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Identified Intangible Liabilities, Net Identified Intangible Liabilities, Net (Phantom) (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Amortization of Identified Intangible Liabilities $ 102,000 $ 85,000  
Finite Lived Intangible Liabilities Useful Life 5 years 8 months 12 days   16 years 4 months 24 days
Below Market Lease [Member]      
Amortization of above and below Market Leases $ 102,000 83,000  
Finite Lived Intangible Liabilities Accumulated Amortization $ 780,000   $ 678,000
Finite Lived Intangible Liabilities Useful Life 5 years 8 months 12 days   5 years 8 months 12 days
Above-market leasehold interest [Member]      
Finite Lived Intangible Liabilities Accumulated Amortization $ 0   $ 13,000
Finite Lived Intangible Liabilities Useful Life 8 days   51 years 2 months 12 days
Amortization of above market leasehold interest $ 0 $ 2,000