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MORTGAGE NOTES PAYABLE (Mortgage by property) (Details)
May 31, 2019
USD ($)
Mar. 29, 2018
USD ($)
item
Mar. 12, 2018
USD ($)
Sep. 30, 2019
USD ($)
property
Sep. 30, 2018
property
Aug. 31, 2014
Dec. 31, 2005
Mar. 07, 2005
item
MORTGAGE NOTES PAYABLE                
Number of units | property         913      
Loan balance       $ 252,798,000        
Residences at Captain Parkers LLC Residential Apartments Lexington, Massachusetts                
MORTGAGE NOTES PAYABLE                
Loan amount $ 20,750,000              
Interest rate (as a percent) 4.05%              
Loan balance $ 20,071,000              
Mortgage prepayment penalties $ 202,000              
Hamilton Essex 81                
MORTGAGE NOTES PAYABLE                
Number of units       49 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          
Debt Instrument, Amortization Term     30 years          
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  
Debt Instrument, Amortization Term             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%