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Schedule III - Real Estate and Accumulated Depreciation (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 1,941,360      
Initial Cost        
Land 1,336,041      
Building & Improvements 5,305,161      
Cost Capitalized Subsequent To Acquisition        
Land (20,207)      
Building & Improvements 734,086      
Gross Amount at Which Carried at Close of Period        
Land 1,315,832      
Building & Improvements (3) 6,039,247      
Total 7,355,079 $ 8,784,567 $ 8,513,935 $ 10,206,122
Accumulated Depreciation 1,956,077 $ 2,060,560 $ 2,099,137 $ 2,300,116
420 Lexington Avenue        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 294,035      
Initial Cost        
Land 0      
Building & Improvements 333,499      
Cost Capitalized Subsequent To Acquisition        
Land 0      
Building & Improvements 201,776      
Gross Amount at Which Carried at Close of Period        
Land 0      
Building & Improvements (3) 535,275      
Total 535,275      
Accumulated Depreciation 166,886      
711 Third Avenue        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost        
Land 19,844      
Building & Improvements 115,769      
Cost Capitalized Subsequent To Acquisition        
Land 0      
Building & Improvements 69,098      
Gross Amount at Which Carried at Close of Period        
Land 19,844      
Building & Improvements (3) 184,867      
Total 204,711      
Accumulated Depreciation 61,237      
555 W. 57th Street        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost        
Land 18,846      
Building & Improvements 140,946      
Cost Capitalized Subsequent To Acquisition        
Land 0      
Building & Improvements 1,600      
Gross Amount at Which Carried at Close of Period        
Land 18,846      
Building & Improvements (3) 142,546      
Total 161,392      
Accumulated Depreciation 81,420      
East 220 Street 42        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 510,000      
Initial Cost        
Land 51,008      
Building & Improvements 203,727      
Cost Capitalized Subsequent To Acquisition        
Land 0      
Building & Improvements 183,461      
Gross Amount at Which Carried at Close of Period        
Land 51,008      
Building & Improvements (3) 387,188      
Total 438,196      
Accumulated Depreciation 137,153      
461 Fifth Avenue        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost        
Land 0      
Building & Improvements 88,276      
Cost Capitalized Subsequent To Acquisition        
Land 0      
Building & Improvements 35,988      
Gross Amount at Which Carried at Close of Period        
Land 0      
Building & Improvements (3) 124,264      
Total 124,264      
Accumulated Depreciation 36,758      
750 Third Avenue        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost        
Land 51,093      
Building & Improvements 251,523      
Cost Capitalized Subsequent To Acquisition        
Land 0      
Building & Improvements (2,288)      
Gross Amount at Which Carried at Close of Period        
Land 51,093      
Building & Improvements (3) 249,235      
Total 300,328      
Accumulated Depreciation 109,824      
625 Madison Avenue        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost        
Land 0      
Building & Improvements 291,319      
Cost Capitalized Subsequent To Acquisition        
Land 0      
Building & Improvements 37,997      
Gross Amount at Which Carried at Close of Period        
Land 0      
Building & Improvements (3) 329,316      
Total 329,316      
Accumulated Depreciation 139,403      
485 Lexington Avenue        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 450,000      
Initial Cost        
Land 78,282      
Building & Improvements 452,631      
Cost Capitalized Subsequent To Acquisition        
Land 0      
Building & Improvements (22,346)      
Gross Amount at Which Carried at Close of Period        
Land 78,282      
Building & Improvements (3) 430,285      
Total 508,567      
Accumulated Depreciation 173,769      
609 Fifth Avenue        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 57,651      
Initial Cost        
Land 16,869      
Building & Improvements 107,185      
Cost Capitalized Subsequent To Acquisition        
Land 0      
Building & Improvements 53,002      
Gross Amount at Which Carried at Close of Period        
Land 16,869      
Building & Improvements (3) 160,187      
Total 177,056      
Accumulated Depreciation 19,881      
810 Seventh Avenue        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost        
Land 114,077      
Building & Improvements 550,819      
Cost Capitalized Subsequent To Acquisition        
Land 0      
Building & Improvements 3,390      
