In those cases where setback lines have not been established or where they are established by subdivision maps or regulations of a particular zone or as shown on the official line map, said lines may be so established or changed by the adoption of an ordinance in accordance with the procedures set forth in CVMC 19.12.030 for a change of zoning. (Ord. 3153 § 2 (Exh. A), 2010; Ord. 1214 § 1; Ord. 1212 § 1, 1969; prior code § 33.120(4)).