The base density of 1 to 3.5 units per acre in Low Density Residential areas may be increased through use of the PRUD overlay ordinance to provide neighborhoods with housing and lot size variety, clustered around common open space3 amenity areas.  Compared to Community Residential and Neighborhood Residential areas, a greater percentage of open space area should apply to Neighborhood Ag Heritage Overlay areas to provide for recreational activities, and to provide an option for a common garden area or professionally-operated ag-plot.  In a PRUD, the cost of maintaining open space is shared by more homeowners through a density bonus that requires high quality building materials and superior community design (see Chapter 6. Residential Neighborhoods with Variety and Amenities).