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MORTGAGE LOANS AND NOTES PAYABLE - Summary (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Mortgage loans and Notes payable
Total mortgage loans and notes payable	$ 162,918	$ 167,676
Net book value of self-storage facilities	6,048,003	6,097,670	$ 4,505,814
Mortgage Loans
Mortgage loans and Notes payable
Principal amount of debt	153,959	156,385
Carrying value	153,959
Plus: Unamortized fair value adjustment	10,228	12,981
Less: Loan procurement costs, net	(1,269)	(1,690)
Total mortgage loans and notes payable	162,918	167,676
Net book value of self-storage facilities used to secure debt	442,900	450,700
Nashville V, TN | Mortgage Loans
Mortgage loans and Notes payable
Carrying value	$ 2,148	2,206
Effective interest rate (as a percent)	3.85%
New York, NY | Mortgage Loans
Mortgage loans and Notes payable
Carrying value	$ 28,669	29,340
Effective interest rate (as a percent)	3.51%
Annapolis I, MD | Mortgage Loans
Mortgage loans and Notes payable
Carrying value	$ 4,906	5,099
Effective interest rate (as a percent)	3.78%
Brooklyn XV, NY | Mortgage Loans
Mortgage loans and Notes payable
Carrying value	$ 15,093	15,423
Effective interest rate (as a percent)	2.15%
Long Island City IV, NY | Mortgage Loans
Mortgage loans and Notes payable
Carrying value	$ 12,270	12,580
Effective interest rate (as a percent)	2.15%
Long Island City II, NY | Mortgage Loans
Mortgage loans and Notes payable
Carrying value	$ 18,283	18,714
Effective interest rate (as a percent)	2.25%
Long Island City III, NY | Mortgage Loans
Mortgage loans and Notes payable
Carrying value	$ 18,290	18,723
Effective interest rate (as a percent)	2.25%
Flushing II, NY | Mortgage Loans
Mortgage loans and Notes payable
Carrying value	$ 54,300	$ 54,300
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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Amount of assets pledged to secure a debt instrument.

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