BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Change in Depreciable Lives of Real Estate Assets and Real Estate Held For Sale (Details) - apartmentProperty	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022
Real Estate Properties [Line Items]
Number of year after date of acquisition related to adjustment of real estate preliminary allocations of purchase price	1 year
Assets Held for Sale
Real Estate Properties [Line Items]
Number of real estate properties classified as held for sale	0	0

The number of year after the date of acquisition related to adjustment of real estate preliminary allocations of the purchase price.

No definition available.

Name:	csr_NumberOfYearAfterDateOfAcquisitionRelatedToAdjustmentOfRealEstatePreliminaryAllocationsOfPurchasePrice
Namespace Prefix:	csr_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration