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MORTGAGE LOANS AND NOTES PAYABLE - Summary (Details) - USD ($) $ in Thousands | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
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MORTGAGE LOANS AND NOTES PAYABLE |  |  |
Principal amount of debt | $ 2,950,000 | $ 2,800,000 |
Total mortgage loans and notes payable | 98,859 | 205,915 |
Net book value of self-storage facilities | 6,375,849 | 6,038,186 | $ 5,951,236
Mortgage Loans |  |  |
MORTGAGE LOANS AND NOTES PAYABLE |  |  |
Carrying value | 95,286 |  |
Principal amount of debt | 95,286 | 204,471 |
Plus: Unamortized fair value adjustment | 3,969 | 6,137 |
Less: Loan procurement costs, net | (396) | (4,693) |
Total mortgage loans and notes payable | 98,859 | 205,915 |
Net book value of self-storage facilities used to secure debt | 240,000 | 403,900 |
Long Island City II, NY | Mortgage Loans |  |  |
MORTGAGE LOANS AND NOTES PAYABLE |  |  |
Carrying value | $ 16,880 | 17,368 |
Effective interest rate (as a percent) | 2.25% |  |
Long Island City III, NY | Mortgage Loans |  |  |
MORTGAGE LOANS AND NOTES PAYABLE |  |  |
Carrying value | $ 16,880 | 17,371 |
Effective interest rate (as a percent) | 2.25% |  |
Allen, TX | Mortgage Loans |  |  |
MORTGAGE LOANS AND NOTES PAYABLE |  |  |
Carrying value | $ 7,226 | 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% |  |

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