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RELATED PARTY TRANSACTIONS - Narative (Q2) (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended 7 Months Ended 12 Months Ended
Jan. 31, 2019
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Aug. 02, 2018
Dec. 31, 2018
Dec. 31, 2017
Related Party Transaction [Line Items]                
Due to Related Parties   $ 30,282   $ 30,282     $ 979,174 $ 907,377
Property Management Fees (as a percent)       1.50%     1.50%  
Revenue from Contract with Customer, Including Assessed Tax   5,896,266 $ 4,383,966 $ 11,781,711 $ 7,841,944      
Leasing Commissions And Fees, Percentage       6.00%     6.00%  
Leasing Commission Fee, Renewal Rate       3.00%     3.00%  
Common Class C                
Related Party Transaction [Line Items]                
Stock Issued During Period   $ 55,000 $ 43,215 $ 105,000 $ 81,405      
Stock Issued During Period (in shares)   5,414 4,300 10,335 8,100      
Sponsor                
Related Party Transaction [Line Items]                
Reimbursements Expense       $ (40,915)        
Organizational And Offering Costs Incurred       8,815,104        
Employment Contracts                
Related Party Transaction [Line Items]                
Reimbursements Expense       $ 99,945        
Advisor                
Related Party Transaction [Line Items]                
Financing Coordination Fees Percentage (as a percent)       1.00%     1.00%  
Reimbursable organizational and offering expenses                
Related Party Transaction [Line Items]                
Accrual organization and offering cost   $ 5,092,718   $ 5,092,718     $ 4,215,004  
Maximum liability for organizational and offering costs       5,120,687     1,503,062 1,986,147
Due to Related Parties   27,969   27,969     $ 13,168 15,945
Related Party Transaction Expenses   0 $ 386,053 $ 0 $ 816,297      
Reimbursable organizational and offering expenses | Sponsor                
Related Party Transaction [Line Items]                
Gross Offering Proceeds Percentage       3.00%     0.00%  
Waiver of Assets Management Fees                
Related Party Transaction [Line Items]                
Maximum liability for organizational and offering costs             $ 0 143,540
Due to Related Parties             $ 0 0
Payroll expense reimbursements with Related Party   0     0     143,540
Management Fees Waive Percentage (as a percent)       0.025%     0.025%  
Waiver of Assets Management Fees | Advisor                
Related Party Transaction [Line Items]                
Revenue from Contract with Customer, Including Assessed Tax   47,977 47,977 $ 95,953 95,953      
Financing coordination fees                
Related Party Transaction [Line Items]                
Maximum liability for organizational and offering costs             $ 262,050 326,600
Due to Related Parties   0   0     0 0
Related Party Transaction Expenses   0 0 63,500 209,550      
Asset Management Fees                
Related Party Transaction [Line Items]                
Maximum liability for organizational and offering costs             2,004,760 872,281
Due to Related Parties   0   0     0 567,661
Payroll expense reimbursements with Related Party   680,018 477,915 1,360,037 879,230      
Related Party Transaction Expenses   680,019 477,915 1,360,037 879,230      
Subordinated participation fees                
Related Party Transaction [Line Items]                
Maximum liability for organizational and offering costs             839,050 315,802
Due to Related Parties   0   0     $ 839,050 $ 315,802
Related Party Transaction Expenses   0 0 0 0      
Sponsor reimbursement                
Related Party Transaction [Line Items]                
Payroll expense reimbursements with Related Party   $ 143,997 $ 242,416 $ 272,911 $ 553,508      
Advisor fees, Acquisition fees [Member]                
Related Party Transaction [Line Items]                
Related Party Transaction, Rate 0.10%     3.00%   3.00% 0.10%  
Property Selling Fee [Member]                
Related Party Transaction [Line Items]                
Related Party Transaction, Rate       3.00%     3.00%  
Disposition Fees [Member]                
Related Party Transaction [Line Items]                
Related Party Transaction, Rate       6.00%     6.00%  
Maximum | Reimbursable organizational and offering expenses                
Related Party Transaction [Line Items]                
Due to Related Parties             $ 4,228,172  
Maximum | Advisor fees, Acquisition fees [Member]                
Related Party Transaction [Line Items]                
Related Party Transaction, Rate       6.00%     6.00%