Oregon's 1973 "urban growth boundary" law limits the boundaries for large-scale development in each metropolitan area in Oregon. This limits access to utilities such as sewage, water and telecommunications, as well as coverage by fire, police and schools. Originally this law mandated the city must maintain enough land within the boundary to provide an estimated 20 years of growth; however, in 2007 the legislature changed the law to require the maintenance of an estimated 50 years of growth within the boundary, as well as the protection of accompanying farm and rural lands. The growth boundary, along with efforts of the Portland Development Commission to create economic development zones, has led to the development of a large portion of downtown, a large number of mid- and high-rise developments, and an overall increase in housing and business density.