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MORTGAGE NOTES PAYABLE (Mortgage by property) (Details)
Mar. 29, 2018
USD ($)
item
Mar. 12, 2018
USD ($)
Jul. 06, 2017
USD ($)
item
Sep. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2017
item
Sep. 29, 2017
USD ($)
Aug. 31, 2014
Dec. 31, 2005
Mar. 07, 2005
item
MORTGAGE NOTES PAYABLE                    
Number of units | item           1,033        
Line of credit       $ 5,000,000 $ 17,000,000          
Hamilton Essex 81                    
MORTGAGE NOTES PAYABLE                    
Number of units | item           49       48
Webster Green Apartments                    
MORTGAGE NOTES PAYABLE                    
Number of units | item 79                  
Loan amount $ 21,500,000                  
Purchase price of real estate properties 34,500,000                  
Cash payment 13,000,000                  
Cash from reserves 5,000,000                  
Line of credit 8,000,000                  
Closing Costs $ 141,000                  
659 Worcester Road                    
MORTGAGE NOTES PAYABLE                    
Loan amount   $ 6,083,683                
Closing Costs   $ 69,000                
Interest rate (as a percent)   4.87%                
Amortization period of debt   30 years                
Future monthly payment amount   $ 32,427                
Woodland Park Apartments LLC Newton Massachusetts                    
MORTGAGE NOTES PAYABLE                    
Number of units | item     126              
Loan amount     $ 16,000,000       $ 22,250,000      
Purchase price of real estate properties     45,600,000              
Line of credit     $ 25,000,000   $ 17,000,000          
Interest rate (as a percent)     4.75%       3.79%      
Mortgages payable | Hamilton on Main Apartments, LLC                    
MORTGAGE NOTES PAYABLE                    
Interest rate (as a percent)               4.34% 5.18%  
Amortization period of debt                 30 years  
Mortgages payable | Minimum                    
MORTGAGE NOTES PAYABLE                    
Interest rate (as a percent)       3.76%            
Mortgages payable | Maximum                    
MORTGAGE NOTES PAYABLE                    
Interest rate (as a percent)       5.81%