Schedule III - Real Estate and Accumulated Depreciation - Schedule of Real Estate and Accumulated Depreciation (Details) $ in Thousands	Dec. 31, 2022 USD ($)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	$ 900,630
Initial Cost to the Company
Land and Development Costs	363,441
Building & Improvements	1,097,752
Cost Capitalized Subsequent to Acquisition
Improvements	2,090,256
Gross Amount at which Carried
Land and Development Costs	373,706
Buildings & Improvements	3,177,743
Total	3,551,449
Accumulated Depreciation	1,137,267
111 West 33rd Street, New York, NY | office/ retail
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to the Company
Land and Development Costs	13,630
Building & Improvements	244,461
Cost Capitalized Subsequent to Acquisition
Improvements	129,400
Gross Amount at which Carried
Land and Development Costs	13,630
Buildings & Improvements	373,861
Total	387,491
Accumulated Depreciation	102,821
1400 Broadway | office/ retail
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to the Company
Land and Development Costs	0
Building & Improvements	96,338
Cost Capitalized Subsequent to Acquisition
Improvements	99,511
Gross Amount at which Carried
Land and Development Costs	0
Buildings & Improvements	195,849
Total	195,849
Accumulated Depreciation	62,721
1333 Broadway, New York, NY | office/ retail
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	160,000
Initial Cost to the Company
Land and Development Costs	91,435
Building & Improvements	120,189
Cost Capitalized Subsequent to Acquisition
Improvements	13,505
Gross Amount at which Carried
Land and Development Costs	91,435
Buildings & Improvements	133,694
Total	225,129
Accumulated Depreciation	38,766
1350 Broadway, New York, NY | office/ retail
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to the Company
Land and Development Costs	0
Building & Improvements	102,518
Cost Capitalized Subsequent to Acquisition
Improvements	43,218
Gross Amount at which Carried
Land and Development Costs	0
Buildings & Improvements	145,736
Total	145,736
Accumulated Depreciation	47,750
250 West 57th Street, New York, NY | office/ retail
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	180,000
Initial Cost to the Company
Land and Development Costs	2,117
Building & Improvements	5,041
Cost Capitalized Subsequent to Acquisition
Improvements	173,858
Gross Amount at which Carried
Land and Development Costs	2,117
Buildings & Improvements	178,899
Total	181,016
Accumulated Depreciation	66,939
501 Seventh Avenue, New York, NY | office/ retail
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to the Company
Land and Development Costs	1,100
Building & Improvements	2,600
Cost Capitalized Subsequent to Acquisition
Improvements	102,027
Gross Amount at which Carried
Land and Development Costs	1,100
Buildings & Improvements	104,627
Total	105,727
Accumulated Depreciation	53,647
1359 Broadway, New York, NY | office/ retail
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to the Company
Land and Development Costs	1,233
Building & Improvements	1,809
Cost Capitalized Subsequent to Acquisition
Improvements	70,051
Gross Amount at which Carried
Land and Development Costs	1,233
Buildings & Improvements	71,860
Total	73,093
Accumulated Depreciation	28,960
350 Fifth Avenue (Empire State Building), New York, NY | office/ retail
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to the Company
Land and Development Costs	21,551
Building & Improvements	38,934
Cost Capitalized Subsequent to Acquisition
Improvements	1,022,237
Gross Amount at which Carried
Land and Development Costs	21,551
Buildings & Improvements	1,061,170
Total	1,082,721
Accumulated Depreciation	392,159
One Grand Central Place, New York, NY | office/ retail
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to the Company
Land and Development Costs	7,240
Building & Improvements	17,490
Cost Capitalized Subsequent to Acquisition
Improvements	293,122
Gross Amount at which Carried
Land and Development Costs	7,222
Buildings & Improvements	310,630
Total	317,852
Accumulated Depreciation	152,636
First Stamford Place, Stamford, CT | office
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	178,823
Initial Cost to the Company
