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Schedule III - Real Estate and Accumulated Depreciation Schedule of Real Estate and Accumulated Depreciation (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | $ 608,567 |  |  |
Initial Cost to the Company |  |  |  |
Land | 199,287 |  |  |
Building & Improvements | 918,018 |  |  |
Cost Capitalized Subsequent to Acquisition |  |  |  |
Improvements | 1,767,181 |  |  |
Gross Amount at which Carried |  |  |  |
Land | 209,183 |  |  |
Buildings & Improvements | 2,675,303 |  |  |
Total | 2,884,486 | $ 2,667,655 | $ 2,458,629 | $ 2,276,330
Accumulated Depreciation | (747,304) | $ (656,900) | $ (556,546) | $ (465,584)
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 | 13,630 |  |  |
Building & Improvements | 244,461 |  |  |
Cost Capitalized Subsequent to Acquisition |  |  |  |
Improvements | 106,780 |  |  |
Gross Amount at which Carried |  |  |  |
Land | 13,630 |  |  |
Buildings & Improvements | 351,241 |  |  |
Total | 364,871 |  |  |
Accumulated Depreciation | (41,629) |  |  |
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 | 0 |  |  |
Building & Improvements | 96,338 |  |  |
Cost Capitalized Subsequent to Acquisition |  |  |  |
Improvements | 40,261 |  |  |
Gross Amount at which Carried |  |  |  |
Land | 0 |  |  |
Buildings & Improvements | 136,599 |  |  |
Total | 136,599 |  |  |
Accumulated Depreciation | (31,601) |  |  |
1333 Broadway, New York, NY | office/ retail |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 158,484 |  |  |
Initial Cost to the Company |  |  |  |
Land | 91,435 |  |  |
Building & Improvements | 120,190 |  |  |
Cost Capitalized Subsequent to Acquisition |  |  |  |
Improvements | 7,491 |  |  |
Gross Amount at which Carried |  |  |  |
Land | 91,435 |  |  |
Buildings & Improvements | 127,681 |  |  |
Total | 219,116 |  |  |
Accumulated Depreciation | (22,331) |  |  |
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 | 0 |  |  |
Building & Improvements | 102,518 |  |  |
Cost Capitalized Subsequent to Acquisition |  |  |  |
Improvements | 27,161 |  |  |
Gross Amount at which Carried |  |  |  |
Land | 0 |  |  |
Buildings & Improvements | 129,679 |  |  |
Total | 129,679 |  |  |
Accumulated Depreciation | (25,312) |  |  |
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 | 2,117 |  |  |
Building & Improvements | 5,041 |  |  |
Cost Capitalized Subsequent to Acquisition |  |  |  |
Improvements | 141,581 |  |  |
Gross Amount at which Carried |  |  |  |
Land | 2,117 |  |  |
Buildings & Improvements | 146,622 |  |  |
Total | 148,739 |  |  |
Accumulated Depreciation | (36,058) |  |  |
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 | 1,100 |  |  |
Building & Improvements | 2,600 |  |  |
Cost Capitalized Subsequent to Acquisition |  |  |  |
Improvements | 94,778 |  |  |
Gross Amount at which Carried |  |  |  |
Land | 1,100 |  |  |
Buildings & Improvements | 97,378 |  |  |
Total | 98,478 |  |  |
Accumulated Depreciation | (43,164) |  |  |
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 | 1,233 |  |  |
Building & Improvements | 1,809 |  |  |
Cost Capitalized Subsequent to Acquisition |  |  |  |
Improvements | 57,938 |  |  |
Gross Amount at which Carried |  |  |  |
Land | 1,233 |  |  |
Buildings & Improvements | 59,747 |  |  |
Total | 60,980 |  |  |
Accumulated Depreciation | (26,549) |  |  |
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 | 21,551 |  |  |
Building & Improvements | 38,934 |  |  |
Cost Capitalized Subsequent to Acquisition |  |  |  |
Improvements | 895,989 |  |  |
Gross Amount at which Carried |  |  |  |
Land | 21,551 |  |  |
Buildings & Improvements | 934,923 |  |  |
Total | 956,474 |  |  |
Accumulated Depreciation | (211,068) |  |  |
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 | 7,240 |  |  |
Building & Improvements | 17,490 |  |  |
Cost Capitalized Subsequent to Acquisition |  |  |  |
Improvements | 241,218 |  |  |
Gross Amount at which Carried |  |  |  |
Land | 7,222 |  |  |
Buildings & Improvements | 258,726 |  |  |
Total | 265,948 |  |  |
Accumulated Depreciation | (109,502) |  |  |
First Stamford Place, Stamford, CT | office |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 178,616 |  |  |
Initial Cost to the Company |  |  |  |
Land | 22,952 |  |  |
Building & Improvements | 122,739 |  |  |
Cost Capitalized Subsequent to Acquisition |  |  |  |
Improvements | 63,292 |  |  |
