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REAL ESTATE INVESTMENTS - Future Minimum Contractual Rent Payments Due under Noncancelable Operating Leases (FY) (Details) - USD ($)
Jun. 30, 2021
Dec. 31, 2020
Real Estate [Abstract]    
2021 $ 25,533,893 $ 26,761,843
2022 22,070,671 24,418,710
2023 21,588,111 20,157,378
2024 18,369,437 19,674,819
2025 11,524,427 16,456,145
Thereafter 42,329,568 43,827,967
Total $ 154,635,652 $ 151,296,862