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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Mortgage Receivable and Notes Receivable (Details)
$ in Thousands
1 Months Ended 3 Months Ended 20 Months Ended
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Aug. 31, 2017
USD ($)
property
Mar. 31, 2020
USD ($)
community
Mar. 31, 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   12  
Multi-Family Residential              
MORTGAGE RECEIVABLE AND NOTES RECEIVABLE              
Loans receivable $ 16,600     $ 16,600      
Interest rate       6.00%      
Loan commitment             $ 16,200
Loan commitment, additional funds authorized 6,800 $ 6,200   $ 6,800   $ 6,200 $ 341
Multi-Family Residential | Discontinued Operations, Disposed of by Sale              
MORTGAGE RECEIVABLE AND NOTES RECEIVABLE              
Number of real estate properties sold | property     13        
Interest rate       5.50%      
Interest income       $ 139 $ 151    
Multi-Family Residential | Mortgage receivable              
MORTGAGE RECEIVABLE AND NOTES RECEIVABLE              
Loans receivable $ 10,000 $ 10,000 $ 11,000 10,000   10,000  
Construction Loans | Multi-Family Residential              
MORTGAGE RECEIVABLE AND NOTES RECEIVABLE              
Interest rate   4.50%          
Construction Loans | Minneapolis, Minnesota | Multi-Family Residential              
MORTGAGE RECEIVABLE AND NOTES RECEIVABLE              
Loan commitment   $ 29,900       29,900  
Mezzanine Loan | Multi-Family Residential              
MORTGAGE RECEIVABLE AND NOTES RECEIVABLE              
Interest rate   11.50%          
Mezzanine Loan | Minneapolis, Minnesota | Multi-Family Residential              
MORTGAGE RECEIVABLE AND NOTES RECEIVABLE              
Loan commitment   $ 15,300       $ 15,300  
Tax Increment Financing | Ironwood | Multi-Family Residential              
MORTGAGE RECEIVABLE AND NOTES RECEIVABLE              
Interest rate 4.50%            
Loan commitment $ 6,600     $ 6,600