The Philadelphia City Council is considering an inclusionary zoning bill that aims to improve overall affordability amid rising housing costs. The measure would require developers to reserve 10 percent of new rental or for-sale units as affordable for households earning between 50 and 80 percent of the area’s median income. In addition, the measure would allow developers to pay a fee in lieu of on-site production into a city housing fund, offering them a density bonus. Advocates of inclusionary zoning argue that it preserves existing affordable housing and helps create new affordable units, while opponents argue that inclusionary zoning can make it too expensive to build in these areas. Multiple cities have explored or adopted inclusionary zoning policies, including Atlanta, Buffalo, Detroit, Nashville and Pittsburgh.