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MORTGAGE LOANS AND NOTES PAYABLE - Summary (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Mortgage loans and Notes payable
Principal amount of debt	$ 2,800,000	$ 2,800,000
Total mortgage loans and notes payable	205,915	128,186
Net book value of self-storage facilities	6,038,186	5,951,236	$ 6,048,003
Mortgage Loans
Mortgage loans and Notes payable
Carrying value	204,471
Principal amount of debt	204,471	121,368
Plus: Unamortized fair value adjustment	6,137	7,689
Less: Loan procurement costs, net	(4,693)	(871)
Total mortgage loans and notes payable	205,915	128,186
Net book value of self-storage facilities used to secure debt	$ 403,900	356,100
Annapolis I, MD \| Mortgage Loans
Mortgage loans and Notes payable
Carrying value		4,703
Effective interest rate (as a percent)	3.78%
Brooklyn XV, NY \| Mortgage Loans
Mortgage loans and Notes payable
Carrying value		14,746
Effective interest rate (as a percent)	2.15%
Long Island City IV, NY \| Mortgage Loans
Mortgage loans and Notes payable
Carrying value		11,946
Effective interest rate (as a percent)	2.15%
Long Island City II, NY \| Mortgage Loans
Mortgage loans and Notes payable
Carrying value	$ 17,368	17,834
Effective interest rate (as a percent)	2.25%
Long Island City III, NY \| Mortgage Loans
Mortgage loans and Notes payable
Carrying value	$ 17,371	17,839
Effective interest rate (as a percent)	2.25%
Allen, TX \| Mortgage Loans
Mortgage loans and Notes payable
Carrying value	$ 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
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 interest acquired	85.00%