On lots one acre in area or larger, the maximum residential density shall be 14 dwelling units per acre when low- and moderate-income dwelling units are provided in accordance with this subsection. The minimum affordable housing set-aside shall be 20 percent of the dwelling units in the development, except that the minimum setaside shall be 15 percent where affordable rental units are provided. A minimum of 13 percent of the affordable units shall be affordable to households earning 30 percent or less of the area median income for the Council on Affordable Housing region.