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Receivables (Details) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Receivables [Abstract]    
Rents and other receivables, net $ 5,061,000 $ 4,443,000
Mortgage note receivable 3,500,000 3,500,000
Straight-line rents, net 13,603,000 14,034,000
Receivables $ 22,164,000 $ 21,977,000