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DEBT OBLIGATIONS - Mortgages Payable (Details)
12 Months Ended
Dec. 31, 2020
USD ($)
item
Dec. 31, 2019
USD ($)
Mortgages Payable    
Mortgages payable, net $ 429,704,000 $ 435,840,000
Aggregate gross carrying value of real estate investments 839,058,000 835,837,000
Accumulated depreciation 147,136,000 135,302,000
Real Estate Investments with outstanding mortgages    
Mortgages Payable    
Aggregate gross carrying value of real estate investments 708,913,000  
Accumulated depreciation 116,579,000  
Mortgages payable    
Mortgages Payable    
Mortgages payable, gross 433,549,000 440,278,000
Unamortized deferred financing costs (3,845,000) (4,438,000)
Mortgages payable, net $ 429,704,000 $ 435,840,000
Number of outstanding mortgages | item 74  
Weighted average interest rate (as a percent) 4.19% 4.21%
Mortgages payable | Minimum    
Mortgages Payable    
Interest rate after giving effect to interest rate swap agreements 3.02%  
Mortgages payable | Maximum    
Mortgages Payable    
Interest rate after giving effect to interest rate swap agreements 5.87%  
Mortgages payable | COVID-19    
Mortgages Payable    
Amount of deferred debt service payments repaid $ 174,000  
Mortgages payable | COVID-19 | Debt service due in 2020 and 2021    
Mortgages Payable    
Deferral of debt service payments 1,670,000  
Mortgages payable | COVID-19 | Deferrals from 2021 through 2023    
Mortgages Payable    
Deferral of debt service payments $ 303,000