Consolidated Balance Sheets - USD ($) $ in Thousands		Sep. 30, 2021	Dec. 31, 2020
Commercial real estate properties, at cost:
Land and land interests		$ 1,489,101	$ 1,315,832
Building and improvements		3,828,052	4,168,193
Building leasehold and improvements		1,649,796	1,448,134
Right of use asset - financing leases		27,445	55,711
Right of use asset - operating leases		498,416	367,209
Total commercial real estate properties, at cost		7,492,810	7,355,079
Less: accumulated depreciation		(1,904,465)	(1,956,077)
Total commercial real estate properties, net		5,588,345	5,399,002
Cash and cash equivalents		257,941	266,059
Restricted cash		87,992	106,736
Investments in marketable securities		34,428	28,570
Tenant and other receivables		44,964	44,507
Related party receivables		35,674	34,657
Deferred rents receivable		254,277	302,791
Debt and preferred equity investments, net of discounts and deferred origination fees of $6,494 and $11,232 and allowances of $6,630 and $13,213 in 2021 and 2020, respectively		1,052,110	1,076,542
Investments in unconsolidated joint ventures		3,028,084	3,823,322
Deferred costs, net		124,637	177,168
Other assets		347,407	448,213
Total assets	[1]	10,855,859	11,707,567
Liabilities
Mortgages and other loans payable, net		1,422,287	1,979,972
Revolving credit facility, net		216,902	105,262
Unsecured term loans, net		1,496,583	1,495,275
Unsecured notes, net		899,118	1,248,219
Accrued interest payable		20,777	14,825
Other liabilities		157,375	302,798
Accounts payable and accrued expenses		137,946	151,309
Deferred revenue		120,567	118,572
Lease liability - financing leases		125,168	152,521
Lease liability - operating leases		437,357	339,458
Dividend and distributions payable		23,958	149,294
Security deposits		54,366	53,836
Junior subordinated deferrable interest debentures held by trusts that issued trust preferred securities		100,000	100,000
Total liabilities	[1]	5,212,404	6,211,341
Commitments and contingencies
Noncontrolling interests in Operating Partnership		362,737	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 September 30, 2021 and December 31, 2020		221,932	221,932
Common stock, $0.01 par value, 160,000 shares authorized and 67,926 and 69,534 issued and outstanding at September 30, 2021 and December 31, 2020, respectively (including 1,061 and 1,026 shares held in treasury at September 30, 2021 and December 31, 2020, respectively)		680	716
Additional paid-in-capital		3,774,119	3,862,949
Treasury stock at cost		(126,160)	(124,049)
Accumulated other comprehensive loss		(60,597)	(67,247)
Retained earnings		1,258,232	1,015,462
Total SL Green stockholders' equity		5,068,206	4,909,763
Noncontrolling interests in other partnerships		14,009	26,032
Total equity		5,082,215	4,935,795
SL Green stockholders equity:
Total liabilities and equity/capital		10,855,859	11,707,567
SL Green Operating Partnership
Commercial real estate properties, at cost:
Land and land interests		1,489,101	1,315,832
Building and improvements		3,828,052	4,168,193
Building leasehold and improvements		1,649,796	1,448,134
Right of use asset - financing leases		27,445	55,711
Right of use asset - operating leases		498,416	367,209
Total commercial real estate properties, at cost		7,492,810	7,355,079
Less: accumulated depreciation		(1,904,465)	(1,956,077)
Total commercial real estate properties, net		5,588,345	5,399,002
Cash and cash equivalents		257,941	266,059
Restricted cash		87,992	106,736
Investments in marketable securities		34,428	28,570
Tenant and other receivables		44,964	44,507
Related party receivables		35,674	34,657
Deferred rents receivable		254,277	302,791
Debt and preferred equity investments, net of discounts and deferred origination fees of $6,494 and $11,232 and allowances of $6,630 and $13,213 in 2021 and 2020, respectively		1,052,110	1,076,542
Investments in unconsolidated joint ventures		3,028,084	3,823,322
Deferred costs, net		124,637	177,168
Other assets		347,407	448,213
Total assets	[2]	10,855,859	11,707,567
Liabilities
Mortgages and other loans payable, net		1,422,287	1,979,972
Revolving credit facility, net		216,902	105,262
Unsecured term loans, net		1,496,583	1,495,275
Unsecured notes, net		899,118	1,248,219
Accrued interest payable		20,777	14,825
Other liabilities		157,375	302,798
Accounts payable and accrued expenses		137,946	151,309
Deferred revenue		120,567	118,572
Lease liability - financing leases		125,168	152,521
Lease liability - operating leases		437,357	339,458
Dividend and distributions payable		23,958	149,294
Security deposits		54,366	53,836
Junior subordinated deferrable interest debentures held by trusts that issued trust preferred securities		100,000	100,000
Total liabilities	[2]	5,212,404	6,211,341
Commitments and contingencies
Limited partner interests in SLGOP (3,888 and 3,939 limited partner common units outstanding at September 30, 2021 and December 31, 2020, respectively)		362,737	358,262
Preferred units		198,503	202,169
Equity
Accumulated other comprehensive loss		(60,597)	(67,247)
SL Green stockholders equity:
Series I Preferred Units, $25.00 liquidation preference, 9,200 issued and outstanding at both September 30, 2021 and December 31, 2020		221,932	221,932
SL Green partners' capital (707 and 724 general partner common units and 66,158 and 67,784 limited partner common units outstanding at September 30, 2021 and December 31, 2020, respectively)		4,906,871	4,755,078
Total SLGOP partners' capital		5,068,206	4,909,763
Noncontrolling interests in other partnerships		14,009	26,032
Total capital		5,082,215	4,935,795
Total liabilities and equity/capital		$ 10,855,859	$ 11,707,567

[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: $316.0 million and $41.2 million of land, $341.2 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, $18.5 million and $10.3 million of accumulated depreciation, $293.8 million and $289.5 million of other assets included in other line items, $450.1 million and $94.0 million of real estate debt, net, $1.3 million and $0.7 million of accrued interest payable, $45.4 million and $29.9 million of lease liabilities, and $24.9 million and $56.6 million of other liabilities included in other line items as of September 30, 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: $316.0 million and $41.2 million of land, $341.2 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, $18.5 million and $10.3 million of accumulated depreciation, $293.8 million and $289.5 million of other assets included in other line items, $450.1 million and $94.0 million of real estate debt, net, $1.3 million and $0.7 million of accrued interest payable, $45.4 million and $29.9 million of lease liabilities, and $24.9 million and $56.6 million of other liabilities included in other line items as of September 30, 2021 and December 31, 2020, respectively.