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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Mortgage Receivable and Notes Receivable (Details)
$ in Thousands
1 Months Ended 9 Months Ended 20 Months Ended
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Aug. 31, 2017
USD ($)
property
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
community
Jul. 31, 2017
USD ($)
MORTGAGE RECEIVABLE AND NOTES RECEIVABLE              
Loans receivable, communities remaining in the pool of assets used to secure the mortgage | community           12  
Multi-Family Residential | Ironwood              
MORTGAGE RECEIVABLE AND NOTES RECEIVABLE              
Loans receivable   $ 16,600       $ 16,600  
Loan commitment             $ 16,200
Loan commitment, additional funds authorized             $ 341
Multi-Family Residential | Ironwood | Tax Increment Financing              
MORTGAGE RECEIVABLE AND NOTES RECEIVABLE              
Loan commitment $ 6,600            
Interest rate 4.50%            
Multi-Family Residential | Minneapolis, Minnesota              
MORTGAGE RECEIVABLE AND NOTES RECEIVABLE              
Loans receivable   6,200   $ 18,000   6,200  
Multi-Family Residential | Minneapolis, Minnesota | Construction Loans              
MORTGAGE RECEIVABLE AND NOTES RECEIVABLE              
Loan commitment   $ 29,900       29,900  
Interest rate   4.50%          
Multi-Family Residential | Minneapolis, Minnesota | Mezzanine Loan              
MORTGAGE RECEIVABLE AND NOTES RECEIVABLE              
Loan commitment   $ 15,300       15,300  
Interest rate   11.50%          
Multi-Family Residential | Mortgage receivable              
MORTGAGE RECEIVABLE AND NOTES RECEIVABLE              
Loans receivable   $ 10,000 $ 11,000     $ 10,000  
Multi-Family Residential | Discontinued Operations, Disposed of by Sale              
MORTGAGE RECEIVABLE AND NOTES RECEIVABLE              
Number of real estate properties sold | property     13        
Interest income       $ 279 $ 428