These districts are intended as single-family residential areas with detached units with low to medium population densities. Use regulations for the single family districts are identical, but contain two classes of lot width and lot area, and these dimensional differences are intended to be preserved. Certain structures and uses required to serve governmental, educational, religious, noncommercial recreational and other needs of those areas are permitted outright within such districts or are permissible as special exceptions subject to restrictions and requirements intended to preserve and protect the single family residential character of the district.