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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Operating Partnership, Purchase Allocation, Depreciation and Amortization (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Operating Partnership Ownership |  |  |
Increase (decrease) to OP units owned by third parties and a corresponding decrease to capital | $ (6,561) | $ (3,989) | $ 8,084
Purchase Price Allocation |  |  |
Amount of purchase price allocated to above- or below-market lease intangibles assumed at acquisition | 0 |  |
Depreciation and Amortization |  |  |
Write-off of fully depreciated real estate assets | 53,400 | 27,600 |
Write-off of fully amortized in-place lease intangible assets | 12,100 | 2,000 |
Impairment losses | $ 0 | 0 | 0
Minimum |  |  |
Depreciation and Amortization |  |  |
Useful lives of self-storage facilities and improvements | 5 years |  |
Maximum |  |  |
Depreciation and Amortization |  |  |
Useful lives of self-storage facilities and improvements | 39 years |  |
CubeSmart, L.P. and Subsidiaries |  |  |
Operating Partnership Ownership |  |  |
Increase (decrease) to OP units owned by third parties and a corresponding decrease to capital | $ (6,561) | $ (3,989) | $ 8,084

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