COMMITMENTS AND CONTINGENCIES (Details) - Subject to Restrictions on Taxable Dispositions	Sep. 30, 2021 apartmentProperty apartmentUnit
Real Estate Properties [Line Items]
Number of properties \| apartmentProperty	34
Number of apartment units \| apartmentUnit	6,511

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

Name:	us-gaap_RealEstatePropertiesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration