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INVESTMENTS IN UNCONSOLIDATED ENTITIES (FY) (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jan. 01, 2017
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Sep. 28, 2017
Schedule of Equity Method Investments [Line Items]                
Income (Loss) from Equity Method Investments   $ (55,955) $ (38,606) $ (129,988) $ (93,485) $ (226,024) $ (199,233)  
Proceeds from Distributions Received from Real Estate Partnerships           623,406 95,158  
The TIC Interest                
Schedule of Equity Method Investments [Line Items]                
Capitalized costs, equity method investments           626,073    
Ownership (as a percent)               72.70%
Income (Loss) from Equity Method Investments           $ (269,191) $ (30,038)  
Rich Uncles Real Estate Investment Trust I ("REIT I")                
Schedule of Equity Method Investments [Line Items]                
Ownership (as a percent)           4.80% 4.40% 72.70%
Income (Loss) from Equity Method Investments $ (109,309)         $ 43,167 $ (169,195)  
Proceeds from Distributions Received from Real Estate Partnerships           $ 273,264 $ 272,528  
Santa Clara                
Schedule of Equity Method Investments [Line Items]                
Ownership Percentage by Noncontrolling Owners (as a percent)               27.30%
Hagg Lane II, LLC | The TIC Interest                
Schedule of Equity Method Investments [Line Items]                
Ownership Percentage by Noncontrolling Owners (as a percent)               23.40%
Hagg Lane III, LLC | The TIC Interest                
Schedule of Equity Method Investments [Line Items]                
Ownership Percentage by Noncontrolling Owners (as a percent)               3.90%