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Schedule III - Real Estate and Accumulated Depreciation Schedule of Real Estate and Accumulated Depreciation (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | $ 605,542 |  |  |
Initial Cost to the Company |  |  |  |
Land and Development Costs | 199,287 |  |  |
Building & Improvements | 918,018 |  |  |
Cost Capitalized Subsequent to Acquisition |  |  |  |
Improvements | 1,992,128 |  |  |
Gross Amount at which Carried |  |  |  |
Land and Development Costs | 209,185 |  |  |
Buildings & Improvements | 2,900,248 |  |  |
Total | 3,109,433 | $ 2,884,486 | $ 2,667,655 | $ 2,458,629
Accumulated Depreciation | (862,534) | $ (747,304) | $ (656,900) | $ (556,546)
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 | 124,153 |  |  |
Gross Amount at which Carried |  |  |  |
Land and Development Costs | 13,630 |  |  |
Buildings & Improvements | 368,614 |  |  |
Total | 382,244 |  |  |
Accumulated Depreciation | (54,356) |  |  |
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 | 76,764 |  |  |
Gross Amount at which Carried |  |  |  |
Land and Development Costs | 0 |  |  |
Buildings & Improvements | 173,102 |  |  |
Total | 173,102 |  |  |
Accumulated Depreciation | (37,745) |  |  |
1333 Broadway, New York, NY | office/ retail |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 158,617 |  |  |
Initial Cost to the Company |  |  |  |
Land and Development Costs | 91,435 |  |  |
Building & Improvements | 120,190 |  |  |
Cost Capitalized Subsequent to Acquisition |  |  |  |
Improvements | 9,434 |  |  |
Gross Amount at which Carried |  |  |  |
Land and Development Costs | 91,435 |  |  |
Buildings & Improvements | 129,624 |  |  |
Total | 221,059 |  |  |
Accumulated Depreciation | (25,483) |  |  |
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 | 32,818 |  |  |
Gross Amount at which Carried |  |  |  |
Land and Development Costs | 0 |  |  |
Buildings & Improvements | 135,336 |  |  |
Total | 135,336 |  |  |
Accumulated Depreciation | (32,584) |  |  |
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 | 0 |  |  |
Initial Cost to the Company |  |  |  |
Land and Development Costs | 2,117 |  |  |
Building & Improvements | 5,041 |  |  |
Cost Capitalized Subsequent to Acquisition |  |  |  |
Improvements | 153,241 |  |  |
Gross Amount at which Carried |  |  |  |
Land and Development Costs | 2,117 |  |  |
Buildings & Improvements | 158,282 |  |  |
Total | 160,399 |  |  |
Accumulated Depreciation | (42,521) |  |  |
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 | 94,547 |  |  |
Gross Amount at which Carried |  |  |  |
Land and Development Costs | 1,100 |  |  |
Buildings & Improvements | 97,147 |  |  |
Total | 98,247 |  |  |
Accumulated Depreciation | (40,924) |  |  |
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 | 59,570 |  |  |
Gross Amount at which Carried |  |  |  |
Land and Development Costs | 1,233 |  |  |
Buildings & Improvements | 61,379 |  |  |
Total | 62,612 |  |  |
Accumulated Depreciation | (29,437) |  |  |
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 | 994,622 |  |  |
Gross Amount at which Carried |  |  |  |
Land and Development Costs | 21,551 |  |  |
Buildings & Improvements | 1,033,556 |  |  |
Total | 1,055,107 |  |  |
Accumulated Depreciation | (262,236) |  |  |
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 | 266,090 |  |  |
Gross Amount at which Carried |  |  |  |
Land and Development Costs | 7,222 |  |  |
Buildings & Improvements | 283,598 |  |  |
Total | 290,820 |  |  |
Accumulated Depreciation | (119,574) |  |  |
First Stamford Place, Stamford, CT | office |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 178,820 |  |  |
Initial Cost to the Company |  |  |  |
Land and Development Costs | 22,952 |  |  |
Building & Improvements | 122,739 |  |  |
Cost Capitalized Subsequent to Acquisition |  |  |  |
Improvements | 73,243 |  |  |
Gross Amount at which Carried |  |  |  |
Land and Development Costs | 24,862 |  |  |
Buildings & Improvements | 194,072 |  |  |
Total | 218,934 |  |  |
Accumulated Depreciation | (86,636) |  |  |
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 | 89,474 |  |  |
Initial Cost to the Company |  |  |  |
Land and Development Costs | 5,313 |  |  |
