Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Commercial real estate properties, at cost:
Land and land interests	$ 4,108,821	$ 4,779,159
Building and improvements	9,362,614	10,423,739
Building leasehold and improvements	1,435,255	1,431,259
Properties under capital lease	47,445	47,445
Total commercial real estate properties, at cost	14,954,135	16,681,602
Less: accumulated depreciation	(2,166,059)	(2,060,706)
Total commercial real estate properties, net	12,788,076	14,620,896
Assets held for sale	39,642	34,981
Cash and cash equivalents	276,226	255,399
Restricted cash	166,905	233,578
Investments in marketable securities	39,339	45,138
Tenant and other receivables, net of allowance of $18,728 and $17,618 in 2016 and 2015, respectively	57,551	63,491
Related party receivables	13,059	10,650
Deferred rents receivable, net of allowance of $22,917 and $21,730 in 2016 and 2015, respectively	443,981	498,776
Debt and preferred equity investments, net of discounts and deferred origination fees of $14,329 and $18,759 in 2016 and 2015, respectively	1,357,181	1,670,020
Investments in unconsolidated joint ventures	1,126,486	1,203,858
Deferred costs, net	256,303	239,920
Other assets	979,474	850,939
Total assets	17,544,223	19,727,646
Liabilities
Mortgages and other loans payable, net	5,524,110	6,881,920
Revolving credit facility, net	277,420	985,055
Term loan and senior unsecured notes, net	2,060,690	2,308,478
Accrued interest payable	36,378	42,406
Other liabilities	243,011	168,477
Accounts payable and accrued expenses	189,690	196,213
Deferred revenue	384,145	399,102
Capital lease obligations	41,751	41,360
Deferred land leases payable	2,236	1,783
Dividend and distributions payable	80,555	79,790
Security deposits	68,199	68,023
Liabilities related to assets held for sale	7	29,000
Junior subordinated deferrable interest debentures held by trusts that issued trust preferred securities	100,000	100,000
Total liabilities	9,008,192	11,301,607
Commitments and contingencies
Noncontrolling interests in Operating Partnership	486,452	424,206
Preferred units	302,460	282,516
Equity
Common stock, $0.01 par value, 160,000 shares authorized and 100,164 and 100,063 issued and outstanding at June 30, 2016 and December 31, 2015, respectively (including 87 shares held in treasury at June 30, 2016 and December 31, 2015)	1,003	1,001
Additional paid-in-capital	5,466,593	5,439,735
Treasury stock at cost	(10,000)	(10,000)
Accumulated other comprehensive loss	(16,558)	(8,749)
Retained earnings	1,655,320	1,643,546
Total SL Green stockholders' equity	7,318,290	7,287,465
Noncontrolling interests in other partnerships	428,829	431,852
Total equity	7,747,119	7,719,317
SL Green stockholders equity:
Total liabilities and equity/capital	17,544,223	19,727,646
Series I Preferred Stock
Equity
Series I Preferred Stock, $0.01 par value, $25.00 liquidation preference, 9,200 issued and outstanding at both June 30, 2016 and December 31, 2015	221,932	221,932
SL Green Operating Partnership
Commercial real estate properties, at cost:
Land and land interests	4,108,821	4,779,159
Building and improvements	9,362,614	10,423,739
Building leasehold and improvements	1,435,255	1,431,259
Properties under capital lease	47,445	47,445
Total commercial real estate properties, at cost	14,954,135	16,681,602
Less: accumulated depreciation	(2,166,059)	(2,060,706)
Total commercial real estate properties, net	12,788,076	14,620,896
Assets held for sale	39,642	34,981
Cash and cash equivalents	276,226	255,399
Restricted cash	166,905	233,578
Investments in marketable securities	39,339	45,138
Tenant and other receivables, net of allowance of $18,728 and $17,618 in 2016 and 2015, respectively	57,551	63,491
Related party receivables	13,059	10,650
Deferred rents receivable, net of allowance of $22,917 and $21,730 in 2016 and 2015, respectively	443,981	498,776
Debt and preferred equity investments, net of discounts and deferred origination fees of $14,329 and $18,759 in 2016 and 2015, respectively	1,357,181	1,670,020
Investments in unconsolidated joint ventures	1,126,486	1,203,858
Deferred costs, net	256,303	239,920
Other assets	979,474	850,939
Total assets	17,544,223	19,727,646
Liabilities
Mortgages and other loans payable, net	5,524,110	6,881,920
Revolving credit facility, net	277,420	985,055
Term loan and senior unsecured notes, net	2,060,690	2,308,478
Accrued interest payable	36,378	42,406
Other liabilities	243,011	168,477
Accounts payable and accrued expenses	189,690	196,213
Deferred revenue	384,145	399,102
Capital lease obligations	41,751	41,360
Deferred land leases payable	2,236	1,783
Dividend and distributions payable	80,555	79,790
Security deposits	68,199	68,023
Liabilities related to assets held for sale	7	29,000
Junior subordinated deferrable interest debentures held by trusts that issued trust preferred securities	100,000	100,000
Total liabilities	9,008,192	11,301,607
Commitments and contingencies
Noncontrolling interests in Operating Partnership	486,452	424,206
Limited partner interests in SLGOP (4,504 and 3,746 limited partner common units outstanding at June 30, 2016 and December 31, 2015, respectively)	486,452	424,206
Preferred units	302,460	282,516
SL Green stockholders equity:
SL Green partners' capital (1,041 and 1,035 general partner common units and 99,041 and 98,941 limited partner common units outstanding at June 30, 2016 and December 31, 2015, respectively)	7,112,916	7,074,282
Total SLGOP partners' capital	7,318,290	7,287,465
Noncontrolling interests in other partnerships	428,829	431,852
Total capital	7,747,119	7,719,317
Total liabilities and equity/capital	17,544,223	19,727,646
SL Green Operating Partnership | Series I Preferred Stock
SL Green stockholders equity:
Series I Preferred Units, $25.00 liquidation preference, 9,200 issued and outstanding at both June 30, 2016 and December 31, 2015	$ 221,932	$ 221,932