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RENTAL PROPERTIES (Mill Street) (Details)
Dec. 20, 2019
USD ($)
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Dec. 31, 2019
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Dec. 31, 2018
USD ($)
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Dec. 31, 2017
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RENTAL PROPERTIES        
Number of units | item   913 913 913
Line of credit     $ 18,000,000  
Subsequent Advance        
RENTAL PROPERTIES        
Loan amount $ 4,000,000      
Mill Street Gardens Residential Apartments Woburn Massachusetts        
RENTAL PROPERTIES        
Number of units | item 181      
Purchase price of real estate properties $ 59,550,000      
Closing costs associated with financing 237,000      
Line of credit 18,000,000      
Cash from reserves 10,550,000      
Loan amount 31,000,000      
Purchase price allocated to the value of the in-place leases 1,282,000      
Purchase price allocated to the value of the tenant relationships $ 136,000      
Amortization period of value of the in-place leases 12 months      
Amortization period of value of the tenant relationships 36 months      
Mill Street Gardens Residential Apartments Woburn Massachusetts | Maximum        
RENTAL PROPERTIES        
Loan amount $ 35,000,000      
Mill Street Gardens Residential Apartments Woburn Massachusetts | Initial Advance        
RENTAL PROPERTIES        
Loan amount $ 31,000,000      
Interest rate (as a percent) 3.586%      
Mill Street Gardens Residential Apartments Woburn Massachusetts | Subsequent Advance        
RENTAL PROPERTIES        
Loan amount $ 4,000,000      
Interest rate (as a percent) 3.50%