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SCHEDULE III REAL ESTATE AND RELATED DEPRECIATION (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Activity in Storage facilities |  |  |
Balance at beginning of year | $ 7,628,774 | $ 7,367,613 | $ 7,295,778
Acquisitions & improvements | 557,725 | 324,653 | 74,259
Fully depreciated assets | (53,372) | (27,573) | (29,133)
Dispositions and other | 186 | (632) | (4,717)
Construction in progress, net | 876 | (35,287) | 31,426
Balance at end of year | 8,134,189 | 7,628,774 | 7,367,613
Activity in Accumulated depreciation |  |  |
Balance at beginning of year | 1,590,588 | 1,416,377 | 1,247,775
Depreciation expense | 220,286 | 201,942 | 199,065
Fully depreciated assets | (53,372) | (27,573) | (29,133)
Dispositions and other | 838 | (158) | (1,330)
Balance at end of year | 1,758,340 | 1,590,588 | 1,416,377
Storage properties, net | 6,375,849 | $ 6,038,186 | $ 5,951,236
Aggregate cost of real estate investments for federal income tax purposes | $ 8,716,500 |  |

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- Definition Represents the amount that was removed from accumulated depreciation pertaining to real estate that was sold during the period. Also includes other decreases or increases in accumulated depreciation for the period. + References No definition available. + Details
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- Definition Represents the amount of real estate investments acquired and improvements made during the period. + References No definition available. + Details
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- Definition Represents the carrying amount of real estate sold during the period. Also includes other decrease (increase) in the carrying amount of real estate investments during the period. + References No definition available. + Details
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- Definition Represents the amount of fully depreciated assets of real estate for the period. + References No definition available. + Details
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- Definition Amount of accumulated depreciation pertaining to real estate investments for entities with a substantial portion of business acquiring and holding investment real estate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 970 -SubTopic 360 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28(Column F)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478979/970-360-S99-1 + Details
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- Definition Amount, before accumulated depreciation, of real estate investment by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate. Excludes real estate not held as investment or interest. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 970 -SubTopic 360 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28(Column E)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478979/970-360-S99-1 + Details
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