended

6 Months Ended

0 Months Ended

1 Months Ended

1 Months Ended

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Dec. 31, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Dec. 31, 2013

31-May-14

31-May-14

Jun. 30, 2014

31-May-14

Mar. 31, 2014

Mar. 31, 2014

Jan. 31, 2014

Jan. 31, 2014

Mar. 31, 2014

sqft

sqft

Joint Venture

Joint Venture

Joint Venture

Joint Venture

Joint Venture

747 Madison Avenue

747 Madison Avenue

747 Madison Avenue

747 Madison Avenue

West Coast office portfolio

West Coast office portfolio

21 West 34th Street

21 West 34th Street

Participating Financing Due March 2016

unit

Joint Venture

Joint Venture

Joint Venture

sqft

Joint Venture

Investment in Unconsolidated Joint Ventures

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of units in property (units)

'

'

'

'

'

'

'

'

'

'

'

5

'

'

'

'

'

'

'

Real Estate fair value

'

'

'

'

'

'

'

'

'

'

'

$160,000,000

'

'

$756,000,000

'

$114,900,000

'

'

Total floating rate debt

1,508,351,000

'

1,508,351,000

'

729,949,000

1,682,685,000

'

1,682,685,000

'

1,842,815,000

'

'

'

33,100,000

'

526,300,000

'

100,000,000

'

Ownership Interest (as a percent)

'

'

'

'

'

'

'

'

'

'

'

'

100.00%

'

'

'

'

'

'

Joint venture ownership percentage sold (percent)

'

'

'

'

'

'

'

'

'

'

33.33%

'

'

'

43.74%

'

49.90%

'

'

Promote income

'

'

'

'

'

'

'

'

'

'

10,300,000

'

'

'

'

'

'

'

'

Preferred equity investment

'

'

'

'

'

'

'

'

'

'

'

30,000,000

'

'

'

'

'

'

'

Deferred gain on sale

'

'

'

'

'

'

'

'

'

'

13,100,000

'

'

'

'

'

'

'

'

Equity in net gain (loss) on sale of interest in unconsolidated joint venture/real estate

1,444,000

-3,583,000

106,084,000

-3,583,000

'

'

'

'

'

'

'

'

'

'

85,500,000

'

20,900,000

'

'

Loans Receivable, Gross, Commercial, Acquisition

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

100,000,000

Loans and Leases Receivable, Gross

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

60,000,000

Debt and preferred equity investments

1,547,808,000

'

1,547,808,000

'

1,304,839,000

'

'

'

'

'

'

'

'

'

'

'

'

'

40,000,000

Management fees, base revenue

'

'

'

'

'

$4,800,000

$1,400,000

$11,200,000

$4,000,000

'

'

'

'

'

'

'

'

'

'

Area of property (sqft)

33,867,788

'

33,867,788

'

'

'

'

'

'

'

'

'

'

'

'

'

91,311

'

'

Deferred_Costs_Details

Deferred Costs (Details) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Deferred Costs [Abstract]	'	'
Deferred leasing	$331,716	$326,379
Deferred financing	201,148	157,088
Deferred costs, gross	532,864	483,467
Less accumulated amortization	-232,821	-216,409
Deferred costs, net	$300,043	$267,058

Mortgages_and_Other_Loans_Paya2

Mortgages and Other Loans Payable (Details) (USD $)

3 Months Ended

6 Months Ended

6 Months Ended

6 Months Ended

6 Months Ended

1 Months Ended

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Apr. 30, 2014

Jun. 30, 2014

Dec. 31, 2013

Series J Preferred Units

Series J Preferred Units

Master repurchase agreement

Master repurchase agreement

125 Park Avenue

125 Park Avenue

711 Third Avenue

711 Third Avenue

625 Madison Avenue

625 Madison Avenue

500 West Putnam Avenue

500 West Putnam Avenue

420 Lexington Avenue

420 Lexington Avenue

Landmark Square

Landmark Square

485 Lexington Avenue

485 Lexington Avenue

120 West 45th Street

120 West 45th Street

762 Madison Avenue

762 Madison Avenue

2 Herald Square

2 Herald Square

885 Third Avenue

885 Third Avenue

388 and 390 Greenwich Street

388 and 390 Greenwich Street

Other loan payable

Other loan payable

One Madison Avenue

One Madison Avenue

100 Church

100 Church

919 Third Avenue

919 Third Avenue

400 East 57th Street

400 East 57th Street

400 East 58th Street

400 East 58th Street

1515 Broadway

1515 Broadway

609 Partners, LLC

609 Partners, LLC

609 Partners, LLC

Master repurchase agreement

180 Maiden Lane

180 Maiden Lane

248-252 Bedford Avenue

248-252 Bedford Avenue

220 East 42nd Street

220 East 42nd Street

16 Court Street

16 Court Street

16 Court Street

Series E preferred units

Mortgages and Other Loans Payable

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Interest rate, fixed rate debt (as a percent)

'

'

'

'

'

3.75%

[1],[2]

'

'

'

5.75%

[1]

'

4.99%

[1]

'

7.27%

[1]

'

5.52%

[1]

'

7.15%

[1]

'

4.00%

[1]

'

5.61%

[1]

'

6.12%

[1]

'

3.75%

[1]

'

5.36%

[1],[3]

'

6.26%

[1]

'

3.80%

[1],[4]

'

8.00%

[1],[5]

'

5.91%

[1]

'

4.68%

[1]

'

5.12%

[1],[6]

'

4.13%

[1]

'

4.13%

[1]

'

3.93%

[1]

'

0.00%

[1],[7]

'

'

'

'

'

'

'

'

'

'

'

'

Total fixed rate debt

$4,622,075,000

'

$4,622,075,000

'

$4,130,629,000

$4,000,000

[2]

$0

[2]

'

'

$146,250,000

$146,250,000

$120,000,000

$120,000,000

$117,892,000

$120,830,000

$23,253,000

$23,529,000

$181,612,000

$182,641,000

$82,097,000

$82,909,000

$450,000,000

$450,000,000

$170,000,000

$170,000,000

$8,128,000

$8,211,000

$191,250,000

[3]

$191,250,000

[3]

$267,650,000

$267,650,000

$504,000,000

[4]

$0

[4]

$50,000,000

[5]

$50,000,000

[5]

$576,653,000

$587,336,000

$230,000,000

$230,000,000

$500,000,000

[6]

$500,000,000

[6]

$69,503,000

$70,000,000

$29,787,000

$30,000,000

$900,000,000

$900,000,000

$0

[7]

$23,000

[7]

'

'

'

'

'

'

'

'

'

'

'

Interest rate, floating rate debt (as a percent)

'

'

'

'

'

'

'

3.37%

[1],[8]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1.91%

[1],[4]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2.34%

[1],[9]

