Consolidated Balance Sheets - USD ($) shares in Thousands, $ in Thousands		Dec. 31, 2020	Dec. 31, 2019
Commercial real estate properties, at cost:
Land and land interests		$ 1,315,832	$ 1,751,544
Building and improvements		4,168,193	5,154,990
Building leasehold and improvements		1,448,134	1,433,793
Right of use asset - financing leases		55,711	47,445
Right of use asset - operating leases		367,209	396,795
Total commercial real estate properties, at cost		7,355,079	8,784,567
Less: accumulated depreciation		(1,956,077)	(2,060,560)
Total commercial real estate properties, net		5,399,002	6,724,007
Assets held for sale		0	391,664
Cash and cash equivalents		266,059	166,070
Restricted cash		106,736	75,360
Investments in marketable securities		28,570	29,887
Tenant and other receivables		44,507	43,968
Related party receivables		34,657	21,121
Deferred rents receivable		302,791	283,011
Debt and preferred equity investments, net of discounts and deferred origination fees of $11,232 and $14,562 and allowances of $13,213 and $1,750 in 2020 and 2019, respectively		1,076,542	1,580,306
Investments in unconsolidated joint ventures		3,823,322	2,912,842
Deferred costs, net		177,168	205,283
Other assets		448,213	332,801
Total assets	[1]	11,707,567	12,766,320
Liabilities
Mortgages and other loans payable, net		1,979,972	2,183,253
Revolving credit facility, net		105,262	234,013
Unsecured term loans, net		1,495,275	1,494,024
Unsecured notes, net		1,248,219	1,496,847
Accrued interest payable		14,825	22,148
Other liabilities		302,798	177,080
Accounts payable and accrued expenses		151,309	166,905
Deferred revenue		118,572	114,052
Lease liability - financing leases		152,521	44,448
Lease liability - operating leases		339,458	381,671
Dividend and distributions payable		149,294	79,282
Security deposits		53,836	62,252
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	[1]	6,211,341	6,555,975
Commitments and contingencies
Noncontrolling interests in Operating Partnership		358,262	409,862
Preferred units		202,169	283,285
Equity
Series I Preferred Stock, $0.01 par value, $25.00 liquidation preference, 9,200 issued and outstanding at both December 31, 2020 and 2019		221,932	221,932
Common stock, $0.01 par value, 160,000 shares authorized and 69,534 and 77,981 issued and outstanding at December 31, 2020 and 2019, respectively (including 1,026 and 1,026 shares held in treasury at December 31, 2020 and 2019, respectively)		716	803
Additional paid-in-capital		3,862,949	4,286,395
Treasury stock at cost		(124,049)	(124,049)
Accumulated other comprehensive loss		(67,247)	(28,485)
Retained earnings		1,015,462	1,084,719
Total SL Green stockholders' equity		4,909,763	5,441,315
Noncontrolling interests in other partnerships		26,032	75,883
Total equity		4,935,795	5,517,198
SL Green stockholders equity:
Total liabilities and equity/capital		$ 11,707,567	$ 12,766,320
Preferred stock, par (in dollars per share)		$ 0.01
Series I Preferred Stock
SL Green stockholders equity:
Preferred stock, par (in dollars per share)		0.01	$ 0.01
Preferred stock, liquidation preference (in dollars per share)		$ 25.00	$ 25.00
SL Green Operating Partnership
Commercial real estate properties, at cost:
Land and land interests		$ 1,315,832	$ 1,751,544
Building and improvements		4,168,193	5,154,990
Building leasehold and improvements		1,448,134	1,433,793
Right of use asset - financing leases		55,711	47,445
Right of use asset - operating leases		367,209	396,795
Total commercial real estate properties, at cost		7,355,079	8,784,567
Less: accumulated depreciation		(1,956,077)	(2,060,560)
Total commercial real estate properties, net		5,399,002	6,724,007
Assets held for sale		0	391,664
Cash and cash equivalents		266,059	166,070
Restricted cash		106,736	75,360
Investments in marketable securities		28,570	29,887
Tenant and other receivables		44,507	43,968
Related party receivables		34,657	21,121
Deferred rents receivable		302,791	283,011
