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REAL ESTATE INVESTMENTS, NET - Rental Payments for Operating Leases (Q2) (Details) - USD ($)
Jun. 30, 2021
Dec. 31, 2020
Real Estate [Abstract]    
July through December 2021 $ 13,219,545  
2022 25,533,893 $ 26,761,843
2023 22,070,671 24,418,710
2024 21,588,111 20,157,378
2025 18,369,437 19,674,819
2026 11,524,427 16,456,145
Thereafter 42,329,568 43,827,967
Total $ 154,635,652 $ 151,296,862