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Schedule III - Real Estate and Accumulated Depreciation Schedule of Real Estate and Accumulated Depreciation (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
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SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | $ 759,016 |  |  |
Initial Cost to the Company |  |  |  |
Land | 199,287 |  |  |
Building & Improvements | 918,018 |  |  |
Cost Capitalized Subsequent to Acquisition |  |  |  |
Improvements | 1,341,324 |  |  |
Gross Amount at which Carried |  |  |  |
Land | 209,147 |  |  |
Buildings & Improvements | 2,249,482 |  |  |
Total | 2,458,629 | $ 2,276,330 | $ 2,139,863 | $ 1,649,423
Accumulated Depreciation | (556,546) | $ (465,584) | $ (377,552) | $ (295,351)
111 West 33rd Street, New York, NY [Member] | Office/Retail [Member] |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 87,656 |  |  |
Initial Cost to the Company |  |  |  |
Land | 13,630 |  |  |
Building & Improvements | 244,461 |  |  |
Cost Capitalized Subsequent to Acquisition |  |  |  |
Improvements | 46,954 |  |  |
Gross Amount at which Carried |  |  |  |
Land | 13,630 |  |  |
Buildings & Improvements | 291,415 |  |  |
Total | 305,045 |  |  |
Accumulated Depreciation | (20,781) |  |  |
1400 Broadway [Member] | Office/Retail [Member] |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 79,237 |  |  |
Initial Cost to the Company |  |  |  |
Land | 0 |  |  |
Building & Improvements | 96,338 |  |  |
Cost Capitalized Subsequent to Acquisition |  |  |  |
Improvements | 19,908 |  |  |
Gross Amount at which Carried |  |  |  |
Land | 0 |  |  |
Buildings & Improvements | 116,246 |  |  |
Total | 116,246 |  |  |
Accumulated Depreciation | (19,003) |  |  |
1333 Broadway, New York, NY [Member] | Office/Retail [Member] |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 69,520 |  |  |
Initial Cost to the Company |  |  |  |
Land | 91,435 |  |  |
Building & Improvements | 120,190 |  |  |
Cost Capitalized Subsequent to Acquisition |  |  |  |
Improvements | 4,965 |  |  |
Gross Amount at which Carried |  |  |  |
Land | 91,435 |  |  |
Buildings & Improvements | 125,155 |  |  |
Total | 216,590 |  |  |
Accumulated Depreciation | (14,064) |  |  |
1350 Broadway, New York, NY [Member] | Office/Retail [Member] |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 38,842 |  |  |
Initial Cost to the Company |  |  |  |
Land | 0 |  |  |
Building & Improvements | 102,518 |  |  |
Cost Capitalized Subsequent to Acquisition |  |  |  |
Improvements | 18,986 |  |  |
Gross Amount at which Carried |  |  |  |
Land | 0 |  |  |
Buildings & Improvements | 121,504 |  |  |
Total | 121,504 |  |  |
Accumulated Depreciation | (14,154) |  |  |
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 | 95,233 |  |  |
Gross Amount at which Carried |  |  |  |
Land | 2,117 |  |  |
Buildings & Improvements | 100,274 |  |  |
Total | 102,391 |  |  |
Accumulated Depreciation | (27,130) |  |  |
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 | 89,650 |  |  |
Gross Amount at which Carried |  |  |  |
Land | 1,100 |  |  |
Buildings & Improvements | 92,250 |  |  |
Total | 93,350 |  |  |
Accumulated Depreciation | (36,636) |  |  |
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 | 52,461 |  |  |
Gross Amount at which Carried |  |  |  |
Land | 1,233 |  |  |
Buildings & Improvements | 54,270 |  |  |
Total | 55,503 |  |  |
Accumulated Depreciation | (21,296) |  |  |
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 | 691,784 |  |  |
Gross Amount at which Carried |  |  |  |
Land | 21,551 |  |  |
Buildings & Improvements | 730,718 |  |  |
Total | 752,269 |  |  |
Accumulated Depreciation | (137,791) |  |  |
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 | 201,322 |  |  |
Gross Amount at which Carried |  |  |  |
Land | 7,222 |  |  |
Buildings & Improvements | 218,830 |  |  |
Total | 226,052 |  |  |
Accumulated Depreciation | (87,075) |  |  |
First Stamford Place, Stamford, CT [Member] | Office Building [Member] |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 234,953 |  |  |
Initial Cost to the Company |  |  |  |
Land | 22,952 |  |  |