'

2.16%

[1],[10]

'

1.76%

[1]

'

'

'

'

Total floating rate debt

1,508,351,000

'

1,508,351,000

'

729,949,000

'

'

0

[8]

91,000,000

[8]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

946,000,000

[4]

0

[4]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

258,351,000

[9]

262,706,000

[9]

29,000,000

[10]

22,000,000

[10]

275,000,000

275,000,000

'

0

[11]

79,243,000

[11]

Mortgages and other loans payable

6,130,426,000

'

6,130,426,000

'

4,860,578,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Liabilities related to assets held for sale

193,375,000

'

193,375,000

'

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

191,300,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt refinanced

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1,100,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Face amount of loan

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1,500,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

29,000,000

'

'

'

'

'

'

Term

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'7 years

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'5 years

'

'

'

'

'

'

Interest in property (as a percent)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

51.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Limited partner interests in Operating Partnership, limited partner common units outstanding (shares)

'

'

'

'

'

4,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Dividend rate preferred units (as a percent)

'

'

'

'

'

3.75%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Preferred stock, liquidation preference (in dollars per share)

'

'

'

'

'

$1,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Preferred Units, shares outstanding (shares)

'

'

'

'

'

4,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

22,658

'

'

'

'

'

'

'

'

'

'

Maximum borrowing capacity

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

300,000,000

'

'

'

'

'

'

'

'

'

Loss on early extinguishment of debt

1,028,000

10,000

1,025,000

18,523,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

500,000

'

'

'

500,000

'

'

Gross book value of the properties and debt and preferred equity investments collateralizing the mortgages and other loans payable

$9,500,000,000

'

$9,500,000,000

'

$8,000,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

[1]

Effective weighted average interest rate for the three months ended June 30, 2014, taking into account interest rate hedges in effect during the period.

[2]

In connection with the subsequent acquisition of a commercial real estate property, the Operating Partnership issued $4.0 million or 4,000 3.75% Series J Preferred Units of limited partnership interest, of the Series J Preferred Units, with a mandatory liquidation preference of $1,000.00 per unit. The Series J Preferred Units can be redeemed in cash by the Operating Partnership on the earlier of (i) the date of the sale of the property or (ii) April 30, 2051 or at the option of the unitholders as further prescribed in the related agreement.

[3]

This property is held for sale at June 30, 2014 and the related $191.3 million mortgage is included in liabilities related to assets held for sale.

[4]

Simultaneous with the acquisition of our joint venture partner interest, we refinanced the $1.1 billion floating rate mortgage with a $1.5 billion seven-year floating rate mortgage, and have consolidated the property.

[5]

This loan is secured by a portion of a preferred equity investment.

[6]

We own a 51.0% controlling interest in the joint venture that is the borrower on this loan.

[7]

In April 2014, the remaining 22,658 Series E Preferred Units of the Operating Partnership were canceled.

[8]

The Master Repurchase Agreement, or MRA, has a maximum facility capacity of $300.0 million.

[9]

In connection with this consolidated joint venture obligation, we executed a master lease agreement. Our partner has executed a contribution agreement to reflect its pro rata share of the obligation under the master lease

[10]

In June 2014, we replaced the previous floating rate mortgage with a $29.0 million, five-year floating rate mortgage and incurred a net loss on early extinguishment of debt of $0.5 million.

[11]

In April 2014, we repaid the loan and incurred a loss on early extinguishment of debt of $0.5 million.

Corporate_Indebtedness_Details

Corporate Indebtedness (Details) (USD $)

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Nov. 30, 2012

Nov. 30, 2012

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2005

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

2012 Credit Facility

2012 Credit Facility

Revolving credit facility

Revolving credit facility

Revolving credit facility

Revolving credit facility

Term loan

Trust Preferred Securities

Trust Preferred Securities

LIBOR

LIBOR

LIBOR

LIBOR

LIBOR

LIBOR

LIBOR

extension

Maximum

Minimum

Revolving credit facility

Revolving credit facility

Revolving credit facility

Term loan

Term loan

Term loan

Trust Preferred Securities

Maximum

Minimum

Maximum

Minimum

Mortgages and Other Loans Payable

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Face amount of loan

'

'

'

$1,600,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Increase in maximum borrowing capacity

'

'

'

'

'

'

'

'

383,000,000

'

'

'

'

'

'

'

'

'

Maximum borrowing capacity

'

'

'

'

1,200,000,000

'

'

'

783,000,000

'

'

'

'

'

'

'

'

'

Decrease in basis spread on variable rate (percent)

'

'

'

'

'

0.25%

'

'

'

'

'

'

'

'

'

'

'

'

Number of extension options (extensions)

'

'

'

'

2

'

'

'

'

'

'

'

'

'

'

'

'

'

Extension option available

'

'

'

'

'6 months

'

'

'

'

'

'

'

'

'

'

'

'

'

Extension fee (percent)

'

'

'

'

'

0.10%

'

'

'

'

'

'

'

'

'

'

'

'

Maximum borrowing capacity, optional expansion

'

'

'

'

1,500,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Effective Rate (as a percent)

'

'

'

'

'

1.61%

'

'

1.64%

'

'

'

'

'

'

'

'

'

Interest rate added to base rate (as a percent)

'

'

'

'

'

'

'

'

'

'

'

1.45%

1.75%

1.00%

1.40%

1.90%

0.95%

1.25%

Fee on the unused balance, payable quarterly in arrears (as a percent)

'

'

'

'

'

'

0.35%

0.15%

'

'

'

'

'

'

'

'

'

'

Facility fee on total commitments, payable quarterly in arrears (as a percent)

'

'

'

'

'

'

'

0.30%

'

'

'

'

'

'

'

'

'

'

Letters of credit

'

'

116,300,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Outstanding under line of credit facility

0

220,000,000

'

'

'

'

'

'

783,000,000

'

'

'

'

'

'

'

'

'

Ability to borrow under line of credit facility

'

'

1,100,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt origination and legal costs

'

'

2,800,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt instrument issued, value

'

'

'

'

'

'

'

'

'

$100,000,000

'

'

'

'

'

'

'

'

Coupon Rate (as a percent)

'

'

'

'

'

'

'

'

'

'

5.61%

'

'

'

'

'

'

'

Number of years for which securities will bear fixed rate of interest

'

'

'

'

'

'

'

'

'

'10 years

'

'

'

'

'

'

'

'

Corporate_Indebtedness_Details1

Corporate Indebtedness (Details 2) (USD $)

