Lot area per family:
Every dwelling shall provide a lot of not less than 8,400 square feet per family for single-family dwellings, or less than 12,000 square feet for two-family dwellings, provided that where a lot has less area than herein required, in separate ownership and conforming with previous zoning ordinances of the City of Garden City at the time of the passage of the ordinance, this regulation shall not prohibit the erection of a one-family dwelling; but further provided that, where a public or community sewer is not available and in use for the disposal of all sanitary sewage from the premises, each minimum lot area shall be not less than 15,000 square feet as required by Missouri Clean Water Commission.