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MORTGAGE NOTES PAYABLE (Mortgage by property) (Details) - USD ($)
Sep. 29, 2017
Aug. 03, 2016
Dec. 31, 2017
Jul. 16, 2017
Jul. 06, 2017
Hamilton Green          
MORTGAGE NOTES PAYABLE          
Closing Costs   $ 227,663      
Woodland Park Apartments LLC Newton Massachusetts          
MORTGAGE NOTES PAYABLE          
Term of debt 30 years        
Mortgage amount $ 22,250,000     $ 16,000,000 $ 16,000,000
Interest rate (as a percent) 3.79%     4.75%  
Mortgages payable | Minimum          
MORTGAGE NOTES PAYABLE          
Interest rate (as a percent)     3.24%    
Mortgages payable | Maximum          
MORTGAGE NOTES PAYABLE          
Interest rate (as a percent)     5.97%