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COMMITMENTS AND CONTINGENCIES (Q2) (Details) - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Dec. 31, 2019
COMMITMENTS AND CONTINGENCIES [Line Items]      
Tenant reimbursements $ 189,136 $ 60,598 $ 98,329
Restricted cash $ 2,508,471 129,118 113,362
Termination period 10 days    
Lease Agreements      
COMMITMENTS AND CONTINGENCIES [Line Items]      
Restricted cash $ 2,400,000 92,684 $ 92,684
Building Improvements, Tenant Improvements And Leasing Commissions      
COMMITMENTS AND CONTINGENCIES [Line Items]      
Restricted cash   $ 92,684  
Maximum      
COMMITMENTS AND CONTINGENCIES [Line Items]      
Shares authorized to be repurchased per month (as a percent) 2.00% 2.00%  
Shares authorized to be repurchased per quarter (as a percent) 5.00% 5.00%