Consolidated Balance Sheets - USD ($) $ in Thousands		Mar. 31, 2021	Dec. 31, 2020
Commercial real estate properties, at cost:
Land and land interests		$ 1,445,199	$ 1,315,832
Building and improvements		4,096,930	4,168,193
Building leasehold and improvements		1,730,418	1,448,134
Right of use asset - financing leases		55,711	55,711
Right of use asset - operating leases		502,316	367,209
Total commercial real estate properties, at cost		7,830,574	7,355,079
Less: accumulated depreciation		(2,004,945)	(1,956,077)
Total commercial real estate properties, net		5,825,629	5,399,002
Cash and cash equivalents		304,999	266,059
Restricted cash		96,608	106,736
Investments in marketable securities		23,784	28,570
Tenant and other receivables		42,505	44,507
Related party receivables		34,310	34,657
Deferred rents receivable		304,420	302,791
Debt and preferred equity investments, net of discounts and deferred origination fees of $9,817 and $11,232 and allowances of $13,213 and $13,213 in 2021 and 2020, respectively		1,097,202	1,076,542
Investments in unconsolidated joint ventures		3,698,701	3,823,322
Deferred costs, net		170,252	177,168
Other assets		445,635	448,213
Total assets	[1]	12,044,045	11,707,567
Liabilities
Mortgages and other loans payable, net		1,848,701	1,979,972
Revolving credit facility, net		625,809	105,262
Unsecured term loans, net		1,495,620	1,495,275
Unsecured notes, net		1,248,622	1,248,219
Accrued interest payable		22,796	14,825
Other liabilities		267,908	302,798
Accounts payable and accrued expenses		120,015	151,309
Deferred revenue		119,215	118,572
Lease liability - financing leases		152,622	152,521
Lease liability - operating leases		455,385	339,458
Dividend and distributions payable		24,924	149,294
Security deposits		54,181	53,836
Junior subordinated deferrable interest debentures held by trusts that issued trust preferred securities		100,000	100,000
Total liabilities	[1]	6,535,798	6,211,341
Commitments and contingencies
Noncontrolling interests in Operating Partnership		374,124	358,262
Preferred units		198,503	202,169
Equity
Series I Preferred Stock, $0.01 par value, $25.00 liquidation preference, 9,200 issued and outstanding at both March 31, 2021 and December 31, 2020		221,932	221,932
Common stock, $0.01 par value, 160,000 shares authorized and 70,380 and 69,534 issued and outstanding at March 31, 2021 and December 31, 2020, respectively (including 1,026 and 1,026 shares held in treasury at March 31, 2021 and December 31, 2020, respectively)		705	716
Additional paid-in-capital		3,913,258	3,862,949
Treasury stock at cost		(124,049)	(124,049)
Accumulated other comprehensive loss		(18,897)	(67,247)
Retained earnings		918,077	1,015,462
Total SL Green stockholders' equity		4,911,026	4,909,763
Noncontrolling interests in other partnerships		24,594	26,032
Total equity		4,935,620	4,935,795
SL Green stockholders equity:
Total liabilities and equity/capital		12,044,045	11,707,567
SL Green Operating Partnership
Commercial real estate properties, at cost:
Land and land interests		1,445,199	1,315,832
Building and improvements		4,096,930	4,168,193
Building leasehold and improvements		1,730,418	1,448,134
Right of use asset - financing leases		55,711	55,711
Right of use asset - operating leases		502,316	367,209
Total commercial real estate properties, at cost		7,830,574	7,355,079
Less: accumulated depreciation		(2,004,945)	(1,956,077)
Total commercial real estate properties, net		5,825,629	5,399,002
Cash and cash equivalents		304,999	266,059
Restricted cash		96,608	106,736
Investments in marketable securities		23,784	28,570
Tenant and other receivables		42,505	44,507
Related party receivables		34,310	34,657
Deferred rents receivable		304,420	302,791
Debt and preferred equity investments, net of discounts and deferred origination fees of $9,817 and $11,232 and allowances of $13,213 and $13,213 in 2021 and 2020, respectively		1,097,202	1,076,542
Investments in unconsolidated joint ventures		3,698,701	3,823,322
Deferred costs, net		170,252	177,168
Other assets		445,635	448,213
Total assets	[2]	12,044,045	11,707,567
Liabilities