Building & Improvements | 28,602 |  |  |
Cost Capitalized Subsequent to Acquisition |  |  |  |
Improvements | 18,876 |  |  |
Gross Amount at which Carried |  |  |  |
Land and Development Costs | 5,313 |  |  |
Buildings & Improvements | 47,478 |  |  |
Total | 52,791 |  |  |
Accumulated Depreciation | (32,379) |  |  |
383 Main Avenue, Norwalk, CT | office |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 29,647 |  |  |
Initial Cost to the Company |  |  |  |
Land and Development Costs | 2,262 |  |  |
Building & Improvements | 12,820 |  |  |
Cost Capitalized Subsequent to Acquisition |  |  |  |
Improvements | 28,083 |  |  |
Gross Amount at which Carried |  |  |  |
Land and Development Costs | 2,262 |  |  |
Buildings & Improvements | 40,903 |  |  |
Total | 43,165 |  |  |
Accumulated Depreciation | (14,815) |  |  |
500 Mamaroneck Avenue, Harrison, NY | office |  |  |  |
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 | 4,571 |  |  |
Building & Improvements | 25,915 |  |  |
Cost Capitalized Subsequent to Acquisition |  |  |  |
Improvements | 24,723 |  |  |
Gross Amount at which Carried |  |  |  |
Land and Development Costs | 4,571 |  |  |
Buildings & Improvements | 50,638 |  |  |
Total | 55,209 |  |  |
Accumulated Depreciation | (24,714) |  |  |
10 Bank Street, White Plains, NY | office |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 32,496 |  |  |
Initial Cost to the Company |  |  |  |
Land and Development Costs | 5,612 |  |  |
Building & Improvements | 31,803 |  |  |
Cost Capitalized Subsequent to Acquisition |  |  |  |
Improvements | 19,699 |  |  |
Gross Amount at which Carried |  |  |  |
Land and Development Costs | 5,612 |  |  |
Buildings & Improvements | 51,502 |  |  |
Total | 57,114 |  |  |
Accumulated Depreciation | (23,557) |  |  |
10 Union Square, New York, NY | retail |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 49,252 |  |  |
Initial Cost to the Company |  |  |  |
Land and Development Costs | 5,003 |  |  |
Building & Improvements | 12,866 |  |  |
Cost Capitalized Subsequent to Acquisition |  |  |  |
Improvements | 2,363 |  |  |
Gross Amount at which Carried |  |  |  |
Land and Development Costs | 5,003 |  |  |
Buildings & Improvements | 15,229 |  |  |
Total | 20,232 |  |  |
Accumulated Depreciation | (8,245) |  |  |
1542 Third Avenue, New York, NY | retail |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 29,532 |  |  |
Initial Cost to the Company |  |  |  |
Land and Development Costs | 2,239 |  |  |
Building & Improvements | 15,266 |  |  |
Cost Capitalized Subsequent to Acquisition |  |  |  |
Improvements | 449 |  |  |
Gross Amount at which Carried |  |  |  |
Land and Development Costs | 2,239 |  |  |
Buildings & Improvements | 15,715 |  |  |
Total | 17,954 |  |  |
Accumulated Depreciation | (8,210) |  |  |
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 | 37,704 |  |  |
Initial Cost to the Company |  |  |  |
Land and Development Costs | 4,462 |  |  |
Building & Improvements | 15,817 |  |  |
Cost Capitalized Subsequent to Acquisition |  |  |  |
Improvements | 1,173 |  |  |
Gross Amount at which Carried |  |  |  |
Land and Development Costs | 4,462 |  |  |
Buildings & Improvements | 16,990 |  |  |
Total | 21,452 |  |  |
Accumulated Depreciation | (9,037) |  |  |
69-97 Main Street, Westport, CT | 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 | 3,933 |  |  |
Gross Amount at which Carried |  |  |  |
Land and Development Costs | 2,782 |  |  |
Buildings & Improvements | 19,699 |  |  |
Total | 22,481 |  |  |
Accumulated Depreciation | (7,542) |  |  |
103-107 Main Street, Westport, CT | 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 | 358 |  |  |
Gross Amount at which Carried |  |  |  |
Land and Development Costs | 1,260 |  |  |
Buildings & Improvements | 7,384 |  |  |
Total | 8,644 |  |  |
Accumulated Depreciation | (2,539) |  |  |
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 | 4,542 |  |  |
Building & Improvements | 0 |  |  |
Cost Capitalized Subsequent to Acquisition |  |  |  |
Improvements | 7,989 |  |  |
Gross Amount at which Carried |  |  |  |
Land and Development Costs | 12,531 |  |  |
Buildings & Improvements | 0 |  |  |
Total | 12,531 |  |  |
Accumulated Depreciation | $ 0 |  |  |

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