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Oct. 31, 2010

Jun. 30, 2013

Jun. 30, 2014

Mar. 31, 2007

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

3.00% Senior unsecured notes maturing on October 15, 2017

3.00% Senior unsecured notes maturing on October 15, 2017

4.0% exchangeable senior debentures due 2025

4.0% exchangeable senior debentures due 2025

3.0% exchangeable senior debentures due 2027

Senior Unsecured Notes

Senior Unsecured Notes

Senior Unsecured Notes

Senior Unsecured Notes

Senior Unsecured Notes

Senior Unsecured Notes

Senior Unsecured Notes

Senior Unsecured Notes

Senior Unsecured Notes

Senior Unsecured Notes

Senior Unsecured Notes

Senior Unsecured Notes

Senior Unsecured Notes

Senior Unsecured Notes

Senior Unsecured Notes

Senior Unsecured Notes

Senior Unsecured Notes

Senior Unsecured Notes

5.88% Senior unsecured notes maturing on August 15, 2014

5.88% Senior unsecured notes maturing on August 15, 2014

6.00% Senior unsecured notes maturing on March 31, 2016

6.00% Senior unsecured notes maturing on March 31, 2016

3.00% Senior unsecured notes maturing on October 15, 2017

3.00% Senior unsecured notes maturing on October 15, 2017

5.00% senior unsecured notes maturing on August 15, 2018

5.00% senior unsecured notes maturing on August 15, 2018

7.75% Senior unsecured notes maturing on March 15, 2020

7.75% Senior unsecured notes maturing on March 15, 2020

4.50% senior unsecured notes maturing on December 1, 2022

4.50% senior unsecured notes maturing on December 1, 2022

4.0% exchangeable senior debentures due 2025

4.0% exchangeable senior debentures due 2025

3.0% exchangeable senior debentures due 2027

3.0% exchangeable senior debentures due 2027

Mortgages and Other Loans Payable

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Unpaid Principal Balance

'

'

'

'

'

'

'

$1,386,221,000

'

$75,898,000

[1]

'

$255,308,000

[1]

'

$345,000,000

[2]

'

$250,000,000

[3]

'

$250,000,000

[3]

'

$200,000,000

[3]

'

$7,000

[1],[4]

'

$10,008,000

[5]

'

Accreted Balance

2,127,206,000

1,739,330,000

'

'

'

'

'

1,344,206,000

1,339,330,000

75,898,000

[1]

75,898,000

[1]

255,227,000

[1]

255,206,000

[1]

303,354,000

[2]

297,837,000

[2]

249,712,000

[3]

249,681,000

[3]

250,000,000

[3]

250,000,000

[3]

200,000,000

[3]

200,000,000

[3]

7,000

[1],[4]

7,000

[1],[4]

10,008,000

[5]

10,701,000

[5]

Interest rate (as a percent)

'

'

'

'

'

'

'

'

'

5.88%

[1],[6]

'

6.00%

[1],[6]

'

3.00%

[2],[6]

'

5.00%

[3],[6]

'

7.75%

[3],[6]

'

4.50%

[3],[6]

'

4.00%

[1],[4],[6]

'

3.00%

[5],[6]

'

Effective Rate (as a percent)

'

'

'

'

'

'

'

'

'

5.88%

[1]

'

6.00%

[1]

'

3.00%

[2]

'

5.00%

[3]

'

7.75%

[3]

'

4.50%

[3]

'

4.00%

[1],[4]

'

3.00%

[5]

'

Term

'

'

'

'

'

'

'

'

'

'10 years

[1]

'

'10 years

[1]

'

'7 years

[2]

'

'7 years

[3]

'

'10 years

[3]

'

'10 years

[3]

'

'20 years

[1],[4]

'

'20 years

[5]

'

Premium on sale price to calculate exchange price of notes (as a percent)

'

'

'

30.00%

'

'

25.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Exchange price (in dollars per share)

'

'

'

$85.81

'

$1.35

$173.30

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Adjusted exchange rate for the debentures (in shares)

'

'

11.7153

'

7.7461

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Amount of convertible debt recorded in equity

'

'

'

78,300,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt Instrument, Unamortized Discount

'

'

$41,600,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

[1]

Issued by ROP.

[2]

Issued by the Operating Partnership. Interest on these exchangeable notes is payable semi-annually on AprilB 15 and OctoberB 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 OctoberB 6, 2010, or $85.81. The initial exchange rate is subject to adjustment under certain circumstances. The current exchange rate is 11.7153 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 guaranteed by ROP. On the issuance date, $78.3 million of the debt balance was recorded in equity. As of JuneB 30, 2014, $41.6 million remained to be amortized into the debt balance.

[3]

Issued by the Company, the Operating Partnership and ROP, as co-obligors.

[4]

Exchangeable senior debentures which are currently callable at par. In addition, the debentures can be put to ROP, at the option of the holder at par plus accrued and unpaid interest, on JuneB 15, 2015 and 2020 and upon the occurrence of certain change of control transactions. As a result of the acquisition of all outstanding shares of common stock of Reckson, or the Reckson Merger, the adjusted exchange rate for the debentures is 7.7461 shares of SL Green's common stock per $1,000 of principal amount of debentures and the adjusted reference dividend for the debentures is $1.3491.

[5]

Issued by the Operating Partnership. Interest on these remaining exchangeable notes is payable semi-annually on MarchB 30 and SeptemberB 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 MarchB 20, 2007, or $173.30. The initial exchange rate is subject to adjustment under certain circumstances. 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 Partnershipbs option. The Operating Partnership may be required to repurchase the notes on MarchB 30, 2017 and 2022, and upon the occurrence of certain designated events.

[6]

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

Corporate_Indebtedness_Details2

Corporate Indebtedness (Details 3) (USD $)	Jun. 30, 2014
In Thousands, unless otherwise specified
Amortization and Maturities of Long-term Debt [Abstract]	'
Remaining 2014	$245,311
2015	277,024
2016	825,565
2017	1,502,650
2018	314,462
Thereafter	5,234,635
Total amortization of debt and principal repayments	8,399,647
Mortgages and other loans payable	'
Scheduled Amortization	'
Remaining 2014	23,163
2015	47,480
2016	55,946
2017	61,063
2018	64,462
Thereafter	246,979
Total amortization of debt	499,093
Principal Repayments	'
Remaining 2014	146,250
2015	229,537
2016	514,311
2017	1,086,579	[1]
2018	0
Thereafter	3,654,656
Total principal repayments	5,631,333	[1]
Trust Preferred Securities	'
Amortization and Maturities of Long-term Debt [Abstract]	'
Thereafter	100,000
Total amortization of debt and principal repayments	100,000
Term Loan and Senior Unsecured Notes	'
Amortization and Maturities of Long-term Debt [Abstract]	'
Remaining 2014	75,898
2015	7
2016	255,308
2017	355,008
2018	250,000
Thereafter	1,233,000
Total amortization of debt and principal repayments	2,169,221
Joint Venture	'
Amortization and Maturities of Long-term Debt [Abstract]	'
Remaining 2014	27,651
2015	44,260
2016	561,736
2017	442,584
2018	28
Thereafter	353,580
Total amortization of debt and principal repayments	$1,429,839
[1]	Principal repayments include the mortgage at 2 Herald Center, which is included in liabilities related to assets held for sale.

