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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - RESTRICTED CASH AND INVESTMENT SECURITIES (Details)
1 Months Ended 12 Months Ended
Jul. 31, 2019
USD ($)
Jun. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
property
Dec. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
Restricted Cash          
Restricted Cash     $ 128,430,049 $ 6,508,131 $ 18,889,509
Mortgage loan originated     34,570,000 $ 3,000,000  
Investment Securities          
Available-for-sale Securities, Debt Securities         $ 0
First Mortgage          
Restricted Cash          
Mortgage loan originated $ 8,300,000 $ 8,000,000      
Escrow deposit to be reinvested through like-kind exchange structure          
Restricted Cash          
Restricted Cash     125,700,000    
Restricted cash, escrow deposit related to land transactions          
Restricted Cash          
Restricted Cash     156,000    
Restricted cash, escrow deposit related to other income properties          
Restricted Cash          
Restricted Cash   $ 746,000 275,000    
Capital replacement reserve account          
Restricted Cash          
Restricted Cash     $ 261,000    
Number of real estate properties in financing | property     6    
Restricted cash, escrow for general tenant improvements          
Restricted Cash          
Restricted Cash     $ 1,300,000