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INVESTMENT IN UNCONSOLIDATED REAL ESTATE VENTURES - Condensed Financial Position (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
ASSETS                
Self storage properties $ 5,841,786     $ 5,864,134        
Less accumulated depreciation (1,175,690)     (1,051,638)        
Self storage properties, net 4,666,096     4,812,496        
Other assets 189,055     218,482        
Total assets 5,142,302     5,354,462        
LIABILITIES AND EQUITY                
Debt financing 3,403,399     3,449,087        
Equity 1,582,041 $ 1,637,682 $ 1,692,192 1,763,347 $ 1,800,888 $ 1,817,065 $ 1,947,072 $ 2,125,841
Total liabilities and equity 5,142,302     5,354,462        
Joint Venture | Equity Method Investment, Nonconsolidated Investee or Group of Investees                
ASSETS                
Self storage properties 2,758,743     2,700,632        
Less accumulated depreciation (505,615)     (445,006)        
Self storage properties, net 2,253,128     2,255,626        
Other assets 41,552     43,513        
Total assets 2,294,680     2,299,139        
LIABILITIES AND EQUITY                
Debt financing 1,214,036     1,213,169        
Other liabilities 36,922     37,206        
Equity 1,043,722     1,048,764        
Total liabilities and equity $ 2,294,680     $ 2,299,139