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Real Estate Owned, Net - Component of lease expense (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Ground Lease        
Real Estate        
Operating lease cost (1) $ 519,750 $ 316,125 $ 1,695,000 $ 948,375