La. Stat. tit. 33 § 4725
The regulations, restrictions, and boundaries may, from time to time, be amended, supplemented, changed, modified or repealed. In case, however, of a protest against a change duly signed and acknowledged by the owners of twenty percent or more, either of the areas of land (exclusive of streets and alleys) included in a proposed change or within an area determined by lines drawn parallel to and two hundred feet distant from the boundaries of the district proposed to be changed, the amendment shall not become effective except by the favorable vote of a majority of the members of the legislative body of the municipality who are present and voting. The provisions of R.S. 33:4724 relative to public hearing and official notice shall apply equally to all changes or amendments.
Provided that no ordinance shall require a procedure or criteria for amendment any greater than that initially used upon the formation of regulations, restrictions and/or penalties.
La. R.S. § 33:4725