ACQUISITIONS AND DISPOSITIONS - Dispositions (Details) $ in Thousands	12 Months Ended
Dec. 31, 2022 apartmentProperty	Dec. 31, 2021 USD ($) apartmentUnit
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal, Statement of Income or Comprehensive Income [Extensible Enumeration]		Gain (loss) on sale of real estate and other investments
Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties sold \| apartmentProperty	0
Sales Price		$ 62,250
Book Value and Sales Cost		34,733
Gain/(Loss)		27,517
Multifamily \| Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sales Price		60,000
Book Value and Sales Cost		33,160
Gain/(Loss)		$ 26,840
Multifamily \| Crystal Bay - Rochester, MN \| Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties sold \| apartmentUnit		76
Sales Price		$ 13,650
Book Value and Sales Cost		10,255
Gain/(Loss)		$ 3,395
Multifamily \| French Creek - Rochester, MN \| Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties sold \| apartmentUnit		40
Sales Price		$ 6,700
Book Value and Sales Cost		4,474
Gain/(Loss)		$ 2,226
Multifamily \| Heritage Manor- Rochester, MN \| Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties sold \| apartmentUnit		182
Sales Price		$ 14,125
Book Value and Sales Cost		4,892
Gain/(Loss)		$ 9,233
Multifamily \| Olympik Village - Rochester, MN \| Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties sold \| apartmentUnit		140
Sales Price		$ 10,725
Book Value and Sales Cost		6,529
Gain/(Loss)		$ 4,196
Multifamily \| Winchester/Village Green-Rochester, MN \| Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties sold \| apartmentUnit		151
Sales Price		$ 14,800
Book Value and Sales Cost		7,010
Gain/(Loss)		7,790
Other \| Minot IPS \| Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sales Price		2,250
Book Value and Sales Cost		1,573
Gain/(Loss)		$ 677

Disposal Group, Including Discontinued Operation, Asset Net Book Value And Sale Cost

No definition available.

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Namespace Prefix:	csr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The number of properties sold during the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	csr_
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Balance Type:	na
Period Type:	duration

- Definition

Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount before tax of gain (loss) recognized on the sale or disposal of a disposal group. Excludes discontinued operations.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 5
-URI https://asc.fasb.org/extlink&oid=126905981&loc=d3e2443-110228

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Indicates line item in statement of income that includes gain (loss) recognized on sale or disposal of disposal group. Excludes discontinued operation.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (d)
-URI https://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

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.

+ References

No definition available.

+ Details

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- Details

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- Details

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- Details

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