Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Commercial real estate properties, at cost:
Land and land interests	$ 4,689,031	$ 3,844,518
Building and improvements	10,079,151	8,778,593
Building leasehold and improvements	1,425,299	1,418,585
Properties under capital lease	47,445	27,445
Total commercial real estate properties, at cost	16,240,926	14,069,141
Less: accumulated depreciation	(1,979,824)	(1,905,165)
Total commercial real estate properties, net	14,261,102	12,163,976
Assets held for sale	117,885	462,430
Cash and cash equivalents	244,360	281,409
Restricted cash	279,592	149,176
Investment in marketable securities	46,432	39,429
Tenant and other receivables, net of allowance of $15,712 and $18,068 in 2015 and 2014, respectively	66,896	57,369
Related party receivables	11,089	11,735
Deferred rents receivable, net of allowance of $22,190 and $27,411 in 2015 and 2014, respectively	467,627	374,944
Debt and preferred equity investments, net of discounts and deferred origination fees of $16,169 and $19,172 in 2015 and 2014, respectively	1,501,619	1,408,804
Investments in unconsolidated joint ventures	1,239,008	1,172,020
Deferred costs, net	342,936	327,962
Other assets	912,023	647,333
Total assets	19,490,569	17,096,587
Liabilities
Mortgages and other loans payable	6,865,383	5,586,709
Revolving credit facility	949,000	385,000
Term loan and senior unsecured notes	2,216,120	2,107,078
Accrued interest payable and other liabilities	204,224	137,634
Accounts payable and accrued expenses	173,228	173,246
Deferred revenue	428,334	187,148
Capital lease obligations	41,171	20,822
Deferred land leases payable	1,557	1,215
Dividend and distributions payable	67,109	64,393
Security deposits	66,654	66,614
Liabilities related to assets held for sale	94	266,873
Junior subordinated deferrable interest debentures held by trusts that issued trust preferred securities	100,000	100,000
Total liabilities	$ 11,112,874	$ 9,096,732
Commitments and contingencies
Noncontrolling interests in Operating Partnership	$ 423,421	$ 469,524
Preferred units	282,516	71,115
Equity
Common stock, $0.01 par value, 160,000 shares authorized and 103,383 and 100,928 issued and outstanding at September 30, 2015 and December 31, 2014, respectively (including 3,724 and 3,603 shares held in Treasury at September 30, 2015 and December 31, 2014, respectively)	1,034	1,010
Additional paid-in-capital	5,593,653	5,289,479
Treasury stock at cost	(335,311)	(320,471)
Accumulated other comprehensive loss	(15,821)	(6,980)
Retained earnings	1,772,833	1,752,404
Total SL Green stockholders' equity	7,238,320	6,937,374
Noncontrolling interests in other partnerships	433,438	521,842
Total equity	7,671,758	7,459,216
SL Green stockholders equity:
Total liabilities and equity/capital	19,490,569	17,096,587
Series I Preferred Stock
Equity
Series I Preferred Stock, $0.01 par value, $25.00 liquidation preference, 9,200 issued and outstanding at both September 30, 2015 and December 31, 2014	221,932	221,932
SL Green Operating Partnership
Commercial real estate properties, at cost:
Land and land interests	4,689,031	3,844,518
Building and improvements	10,079,151	8,778,593
Building leasehold and improvements	1,425,299	1,418,585
Properties under capital lease	47,445	27,445
Total commercial real estate properties, at cost	16,240,926	14,069,141
Less: accumulated depreciation	(1,979,824)	(1,905,165)
Total commercial real estate properties, net	14,261,102	12,163,976
Assets held for sale	117,885	462,430
Cash and cash equivalents	244,360	281,409
Restricted cash	279,592	149,176
Investment in marketable securities	46,432	39,429
Tenant and other receivables, net of allowance of $15,712 and $18,068 in 2015 and 2014, respectively	66,896	57,369
Related party receivables	11,089	11,735
Deferred rents receivable, net of allowance of $22,190 and $27,411 in 2015 and 2014, respectively	467,627	374,944
Debt and preferred equity investments, net of discounts and deferred origination fees of $16,169 and $19,172 in 2015 and 2014, respectively	1,501,619	1,408,804
Investments in unconsolidated joint ventures	1,239,008	1,172,020
Deferred costs, net	342,936	327,962
Other assets	912,023	647,333
Total assets	19,490,569	17,096,587
Liabilities
Mortgages and other loans payable	6,865,383	5,586,709
Revolving credit facility	949,000	385,000
Term loan and senior unsecured notes	2,216,120	2,107,078
Accrued interest payable and other liabilities	204,224	137,634
Accounts payable and accrued expenses	173,228	173,246
Deferred revenue	428,334	187,148
Capital lease obligations	41,171	20,822
Deferred land leases payable	1,557	1,215
Dividend and distributions payable	67,109	64,393
Security deposits	66,654	66,614
Liabilities related to assets held for sale	94	266,873
Junior subordinated deferrable interest debentures held by trusts that issued trust preferred securities	100,000	100,000
Total liabilities	$ 11,112,874	$ 9,096,732
Commitments and contingencies
Preferred units	$ 282,516	$ 71,115
Equity
Accumulated other comprehensive loss	(16,446)	(7,256)
SL Green stockholders equity:
SL Green partners' capital (1,035 and 1,013 general partner common units and 98,624 and 96,312 limited partner common units outstanding at September 30, 2015 and December 31, 2014, respectively)	7,357,047	7,078,924
Limited partner interests in SLGOP (3,875 and 3,973 limited partner common units outstanding at September 30, 2015 and December 31, 2014, respectively)	99,208	113,298
Total SLGOP partners' capital	7,661,741	7,406,898
Noncontrolling interests in other partnerships	433,438	521,842
Total capital	8,095,179	7,928,740
Total liabilities and equity/capital	19,490,569	17,096,587
SL Green Operating Partnership | Series I Preferred Stock
SL Green stockholders equity:
Series I Preferred Units, $25.00 liquidation preference, 9,200 issued and outstanding at both September 30, 2015 and December 31, 2014	221,932	221,932
Total capital	$ 221,932	$ 221,932