Corporate_Indebtedness_Details3

Corporate Indebtedness (Details 4) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Debt Disclosure [Abstract]	'	'	'	'
Interest expense	$79,163	$80,009	$157,414	$158,758
Interest income	-552	-458	-1,084	-898
Interest expense, net	78,611	79,551	156,330	157,860
Interest capitalized	$6,862	$3,301	$11,003	$6,363

Related_Party_Transactions_Det

Related Party Transactions (Details) (USD $)

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Alliance Building Services

Alliance Building Services

Alliance Building Services

Alliance Building Services

A-List Marketing, LLC

A-List Marketing, LLC

A-List Marketing, LLC

A-List Marketing, LLC

Nancy Peck and Company

Entity with Stephen L Green ownership interest

Entity with Stephen L Green ownership interest

Entity with Stephen L Green ownership interest

Entity with Stephen L Green ownership interest

sqft

Related Party Transactions

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Profit participation from related party

'

'

$1,000,000

$900,000

$1,900,000

$1,900,000

'

'

'

'

'

'

'

'

'

Related party expenses

'

'

4,700,000

4,300,000

8,200,000

8,400,000

77,100

104,900

94,900

107,300

'

'

'

'

'

Space at 420 Lexington Avenue leased (sqft)

'

'

'

'

'

'

'

'

'

'

1,003

'

'

'

'

Lease rent due per year

'

'

'

'

'

'

'

'

'

'

35,516

'

'

'

'

Increased lease rent due per year beginning in year seven

'

'

'

'

'

'

'

'

'

'

40,000

'

'

'

'

Property management fees from related party

'

'

'

'

'

'

'

'

'

'

'

111,600

95,500

216,400

213,700

Amounts due from/to related parties

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Due from joint ventures

1,484,000

2,376,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Other

7,431,000

6,154,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Related party receivables

$8,915,000

$8,530,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Noncontrolling_Interests_on_th2

Noncontrolling Interests on the Company's Consolidated Financial Statements (Details) (USD $)	3 Months Ended		6 Months Ended			12 Months Ended	1 Months Ended
In Thousands, except Share data, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Dec. 31, 2013	Jan. 31, 2012	Nov. 30, 2011	Nov. 30, 2011
					SL Green Operating Partnership	SL Green Operating Partnership	SL Green Operating Partnership	SL Green Operating Partnership	SL Green Operating Partnership
							Series G Preferred Units	Series H Preferred Units	Series F Preferred Units
Organization	'	'	'	'	'	'	'	'	'
Noncontrolling interest in the operating partnership (as a percent)	'	'	'	'	3.53%	2.96%	'	'	'
Number of units of operating partnership owned by the noncontrolling interest unit holders (shares)	'	'	'	'	3,500,060	2,902,317	'	'	'
Shares of common stock reserved for issuance upon redemption of units of limited partnership interest in operating partnership (shares)	'	'	'	'	3,500,060	'	'	'	'
Number of preferred units issued (in shares)	'	'	'	'	'	'	1,902,000	80,000	60
Dividend rate preferred units (as a percent)	'	'	'	'	'	'	4.50%	6.00%	'
Liquidation preference of preferred units (in dollars per share)	'	'	'	'	'	'	$25	$25	$1,000
Annual dividends on preferred units (in dollars per share)	'	'	'	'	'	'	$1.13	$1.50	'
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	'	'
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership	'	'	'	'	'	'	'	'	'
Balance at beginning of period	'	'	$265,476	'	$265,476	$212,907	'	'	'
Distributions	'	'	-4,352	'	-3,598	-4,146	'	'	'
Issuance of common units	'	'	1,673	'	19,460	24,750	'	'	'
Redemption of common units	'	'	'	'	-23,066	-17,287	'	'	'
Net income	8,645	244	13,374	799	13,374	3,023	'	'	'
Accumulated other comprehensive income allocation	276	456	234	515	234	611	'	'	'
Fair value adjustment	'	'	'	'	107,925	45,618	'	'	'
Balance at end of period	$379,805	'	$379,805	'	$379,805	$265,476	'	'	'

Stockholders_Equity_of_the_Com2

Stockholders' Equity of the Company (Details) (USD $)	Jun. 30, 2014	Dec. 31, 2013
Stockholders' Equity Note [Abstract]	'	'
Authorized capital stock (in shares)	260,000,000	'
Authorized shares, par value (in dollars per share)	$0.01	'
Common stock, shares authorized (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)	95,587,301	'
Excess stock shares issued (shares)	0	'

Stockholders_Equity_of_the_Com3

Stockholders' Equity of the Company (Details 2) (USD $)	6 Months Ended		6 Months Ended		1 Months Ended	6 Months Ended		6 Months Ended
	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2014	Jul. 31, 2011	Jun. 30, 2014	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2014	Jun. 30, 2012
			At-the-market equity offering programs	At-the-market equity offering programs	New at-the-market equity offering program	Series I Preferred Stock	Series I Preferred Stock	Dividend Reinvestment and Stock Purchase Plan (DRIP)	Dividend Reinvestment and Stock Purchase Plan (DRIP)
Stockholders' Equity	'	'	'	'	'	'	'	'	'
Aggregate value of the shares of common stock to be sold	'	'	'	$250,000,000	$300,000,000	'	'	'	'
Issuance of common stock (shares)	'	'	25,659	'	55,765	'	'	272	'
Proceeds from shares sold	'	'	2,800,000	'	6,100,000	'	'	'	'
Aggregate value of shares available for issuance	'	'	'	'	293,800,000	'	'	'	'
Preferred stock, shares outstanding (shares)	'	'	'	'	'	9,200,000	9,200,000	'	'
Dividend rate Perpetual 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)	'	'	'	'	'	$1.63	'	'	'
Common stock, shares authorized (shares)	160,000,000	160,000,000	'	'	'	'	'	'	3,500,000
DRIP proceeds	$26,000	'	'	'	'	'	'	$26,000	'

