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Investments In Unconsolidated Joint Ventures (Summary Of Company's Equity In Earnings (Loss) Of Unconsolidated Joint Ventures) (Details) - USD ($) $ in Thousands		3 Months Ended
	Sep. 01, 2021	Mar. 31, 2022	Mar. 31, 2021
Schedule of Equity Method Investments [Line Items]
Company's equity in earnings (loss) of unconsolidated joint ventures		$ (487)	$ (1,456)
Amortization of basis difference		154	143
Unconsolidated Joint Venture Multi-Family Properties [Member] \| Metropolitan And Lofts At 40 Park [Member]
Schedule of Equity Method Investments [Line Items]
Company's equity in earnings (loss) of unconsolidated joint ventures		$ (139)	(231)
Company's Effective Ownership %		25.00%
Unconsolidated Joint Venture Multi-Family Properties [Member] \| RiverTrace At Port Imperial [Member]
Schedule of Equity Method Investments [Line Items]
Company's equity in earnings (loss) of unconsolidated joint ventures		$ 67	(5)
Company's Effective Ownership %		22.50%
Unconsolidated Joint Venture Multi-Family Properties [Member] \| PI North - Riverwalk C [Member]
Schedule of Equity Method Investments [Line Items]
Company's equity in earnings (loss) of unconsolidated joint ventures		$ 26
Unconsolidated Joint Venture Multi-Family Properties [Member] \| Riverpark At Harrison [Member]
Schedule of Equity Method Investments [Line Items]
Company's equity in earnings (loss) of unconsolidated joint ventures			(50)
Company's Effective Ownership %		45.00%
Unconsolidated Joint Venture Multi-Family Properties [Member] \| Station House [Member]
Schedule of Equity Method Investments [Line Items]
Company's equity in earnings (loss) of unconsolidated joint ventures		$ (358)	(364)
Company's Effective Ownership %		50.00%
Unconsolidated Joint Venture Multi-Family Properties [Member] \| Urby At Harborside [Member]
Schedule of Equity Method Investments [Line Items]
Company's equity in earnings (loss) of unconsolidated joint ventures		$ (26)	(745)
Company's Effective Ownership %		85.00%
Unconsolidated Joint Venture Multi-Family Properties [Member] \| PI North Pier Land [Member]
Schedule of Equity Method Investments [Line Items]
Company's equity in earnings (loss) of unconsolidated joint ventures		$ (70)	(57)
Unconsolidated Joint Venture Multi-Family Properties [Member] \| Liberty Landing [Member]
Schedule of Equity Method Investments [Line Items]
Company's Effective Ownership %		50.00%
Unconsolidated Joint Venture Office Buildings [Member] \| Offices At Crystal Lake [Member]
Schedule of Equity Method Investments [Line Items]
Company's equity in earnings (loss) of unconsolidated joint ventures			(118)
Sale price	$ 1,900
Unconsolidated Joint Venture Other Property [Member] \| Other [Member]
Schedule of Equity Method Investments [Line Items]
Company's equity in earnings (loss) of unconsolidated joint ventures		$ 13	$ 114