Annual report pursuant to Section 13 and 15(d)

Investments In Unconsolidated Joint Ventures (Summary Of Company's Equity In Earnings (Loss) Of Unconsolidated Joint Ventures) (Details)

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Investments In Unconsolidated Joint Ventures (Summary Of Company's Equity In Earnings (Loss) Of Unconsolidated Joint Ventures) (Details) - USD ($)
12 Months Ended
Feb. 28, 2019
Jan. 31, 2019
Jan. 30, 2019
Aug. 02, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Aug. 01, 2018
Schedule of Equity Method Investments [Line Items]                
Company's equity in earnings (loss) of unconsolidated joint ventures         $ (1,319,000) $ (127,000) $ (6,081,000)  
Amortization of basis difference         638,000 903,000 792,000  
Marbella Tower Urban Renewal Associates LLC [Member]                
Schedule of Equity Method Investments [Line Items]                
Percentage of additional interest acquired       50.00%        
Company's Effective Ownership %               24.27%
Hillsborough 206 [Member]                
Schedule of Equity Method Investments [Line Items]                
Company's equity in earnings (loss) of unconsolidated joint ventures           16,000 (25,000)  
Red Bank [Member]                
Schedule of Equity Method Investments [Line Items]                
Percentage of interest sold 50.00%              
Gain on sale $ 900,000              
12 Vreeland Road [Member]                
Schedule of Equity Method Investments [Line Items]                
Impairment of Real Estate         3,700,000      
Unconsolidated Joint Venture Multi-Family Properties [Member] | Marbella I [Member]                
Schedule of Equity Method Investments [Line Items]                
Company's equity in earnings (loss) of unconsolidated joint ventures           205,000 334,000  
Unconsolidated Joint Venture Multi-Family Properties [Member] | Metropolitan At 40 Park [Member]                
Schedule of Equity Method Investments [Line Items]                
Company's equity in earnings (loss) of unconsolidated joint ventures         $ (422,000) (455,000) (311,000)  
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         $ 317,000 154,000 196,000  
Company's Effective Ownership %         22.50%      
Unconsolidated Joint Venture Multi-Family Properties [Member] | Marbella Tower Urban Renewal Associates LLC [Member]                
Schedule of Equity Method Investments [Line Items]                
Percentage of additional interest acquired   50.00% 50.00% 50.00%        
Company's Effective Ownership %   74.27% 24.27% 74.27%       24.27%
Unconsolidated Joint Venture Multi-Family Properties [Member] | Crystal House [Member]                
Schedule of Equity Method Investments [Line Items]                
Company's equity in earnings (loss) of unconsolidated joint ventures         $ (687,000) (874,000) (923,000)  
Company's Effective Ownership %         25.00%      
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         $ (279,000) (126,000) (872,000)  
Company's Effective Ownership %         40.00%      
Unconsolidated Joint Venture Multi-Family Properties [Member] | Marbella II [Member]                
Schedule of Equity Method Investments [Line Items]                
Company's equity in earnings (loss) of unconsolidated joint ventures         $ (15,000) 35,000 93,000  
Percentage of additional interest acquired   50.00%            
Company's Effective Ownership %   74.27% 24.27%   24.27%      
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         $ (172,000) (232,000) (252,000)  
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         $ (2,000,000) (2,096,000) (1,793,000)  
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         $ 1,587,000 (975,000) (6,356,000)  
Economic tax credit certificate income         2,600,000      
Annual proceeds from economic tax credit         3,000,000      
Total proceeds from economic tax credit         $ 24,000,000      
Company's Effective Ownership %         85.00%      
Unconsolidated Joint Venture Multi-Family Properties [Member] | Liberty Landing [Member]                
Schedule of Equity Method Investments [Line Items]                
Company's equity in earnings (loss) of unconsolidated joint ventures           (5,000) (15,000)  
Company's Effective Ownership %         50.00%      
Unconsolidated Joint Venture Multi-Family Properties [Member] | Hillsborough 206 [Member]                
Schedule of Equity Method Investments [Line Items]                
Company's Effective Ownership %         50.00%      
Unconsolidated Joint Venture Office Buildings [Member] | Red Bank [Member]                
Schedule of Equity Method Investments [Line Items]                
Company's equity in earnings (loss) of unconsolidated joint ventures         $ 8,000 (215,000) 238,000  
Company's Effective Ownership %         50.00%      
Gain on sale $ 900,000              
Unconsolidated Joint Venture Office Buildings [Member] | 12 Vreeland Road [Member]                
Schedule of Equity Method Investments [Line Items]                
Company's equity in earnings (loss) of unconsolidated joint ventures         $ (3,172,000) 285,000 496,000  
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         $ 79,000 73,000 89,000  
Company's Effective Ownership %         31.25%      
Unconsolidated Joint Venture Other Property [Member]                
Schedule of Equity Method Investments [Line Items]                
Company's equity in earnings (loss) of unconsolidated joint ventures         $ (1,319,000) (127,000) (6,081,000)  
Unconsolidated Joint Venture Other Property [Member] | Marbella Tower Urban Renewal Associates LLC [Member]                
Schedule of Equity Method Investments [Line Items]                
Percentage of additional interest acquired   50.00%            
Company's Effective Ownership %     24.27%          
Unconsolidated Joint Venture Other Property [Member] | Riverwalk Retail [Member]                
Schedule of Equity Method Investments [Line Items]                
Company's Effective Ownership %         20.00%      
Unconsolidated Joint Venture Other Property [Member] | Hyatt Regency Jersey City [Member]                
Schedule of Equity Method Investments [Line Items]                
Company's Effective Ownership %         50.00%      
Unconsolidated Joint Venture Other Property [Member] | Roseland/North Retail, L.L.C./ Riverwalk At Port Imperial [Member]                
Schedule of Equity Method Investments [Line Items]                
Company's equity in earnings (loss) of unconsolidated joint ventures         $ (72,000) (86,000) (81,000)  
Unconsolidated Joint Venture Other Property [Member] | South Pier At Harborside / Hyatt Regency Jersey City On The Hudson [Member]                
Schedule of Equity Method Investments [Line Items]                
Company's equity in earnings (loss) of unconsolidated joint ventures         3,388,000 3,672,000 3,277,000  
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         $ 121,000 $ 497,000 $ (176,000)