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Schedule III Real Estate Assets and Accumulated Depreciation and Amortization - Accumulated Depreciation (FY) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Real estate investments:    
Balance at beginning of year $ 423,947,488 $ 235,212,009
Acquisitions 0 185,446,483
Improvements to real estate 673,631 3,288,996
Dispositions (26,575,397) 0
Held for sale (26,230,247) 0
Impairment of real estate (10,267,625) 0
Balance at end of year 361,547,850 423,947,488
Accumulated depreciation and amortization:    
Balance at beginning of year (20,411,794) (10,563,664)
Depreciation and amortization (15,759,199) (9,848,130)
Dispositions 2,435,274 0
Held for sale 1,644,508 0
Balance at end of year $ (32,091,211) $ (20,411,794)