The Board of Aldermen may from time to time on its own action, or on petition after public notice and hearings thereon, as provided herein, amend, supplement, modify, change, or repeal the regulations and restrictions as established herein. Before taking any action upon any proposed amendment, supplement, modification, or change, the same may be referred by the Board of Aldermen to the Planning and Zoning Commission for hearing and report.

No action on an amendment, change, modification or repeal shall be taken until after a public hearing is held before the Planning and Zoning Commission in relation thereto, such public hearing may be called by the Planning and Zoning Commission, the Mayor, or the Board of Aldermen, at which parties in interest and citizens shall have an opportunity to be heard. At least fifteen (15) days' notice of the time and place of such hearing shall be published in a paper of general circulation in the City of Pleasant Valley, Missouri, and all owners of land (excluding streets) included in the proposed change, or within an area determined by lines drawn parallel to and one hundred eighty-five (185) feet distant from the boundaries of the district proposed to be changed, shall be notified of such proposed change, in writing, by the City Clerk mailed to the address as shown on the tax books at least fifteen (15) days prior to such hearing.

In case of a protest against such amendment, supplement, change, modification, or repeal, duly signed and acknowledged by the owners of thirty percent (30%) or more, either of the land (exclusive of streets) included in such proposed change, or within an area determined by lines drawn parallel to and one hundred eighty-five (185) feet distant from the boundaries of the district proposed to be changed, such amendment shall not be passed except by the favorable vote of two-thirds (⅔) of the elected members of the Board of Aldermen.