Schedule III - Real Estate and Accumulated Depreciation (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	$ 1,947,474
Initial Cost
Land	1,504,523
Building & Improvements	4,645,400
Cost Capitalized Subsequent To Acquisition
Land	(147,482)
Building & Improvements	605,300
Gross Amount at Which Carried at Close of Period
Land	1,357,041
Building & Improvements	5,250,700
Total	6,607,741	$ 6,102,864	$ 9,198,799	$ 7,650,907
Accumulated Depreciation	2,126,081	$ 1,968,004	$ 2,039,554	$ 1,896,199
420 Lexington Avenue
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	272,326
Initial Cost
Land	0
Building & Improvements	333,499
Cost Capitalized Subsequent To Acquisition
Land	0
Building & Improvements	79,607
Gross Amount at Which Carried at Close of Period
Land	0
Building & Improvements	413,106
Total	413,106
Accumulated Depreciation	233,848
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	16,578
Gross Amount at Which Carried at Close of Period
Land	19,844
Building & Improvements	132,347
Total	152,191
Accumulated Depreciation	84,768
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	21,526
Gross Amount at Which Carried at Close of Period
Land	18,846
Building & Improvements	162,472
Total	181,318
Accumulated Depreciation	103,967
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	28,873
Building & Improvements	15,200
Gross Amount at Which Carried at Close of Period
Land	28,873
Building & Improvements	103,476
Total	132,349
Accumulated Depreciation	49,460
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	114,773
Gross Amount at Which Carried at Close of Period
Land	51,093
Building & Improvements	366,296
Total	417,389
Accumulated Depreciation	115,992
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	(4,635)
Gross Amount at Which Carried at Close of Period
Land	78,282
Building & Improvements	447,996
Total	526,278
Accumulated Depreciation	217,606
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	13,809
Gross Amount at Which Carried at Close of Period
Land	114,077
Building & Improvements	564,628
Total	678,705
Accumulated Depreciation	252,324
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	46,785
Gross Amount at Which Carried at Close of Period
Land	0
Building & Improvements	837,891
Total	837,891
Accumulated Depreciation	418,159
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	26,318
Gross Amount at Which Carried at Close of Period
Land	90,941
Building & Improvements	457,835
Total	548,776
Accumulated Depreciation	211,252
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	(13,804)
Gross Amount at Which Carried at Close of Period
Land	20,913
Building & Improvements	147,539
Total	168,452
Accumulated Depreciation	51,883
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	(6,235)
Gross Amount at Which Carried at Close of Period
Land	383
Building & Improvements	2,182
Total	2,565
Accumulated Depreciation	783
100 Church Street
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	370,000
Initial Cost
Land	34,994
Building & Improvements	183,932
Cost Capitalized Subsequent To Acquisition
Land	0
Building & Improvements	16,674
Gross Amount at Which Carried at Close of Period
Land	34,994
Building & Improvements	200,606
Total	235,600
Accumulated Depreciation	84,431
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	30,032
Gross Amount at Which Carried at Close of Period
Land	120,900
Building & Improvements	300,630
Total	421,530
Accumulated Depreciation	139,949
19 East 65th Street
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost
Land	8,603
Building & Improvements	2,074
Cost Capitalized Subsequent To Acquisition
Land	0
Building & Improvements	4,990
Gross Amount at Which Carried at Close of Period
Land	8,603
Building & Improvements	7,064
Total	15,667
Accumulated Depreciation	10
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	12,056
Gross Amount at Which Carried at Close of Period
Land	54,489
Building & Improvements	102,699
Total	157,188
Accumulated Depreciation	36,859
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	(2,748)
Building & Improvements	165,708
Gross Amount at Which Carried at Close of Period
Land	281,538
Building & Improvements	174,022
Total	455,560
Accumulated Depreciation	5,315
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	4,741
Gross Amount at Which Carried at Close of Period
Land	45,120
Building & Improvements	233,134
Total	278,254
Accumulated Depreciation	64,093
7 Dey / 185 Broadway
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	190,148
Initial Cost
Land	45,540
Building & Improvements	27,865
Cost Capitalized Subsequent To Acquisition
Land	0
Building & Improvements	209,670
Gross Amount at Which Carried at Close of Period
Land	45,540
Building & Improvements	237,535
Total	283,075
Accumulated Depreciation	21,860
885 Third Avenue
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost
Land	138,444
Building & Improvements	244,040
Cost Capitalized Subsequent To Acquisition
Land	(138,444)
Building & Improvements	(119,024)
Gross Amount at Which Carried at Close of Period
Land	0
Building & Improvements	125,016
Total	125,016
Accumulated Depreciation	15,506
690 Madison Avenue
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost
Land	13,820
Building & Improvements	51,732
Cost Capitalized Subsequent To Acquisition
Land	(7,985)
Building & Improvements	(27,336)
Gross Amount at Which Carried at Close of Period
Land	5,835
Building & Improvements	24,396
Total	30,231
Accumulated Depreciation	5,132
100 Park Avenue
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	360,000
Initial Cost
Land	230,891
Building & Improvements	133,269
Cost Capitalized Subsequent To Acquisition
Land	0
Building & Improvements	0
Gross Amount at Which Carried at Close of Period
Land	230,891
Building & Improvements	133,269
Total	364,160
Accumulated Depreciation	0
10 East 53rd Street
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	205,000
Initial Cost
Land	104,143
Building & Improvements	62,470
Cost Capitalized Subsequent To Acquisition
Land	0
Building & Improvements	0
Gross Amount at Which Carried at Close of Period
Land	104,143
Building & Improvements	62,470
Total	166,613
Accumulated Depreciation	4,710
Other
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost
Land	20,637
Building & Improvements	16,224
Cost Capitalized Subsequent To Acquisition
Land	(18,901)
Building & Improvements	(2,133)
Gross Amount at Which Carried at Close of Period
Land	1,736
Building & Improvements	14,091
Total	15,827
Accumulated Depreciation	$ 8,174