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Schedule III - Real Estate and Accumulated Depreciation Schedule of Real Estate and Accumulated Depreciation (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
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SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | $ 717,164 |  |  |
Initial Cost to the Company |  |  |  |
Land | 199,287 |  |  |
Building & Improvements | 918,018 |  |  |
Cost Capitalized Subsequent to Acquisition |  |  |  |
Improvements | 1,550,350 |  |  |
Gross Amount at which Carried |  |  |  |
Land | 209,182 |  |  |
Buildings & Improvements | 2,458,473 |  |  |
Total | 2,667,655 | $ 2,458,629 | $ 2,276,330 | $ 2,139,863
Accumulated Depreciation | (656,900) | $ (556,546) | $ (465,584) | $ (377,552)
111 West 33rd Street, New York, NY [Member] | Office/Retail [Member] |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 84,085 |  |  |
Initial Cost to the Company |  |  |  |
Land | 13,630 |  |  |
Building & Improvements | 244,461 |  |  |
Cost Capitalized Subsequent to Acquisition |  |  |  |
Improvements | 76,316 |  |  |
Gross Amount at which Carried |  |  |  |
Land | 13,630 |  |  |
Buildings & Improvements | 320,777 |  |  |
Total | 334,407 |  |  |
Accumulated Depreciation | (31,591) |  |  |
1400 Broadway [Member] | Office/Retail [Member] |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 76,085 |  |  |
Initial Cost to the Company |  |  |  |
Land | 0 |  |  |
Building & Improvements | 96,338 |  |  |
Cost Capitalized Subsequent to Acquisition |  |  |  |
Improvements | 28,738 |  |  |
Gross Amount at which Carried |  |  |  |
Land | 0 |  |  |
Buildings & Improvements | 125,076 |  |  |
Total | 125,076 |  |  |
Accumulated Depreciation | (27,287) |  |  |
1333 Broadway, New York, NY [Member] | Office/Retail [Member] |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 66,590 |  |  |
Initial Cost to the Company |  |  |  |
Land | 91,435 |  |  |
Building & Improvements | 120,190 |  |  |
Cost Capitalized Subsequent to Acquisition |  |  |  |
Improvements | 6,143 |  |  |
Gross Amount at which Carried |  |  |  |
Land | 91,435 |  |  |
Buildings & Improvements | 126,333 |  |  |
Total | 217,768 |  |  |
Accumulated Depreciation | (18,481) |  |  |
1350 Broadway, New York, NY [Member] | Office/Retail [Member] |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 37,410 |  |  |
Initial Cost to the Company |  |  |  |
Land | 0 |  |  |
Building & Improvements | 102,518 |  |  |
Cost Capitalized Subsequent to Acquisition |  |  |  |
Improvements | 21,601 |  |  |
Gross Amount at which Carried |  |  |  |
Land | 0 |  |  |
Buildings & Improvements | 124,119 |  |  |
Total | 124,119 |  |  |
Accumulated Depreciation | (19,330) |  |  |
250 West 57th Street, New York, NY [Member] | Office/Retail [Member] |  |  |  |
SEC Schedule III, 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 | 113,414 |  |  |
Gross Amount at which Carried |  |  |  |
Land | 2,117 |  |  |
Buildings & Improvements | 118,455 |  |  |
Total | 120,572 |  |  |
Accumulated Depreciation | (32,729) |  |  |
501 Seventh Avenue, New York, NY [Member] | Office/Retail [Member] |  |  |  |
SEC Schedule III, 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 | 92,032 |  |  |
Gross Amount at which Carried |  |  |  |
Land | 1,100 |  |  |
Buildings & Improvements | 94,632 |  |  |
Total | 95,732 |  |  |
Accumulated Depreciation | (39,550) |  |  |
1359 Broadway, New York, NY [Member] | Office/Retail [Member] |  |  |  |
SEC Schedule III, 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 | 55,853 |  |  |
Gross Amount at which Carried |  |  |  |
Land | 1,233 |  |  |
Buildings & Improvements | 57,662 |  |  |
Total | 58,895 |  |  |
Accumulated Depreciation | (24,867) |  |  |
350 Fifth Avenue (Empire State Building), New York, NY [Member] | Office/Retail [Member] |  |  |  |
SEC Schedule III, 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 | 803,025 |  |  |
Gross Amount at which Carried |  |  |  |
Land | 21,551 |  |  |
Buildings & Improvements | 841,959 |  |  |
Total | 863,510 |  |  |
Accumulated Depreciation | (174,484) |  |  |
One Grand Central Place, New York, NY [Member] | Office/Retail [Member] |  |  |  |
SEC Schedule III, 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 | 216,947 |  |  |
Gross Amount at which Carried |  |  |  |
Land | 7,222 |  |  |
Buildings & Improvements | 234,455 |  |  |
Total | 241,677 |  |  |
Accumulated Depreciation | (98,280) |  |  |
