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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, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Operating Partnership Ownership |  |  |
Increase (decrease) to OP units owned by third parties and a corresponding decrease to capital | $ (27,203) | $ 164,109 | $ 4,230
Purchase Price Allocation |  |  |
Amount of purchase price allocated to above- or below-market lease intangibles | 0 |  |
Depreciation and Amortization |  |  |
Write-off of fully depreciated real estate assets | 32,300 | 52,700 |
Write-off of fully amortized in-place lease intangible assets | 121,600 | 59,900 |
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 | $ (27,203) | $ 164,109 | $ 4,230

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