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Related Party Transactions - Summary of Related Party Carrying Value of Investments In Advances (Detail) - USD ($)
Mar. 31, 2023
Dec. 31, 2022
Related Party Transaction [Line Items]    
Total investments in and advances $ 78,222,349 $ 62,371,167
SSGT III OP    
Related Party Transaction [Line Items]    
Receivables 299,156 156,081
Total investments in and advances 4,701,500 22,320,768
SSGT III OP | SSGT III Mezzanine Loan    
Related Party Transaction [Line Items]    
Debt [1]   17,500,000
SSGT III OP | SSGT III OP Units and SSGT III SLP    
Related Party Transaction [Line Items]    
Equity 4,402,344 4,664,687
SST VI    
Related Party Transaction [Line Items]    
Receivables 5,736,245 1,828,989
Total investments in and advances 73,520,849 40,050,399
SST VI | SST VI Mezzanine Loan    
Related Party Transaction [Line Items]    
Debt [2] 50,000,000 35,000,000
SST VI | SST VI OP Units and SST VI SLP    
Related Party Transaction [Line Items]    
Equity 2,784,604 $ 3,221,410
SST VI | Preferred Units in SST VI OP    
Related Party Transaction [Line Items]    
Equity [3] $ 15,000,000  
[1]

(1) As of March 31, 2023 and December 31, 2022, $17.5 million was available to be drawn on the SSGT III Mezzanine Loan.

[2] As of March 31, 2023 and December 31, 2022, $5.0 million and $20.0 million, respectively, was available to be drawn on the SST VI Mezzanine Loan. On May 2, 2023, SST VI fully repaid the outstanding principal, plus all applicable accrued interest due on the SST VI Mezzanine Loan as of such date for a total amount of approximately $51.7 million.
[3] On May 2, 2023, SST VI fully redeemed SmartStop's preferred investment of 600,000 Series A Cumulative Redeemable Preferred units of limited partnership interest in SST VI OP, and repaid accrued distributions due as of the date of redemption for a total amount of approximately $15.1 million.