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Real Estate Facilities - Schedule of Activity in Real Estate Facilities (Detail) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2021 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Real estate facilities |  |  |  |  |  |  |
Real estate facilities, beginning balance |  | $ 1,210,102,582 | $ 1,593,623,628 |  | $ 1,210,102,582 |  |
Facility acquisitions |  | 371,507,610 | 298,341,568 |  | 47,162,974 |  | $ 0
Impact of foreign exchange rate changes |  |  | (12,984,154) |  | (138,457) |  | 4,147,798
Improvements and additions |  |  | 8,224,603 | [1] | 12,151,893 | [2] |
Other facility acquisitions |  |  | 69,981,850 | [3] | 15,689,143 |  |
Disposition due to deconsolidation | [4] |  |  |  | (15,689,143) |  |
Acquisitions, additions and other | [4] |  |  |  | 15,689,143 |  |
Real estate facilities, ending balance |  |  | 1,887,205,645 |  | 1,593,623,628 |  | 1,210,102,582
Accumulated depreciation |  |  |  |  |  |  |
Accumulated depreciation, beginning balance |  | $ (115,903,045) | (155,926,875) |  | (115,903,045) |  | (83,692,491)
Depreciation expense |  |  | (48,400,073) |  | (40,158,233) |  | (31,711,102)
Impact of foreign exchange rate changes |  |  | 1,644,260 |  | 71,937 |  | (499,452)
Disposition due to deconsolidation | [4] |  |  |  | 62,466 |  |
Accumulated depreciation, ending balance |  |  | (202,682,688) |  | (155,926,875) |  | $ (115,903,045)
SST IV Merger Agreement |  |  |  |  |  |  |
Real estate facilities |  |  |  |  |  |  |
Facility acquisitions |  |  |  |  | $ 324,344,636 |  |
SSGT II Merger Agreement |  |  |  |  |  |  |
Real estate facilities |  |  |  |  |  |  |
Facility acquisitions |  |  | $ 228,359,718 |  |  |  |
[1] | Included herein consists of approximately $1.0 million of solar panel installations, the remainder being comprised of other general capital improvements.
[2] | Included herein is an addition to our Riverview, Florida property of approximately $2.3 million, which added approximately 25,400 net rentable square feet and approximately 150 additional units, and opened in June of 2021. The remainder consists primarily of solar panel installations, LED lighting conversions, and other general capital improvements.
[3] | Such amount includes four individual property acquisitions completed during the year ended December 31, 2022.
[4] | Such activity primarily represents the acquisition of a property completed by SST VI OP, which as of the acquisition date was consolidated within our consolidated financial statements. On May 1, 2021, we deconsolidated SST VI OP as we were no longer the primary beneficiary, which resulted in the removal of such facility from our consolidated balance sheet. Our investment in SST VI OP is now included within “Investments in and advances to managed REITs” within our consolidated balance sheet.

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- Definition Amount of increase in real estate investments related to improvements for entities with a substantial portion of business acquiring and holding investment real estate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 970 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28(Footnote 4)) -URI https://asc.fasb.org/extlink&oid=120402810&loc=d3e638233-123024 + Details
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