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City of Arden Hills – 2030 Comprehensive Plan Approved: September 28, 2009 6-13 6.4.8 Development Capacity and Net Residential Density The Metropolitan Council’s 2030 Regional Development Framework requires an average net residential density of at least three units per net residential acre. Densities lower than this are not an efficient use of the region’s sanitary sewer infrastructure. Net residential acreage is calculated by subtracting wetlands, water bodies, public parks, arterial streets, and identified natural resources that are protected by ordinance from gross acres. The number of net residential acres is then divided by the number of lots to determine net residential density. According to the 2005 land use data provided by the Metropolitan Council, there were 1,318 acres of net residential land in Arden Hills, which includes the rights- of-way of adjacent City streets. The United States Census Bureau lists 3,017 housing units in Arden Hills in 2000. Based on that information, the residential density in the developed portion of Arden Hills is approximately 2.29 residential units per net residential acre. While this is below the three units per net residential acre required by the Metropolitan Council, the City is not required to raise densities in the built portion of Arden Hills. However, all future land uses should be able to accommodate development in average of three units per net residential acre. There are no expected land use changes that would result in a reduction in net residential density in the developed part of Arden Hills. Furthermore, the remaining vacant residential land that is south of Highway 96 and 10 is already zoned for development that could be built at a density of an average of three residential units per acre. The approved Master Plan for the TCAAP property includes 151 acres of residential land and a maximum of 1,431 residential units for an overall maximum gross density of 9.48 units per acre. The gross density includes the neighborhood collector roads; however, it excludes parks, arterial roads, and the water infrastructure. The unapproved concept plan for the TCAAP property includes 168 acres of residential area and 1,750 residential units for a preliminary average density of 10.4 units per net residential acre. This density is only preliminary because wetlands, parks, and protected natural areas have not been removed from the 168 acres that are anticipated to be used for residential development. The densities in the residential areas will be varied to allow for a variety of housing types.