Building & Improvements | 122,739 |  |  |
Cost Capitalized Subsequent to Acquisition |  |  |  |
Improvements | 46,409 |  |  |
Gross Amount at which Carried |  |  |  |
Land | 24,862 |  |  |
Buildings & Improvements | 167,238 |  |  |
Total | 192,100 |  |  |
Accumulated Depreciation | (70,988) |  |  |
One Station Place, Stamford, CT (Metro Center) [Member] | Office Building [Member] |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 95,574 |  |  |
Initial Cost to the Company |  |  |  |
Land | 5,313 |  |  |
Building & Improvements | 28,602 |  |  |
Cost Capitalized Subsequent to Acquisition |  |  |  |
Improvements | 13,069 |  |  |
Gross Amount at which Carried |  |  |  |
Land | 5,313 |  |  |
Buildings & Improvements | 41,671 |  |  |
Total | 46,984 |  |  |
Accumulated Depreciation | (27,860) |  |  |
383 Main Avenue, Norwalk, CT [Member] | Office Building [Member] |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 28,639 |  |  |
Initial Cost to the Company |  |  |  |
Land | 2,262 |  |  |
Building & Improvements | 12,820 |  |  |
Cost Capitalized Subsequent to Acquisition |  |  |  |
Improvements | 15,281 |  |  |
Gross Amount at which Carried |  |  |  |
Land | 2,262 |  |  |
Buildings & Improvements | 28,101 |  |  |
Total | 30,363 |  |  |
Accumulated Depreciation | (10,776) |  |  |
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 | 18,784 |  |  |
Gross Amount at which Carried |  |  |  |
Land | 4,571 |  |  |
Buildings & Improvements | 44,699 |  |  |
Total | 49,270 |  |  |
Accumulated Depreciation | (20,129) |  |  |
10 Bank Street, White Plains, NY [Member] | Office Building [Member] |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 31,531 |  |  |
Initial Cost to the Company |  |  |  |
Land | 5,612 |  |  |
Building & Improvements | 31,803 |  |  |
Cost Capitalized Subsequent to Acquisition |  |  |  |
Improvements | 14,665 |  |  |
Gross Amount at which Carried |  |  |  |
Land | 5,612 |  |  |
Buildings & Improvements | 46,468 |  |  |
Total | 52,080 |  |  |
Accumulated Depreciation | (19,174) |  |  |
10 Union Square, New York, NY [Member] | Retail [Member] |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 48,824 |  |  |
Initial Cost to the Company |  |  |  |
Land | 5,003 |  |  |
Building & Improvements | 12,866 |  |  |
Cost Capitalized Subsequent to Acquisition |  |  |  |
Improvements | 1,661 |  |  |
Gross Amount at which Carried |  |  |  |
Land | 5,003 |  |  |
Buildings & Improvements | 14,527 |  |  |
Total | 19,530 |  |  |
Accumulated Depreciation | (6,954) |  |  |
1542 Third Avenue, New York, NY [Member] | Retail [Member] |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 17,784 |  |  |
Initial Cost to the Company |  |  |  |
Land | 2,239 |  |  |
Building & Improvements | 15,266 |  |  |
Cost Capitalized Subsequent to Acquisition |  |  |  |
Improvements | 391 |  |  |
Gross Amount at which Carried |  |  |  |
Land | 2,239 |  |  |
Buildings & Improvements | 15,657 |  |  |
Total | 17,896 |  |  |
Accumulated Depreciation | (6,925) |  |  |
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 | 26,456 |  |  |
Initial Cost to the Company |  |  |  |
Land | 4,462 |  |  |
Building & Improvements | 15,817 |  |  |
Cost Capitalized Subsequent to Acquisition |  |  |  |
Improvements | 774 |  |  |
Gross Amount at which Carried |  |  |  |
Land | 4,462 |  |  |
Buildings & Improvements | 16,591 |  |  |
Total | 21,053 |  |  |
Accumulated Depreciation | (7,740) |  |  |
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 | 918 |  |  |
Gross Amount at which Carried |  |  |  |
Land | 2,782 |  |  |
Buildings & Improvements | 16,684 |  |  |
Total | 19,466 |  |  |
Accumulated Depreciation | (6,165) |  |  |
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 | 158 |  |  |
Gross Amount at which Carried |  |  |  |
Land | 1,260 |  |  |
Buildings & Improvements | 7,184 |  |  |
Total | 8,444 |  |  |
Accumulated Depreciation | (1,905) |  |  |
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 | 7,951 |  |  |
Gross Amount at which Carried |  |  |  |
Land | 12,493 |  |  |
Buildings & Improvements | 0 |  |  |
Total | 12,493 |  |  |
Accumulated Depreciation | $ 0 |  |  |

X
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