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COMMITMENTS AND CONTINGENCIES (Details)
$ in Millions
12 Months Ended
Dec. 31, 2020
USD ($)
property
numberOfApartmentHomes
apartment_community
Dec. 31, 2019
USD ($)
Real Estate Properties [Line Items]    
Number of real estate properties | apartment_community 67  
Redemption basis 1  
Number of consecutive trading days for valuation 10 days  
Aggregate redemption value of units of operating partnership owned by limited partners | $ $ 69.0 $ 76.6
Subject to Restrictions on Taxable Dispositions    
Real Estate Properties [Line Items]    
Number of real estate properties | property 20  
Number of apartment homes (approximately) | numberOfApartmentHomes 4,032