Gross Amount at Which Carried at Close of Period        
Land 114,077      
Building & Improvements (3) 554,209      
Total 668,286      
Accumulated Depreciation 205,774      
1185 Avenue of the Americas        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost        
Land 0      
Building & Improvements 791,106      
Cost Capitalized Subsequent To Acquisition        
Land 0      
Building & Improvements 123,470      
Gross Amount at Which Carried at Close of Period        
Land 0      
Building & Improvements (3) 914,576      
Total 914,576      
Accumulated Depreciation 320,735      
1350 Avenue of the Americas        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost        
Land 90,941      
Building & Improvements 431,517      
Cost Capitalized Subsequent To Acquisition        
Land 0      
Building & Improvements (2,431)      
Gross Amount at Which Carried at Close of Period        
Land 90,941      
Building & Improvements (3) 429,086      
Total 520,027      
Accumulated Depreciation 155,186      
1-6 Landmark Square        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 100,000      
Initial Cost        
Land 27,852      
Building & Improvements 161,343      
Cost Capitalized Subsequent To Acquisition        
Land (6,939)      
Building & Improvements (40,256)      
Gross Amount at Which Carried at Close of Period        
Land 20,913      
Building & Improvements (3) 121,087      
Total 142,000      
Accumulated Depreciation 32,099      
7 Landmark Square        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost        
Land 1,721      
Building & Improvements 8,417      
Cost Capitalized Subsequent To Acquisition        
Land (1,338)      
Building & Improvements (6,240)      
Gross Amount at Which Carried at Close of Period        
Land 383      
Building & Improvements (3) 2,177      
Total 2,560      
Accumulated Depreciation 426      
100 Church Street        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 204,875      
Initial Cost        
Land 34,994      
Building & Improvements 183,932      
Cost Capitalized Subsequent To Acquisition        
Land 0      
Building & Improvements 11,391      
Gross Amount at Which Carried at Close of Period        
Land 34,994      
Building & Improvements (3) 195,323      
Total 230,317      
Accumulated Depreciation 65,763      
125 Park Avenue        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost        
Land 120,900      
Building & Improvements 270,598      
Cost Capitalized Subsequent To Acquisition        
Land 0      
Building & Improvements 12,499      
Gross Amount at Which Carried at Close of Period        
Land 120,900      
Building & Improvements (3) 283,097      
Total 403,997      
Accumulated Depreciation 99,736      
110 East 42nd Street        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost        
Land 36,196      
Building & Improvements 78,353      
Cost Capitalized Subsequent To Acquisition        
Land (2,334)      
Building & Improvements 1,068      
Gross Amount at Which Carried at Close of Period        
Land 33,862      
Building & Improvements (3) 79,421      
Total 113,283      
Accumulated Depreciation 24,330      
304 Park Avenue        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost        
Land 54,489      
Building & Improvements 90,643      
Cost Capitalized Subsequent To Acquisition        
Land 0      
Building & Improvements 1,484      
Gross Amount at Which Carried at Close of Period        
Land 54,489      
Building & Improvements (3) 92,127      
Total 146,616      
Accumulated Depreciation 23,428      
635 Sixth Avenue        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost        
Land 24,343      
Building & Improvements 88,261      
Cost Capitalized Subsequent To Acquisition        
Land 0      
Building & Improvements 95      
Gross Amount at Which Carried at Close of Period        
Land 24,343      
Building & Improvements (3) 88,356      
Total 112,699      
Accumulated Depreciation 17,412      
641 Sixth Avenue        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost        
Land 45,976      
Building & Improvements 77,076      
Cost Capitalized Subsequent To Acquisition        
Land 0      
Building & Improvements 355      
Gross Amount at Which Carried at Close of Period        
Land 45,976      
Building & Improvements (3) 77,431      
Total 123,407      
Accumulated Depreciation 21,231      
1080 Amsterdam        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 34,773      
Initial Cost        
Land 0      
Building & Improvements 47,948      
Cost Capitalized Subsequent To Acquisition        
Land 0      
Building & Improvements 10,327      