Debt and preferred equity investments, net of discounts and deferred origination fees of $11,232 and $14,562 and allowances of $13,213 and $1,750 in 2020 and 2019, respectively		1,076,542	1,580,306
Investments in unconsolidated joint ventures			2,912,842
Deferred costs, net		177,168	205,283
Other assets		448,213	332,801
Total assets	[2]	11,707,567	12,766,320
Liabilities
Mortgages and other loans payable, net		1,979,972	2,183,253
Revolving credit facility, net		105,262	234,013
Unsecured term loans, net		1,495,275	1,494,024
Unsecured notes, net		1,248,219	1,496,847
Accrued interest payable		14,825	22,148
Other liabilities		302,798	177,080
Accounts payable and accrued expenses		151,309	166,905
Deferred revenue		118,572	114,052
Lease liability - financing leases		152,521	44,448
Lease liability - operating leases		339,458	381,671
Dividend and distributions payable		149,294	79,282
Security deposits		53,836	62,252
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]	6,211,341	6,555,975
Commitments and contingencies
Limited partner interests in SLGOP (3,939 and 4,196 limited partner common units outstanding at December 31, 2020 and 2019, respectively)		358,262	409,862
Preferred units		202,169	283,285
Equity
Accumulated other comprehensive loss		(67,247)	(28,485)
SL Green stockholders equity:
Series I Preferred Units, $25.00 liquidation preference, 9,200 issued and outstanding at both December 31, 2020 and 2019		221,932	221,932
SL Green partners' capital (724 and 812 general partner common units, and 67,784 and 76,145 limited partner common units outstanding at December 31, 2020 and 2019, respectively)		4,755,078	5,247,868
Total SLGOP partners' capital		4,909,763	5,441,315
Noncontrolling interests in other partnerships		26,032	75,883
Total capital		4,935,795	5,517,198
Total liabilities and equity/capital		$ 11,707,567	$ 12,766,320
SL Green Operating Partnership | Series I Preferred Stock
SL Green stockholders equity:
Preferred units, shares issued (in shares)		9,200	9,200
Service Corporation
Commercial real estate properties, at cost:
Land and land interests		$ 41,200	$ 205,200
Building and improvements		57,900	481,900
Building leasehold and improvements		2,000	2,000
Right of use asset - financing leases		37,800	61,700
Less: accumulated depreciation		(10,300)	(17,600)
Other assets		289,500	169,500
Liabilities
Mortgages and other loans payable, net		94,000	457,100
Accrued interest payable		700	1,200
Other liabilities		56,600	43,700
Lease liability - financing leases		$ 29,900	$ 57,700

[1] (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: $41.2 million and $205.2 million of land, $57.9 million and $481.9 million of building and improvements, $2.0 million and $2.0 million of building and leasehold improvements, $37.8 million and $61.7 million of right of use assets, $10.3 million and $17.6 million of accumulated depreciation, $289.5 million and $169.5 million of other assets included in other line items, $94.0 million and $457.1 million of real estate debt, net, $0.7 million and $1.2 million of accrued interest payable, $29.9 million and $57.7 million of lease liabilities, and $56.6 million and $43.7 million of other liabilities included in other line items as of December 31, 2020 and December 31, 2019, respectively.

[2] (1) 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: $41.2 million and $205.2 million of land, $57.9 million and $481.9 million of building and improvements, $2.0 million and $2.0 million of building and leasehold improvements, $37.8 million and $61.7 million of right of use assets, $10.3 million and $17.6 million of accumulated depreciation, $289.5 million and $169.5 million of other assets included in other line items, $94.0 million and $457.1 million of real estate debt, net, $0.7 million and $1.2 million of accrued interest payable, $29.9 million and $57.7 million of lease liabilities, and $56.6 million and $43.7 million of other liabilities included in other line items as of December 31, 2020 and December 31, 2019, respectively.