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Investments in and Advances to Unconsolidated Real Estate Ventures - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]          
Income (Loss) from Equity Method Investments $ (1,144,000) $ 13,484,000 $ 647,000 $ 15,418,000  
1101 17th Street [Member]          
Schedule of Equity Method Investments [Line Items]          
Real Estate Investments, Unconsolidated Real Estate and Other Joint Ventures, Excluding Advances $ 0   0   $ 0
Income (Loss) from Equity Method Investments   $ 890,000 $ 6,400,000 890,000  
Investments in Unconsolidated Real Estate Ventures [Member] | 1101 17th Street [Member]          
Schedule of Equity Method Investments [Line Items]          
Income (Loss) from Equity Method Investments       $ 5,400,000