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Receivables (Details) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Receivables [Abstract]    
Rents and other receivables, net $ 4,443,000 $ 3,118,000
Mortgage note receivable 3,500,000  
Straight-line rents, net 14,034,000 14,075,000
Receivables $ 21,977,000 $ 17,193,000