In all Residence "A" Zones, the minimum livable or habitable area shall be one thousand (1,000) square feet for a one-story dwelling and one thousand four hundred (1,400) square feet for a two-story dwelling.

In all Residence "B" Zones, the minimum livable or habitable area shall be nine hundred (900) square feet for a one-story dwelling and one thousand two hundred (1,200) square feet for a two-story dwelling. In case of a lot existing at the time of the adoption of this chapter less than one hundred by one hundred (100 x 100) feet, the minimum livable or habitable area shall be seven hundred sixty-eight (768) feet for a one-story dwelling and one thousand (1,000) square feet for a two-story dwelling.

In all Residence "C" Zones, the minimum livable or habitable area for a one-family dwelling shall be seven hundred sixty-eight (768) square feet for a one-story dwelling and one thousand (1,000) square feet for a two-story dwelling. In the case of a multiple dwelling, the minimum livable or habitable area shall be seven hundred sixty-eight (768) square feet for each story.

Residential dwellings erected in business or industrial zones shall comply with the minimum livable or habitable area requirements for Residence "C" Zones.

Livable or habitable area shall be construed to mean floor space used for general living purposes. It shall not include porches, garages, or cellars or basements. Attic space with a ceiling of seven (7) feet or more and sloping to a height at the eaves of not less than four (4) feet from the floor to the underside of the rafters may be counted as livable or habitable area, providing the attic is finished and piping for water and heating have been installed.