First Stamford Place, Stamford, CT [Member] | Office Building [Member] |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 178,378 |  |  |
Initial Cost to the Company |  |  |  |
Land | 22,952 |  |  |
Building & Improvements | 122,739 |  |  |
Cost Capitalized Subsequent to Acquisition |  |  |  |
Improvements | 53,718 |  |  |
Gross Amount at which Carried |  |  |  |
Land | 24,862 |  |  |
Buildings & Improvements | 174,547 |  |  |
Total | 199,409 |  |  |
Accumulated Depreciation | (76,114) |  |  |
One Station Place, Stamford, CT (Metro Center) [Member] | Office Building [Member] |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 93,606 |  |  |
Initial Cost to the Company |  |  |  |
Land | 5,313 |  |  |
Building & Improvements | 28,602 |  |  |
Cost Capitalized Subsequent to Acquisition |  |  |  |
Improvements | 13,489 |  |  |
Gross Amount at which Carried |  |  |  |
Land | 5,313 |  |  |
Buildings & Improvements | 42,091 |  |  |
Total | 47,404 |  |  |
Accumulated Depreciation | (29,225) |  |  |
383 Main Avenue, Norwalk, CT [Member] | Office Building [Member] |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 29,572 |  |  |
Initial Cost to the Company |  |  |  |
Land | 2,262 |  |  |
Building & Improvements | 12,820 |  |  |
Cost Capitalized Subsequent to Acquisition |  |  |  |
Improvements | 17,534 |  |  |
Gross Amount at which Carried |  |  |  |
Land | 2,262 |  |  |
Buildings & Improvements | 30,354 |  |  |
Total | 32,616 |  |  |
Accumulated Depreciation | (11,933) |  |  |
500 Mamaroneck Avenue, Harrison, NY [Member] | Office Building [Member] |  |  |  |
SEC Schedule III, 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 | 22,393 |  |  |
Gross Amount at which Carried |  |  |  |
Land | 4,571 |  |  |
Buildings & Improvements | 48,308 |  |  |
Total | 52,879 |  |  |
Accumulated Depreciation | (21,928) |  |  |
10 Bank Street, White Plains, NY [Member] | Office Building [Member] |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 34,092 |  |  |
Initial Cost to the Company |  |  |  |
Land | 5,612 |  |  |
Building & Improvements | 31,803 |  |  |
Cost Capitalized Subsequent to Acquisition |  |  |  |
Improvements | 17,042 |  |  |
Gross Amount at which Carried |  |  |  |
Land | 5,612 |  |  |
Buildings & Improvements | 48,845 |  |  |
Total | 54,457 |  |  |
Accumulated Depreciation | (19,441) |  |  |
10 Union Square, New York, NY [Member] | Retail [Member] |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 48,966 |  |  |
Initial Cost to the Company |  |  |  |
Land | 5,003 |  |  |
Building & Improvements | 12,866 |  |  |
Cost Capitalized Subsequent to Acquisition |  |  |  |
Improvements | 1,787 |  |  |
Gross Amount at which Carried |  |  |  |
Land | 5,003 |  |  |
Buildings & Improvements | 14,653 |  |  |
Total | 19,656 |  |  |
Accumulated Depreciation | (7,359) |  |  |
1542 Third Avenue, New York, NY [Member] | Retail [Member] |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 29,384 |  |  |
Initial Cost to the Company |  |  |  |
Land | 2,239 |  |  |
Building & Improvements | 15,266 |  |  |
Cost Capitalized Subsequent to Acquisition |  |  |  |
Improvements | 424 |  |  |
Gross Amount at which Carried |  |  |  |
Land | 2,239 |  |  |
Buildings & Improvements | 15,690 |  |  |
Total | 17,929 |  |  |
Accumulated Depreciation | (7,347) |  |  |
1010 Third Avenue, New York, NY and 77 West 55th Street, New York, NY [Member] | Retail [Member] |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 38,996 |  |  |
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 | (8,166) |  |  |
69-97 Main Street, Westport, CT [Member] | Retail [Member] |  |  |  |
SEC Schedule III, 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 | 943 |  |  |
Gross Amount at which Carried |  |  |  |
Land | 2,782 |  |  |
Buildings & Improvements | 16,709 |  |  |
Total | 19,491 |  |  |
Accumulated Depreciation | (6,679) |  |  |
103-107 Main Street, Westport, CT [Member] | Retail [Member] |  |  |  |
SEC Schedule III, 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 | 182 |  |  |
Gross Amount at which Carried |  |  |  |
Land | 1,260 |  |  |
Buildings & Improvements | 7,208 |  |  |
Total | 8,468 |  |  |
Accumulated Depreciation | (2,109) |  |  |
Transportation Hub, Stamford, CT [Member] | Land [Member] |  |  |  |
SEC Schedule III, 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 | 7,986 |  |  |
Gross Amount at which Carried |  |  |  |
Land | 12,528 |  |  |
Buildings & Improvements | 0 |  |  |
Total | 12,528 |  |  |
Accumulated Depreciation | $ 0 |  |  |

X
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