Growth has somewhat stabilized since the 1990s, with smaller increases and less development. However, the main reason for this is not a lack of population growth, but loss of land. Lower Bucks now lacks large parcels of land to develop. Smaller residential and commercial projects must now be constructed. However, redevelopment of existing building sites is now a leading coalition in Lower Bucks. Many areas along the Delaware River have surpluses of abandoned industry, so many municipalities have granted building rights to luxury housing developers. Also, as the regions that began the suburban boom in Bucks, such as Levittown, begin to reach their 50th anniversaries, many commercial strips and other neglected structures are being torn down to be replaced with new shopping plazas and commercial chains. Also, with rising property values, areas with older construction are undergoing a renaissance. At the same time, Central and Upper Bucks are still seeing rapid growth, with many municipalities doubling their populations.