Mixed-use development is the use of a building, set of buildings, or neighborhood for more than one purpose. Since the 1920's, zoning in some countries has required uses to be separated. However, when jobs, housing, and commercial activities are located close together, a community's transportation options increase. In addition, mixed-use developments often have higher property values. Often located in existing urban areas or as part of a new town center, mixed-use development provides a range of commercial and residential unit sizes and options. Leggat McCall Properties' involvement in transforming neighborhoods is evident in: