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INVESTMENTS IN UNCONSOLIDATED REAL ESTATE ENTITIES (Details) $ in Thousands |  |  | 1 Months Ended |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2025 USD ($) | Feb. 04, 2025 USD ($) | May 31, 2023 USD ($) | Oct. 31, 2019 USD ($) | Mar. 31, 2025 store | Mar. 31, 2025 | Mar. 31, 2025 property | Dec. 31, 2024 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Number of Stores | property |  |  |  |  |  |  | 439 |
Investment balance | $ 1,244,752 |  |  |  |  |  |  | $ 1,257,019
Investments in unconsolidated real estate entities | 1,320,849 |  |  |  |  |  |  | 1,332,338
Cash distributions in unconsolidated real estate ventures | (76,097) |  |  |  |  |  |  | (75,319)
PRISA Self Storage LLC |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Number of Stores | property |  |  |  |  |  |  | 85 |
Equity Ownership % |  |  |  |  |  | 4.00% |  |
Excess Profit % |  |  |  |  |  | 4.00% |  |
Investment balance | 8,640 |  |  |  |  |  |  | 8,967
HF1 Sovran HHF Storage Holdings LLC |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Number of Stores | property |  |  |  |  |  |  | 37 |
Equity Ownership % |  |  |  |  |  | 49.00% |  |
Investment balance | 302,982 |  |  |  |  |  |  | 304,526
HF1 Sovran HHF Storage Holdings LLC | Minimum |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Excess Profit % |  |  |  |  |  | 49.00% |  |
HF1 Sovran HHF Storage Holdings LLC | Maximum |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Excess Profit % |  |  |  |  |  | 59.00% |  |
Storage Portfolio II JV LLC |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Number of Stores | property |  |  |  |  |  |  | 36 |
Equity Ownership % |  |  |  |  |  | 10.00% |  |
Excess Profit % |  |  |  |  |  | 30.00% |  |
Investment balance | (9,777) |  |  |  |  |  |  | (9,584)
Storage Portfolio IV JV LLC |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Number of Stores | property |  |  |  |  |  |  | 32 |
Equity Ownership % |  |  |  |  |  | 10.00% |  |
Excess Profit % |  |  |  |  |  | 30.00% |  |
Investment balance | 46,832 |  |  |  |  |  |  | 47,150
Storage Portfolio I LLC |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Number of Stores | property |  |  |  |  |  |  | 24 |
Equity Ownership % |  |  |  |  |  | 34.00% |  |
Excess Profit % |  |  |  |  |  | 49.00% |  |
Investment balance | (43,913) |  |  |  |  |  |  | (43,803)
PR II EXR JV LLC |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Number of Stores |  |  |  |  | 6 |  | 0 |
Equity Ownership % |  |  |  |  |  | 25.00% |  |
Excess Profit % |  |  |  |  |  | 25.00% |  |
Investment balance | $ 0 |  |  |  |  |  |  | 105,909
Number of properties exchanged | store |  |  |  |  | 17 |  |  |
Number of stores in portfolio | store |  |  |  |  | 23 |  |  |
Ownership percentage after transaction | 100.00% |  |  |  |  |  |  |
PR II EXR JV LLC | Partner |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Number of Stores | store |  |  |  |  | 17 |  |  |
Number of properties exchanged | store |  |  |  |  | 6 |  |  |
HF2 Sovran HHF Storage Holdings II LLC |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Number of Stores | property |  |  |  |  |  |  | 22 |
Equity Ownership % |  |  |  |  |  | 49.00% |  |
Investment balance | $ 113,180 |  |  |  |  |  |  | 114,034
HF2 Sovran HHF Storage Holdings II LLC | Minimum |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Excess Profit % |  |  |  |  |  | 49.00% |  |
HF2 Sovran HHF Storage Holdings II LLC | Maximum |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Excess Profit % |  |  |  |  |  | 59.00% |  |
HF5 Life Storage-HIERS Storage LLC |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Number of Stores | property |  |  |  |  |  |  | 17 |
Equity Ownership % |  |  |  |  |  | 20.00% |  |
Excess Profit % |  |  |  |  |  | 20.00% |  |
Investment balance | 25,047 |  |  |  |  |  |  | 25,192
HF6 191 V Life Storage Holdings LLC |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Number of Stores | property |  |  |  |  |  |  | 17 |
Equity Ownership % |  |  |  |  |  | 20.00% |  |
Excess Profit % |  |  |  |  |  | 20.00% |  |
Investment balance | 10,532 |  |  |  |  |  |  | 10,821
ESS-CA TIVS JV LP |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Number of Stores | property |  |  |  |  |  |  | 16 |
Equity Ownership % |  |  |  |  |  | 55.00% |  |
Investment balance | 27,097 |  |  |  |  |  |  | 27,217
ESS-CA TIVS JV LP | Minimum |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Excess Profit % |  |  |  |  |  | 55.00% |  |
ESS-CA TIVS JV LP | Maximum |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Excess Profit % |  |  |  |  |  | 65.00% |  |
VRS Self Storage, LLC |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Number of Stores | property |  |  |  |  |  |  | 16 |
Equity Ownership % |  |  |  |  |  | 45.00% |  |
Excess Profit % |  |  |  |  |  | 54.00% |  |
Investment balance | (17,913) |  |  |  |  |  |  | (17,557)
HF10 Life Storage HHF Wasatch Holdings LLC |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Number of Stores | property |  |  |  |  |  |  | 16 |
Equity Ownership % |  |  |  |  |  | 20.00% |  |
Excess Profit % |  |  |  |  |  | 20.00% |  |
Investment balance | 18,913 |  |  |  |  |  |  | 19,295
Other unconsolidated real estate ventures |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Number of Stores | property |  |  |  |  |  |  | 121 |
Investment balance | 313,132 |  |  |  |  |  |  | 314,852
Other unconsolidated real estate ventures | Minimum |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Equity Ownership % |  |  |  |  |  | 10.00% |  |
Other unconsolidated real estate ventures | Maximum |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Equity Ownership % |  |  |  |  |  | 50.00% |  |
SmartStop Self Storage REIT, Inc. Preferred Stock |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Investment balance | 200,000 |  |  | $ 200,000 |  |  |  | 200,000
Investment, preferred dividend rate |  |  |  | 7.00% |  |  |  |
Period after which preferred stock dividend is subject to increase |  |  |  | 5 years |  |  |  |
Investment redemption restriction period |  |  |  | 5 years |  |  |  |
Strategic Storage Trust VI, Inc. Preferred Stock |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Investment balance | 150,000 |  |  |  |  |  |  | 150,000
Dividend rate, percentage |  |  | 8.35% |  |  |  |  |
Dividend rate increase, threshold |  |  | 5 years |  |  |  |  |
Redemption period |  |  | 3 years |  |  |  |  |
Investment in shares |  |  | $ 150,000 |  |  |  |  |
Strategic Storage Growth Trust III, Inc. Preferred Stock |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Investment balance | $ 100,000 |  |  |  |  |  |  | $ 0
Strategic Storage Growth Trust III, Inc. |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Investment balance |  | $ 100,000 |  |  |  |  |  |
Dividend rate, percentage |  | 8.85% |  |  |  |  |  |
Dividend rate increase, threshold |  | 5 years |  |  |  |  |  |
Redemption period |  | 5 years |  |  |  |  |  |

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