Stockholders_Equity_of_the_Com4

Stockholders' Equity of the Company (Details 3) (USD $)	3 Months Ended		6 Months Ended
In Thousands, except Share data, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Basic Earnings:	'	'	'	'
Income attributable to SL Green common stockholders	$235,541	$8,276	$381,631	$27,185
Diluted Earnings:	'	'	'	'
Income attributable to SL Green common stockholders	244,186	8,520	395,005	27,984
Basic Shares:	'	'	'	'
Basic weighted average common shares outstanding (in shares)	95,455,000	91,660,000	95,288,000	91,530,000
Effect of Dilutive Securities:	'	'	'	'
Stock-based compensation plans (in shares)	514,000	224,000	501,000	228,000
Diluted weighted average common stock outstanding (shares)	99,484,000	94,536,000	99,128,000	94,452,000
Common stock shares excluded from the diluted shares outstanding	748,000	894,000	797,000	939,000
Common Stock	'	'	'	'
Effect of Dilutive Securities:	'	'	'	'
Redemption of units to common shares	$8,645	$244	$13,374	$799
Effect of Dilutive Securities:	'	'	'	'
Redemption of units to common shares (shares)	3,515,000	2,652,000	3,339,000	2,694,000

Partners_Capital_of_the_Operat2

Partners' Capital of the Operating Partnership (Details)	Jun. 30, 2014	Dec. 31, 2013
Common Stock	'	'
Stockholders' Equity	'	'
Shares outstanding (shares)	95,587,000	94,993,000
SL Green Operating Partnership	'	'
Stockholders' Equity	'	'
Noncontrolling interest in the operating partnership (as a percent)	3.53%	2.96%
Number of units of operating partnership owned by the noncontrolling interest unit holders (shares)	3,500,060	2,902,317
SL Green Operating Partnership | Common Stock	'	'
Stockholders' Equity	'	'
Shares outstanding (shares)	95,587,301	'
Series I Preferred Units | SL Green Operating Partnership	'	'
Stockholders' Equity	'	'
Shares outstanding (shares)	9,200,000	'

Partners_Capital_of_the_Operat3

Partners' Capital of the Operating Partnership-EPS (Details) (USD $)	3 Months Ended		6 Months Ended
In Thousands, except Share data, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Stockholders' Equity	'	'	'	'
Net income basic	$235,541	$8,276	$381,631	$27,185
Net income diluted	244,186	8,520	395,005	27,984
Basic weighted average common shares outstanding (in shares)	95,455,000	91,660,000	95,288,000	91,530,000
Common stock shares excluded from the diluted shares outstanding	748,000	894,000	797,000	939,000
SL Green Operating Partnership	'	'	'	'
Stockholders' Equity	'	'	'	'
Net income basic	244,186	8,520	395,005	27,984
Net income diluted	$244,186	$8,520	$395,005	$27,984
Basic weighted average common shares outstanding (in shares)	98,970,000	94,312,000	98,627,000	94,224,000
Stock-based compensation plans (shares)	514,000	224,000	501,000	228,000
Diluted weighted average common units outstanding (shares)	99,484,000	94,536,000	99,128,000	94,452,000
Common stock shares excluded from the diluted shares outstanding	748,000	894,000	797,000	939,000

Sharebased_Compensation_Detail

Share-based Compensation (Details) (USD $)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Restricted Stock Awards	'	'	'	'	'
Options Outstanding	'	'	'	'	'
Weighted average fair value of options granted during the period	'	'	$0	'	$17,386,949
Summary of restricted stock	'	'	'	'	'
Balance at beginning of year (in shares)	'	'	2,994,197	2,804,901	2,804,901
Granted (in shares)	'	'	0	'	192,563
Cancelled (in shares)	'	'	-1,434	'	-3,267
Balance at end of period (in shares)	2,992,763	'	2,992,763	'	2,994,197
Vested during the period (in shares)	'	'	69,293	'	21,074
Compensation expense recorded	'	'	4,678,269	'	6,713,155
Weighted average fair value of restricted stock granted during the period	'	'	0	'	17,386,949
Stock options	'	'	'	'	'
Fair Value Assumptions	'	'	'	'	'
Dividend yield (as a percent)	'	'	1.80%	'	1.92%
Expected life of option	'	'	'3 years 8 months 12 days	'	'4 years 1 month 6 days
Risk-free interest rate (as a percent)	'	'	0.94%	'	0.96%
Expected stock price volatility (as a percent)	'	'	35.00%	'	36.12%
Options Outstanding	'	'	'	'	'
Balance at beginning of year (in shares)	'	'	1,765,034	1,201,000	1,201,000
Granted (in shares)	'	'	3,000	'	828,100
Exercised (in shares)	'	'	-277,145	'	-223,531
Lapsed or cancelled (in shares)	'	'	-26,984	'	-40,535
Balance at end of period (in shares)	1,463,905	'	1,463,905	'	1,765,034
Options exercisable at end of period (in shares)	456,464	'	456,464	'	461,458
Weighted average fair value of options granted during the period	'	'	69,805	'	18,041,576
Weighted Average Exercise Price	'	'	'	'	'
Balance at beginning of year (in dollars per share)	'	'	$83.24	$75.05	$75.05
Granted (in dollars per share)	'	'	$98.58	'	$87.23
Exercised (in dollars per share)	'	'	$71.27	'	$53.93
Lapsed or cancelled (in dollars per share)	'	'	$83.81	'	$83.94
Balance at end of period (in dollars per share)	$85.53	'	$85.53	'	$83.24
Options exercisable at end of period (in dollars per share)	$88.98	'	$88.98	'	$89.38
Summary of restricted stock	'	'	'	'	'
Compensation expense recorded	2,000,000	1,300,000	4,100,000	2,600,000	'
Weighted average fair value of restricted stock granted during the period	'	'	$69,805	'	$18,041,576

Sharebased_CompensationAdditio

Share-based Compensation-Additional Information (Details) (USD $)

