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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Mortgage Receivable and Notes Receivable (Details)
1 Months Ended 3 Months Ended 9 Months Ended
Aug. 31, 2017
USD ($)
property
Sep. 30, 2019
USD ($)
community
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Jul. 31, 2017
USD ($)
MORTGAGE RECEIVABLE AND NOTES RECEIVABLE          
Mortgage loans receivable $ 11,000,000.0 $ 10,100,000 $ 10,100,000    
Loans receivable, communities remaining in the pool of assets used to secure the mortgage | community   12      
Multi-Family Residential          
MORTGAGE RECEIVABLE AND NOTES RECEIVABLE          
Interest rate   6.00%      
Loan commitment         $ 16,200,000
Loan commitment, additional funds authorized         $ 341,000
Loans receivable   $ 17,300,000 17,300,000    
Discontinued Operations, Disposed of by Sale | Multi-Family Residential          
MORTGAGE RECEIVABLE AND NOTES RECEIVABLE          
Number of real estate properties sold | property 13        
Interest rate   5.50%      
Interest income     $ 428,000 $ 455,000