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Debt - Mortgage Debt (Details) $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 22, 2021 USD ($) multifamily_asset | Dec. 31, 2021 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Debt Instrument [Line Items] |  |  |  |  |
Impairment charges |  |  | $ 7,723 | $ 6,204 | $ 0
Victory 561 10th Avenue and 345 East 94th Street |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Number of acquisitions | multifamily_asset | 2 |  |  |  |
Mortgages | 383 Main Avenue |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Fixed rate debt |  | $ 30,000 | $ 30,000 | $ 30,000 |
Impairment charges |  | $ 7,700 |  |  |
Effective rate (as a percent) |  | 4.56% | 4.56% |  |
Mortgages | The Victory |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt assumed | $ 134,000 |  |  |  |
Effective rate (as a percent) | 3.85% |  |  |  |
Mortgages | 345 East 94th St. |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt assumed | $ 52,000 |  |  |  |
Effective rate (as a percent) | 3.56% |  |  |  |

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