3 Months Ended

6 Months Ended

3 Months Ended

6 Months Ended

12 Months Ended

6 Months Ended

12 Months Ended

6 Months Ended

12 Months Ended

3 Months Ended

6 Months Ended

1 Months Ended

3 Months Ended

6 Months Ended

12 Months Ended

6 Months Ended

1 Months Ended

3 Months Ended

6 Months Ended

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Dec. 31, 2013

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2013

Dec. 31, 2013

Dec. 31, 2012

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Dec. 31, 2009

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Dec. 31, 2010

Dec. 11, 2013

Dec. 31, 2012

Dec. 17, 2012

Dec. 31, 2011

Dec. 31, 2009

Dec. 31, 2009

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Aug. 31, 2011

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2014

Jan. 01, 2008

Stock options

Stock options

Stock options

Stock options

Stock options

Stock options

Stock options

Restricted Stock Awards

Restricted Stock Awards

Restricted Stock Awards

Restricted Stock Awards

LTIP units

LTIP units

Performance Shares

Performance Shares

Performance Shares

Performance Shares

2010 Notional Unit Long-Term Compensation Plan

2010 Notional Unit Long-Term Compensation Plan

2010 Notional Unit Long-Term Compensation Plan

2010 Notional Unit Long-Term Compensation Plan

2010 Notional Unit Long-Term Compensation Plan

2010 Notional Unit Long-Term Compensation Plan

2010 Notional Unit Long-Term Compensation Plan

2010 Notional Unit Long-Term Compensation Plan

2010 Notional Unit Long-Term Compensation Plan

2010 Notional Unit Long-Term Compensation Plan

2010 Notional Unit Long-Term Compensation Plan

2010 Notional Unit Long-Term Compensation Plan

Third Amendment and Restated 2005 Stock Option and Incentive Plan

Stock options, stock appreciation rights and other awards

All other awards

2011 Outperformance Plan

2011 Outperformance Plan

2011 Outperformance Plan

2011 Outperformance Plan

2011 Outperformance Plan

Deferred Stock Compensation Plan for Directors

Employee Stock Purchase Plan

Employee Stock Purchase Plan

Minimum

Maximum

Minimum

Maximum

fungibleunits

fungibleunits

fungibleunits

Third Amended and Restated 2005 Stock Option and Incentive Plan

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Maximum fungible units that may be granted (in shares)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

17,130,000

'

'

'

'

'

'

'

'

'

'

Fungible units per share (fungible units)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2.76

0.77

1

'

'

'

'

'

'

'

'

Award expiration period

'

'

'

'

'

'

'

'

'

'5 years

'10 years

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'5 years

'10 years

'

'

'

'

'

'

'

'

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

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

17,130,000

'

'

'

'

'

'

'

'

'

'

Number of fungible units available for grant

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

3,200,000

'

'

'

'

'

'

'

'

'

'

Options vesting period

'

'

'

'

'

'

'

'

'

'1 year

'5 years

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Period of commencement of option vesting, from date of grant

'

'

'

'

'

'

'1 year

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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

'

'

'

'

'

'

$20.67

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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

'

'

'

'

'

'

$137.18

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Remaining weighted average contractual life of the options outstanding

'

'

'

'

'

'

'4 years 4 months 24 days

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Remaining weighted average contractual life of the options exercisable

'

'

'

'

'

'

'3 years 9 months 4 days

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Compensation expense

'

'

'

'

$2,000,000

$1,300,000

$4,100,000

$2,600,000

'

'

'

$4,678,269

'

$6,713,155

'

'

'

'

'

'

'

'

$1,600,000

$800,000

$1,900,000

$2,800,000

'

'

'

'

'

'

'

'

'

'

'

$4,300,000

$1,700,000

$6,100,000

$4,500,000

'

'

'

Total unrecognized compensation cost related to unvested stock awards

'

'

'

'

15,800,000

'

15,800,000

'

'

'

'

14,200,000

'

'

'

'

'

6,700,000

'

6,700,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Weighted average period for recognition of compensation cost related to unvested stock awards

'

'

'

'

'

'

'3 years

'

'

'

'

'2 years 4 months

'

'

'

'

'

'

'

'1 year 1 month 6 days

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Stock-based Compensation

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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

'

'

'

'

'

'

'

'

'

'

'

5,100,000

1,600,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Cost of the plan, subject to adjustment for forfeitures

1,900,000

1,000,000

3,500,000

2,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

31,700,000

'

'

'

'

'

'

'

'

'

27,000,000

'

'

'

'

'

'

'

Weighted average fair value of options granted during the period

'

'

'

'

'

'

69,805

'

18,041,576

'

'

0

'

17,386,949

'

21,200,000

27,100,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Share-based compensation

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2,100,000

800,000

10,300,000

1,600,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2010 Notional Unit Long-Term Compensation Plan

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

15,000,000

75,000,000

'

'

'

85,000,000

'

'

'

'

'

'

'

Stock appreciation period

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'3 years

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

366,815

'

327,416

'

385,583

'

'

'

'

'

560,908

'

'

'

'

'

'

'

Percentage of LTIP Units earned, vested on December 17, 2012 (percent)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

25.00%

'

50.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2011 Outperformance Plan

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'3 years

'

'

'

'

'

'

'

Cumulative return to stockholders (percent)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

25.00%

'

'

'

'

'

'

'

Return to stockholders

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$85,000,000

'

'

'

'

'

'

'

Award vesting rights

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'one-third

'

'

'

'

'

'

'

Portion of earned LTIP Units vested

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

33.33%

66.66%

'

'

'

'

'

'

Percentage of LTIP Units earned, vesting on August 31, 2015 (percent)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

50.00%

'

'

'

'

'

'

'

Percentage of LTIP Units earned, vesting on August 31, 2014 (percent)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

50.00%

'

'

'

'

'

'

'

Deferred Compensation Plan for Directors

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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)

'

'

'

'

'

'

'

'

'

'

'

0

'

192,563

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

5,974

'

'

Phantom stock units outstanding (in shares)

'

'

'

'

'

'

'

'

'

'

'

2,992,763

'

2,994,197

2,804,901

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

79,499

'

'

Employee Stock Purchase Plan

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Shares of common stock available for issuance (shares)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

500,000

Duration of each offering period starting the first day of each calendar quarter

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'3 months

'

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

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

85.00%

'

Shares of common stock issued (shares)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

76,727

'

Accumulated_Other_Comprehensiv4

Accumulated Other Comprehensive Loss of the Company (Details) (USD $)	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2014	Jun. 30, 2014		Jun. 30, 2014	Jun. 30, 2014
			SL Green Realty Corp	SL Green Realty Corp		SL Green Realty Corp	SL Green Realty Corp
				Net unrealized loss on derivative instruments		Unrealized gains and loss on marketable securities	Joint Venture
							Net unrealized loss on derivative instruments
Accumulated Other Comprehensive Income (Loss) of the Company [Roll Forward]	'	'	'	'		'	'
31-Dec-13	($6,196,000)	($15,211,000)	($15,211,000)	($15,125,000)	[1]	$4,784,000	($4,870,000)	[2]
Other comprehensive income (loss) before reclassifications	'	'	5,350,000	-420,000	[1]	1,702,000	4,068,000	[2]
Amounts reclassified from accumulated other comprehensive income	'	'	3,665,000	1,898,000	[1]	0	1,767,000	[2]
30-Jun-14	-6,196,000	-15,211,000	-6,196,000	-13,647,000	[1]	6,486,000	965,000	[2]
Deferred net losses from terminated hedges	$12,800,000	$13,800,000	'	'		'	'
[1]	Amounts reclassified from accumulated other comprehensive income (loss) are included in interest expense in the respective consolidated statements of income. As of JuneB 30, 2014 and DecemberB 31, 2013, the deferred net losses from these terminated hedges, which are included in accumulated other comprehensive loss relating to net unrealized loss on derivative instrument, were $12.8 million and $13.8 million, respectively.
[2]	Amounts reclassified from accumulated other comprehensive income are included in equity in net income from unconsolidated joint ventures in the respective consolidated statements of income.

