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Debt - Mortgage Debt (Details) $ in Thousands		3 Months Ended	12 Months Ended
Debt - Mortgage Debt (Details) $ in Thousands	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]
Mortgage 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%