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Commitments and Contingencies - Major Customers and Other Concentrations (Details) - Customer concentration risk - Rental revenue - office_property | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Concentration Risk [Line Items] |  |  |
Number of properties | 6 | 6 | 6
Empire State Building |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk percentage (as a percent) | 29.90% | 31.70% | 32.80%
One Grand Central Place |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk percentage (as a percent) | 12.40% | 12.60% | 12.40%
111 West 33rd Street |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk percentage (as a percent) | 11.20% | 11.30% | 10.50%
1400 Broadway |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk percentage (as a percent) | 8.30% | 8.90% | 8.00%
250 West 57th Street |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk percentage (as a percent) | 6.00% | 5.80% | 5.70%
First Stamford Place |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk percentage (as a percent) | 4.70% | 5.20% | 5.40%
Tenant 1 |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk percentage (as a percent) | 6.40% | 4.60% | 6.90%
Tenant 2 |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk percentage (as a percent) | 2.00% | 3.30% |
Tenant 3 |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk percentage (as a percent) |  | 2.80% | 3.50%
Tenant 4 |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk percentage (as a percent) |  | 2.10% |

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