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STORAGE PROPERTIES - Summary (Details) - USD ($) $ in Thousands | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
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STORAGE PROPERTIES |  |  |
Storage properties | $ 8,134,189 | $ 7,628,774 |
Less: Accumulated depreciation | (1,758,340) | (1,590,588) |
Storage properties, net | 6,375,849 | 6,038,186 | $ 5,951,236
Land |  |  |
STORAGE PROPERTIES |  |  |
Storage properties | 1,714,247 | 1,645,549 |
Buildings and improvements |  |  |
STORAGE PROPERTIES |  |  |
Storage properties | 6,203,371 | 5,759,848 |
Equipment |  |  |
STORAGE PROPERTIES |  |  |
Storage properties | 140,027 | 147,709 |
Construction in progress |  |  |
STORAGE PROPERTIES |  |  |
Storage properties | 34,599 | 33,723 |
Right-of-use assets - finance leases |  |  |
STORAGE PROPERTIES |  |  |
Storage properties | $ 41,945 | $ 41,945 |

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- Definition Amount of real estate investment property which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(1)(d)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(1)(6)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + Details
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- Definition Amount of real estate investment property, net of accumulated depreciation, which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(1)(d)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(1)(6)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + Details
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