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Real Estate Owned, Net - Cash information related to the ground lease (Details) - USD ($)
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Real Estate [Abstract]    
Operating cash flows from operating leases $ 1,695,000 $ 948,375
Right-of-use assets obtained in exchange for lease obligations, Operating leases $ 1,695,000 $ 948,375