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