170.37   AMENDMENTS.  
The City Council may, from time to time, on its own initiative, on application, or on recommendation by the City Planning and Zoning Commission, after public notice and hearings provided by law, and after report by the City Planning and Zoning Commission or after thirty days written notice to said Commission, amend, supplement, or change the regulations or districts herein or subsequently established.
1.   Application. Whenever the owners of fifty percent or more of the area of the lots in any district or part thereof desire any amendment, supplement, or change in any of the provisions of this Chapter applicable to this area, they may file an application with the City Clerk requesting the City Council to make such amendment, supplement, or change.
2.   Application and Fee. Such application shall be accompanied by a map or diagram showing the area affected by the proposed amendment, supplement, or change, together with the boundaries of the said area and the names and addresses of all the owners of record in the office of the County Recorder of Carroll County, Iowa, of lots therein and within a distance of 200 feet outside of the boundaries in said area, said application should be accompanied by a fee of $100.00 payable to the general fund of Carroll, Iowa.
3.   City Planning and Zoning Commission. Said application shall immediately be transmitted to the City Planning and Zoning Commission for an investigation and report and said Commission shall file its recommendations approving, disapproving, or modifying the proposed amendment, supplement, or change with the City Council within 47 days thereafter.
4.   Protest. If a written protest against any proposed amendment, supplement, or change shall be presented to the City Council, signed by twenty percent or more of the owners, either of the area of the lots included in such proposed change or those immediately adjacent in the rear thereof, extending the depth of one lot or not to exceed 200 feet therefrom or of those directly opposite thereto, extending the depth of one lot or not to exceed 200 feet from the street frontage of such opposite lots, such amendments shall not become effective, except by the favorable vote of at least three-fourths of all the members of the City Council.
5.   Limitation. Whenever an application requesting an amendment, supplement, or change of any regulation prescribed by this Chapter has been denied by the City Council, such application cannot be reviewed for one year thereafter unless it be signed by at least fifty percent of the property owners who previously objected to the change; this provision, however, shall not prevent the City Council from acting on its initiative in any case or at any time as provided in this ordinance.
6.   Record. Administrative officer shall maintain a record of amendments to the text, the land use plans, and zoning maps in a form convenient for the use of the public and shall provide the City Clerk with a copy of each amendment to the text of this Ordinance and change to the land use plans and zoning maps and shall keep them as a part of the public record.