Accumulated_Other_Comprehensiv5

Accumulated Other Comprehensive Loss of the Operating Partnership (Details) (USD $)	6 Months Ended
	Jun. 30, 2014		Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) of the Operating Partnership [Roll Forward]	'		'
31-Dec-13	'		($15,211,000)
30-Jun-14	-6,196,000		-15,211,000
Deferred net losses from terminated hedges	12,800,000		13,800,000
SL Green Operating Partnership	'		'
Accumulated Other Comprehensive Income (Loss) of the Operating Partnership [Roll Forward]	'		'
31-Dec-13	-15,662,000		'
Other comprehensive income (loss) before reclassifications	5,456,000		'
Amounts reclassified from accumulated other comprehensive income	3,793,000		'
30-Jun-14	-6,413,000		'
Deferred net losses from terminated hedges	13,200,000		14,200,000
Net unrealized loss on derivative instruments | SL Green Operating Partnership	'		'
Accumulated Other Comprehensive Income (Loss) of the Operating Partnership [Roll Forward]	'		'
31-Dec-13	-15,573,000	[1]	'
Other comprehensive income (loss) before reclassifications	-516,000	[1]	'
Amounts reclassified from accumulated other comprehensive income	1,964,000	[1]	'
30-Jun-14	-14,125,000	[1]	'
Unrealized gains and loss on marketable securities | SL Green Operating Partnership	'		'
Accumulated Other Comprehensive Income (Loss) of the Operating Partnership [Roll Forward]	'		'
31-Dec-13	4,926,000		'
Other comprehensive income (loss) before reclassifications	1,788,000		'
Amounts reclassified from accumulated other comprehensive income	0		'
30-Jun-14	6,714,000		'
Joint Venture | Net unrealized loss on derivative instruments | SL Green Operating Partnership	'		'
Accumulated Other Comprehensive Income (Loss) of the Operating Partnership [Roll Forward]	'		'
31-Dec-13	-5,015,000	[2]	'
Other comprehensive income (loss) before reclassifications	4,184,000	[2]	'
Amounts reclassified from accumulated other comprehensive income	1,829,000	[2]	'
30-Jun-14	$998,000	[2]	'
[1]	Amount reclassified from accumulated other comprehensive income (loss) are included in interest expense in the respective consolidated statements of income. As of JuneB 30, 2014 and DecemberB 31, 2013, the deferred net losses from these terminated hedges, which are included in accumulated other comprehensive loss relating to net unrealized loss on derivative instrument, were $13.2 million and $14.2 million, respectively.
[2]	Amounts reclassified from accumulated other comprehensive income are included in equity in net income from unconsolidated joint ventures in the respective consolidated statements of income.

Fair_Value_Measurements_Detail

Fair Value Measurements (Details) (USD $)	Jun. 30, 2014	Dec. 31, 2013
Fair Value of Financial Instruments	'	'
Marketable securities	$39,912,000	$32,049,000
Interest rate swap agreements (included in accrued interest payable and other liabilities)	18,454,000	1,329,000
Debt and preferred equity investments	1,547,808,000	1,304,839,000
Carrying Value	'	'
Fair Value of Financial Instruments	'	'
Fixed rate debt	6,096,280,000	5,599,960,000
Variable rate debt	2,261,352,000	1,319,948,000
Notional Value (in thousands)	8,357,632,000	6,919,908,000
Fair Value	'	'
Fair Value of Financial Instruments	'	'
Notional Value (in thousands)	8,812,530,000	7,214,402,000
Estimated fair value of debt and preferred equity investments, low end of range	1,500,000,000	1,300,000,000
Estimated fair value of debt and preferred equity investments, high end of range	1,700,000,000	1,400,000,000
Level 1	'	'
Fair Value of Financial Instruments	'	'
Marketable securities	4,532,000	4,307,000
Interest rate swap agreements (included in accrued interest payable and other liabilities)	0	0
Level 2	'	'
Fair Value of Financial Instruments	'	'
Marketable securities	35,380,000	24,419,000
Interest rate swap agreements (included in accrued interest payable and other liabilities)	18,454,000	1,329,000
Level 3	'	'
Fair Value of Financial Instruments	'	'
Marketable securities	0	3,323,000
Interest rate swap agreements (included in accrued interest payable and other liabilities)	0	0
Level 3 | Carrying Value	'	'
Fair Value of Financial Instruments	'	'
Debt and preferred equity investments	1,547,808,000	1,304,839,000
Level 3 | Fair Value	'	'
Fair Value of Financial Instruments	'	'
Fixed rate debt	6,533,273,000	5,886,980,000
Variable rate debt	$2,279,257,000	$1,327,422,000

