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DEBT - Interest Expense (Q2) (Details) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]            
Interest expense $ 2,098,649 $ 2,558,877 $ 3,879,785 $ 6,463,533 $ 11,460,747 $ 7,382,610
Amortization of deferred financing costs         1,025,093 638,200
Prepayment penalties 0 0 (517,000) 0    
Loss on interest rate swaps (90,600) 7,785 (517,719) 1,292,752 770,898 820,496
Other 9,182 8,904 49,118 65,228    
Accrued interest payable 55,180   55,180   45,636 22,282
Mortgage Notes Payable            
Debt Instrument [Line Items]            
Interest expense 1,992,812 2,129,678 3,826,636 4,300,183 8,470,248 5,698,606
Amortization of deferred financing costs 103,383 139,600 214,426 258,631 937,564 601,658
Prepayment penalties 0 0 23,900 47,000    
Loss on interest rate swaps (92,200) 70,985 (420,243) 1,395,697 1,172,781 843,174
Credit Facility            
Debt Instrument [Line Items]            
Interest expense 63,333 166,834 142,085 321,458 527,047 190,130
Amortization of deferred financing costs $ 22,139 $ 42,876 $ 43,863 $ 75,336 $ 128,171 $ 36,542