Land and Development Costs	22,952
Building & Improvements	122,738
Cost Capitalized Subsequent to Acquisition
Improvements	80,128
Gross Amount at which Carried
Land and Development Costs	24,860
Buildings & Improvements	200,958
Total	225,818
Accumulated Depreciation	105,519
One Station Place, Stamford, CT (Metro Center) | office
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	82,596
Initial Cost to the Company
Land and Development Costs	5,313
Building & Improvements	28,602
Cost Capitalized Subsequent to Acquisition
Improvements	36,575
Gross Amount at which Carried
Land and Development Costs	5,313
Buildings & Improvements	65,177
Total	70,490
Accumulated Depreciation	37,901
10 Union Square, New York, NY | retail
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	50,000
Initial Cost to the Company
Land and Development Costs	5,003
Building & Improvements	12,866
Cost Capitalized Subsequent to Acquisition
Improvements	5,574
Gross Amount at which Carried
Land and Development Costs	5,003
Buildings & Improvements	18,440
Total	23,443
Accumulated Depreciation	9,444
1542 Third Avenue, New York, NY | retail
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	30,000
Initial Cost to the Company
Land and Development Costs	2,239
Building & Improvements	15,266
Cost Capitalized Subsequent to Acquisition
Improvements	467
Gross Amount at which Carried
Land and Development Costs	2,239
Buildings & Improvements	15,733
Total	17,972
Accumulated Depreciation	9,511
1010 Third Avenue, New York, NY and 77 West 55th Street, New York, NY | retail
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	35,831
Initial Cost to the Company
Land and Development Costs	4,462
Building & Improvements	15,819
Cost Capitalized Subsequent to Acquisition
Improvements	2,821
Gross Amount at which Carried
Land and Development Costs	4,462
Buildings & Improvements	18,640
Total	23,102
Accumulated Depreciation	10,457
69-97 Main Street, Westport, CT (1) | retail
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to the Company
Land and Development Costs	2,782
Building & Improvements	15,766
Cost Capitalized Subsequent to Acquisition
Improvements	6,862
Gross Amount at which Carried
Land and Development Costs	2,782
Buildings & Improvements	22,628
Total	25,410
Accumulated Depreciation	9,441
103-107 Main Street, Westport, CT (1) | retail
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to the Company
Land and Development Costs	1,243
Building & Improvements	7,043
Cost Capitalized Subsequent to Acquisition
Improvements	371
Gross Amount at which Carried
Land and Development Costs	1,260
Buildings & Improvements	7,397
Total	8,657
Accumulated Depreciation	3,184
345 E 94th Street NY | multi-family
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	51,465
Initial Cost to the Company
Land and Development Costs	44,228
Building & Improvements	55,766
Cost Capitalized Subsequent to Acquisition
Improvements	1,044
Gross Amount at which Carried
Land and Development Costs	44,228
Buildings & Improvements	56,811
Total	101,039
Accumulated Depreciation	1,698
Victory 561 10th Ave NY | multi-family
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	131,915
Initial Cost to the Company
Land and Development Costs	91,437
Building & Improvements	124,997
Cost Capitalized Subsequent to Acquisition
Improvements	804
Gross Amount at which Carried
Land and Development Costs	91,437
Buildings & Improvements	125,801
Total	217,238
Accumulated Depreciation	3,713
298 Mulberry, New York, NY | multi-family
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to the Company
Land and Development Costs	40,935
Building & Improvements	69,509
Cost Capitalized Subsequent to Acquisition
Improvements	514
Gross Amount at which Carried
Land and Development Costs	41,126
Buildings & Improvements	69,832
Total	110,958
Accumulated Depreciation	0
Property for development at the Transportation Hub in Stamford, CT | land
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to the Company
Land and Development Costs	4,541
Building & Improvements	0
Cost Capitalized Subsequent to Acquisition
Improvements	8,167
Gross Amount at which Carried
Land and Development Costs	12,708
Buildings & Improvements	0
Total	12,708
Accumulated Depreciation	$ 0