Financial_Instruments_Derivati2

Financial Instruments: Derivatives and Hedging (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Financial Instruments: Derivatives and Hedging	'	'	'	'	'
Fair Value, liabilities	($18,454,000)	'	($18,454,000)	'	($1,329,000)
Fair Value, net	-18,411,000	'	-18,411,000	'	'
Estimated current balance held in accumulated other comprehensive loss to be reclassified into earnings within the next 12 months	'	'	7,100,000	'	'
Share of joint venture of accumulated other comprehensive loss reclassified into equity in net income from unconsolidated joint ventures within the next 12 months	'	'	800,000	'	'
Amount of Gain or (Loss) Recognized in Other Comprehensive Loss (Effective Portion)	5,465,000	8,069,000	3,668,000	8,249,000	'
Amount of Loss Reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion)	1,828,000	1,730,000	3,793,000	3,438,000	'
Amount of Gain or (Loss) or Recognized into Income (Ineffective Portion)	1,000	5,000	2,000	5,000	'
Interest Rate Swap	'	'	'	'	'
Financial Instruments: Derivatives and Hedging	'	'	'	'	'
Amount of Gain or (Loss) Recognized in Other Comprehensive Loss (Effective Portion)	-465,000	181,000	-516,000	140,000	'
Amount of Loss Reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion)	1,272,000	470,000	1,964,000	938,000	'
Amount of Gain or (Loss) or Recognized into Income (Ineffective Portion)	1,000	0	2,000	0	'
Interest Rate Cap expiring in November, 2015	'	'	'	'	'
Financial Instruments: Derivatives and Hedging	'	'	'	'	'
Notional Value (in thousands)	263,426,000	'	263,426,000	'	'
Strike Rate (as a percent)	6.00%	'	6.00%	'	'
Fair Value, assets	4,000	'	4,000	'	'
Interest Rate Cap Expiring in September 2015	'	'	'	'	'
Financial Instruments: Derivatives and Hedging	'	'	'	'	'
Notional Value (in thousands)	137,500,000	'	137,500,000	'	'
Strike Rate (as a percent)	4.00%	'	4.00%	'	'
Fair Value, assets	3,000	'	3,000	'	'
Interest Rate Cap Expiring in May 2016	'	'	'	'	'
Financial Instruments: Derivatives and Hedging	'	'	'	'	'
Notional Value (in thousands)	946,000,000	'	946,000,000	'	'
Strike Rate (as a percent)	4.75%	'	4.75%	'	'
Fair Value, assets	36,000	'	36,000	'	'
Interest Rate Swap Expiring in December 2017	'	'	'	'	'
Financial Instruments: Derivatives and Hedging	'	'	'	'	'
Notional Value (in thousands)	144,000,000	'	144,000,000	'	'
Strike Rate (as a percent)	2.24%	'	2.24%	'	'
Fair Value, liabilities	-5,859,000	'	-5,859,000	'	'
Interest Rate Swap Expiring in December 2017	'	'	'	'	'
Financial Instruments: Derivatives and Hedging	'	'	'	'	'
Notional Value (in thousands)	72,000,000	'	72,000,000	'	'
Strike Rate (as a percent)	2.31%	'	2.31%	'	'
Fair Value, liabilities	-3,109,000	'	-3,109,000	'	'
Interest Rate Swap Expiring in December 2017	'	'	'	'	'
Financial Instruments: Derivatives and Hedging	'	'	'	'	'
Notional Value (in thousands)	72,000,000	'	72,000,000	'	'
Strike Rate (as a percent)	2.31%	'	2.31%	'	'
Fair Value, liabilities	-3,109,000	'	-3,109,000	'	'
Interest Rate Swap Expiring in December 2017	'	'	'	'	'
Financial Instruments: Derivatives and Hedging	'	'	'	'	'
Notional Value (in thousands)	57,600,000	'	57,600,000	'	'
Strike Rate (as a percent)	1.99%	'	1.99%	'	'
Fair Value, liabilities	-1,859,000	'	-1,859,000	'	'
Interest Rate Swap Expiring in December 2017	'	'	'	'	'
Financial Instruments: Derivatives and Hedging	'	'	'	'	'
Notional Value (in thousands)	86,400,000	'	86,400,000	'	'
Strike Rate (as a percent)	1.95%	'	1.95%	'	'
Fair Value, liabilities	-2,664,000	'	-2,664,000	'	'
Interest Rate Swap Expiring in December 2017	'	'	'	'	'
Financial Instruments: Derivatives and Hedging	'	'	'	'	'
Notional Value (in thousands)	72,000,000	'	72,000,000	'	'
Strike Rate (as a percent)	1.35%	'	1.35%	'	'
Fair Value, liabilities	-747,000	'	-747,000	'	'
Interest Rate Cap expiring in June, 2016	'	'	'	'	'
Financial Instruments: Derivatives and Hedging	'	'	'	'	'
Notional Value (in thousands)	30,000,000	'	30,000,000	'	'
Strike Rate (as a percent)	2.30%	'	2.30%	'	'
Fair Value, liabilities	-1,078,000	'	-1,078,000	'	'
Interest Rate Swap expiring in February, 2015	'	'	'	'	'
Financial Instruments: Derivatives and Hedging	'	'	'	'	'
Notional Value (in thousands)	8,500,000	'	8,500,000	'	'
Strike Rate (as a percent)	0.74%	'	0.74%	'	'
Fair Value, liabilities	-29,000	'	-29,000	'	'
Share of unconsolidated joint ventures' derivative instruments	'	'	'	'	'
Financial Instruments: Derivatives and Hedging	'	'	'	'	'
Amount of Gain or (Loss) Recognized in Other Comprehensive Loss (Effective Portion)	5,930,000	7,888,000	4,184,000	8,109,000	'
Amount of Loss Reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion)	556,000	1,260,000	1,829,000	2,500,000	'
Amount of Gain or (Loss) or Recognized into Income (Ineffective Portion)	$0	$5,000	$0	$5,000	'

Commitments_and_Contingencies_1

Commitments and Contingencies (Details) (USD $)	6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014
Commitments and Contingencies Disclosure [Abstract]	'
Initial term of non cancellable operating leases, minimum	'1 year
Capital lease	'
Remaining 2014	$73
2015	145
2016	170
2017	291
2018	291
Thereafter	56,884
Total minimum lease payments	57,854
Less amount representing interest	-37,219
Capitalized lease obligations	20,635
Non-cancellable operating leases	'
Remaining 2014	15,351
2015	30,703
2016	30,824
2017	31,057
2018	31,057
Thereafter	766,187
Total minimum lease payments	$905,179

Segment_Information_Details

Segment Information (Details) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
			segment
Segment information	'	'	'	'	'
Number of reportable segments (segment)	'	'	2	'	'
Total revenues	$387,227	$353,944	$762,796	$707,565	'
Income (loss) from continuing operations before equity in net gain on sale of interest in unconsolidated joint venture/real estate	58,318	33,298	106,500	57,841	'
Total assets	16,717,736	'	16,717,736	'	14,959,001
Leverage rate assumption (as a percent)	'	'	100.00%	'	'
Marketing, general and administrative	23,872	21,514	47,128	42,582	'
Real Estate Segment	'	'	'	'	'
Segment information	'	'	'	'	'
Total revenues	347,513	307,213	668,998	608,126	'
Income (loss) from continuing operations before equity in net gain on sale of interest in unconsolidated joint venture/real estate	24,318	-4,742	26,918	-23,548	'
Total assets	15,155,384	'	15,155,384	'	13,641,727
Debt and Preferred Equity Segment	'	'	'	'	'
Segment information	'	'	'	'	'
Total revenues	39,714	46,731	93,798	99,439	'
Income (loss) from continuing operations before equity in net gain on sale of interest in unconsolidated joint venture/real estate	34,000	38,040	79,582	81,389	'
Total assets	$1,562,352	'	$1,562,352	'	$1,317,274

Segment_Information_Details_2

Segment Information (Details 2) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Reconciliation of income from continuing operations to net income attributable to SL Green common stockholders	'	'	'	'
Income from continuing operations before purchase price fair value adjustment and equity in net gain (loss) on sale of interest in unconsolidated joint venture/real estate	$58,318	$33,298	$106,500	$57,841
Purchase price fair value adjustment	71,446	-2,305	71,446	-2,305
Equity in net gain (loss) on sale of interest in unconsolidated joint venture/real estate	1,444	-3,583	106,084	-3,583
Income from continuing operations	131,208	27,410	284,030	51,953
Net income from discontinued operations	4,389	3,838	8,178	8,519
Gain on sale of discontinued operations	114,735	0	114,735	1,113
Net income	$250,332	$31,248	$406,943	$61,585