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Rental Property - Held for Sale (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2021
USD ($)
building
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
building
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Long Lived Assets Held-for-sale [Line Items]          
Assets held for sale, net $ 2,737,000   $ 2,737,000   $ 444,000
Deferred leasing intangibles, net of accumulated amortization of $260,893 and $258,005, respectively $ 482,672,000   $ 482,672,000   $ 499,802,000
Number of properties | building 501   501    
Disposal Group, Held-for-sale, Not Discontinued Operations [Member]          
Long Lived Assets Held-for-sale [Line Items]          
Deferred leasing intangibles, net of accumulated amortization of $260,893 and $258,005, respectively $ 0   $ 0    
Number of properties | building 1   1    
Contribution to revenue $ 100,000 $ 200,000 $ 300,000 $ 300,000  
Disposal Group, Including Discontinued Operation, Operating Income (Loss) 100,000 $ 100,000 200,000 $ 100,000  
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Land [Member]          
Long Lived Assets Held-for-sale [Line Items]          
Assets held for sale, net 800,000   800,000    
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Building and Building Improvements [Member]          
Long Lived Assets Held-for-sale [Line Items]          
Assets held for sale, net $ 1,900,000   $ 1,900,000