The purpose of the R-10,000 District is to provide for relatively smaller lot sizes (minimum 10,000 square feet) for residential dwellings, based on availability of public water and sewerage facilities. This would essentially permit more dwellings per acre and less open area than the R-20,000 Residence District. The district likewise provides for, where determined suitable, planned unit development wherein multifamily units may be provided as part of a housing mix.