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MORTGAGE LOANS AND NOTES PAYABLE - Summary (Details) - USD ($) $ in Thousands	Mar. 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	161,711	162,918
Net book value of self-storage facilities	6,013,813	6,048,003
Mortgage Loans
Mortgage loans and Notes payable
Carrying value	153,321
Plus: Unamortized fair value adjustment	9,556
Less: Loan procurement costs, net	(1,166)	(1,269)
Total mortgage loans and notes payable	161,711	162,918
Net book value of self-storage facilities	$ 440,800	442,900
Revolver
Mortgage loans and Notes payable
Effective interest rate (as a percent)	5.90%
Nashville V, TN | Mortgage Loans
Mortgage loans and Notes payable
Carrying value	$ 2,133	2,148
Effective interest rate (as a percent)	3.85%
New York, NY | Mortgage Loans
Mortgage loans and Notes payable
Carrying value	$ 28,492	28,669
Effective interest rate (as a percent)	3.51%
Annapolis I, MD | Mortgage Loans
Mortgage loans and Notes payable
Carrying value	$ 4,856	4,906
Effective interest rate (as a percent)	3.78%
Brooklyn XV, NY | Mortgage Loans
Mortgage loans and Notes payable
Carrying value	$ 15,005	15,093
Effective interest rate (as a percent)	2.15%
Long Island City IV, NY | Mortgage Loans
Mortgage loans and Notes payable
Carrying value	$ 12,188	12,270
Effective interest rate (as a percent)	2.15%
Long Island City II, NY | Mortgage Loans
Mortgage loans and Notes payable
Carrying value	$ 18,170	18,283
Effective interest rate (as a percent)	2.25%
Long Island City III, NY | Mortgage Loans
Mortgage loans and Notes payable
Principal amount of debt	$ 153,321	153,959
Carrying value	$ 18,177	18,290
Effective interest rate (as a percent)	2.25%
Flushing II, NY | Mortgage Loans
Mortgage loans and Notes payable
Carrying value	$ 54,300	54,300
Plus: Unamortized fair value adjustment	$ 9,556	$ 10,228
Effective interest rate (as a percent)	2.15%

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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