Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Commercial real estate properties, at cost:
Land and land interests	$ 3,347,482	$ 4,779,159
Building and improvements	7,777,647	10,423,739
Building leasehold and improvements	1,436,287	1,431,259
Properties under capital lease	47,445	47,445
Total commercial real estate properties, at cost	12,608,861	16,681,602
Less: accumulated depreciation	(2,190,142)	(2,060,706)
Total commercial real estate properties, net	10,418,719	14,620,896
Assets held for sale	117,159	34,981
Cash and cash equivalents	405,896	255,399
Restricted cash	100,195	233,578
Investments in marketable securities	60,352	45,138
Tenant and other receivables, net of allowance of $18,278 and $17,618 in 2016 and 2015, respectively	55,976	63,491
Related party receivables	14,840	10,650
Deferred rents receivable, net of allowance of $24,922 and $21,730 in 2016 and 2015, respectively	430,642	498,776
Debt and preferred equity investments, net of discounts and deferred origination fees of $14,630 and $18,759 in 2016 and 2015, respectively	1,453,234	1,670,020
Investments in unconsolidated joint ventures	1,860,912	1,203,858
Deferred costs, net	252,179	239,920
Other assets	620,838	850,939
Total assets	15,790,942	19,727,646
Liabilities
Mortgages and other loans payable, net	3,954,155	6,881,920
Revolving credit facility, net	0	985,055
Term loan and senior unsecured notes, net	2,303,657	2,308,478
Accrued interest payable	30,734	42,406
Other liabilities	211,513	168,477
Accounts payable and accrued expenses	178,946	196,213
Deferred revenue	237,548	399,102
Capital lease obligations	41,951	41,360
Deferred land leases payable	2,419	1,783
Dividend and distributions payable	81,392	79,790
Security deposits	67,709	68,023
Liabilities related to assets held for sale	65,520	29,000
Junior subordinated deferrable interest debentures held by trusts that issued trust preferred securities	100,000	100,000
Total liabilities	7,275,544	11,301,607
Commitments and contingencies
Noncontrolling interests in Operating Partnership	490,440	424,206
Preferred units	302,310	282,516
Equity
Series I Preferred Stock, $0.01 par value, $25.00 liquidation preference, 9,200 issued and outstanding at both September 30, 2016 and December 31, 2015	221,932	221,932
Common stock, $0.01 par value, 160,000 shares authorized and 101,319 and 100,063 issued and outstanding at September 30, 2016 and December 31, 2015, respectively (including 1,055 and 87 shares held in treasury at September 30, 2016 and December 31, 2015, respectively)	1,013	1,001
Additional paid-in-capital	5,596,026	5,439,735
Treasury stock at cost	(124,049)	(10,000)
Accumulated other comprehensive loss	(14,074)	(8,749)
Retained earnings	1,612,707	1,643,546
Total SL Green stockholders' equity	7,293,555	7,287,465
Noncontrolling interests in other partnerships	429,093	431,852
Total equity	7,722,648	7,719,317
SL Green stockholders equity:
Total liabilities and equity/capital	15,790,942	19,727,646
SL Green Operating Partnership
Commercial real estate properties, at cost:
Land and land interests	3,347,482	4,779,159
Building and improvements	7,777,647	10,423,739
Building leasehold and improvements	1,436,287	1,431,259
Properties under capital lease	47,445	47,445
Total commercial real estate properties, at cost	12,608,861	16,681,602
Less: accumulated depreciation	(2,190,142)	(2,060,706)
Total commercial real estate properties, net	10,418,719	14,620,896
Assets held for sale	117,159	34,981
Cash and cash equivalents	405,896	255,399
Restricted cash	100,195	233,578
Investments in marketable securities	60,352	45,138
Tenant and other receivables, net of allowance of $18,278 and $17,618 in 2016 and 2015, respectively	55,976	63,491
Related party receivables	14,840	10,650
Deferred rents receivable, net of allowance of $24,922 and $21,730 in 2016 and 2015, respectively	430,642	498,776
Debt and preferred equity investments, net of discounts and deferred origination fees of $14,630 and $18,759 in 2016 and 2015, respectively	1,453,234	1,670,020
Investments in unconsolidated joint ventures	1,860,912	1,203,858
Deferred costs, net	252,179	239,920
Other assets	620,838	850,939
Total assets	15,790,942	19,727,646
Liabilities
Mortgages and other loans payable, net	3,954,155	6,881,920
Revolving credit facility, net	0	985,055
Term loan and senior unsecured notes, net	2,303,657	2,308,478
Accrued interest payable	30,734	42,406
Other liabilities	211,513	168,477
Accounts payable and accrued expenses	178,946	196,213
Deferred revenue	237,548	399,102
Capital lease obligations	41,951	41,360
Deferred land leases payable	2,419	1,783
Dividend and distributions payable	81,392	79,790
Security deposits	67,709	68,023
Liabilities related to assets held for sale	65,520	29,000
Junior subordinated deferrable interest debentures held by trusts that issued trust preferred securities	100,000	100,000
Total liabilities	7,275,544	11,301,607
Commitments and contingencies
Noncontrolling interests in Operating Partnership	490,440	424,206
Limited partner interests in SLGOP (4,495 and 3,746 limited partner common units outstanding at September 30, 2016 and December 31, 2015, respectively)	490,440	424,206
Preferred units	302,310	282,516
Equity
Accumulated other comprehensive loss	(14,074)	(8,749)
SL Green stockholders equity:
Series I Preferred Units, $25.00 liquidation preference, 9,200 issued and outstanding at both September 30, 2016 and December 31, 2015	221,932	221,932
SL Green partners' capital (1,047 and 1,035 general partner common units and 99,217 and 98,941 limited partner common units outstanding at September 30, 2016 and December 31, 2015, respectively)	7,085,697	7,074,282
Total SLGOP partners' capital	7,293,555	7,287,465
Noncontrolling interests in other partnerships	429,093	431,852
Total capital	7,722,648	7,719,317
Total liabilities and equity/capital	$ 15,790,942	$ 19,727,646