1133.03 MINIMUM GROUND FLOOR AREA.
   (a)    Single-Family Residential.
      (1)    One Story Dwellings. A one-story dwelling shall contain not less than 900 square feet of usable ground floor area, exclusive of open porches, garages, carports or steps.
      (2)    One and One-Half and Two Story Dwellings. A story and one-half or a two-story dwelling, shall contain not less than 650 square feet of ground floor area, exclusive of open porches, garages, carports or steps.
   (b)    Apartment Units.
      (1)    One Story Dwellings. A one-story dwelling shall contain not less than 500 square feet of usable ground floor area, exclusive of open porches, garages, carports or steps.
      (2)    One and One-Half and Two Story Dwellings. A story and one-half or a two-story dwelling, shall contain not less than 500 square feet of ground floor area, exclusive of open porches, garages, carports or steps.