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DEBT OBLIGATIONS - Mortgages Payable (Details)
12 Months Ended
Dec. 31, 2018
USD ($)
item
Dec. 31, 2017
USD ($)
Mortgages Payable    
Mortgages payable, net $ 418,798,000 $ 393,157,000
Aggregate gross carrying value of real estate investments 829,143,000 775,327,000
Accumulated depreciation 123,684,000 108,953,000
Mortgages payable    
Mortgages Payable    
Mortgages payable, gross 423,096,000 396,946,000
Unamortized deferred financing costs (4,298,000) (3,789,000)
Mortgages payable, net $ 418,798,000 $ 393,157,000
Number of outstanding mortgages | item 70  
Aggregate gross carrying value of real estate investments $ 656,342,000  
Accumulated depreciation $ 97,012,000  
Weighted average interest rate (as a percent) 4.26% 4.22%
Mortgages payable | Interest rate swap | Minimum    
Mortgages Payable    
Annual fixed interest rate (as a percent) 3.02%  
Mortgages payable | Interest rate swap | Maximum    
Mortgages Payable    
Annual fixed interest rate (as a percent) 5.88%