FLOOR AREA, HABITABLE — The area of that portion of a building or structure designed, intended, heated, and furnished for year-round human occupancy, measured on each floor from the building’s exterior walls and including the full horizontal area of each floor of the building, regardless of whether or not an actual floor extends throughout it. For the top-most story or half-story, habitable floor area shall include all finished areas measuring five feet in height and/or greater, measured from the top of the finished floor to the finished ceiling, or where there is not a finished ceiling to the top of the roof rafters. Habitable floor area shall not include that portion of a finished attic equal to not more than 1/3 the area of the floor below. Habitable floor area shall not include that portion of an attached unheated garage floor area as follows:
RS-6, RS-8 and RS-10 Zones: Up to but not exceeding 250 square feet;
RS-12, RS-16, RS-24, and RS-40 Zones: Up to but not exceeding 450 square feet;
Single-family residential uses in detached single-family residential structures in the RM-6, RM-6D, and RM-8 Zones: Up to but not exceeding 250 square feet;
Single-family residential uses in detached single-family residential structures in the RM-12 Zone: Up to but not exceeding 450 square feet.