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REAL ESTATE INVESTMENTS, NET - Narrative (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2019
property
state
Sep. 30, 2018
USD ($)
Real Estate [Line Items]      
Number of real estate properties   24  
Number of states in which entity operates | state   13  
Weighted-average remaining amortization period (in years)   7 years 3 months  
Retail      
Real Estate [Line Items]      
Number of real estate properties   9  
Office      
Real Estate [Line Items]      
Number of real estate properties   10  
Industrial      
Real Estate [Line Items]      
Number of real estate properties   5  
Land      
Real Estate [Line Items]      
Number of real estate properties   1  
3M      
Real Estate [Line Items]      
Acquisition related costs | $     $ 22,358
Acquisition fees      
Real Estate [Line Items]      
Fair value of assets acquired | $ $ 1,192,671   $ 2,121,798