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INVESTMENTS IN UNCONSOLIDATED ENTITIES - Entities Equity In Earnings (Q2) (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Investment [Line Items]            
Income from investments in unconsolidated entities, net $ 55,955 $ 38,606 $ 129,988 $ 93,485 $ 226,024 $ 199,233
Payable to TIC [Member]            
Investment [Line Items]            
Income from investments in unconsolidated entities, net 71,703 70,907 152,063 120,687    
Rich Uncles Real Estate Investment Trust 1            
Investment [Line Items]            
Income from investments in unconsolidated entities, net $ (15,748) $ (32,301) $ (22,075) $ (27,202)