Most management companies charge a percentage of gross rents collected; typically between 3 and 15 percent. (sapling.com)
All this on top of a flat dollar amount per door or percent of gross rent collected. (jturner.ca)
For example, consider a $ 100,000 property that brings in $ 9,600 per year in net income (net means gross rents collected, less expenses, such as property taxes, insurance, maintenance, and property management). (noradarealestate.com)