The city commission may, from time to time, on its own motion or on petition, after public notice and hearing, amend the regulations and districts established in this title. Every such proposed amendment shall be referred by the city commission to the planning and zoning commission for report. Any such amendment that has failed to receive the approval of the planning and zoning commission shall not be passed by the city commission except by three-fourths vote. If a protest against such amendment is presented, signed by the owners of twenty percent of the land within such area proposed to be altered, or by owners of twenty percent or more of the area of the lots immediately abutting either side of the territory included in such proposed change, or separated therefrom only by an alley or street, such amendment shall not be passed except by the favorable vote of three-fourths of the city commission. If such amendment will transfer an area of less restrictive use and protest is presented by the owners of twenty percent of the land adjacent to and within one hundred feet from such area proposed to be transformed, such amendment shall not be passed except by a three-fourths vote of the city commission. (Amended during 1992 codification: prior code § 11-3-13)