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MORTGAGE LOANS AND NOTES PAYABLE - Summary (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2025	Dec. 31, 2024
Mortgage loans and Notes payable
Principal amount of debt	$ 2,800,000	$ 2,800,000
Total mortgage loans and notes payable	205,500	205,915
Net book value of self-storage facilities	6,446,196	6,038,186
Mortgage Loans
Mortgage loans and Notes payable
Carrying value	204,170
Principal amount of debt	204,170	204,471
Plus: Unamortized fair value adjustment	5,736	6,137
Less: Loan procurement costs, net	(4,406)	(4,693)
Total mortgage loans and notes payable	205,500	205,915
Net book value of self-storage facilities	401,900	403,900
Long Island City II, NY | Mortgage Loans
Mortgage loans and Notes payable
Carrying value	$ 17,246	17,368
Effective interest rate (as a percent)	2.25%
Long Island City III, NY | Mortgage Loans
Mortgage loans and Notes payable
Carrying value	$ 17,247	17,371
Effective interest rate (as a percent)	2.25%
Allen, TX | Mortgage Loans
Mortgage loans and Notes payable
Carrying value	$ 7,377	7,432
Effective interest rate (as a percent)	6.29%
Dallas-Fort Worth, TX | Mortgage Loans
Mortgage loans and Notes payable
Carrying value	$ 108,000	108,000
Effective interest rate (as a percent)	6.23%
Flushing II, NY | Mortgage Loans
Mortgage loans and Notes payable
Carrying value	$ 54,300	$ 54,300
Effective interest rate (as a percent)	2.15%
Joint Venture
Mortgage loans and Notes payable
Percentage of voting interest acquired	85.00%	85.00%

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