Gross Amount at which Carried |  |  |  |
Land | 24,862 |  |  |
Buildings & Improvements | 184,121 |  |  |
Total | 208,983 |  |  |
Accumulated Depreciation | (78,570) |  |  |
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 | 91,592 |  |  |
Initial Cost to the Company |  |  |  |
Land | 5,313 |  |  |
Building & Improvements | 28,602 |  |  |
Cost Capitalized Subsequent to Acquisition |  |  |  |
Improvements | 15,301 |  |  |
Gross Amount at which Carried |  |  |  |
Land | 5,313 |  |  |
Buildings & Improvements | 43,903 |  |  |
Total | 49,216 |  |  |
Accumulated Depreciation | (30,763) |  |  |
383 Main Avenue, Norwalk, CT | office |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 29,614 |  |  |
Initial Cost to the Company |  |  |  |
Land | 2,262 |  |  |
Building & Improvements | 12,820 |  |  |
Cost Capitalized Subsequent to Acquisition |  |  |  |
Improvements | 22,253 |  |  |
Gross Amount at which Carried |  |  |  |
Land | 2,262 |  |  |
Buildings & Improvements | 35,073 |  |  |
Total | 37,335 |  |  |
Accumulated Depreciation | (12,876) |  |  |
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 | 4,571 |  |  |
Building & Improvements | 25,915 |  |  |
Cost Capitalized Subsequent to Acquisition |  |  |  |
Improvements | 22,198 |  |  |
Gross Amount at which Carried |  |  |  |
Land | 4,571 |  |  |
Buildings & Improvements | 48,113 |  |  |
Total | 52,684 |  |  |
Accumulated Depreciation | (23,147) |  |  |
10 Bank Street, White Plains, NY | office |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 33,316 |  |  |
Initial Cost to the Company |  |  |  |
Land | 5,612 |  |  |
Building & Improvements | 31,803 |  |  |
Cost Capitalized Subsequent to Acquisition |  |  |  |
Improvements | 18,412 |  |  |
Gross Amount at which Carried |  |  |  |
Land | 5,612 |  |  |
Buildings & Improvements | 50,215 |  |  |
Total | 55,827 |  |  |
Accumulated Depreciation | (21,134) |  |  |
10 Union Square, New York, NY | retail |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 49,116 |  |  |
Initial Cost to the Company |  |  |  |
Land | 5,003 |  |  |
Building & Improvements | 12,866 |  |  |
Cost Capitalized Subsequent to Acquisition |  |  |  |
Improvements | 1,966 |  |  |
Gross Amount at which Carried |  |  |  |
Land | 5,003 |  |  |
Buildings & Improvements | 14,832 |  |  |
Total | 19,835 |  |  |
Accumulated Depreciation | (7,801) |  |  |
1542 Third Avenue, New York, NY | retail |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 29,459 |  |  |
Initial Cost to the Company |  |  |  |
Land | 2,239 |  |  |
Building & Improvements | 15,266 |  |  |
Cost Capitalized Subsequent to Acquisition |  |  |  |
Improvements | 425 |  |  |
Gross Amount at which Carried |  |  |  |
Land | 2,239 |  |  |
Buildings & Improvements | 15,691 |  |  |
Total | 17,930 |  |  |
Accumulated Depreciation | (7,774) |  |  |
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 | 38,370 |  |  |
Initial Cost to the Company |  |  |  |
Land | 4,462 |  |  |
Building & Improvements | 15,817 |  |  |
Cost Capitalized Subsequent to Acquisition |  |  |  |
Improvements | 783 |  |  |
Gross Amount at which Carried |  |  |  |
Land | 4,462 |  |  |
Buildings & Improvements | 16,600 |  |  |
Total | 21,062 |  |  |
Accumulated Depreciation | (8,590) |  |  |
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 | 2,782 |  |  |
Building & Improvements | 15,766 |  |  |
Cost Capitalized Subsequent to Acquisition |  |  |  |
Improvements | 1,046 |  |  |
Gross Amount at which Carried |  |  |  |
Land | 2,782 |  |  |
Buildings & Improvements | 16,812 |  |  |
Total | 19,594 |  |  |
Accumulated Depreciation | (7,113) |  |  |
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 | 1,243 |  |  |
Building & Improvements | 7,043 |  |  |
Cost Capitalized Subsequent to Acquisition |  |  |  |
Improvements | 321 |  |  |
Gross Amount at which Carried |  |  |  |
Land | 1,260 |  |  |
Buildings & Improvements | 7,347 |  |  |
Total | 8,607 |  |  |
Accumulated Depreciation | (2,322) |  |  |
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 | 4,542 |  |  |
Building & Improvements | 0 |  |  |
Cost Capitalized Subsequent to Acquisition |  |  |  |
Improvements | 7,987 |  |  |
Gross Amount at which Carried |  |  |  |
Land | 12,529 |  |  |
Buildings & Improvements | 0 |  |  |
Total | 12,529 |  |  |
Accumulated Depreciation | $ 0 |  |  |

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