For the purposes of determining either the livable portion of a dwelling unit or for calculating required parking, “living area” shall mean the gross horizontal areas of the several floors of a structure as measured from the exterior faces of the exterior walls or from the centerline of party walls separating two (2) structures, exclusive of parking or loading areas. (Ord. 1030 § 2(12), 2018; Ord. 687 § 4, 1983)