Mortgages and other loans payable, net		1,848,701	1,979,972
Revolving credit facility, net		625,809	105,262
Unsecured term loans, net		1,495,620	1,495,275
Unsecured notes, net		1,248,622	1,248,219
Accrued interest payable		22,796	14,825
Other liabilities		267,908	302,798
Accounts payable and accrued expenses		120,015	151,309
Deferred revenue		119,215	118,572
Lease liability - financing leases		152,622	152,521
Lease liability - operating leases		455,385	339,458
Dividend and distributions payable		24,924	149,294
Security deposits		54,181	53,836
Liabilities related to assets held for sale		0	0
Junior subordinated deferrable interest debentures held by trusts that issued trust preferred securities		100,000	100,000
Total liabilities	[2]	6,535,798	6,211,341
Commitments and contingencies
Limited partner interests in SLGOP (4,156 and 3,939 limited partner common units outstanding at March 31, 2021 and December 31, 2020, respectively)		374,124	358,262
Preferred units		198,503	202,169
Equity
Accumulated other comprehensive loss		(18,897)	(67,247)
SL Green stockholders equity:
Series I Preferred Units, $25.00 liquidation preference, 9,200 issued and outstanding at both March 31, 2021 and December 31, 2020		221,932	221,932
SL Green partners' capital (735 and 724 general partner common units and 68,619 and 67,784 limited partner common units outstanding at March 31, 2021 and December 31, 2020, respectively)		4,707,991	4,755,078
Total SLGOP partners' capital		4,911,026	4,909,763
Noncontrolling interests in other partnerships		24,594	26,032
Total capital		4,935,620	4,935,795
Total liabilities and equity/capital		12,044,045	11,707,567
Variable Interest Entity, Primary Beneficiary
Commercial real estate properties, at cost:
Land and land interests		179,600	41,200
Building and improvements		282,300	57,900
Building leasehold and improvements		2,000	2,000
Right of use asset - financing leases		53,200	37,800
Less: accumulated depreciation		(16,400)	(10,300)
Other assets		297,100	289,500
Liabilities
Mortgages and other loans payable, net		368,600	94,000
Accrued interest payable		900	700
Other liabilities		31,200	56,600
Lease liability - financing leases		$ 45,300	$ 29,900

[1] The Company's consolidated balance sheets include assets and liabilities of consolidated variable interest entities ("VIEs"). See Note 2. The consolidated balance sheets include the following amounts related to our consolidated VIEs, excluding the Operating Partnership: $179.6 million and $41.2 million of land, $282.3 million and $57.9 million of building and improvements, $2.0 million and $2.0 million of building and leasehold improvements, $53.2 million and $37.8 million of right of use assets, $16.4 million and $10.3 million of accumulated depreciation, $297.1 million and $289.5 million of other assets included in other line items, $368.6 million and $94.0 million of real estate debt, net, $0.9 million and $0.7 million of accrued interest payable, $45.3 million and $29.9 million of lease liabilities, and $31.2 million and $56.6 million of other liabilities included in other line items as of March 31, 2021 and December 31, 2020, respectively.

[2] The Operating Partnership's consolidated balance sheets include assets and liabilities of consolidated variable interest entities ("VIEs"). See Note 2. The consolidated balance sheets include the following amounts related to our consolidated VIEs, excluding the Operating Partnership: $179.6 million and $41.2 million of land, $282.3 million and $57.9 million of building and improvements, $2.0 million and $2.0 million of building and leasehold improvements, $53.2 million and $37.8 million of right of use assets, $16.4 million and $10.3 million of accumulated depreciation, $297.1 million and $289.5 million of other assets included in other line items, $368.6 million and $94.0 million of real estate debt, net, $0.9 million and $0.7 million of accrued interest payable, $45.3 million and $29.9 million of lease liabilities, and $31.2 million and $56.6 million of other liabilities included in other line items as of March 31, 2021 and December 31, 2020, respectively.