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INVESTMENT ACTIVITY (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2024 USD ($) facility	Mar. 31, 2023 USD ($)	Dec. 31, 2023 USD ($) facility
Self-storage facilities
Right-of-use assets - operating leases	$ 50,179		$ 50,476
Self storage under construction
Self-storage facilities
Number of self-storage facilities | facility	4
Development costs	$ 57,300
Expected construction cost	$ 109,700
Self storage under construction | New York
Self-storage facilities
Number of self-storage facilities | facility	3
Self storage under construction | New Jersey
Self-storage facilities
Number of self-storage facilities | facility	1
2024 Acquisitions
Self-storage facilities
Number of self-storage facilities acquired | facility	2
Aggregate purchase price	$ 20,200
Intangible value of the in-place leases	$ 900
Estimated life	12 months
Amortization expense	$ 100
Purchase Price	$ 20,200
2023 Acquisitions
Self-storage facilities
Number of self-storage facilities acquired | facility			1
Aggregate purchase price			$ 22,000
Intangible value of the in-place leases			2,000
Estimated life	12 months
Amortization expense	$ 500	$ 0
Purchase Price			$ 22,000
2023 Acquisitions | New Jersey
Self-storage facilities
Number of self-storage facilities acquired | facility			1
2023 Dispositions
Self-storage facilities
Aggregate sale price			$ 8,000
2023 Dispositions | LAACO
Self-storage facilities
Aggregate sale price			800
Gain (loss) from sale of real estate			(200)
2023 Dispositions | Illinois
Self-storage facilities
Proceeds from involuntary conversion, net			8,000
Gain on involuntary conversion, net			$ (4,800)
Cubesmart
Self-storage facilities
Ownership interest by Parent	99.40%

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Amount of total construction cost expected of the projects.

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The current amount of expenditures for a real estate project that has not yet been completed.

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This element represents the amount of value allocated by a lessor (acquirer) to lease agreements which exist at acquisition of a leased property. Such amount may include the value assigned to existing tenant relationships and excludes the market adjustment component of the value assigned for above or below-market leases acquired.

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of lessee's right to use underlying asset under operating lease.

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