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Real Estate - Acquisitions and Conversions - Additional Information (Details) - USD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Business Acquisition [Line Items]    
Capitalized acquisition costs $ 1,200,000 $ 1,300,000
Debt assumed 31,802,000 $ 0
Canton Marketplace [Member]    
Business Acquisition [Line Items]    
Mortgage assumed $ 31,800,000