Nonresidential uses permitted in this zone shall be located in buildings designed for nonresidential uses; except, that such uses may be located in existing residential structures existing at the time of the adoption of the ordinance codified in this title, remodeled for said use and subject to site plan approval by the Planning Commission. Such buildings may be enlarged, providing that all provisions of this title are complied with. (Ord. 3153 § 2 (Exh. A), 2010; Ord. 1356 § 1, 1971; Ord. 1212 § 1, 1969; prior code § 33.506(H)(3)).