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Commitments and Contingencies - Narrative (Details)
9 Months Ended
Sep. 30, 2018
USD ($)
Restricted Cash | Minimum  
Commitments and Contingencies [Line Items]  
Replacement reserve escrow as percentage of property revenue 4.00%
Restricted Cash | Maximum  
Commitments and Contingencies [Line Items]  
Replacement reserve escrow as percentage of property revenue 5.00%
Management fees  
Commitments and Contingencies [Line Items]  
Maximum percentage of project budget to be paid as market service fees 16.50%
Management fees | Minimum  
Commitments and Contingencies [Line Items]  
Property management fee, percent 2.00%
Management fees | Maximum  
Commitments and Contingencies [Line Items]  
Property management fee, percent 7.00%
Management fees  
Commitments and Contingencies [Line Items]  
Portion of project management fees to project costs 4.00%
Management fees | Minimum  
Commitments and Contingencies [Line Items]  
Monthly property management fee $ 14,000
Property management fee, percent 3.00%