Gross Amount at Which Carried at Close of Period        
Land 0      
Building & Improvements (3) 58,275      
Total 58,275      
Accumulated Depreciation $ 7,937      
1080 Amsterdam | 1080 Amsterdam        
Gross Amount at Which Carried at Close of Period        
Interest in property (as a percent) 92.50%      
752-760 Madison Avenue        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost        
Land 284,286      
Building & Improvements 8,314      
Cost Capitalized Subsequent To Acquisition        
Land 6,153      
Building & Improvements 29,133      
Gross Amount at Which Carried at Close of Period        
Land 290,439      
Building & Improvements (3) 37,447      
Total 327,886      
Accumulated Depreciation 5,392      
719 Seventh Avenue        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 50,000      
Initial Cost        
Land 41,180      
Building & Improvements 46,232      
Cost Capitalized Subsequent To Acquisition        
Land 0      
Building & Improvements (4,750)      
Gross Amount at Which Carried at Close of Period        
Land 41,180      
Building & Improvements (3) 41,482      
Total 82,662      
Accumulated Depreciation $ 2,323      
719 Seventh Avenue | 719 Seventh Avenue        
Gross Amount at Which Carried at Close of Period        
Interest in property (as a percent) 75.00%      
110 Greene Street        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost        
Land 45,120      
Building & Improvements 228,393      
Cost Capitalized Subsequent To Acquisition        
Land 0      
Building & Improvements 3,034      
Gross Amount at Which Carried at Close of Period        
Land 45,120      
Building & Improvements (3) 231,427      
Total 276,547      
Accumulated Depreciation 36,767      
185 Broadway        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 158,478      
Initial Cost        
Land 45,540      
Building & Improvements 27,865      
Cost Capitalized Subsequent To Acquisition        
Land 0      
Building & Improvements 111,462      
Gross Amount at Which Carried at Close of Period        
Land 45,540      
Building & Improvements (3) 139,327      
Total 184,867      
Accumulated Depreciation 419      
113 Greene Street        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 15,523      
Initial Cost        
Land 3,446      
Building & Improvements 27,542      
Cost Capitalized Subsequent To Acquisition        
Land (1,563)      
Building & Improvements (12,377)      
Gross Amount at Which Carried at Close of Period        
Land 1,883      
Building & Improvements (3) 15,165      
Total 17,048      
Accumulated Depreciation 1,526      
712 Madison Avenue        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 28,000      
Initial Cost        
Land 7,207      
Building & Improvements 47,397      
Cost Capitalized Subsequent To Acquisition        
Land (7,207)      
Building & Improvements (47,397)      
Gross Amount at Which Carried at Close of Period        
Land 0      
Building & Improvements (3) 0      
Total 0      
Accumulated Depreciation 0      
106 Spring Street        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 38,025      
Initial Cost        
Land 14,173      
Building & Improvements 66,052      
Cost Capitalized Subsequent To Acquisition        
Land (6,979)      
Building & Improvements (32,335)      
Gross Amount at Which Carried at Close of Period        
Land 7,194      
Building & Improvements (3) 33,717      
Total 40,911      
Accumulated Depreciation 2,911      
707 Eleventh Avenue        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost        
Land 66,237      
Building & Improvements 20,874      
Cost Capitalized Subsequent To Acquisition        
Land 0      
Building & Improvements 10,442      
Gross Amount at Which Carried at Close of Period        
Land 66,237      
Building & Improvements (3) 31,316      
Total 97,553      
Accumulated Depreciation 0      
590 Fifth Avenue        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost        
Land 39,685      
Building & Improvements 51,380      
Cost Capitalized Subsequent To Acquisition        
Land 0      
Building & Improvements 3,193      
Gross Amount at Which Carried at Close of Period        
Land 39,685      
Building & Improvements (3) 54,573      
Total 94,258      
Accumulated Depreciation 657      
Other        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost        
Land 1,734      
Building & Improvements 16,224      
Cost Capitalized Subsequent To Acquisition        
Land 0      
Building & Improvements 241      
Gross Amount at Which Carried at Close of Period        
Land 1,734      
Building & Improvements (3) 16,465      
Total 18,199      
Accumulated Depreciation $ 5,694