Minimum density zoning contrasts with the traditional approach to regulating maximum densities. By setting a minimum number of allowable units per acre or maximum lot sizes, zoning can be used to promote compact urban development patterns in areas targeted for higher density growth. For example, the Oregon Land Conservation and Development Commission (LCDC)’s Metropolitan Housing Rule specifically requires of local governments in metropolitan Portland: for cities with projected populations of less than 8,000, the overall housing density must be at least six units per net developed acre by the year 2000. Such a target can be met only by minimum density standards that are either used formally by regulation or informally in review processes. Case/Example: Metropolitan Housing Rule of Portland (OR). Source/Reference: Nelson and Duncan, 1995, pp. 83-84.