1.   Amendments. In accordance with the provisions of Chapter 414, Code of Iowa, the Council may from time to time (following public hearing before the Council, pursuant to statutory published notice) amend or change by ordinance the number, shape, or area of districts established on the zoning map or the regulations set forth in this chapter; but no such amendment or change shall become effective unless the ordinance proposing such amendment or change shall first be submitted to the Commission for approval, disapproval or suggestions, and the Commission shall have been allowed a reasonable time, not less than 30 days, for consideration and report.

   2.   Hearing. Before submitting its recommendations and report to the Council, the Commission shall hold a public hearing on the proposed amendment, supplement or change. It shall give not less than four or more than 20 days’ notice of the time and place of such hearing by publication in a newspaper published in the community and by mailing notices to all property owners directly involved, contiguous to or directly across a street or alley from the area proposed to be altered.

   3.   Application for Change. Any person desiring a change in zoning of property may make application therefor, and in so doing shall accompany the petition for such change with a fee in the amount of $150.00 toward the cost of processing the application.

   4.   Notice. During the 20 days prior to the public hearing, the text or copy of the text of such ordinance or petition, together with the maps or plans or copies thereof shall be on file, for public examination, in the office of the Commission and in the City Hall. No ordinance which differs from the recommendation made by the Commission shall become effective unless passed by not less than three-fourths of all members of the Council.

   5.   Written Protest. If a written protest against a proposed change in the boundaries of a district signed and acknowledged by the owners of 20 percent or more of the property within 200 feet of the property proposed to be altered is filed with the Clerk at or before the public hearing, such amendment shall not be passed or become effective except by the favorable vote of three-fourths of all members of the Council.

   6.   Notifications. The failure to notify, as provided by this section, shall not invalidate an ordinance, provided such failure was not intentional, and the omission of the name of any owner or occupant of property who may, in the opinion of the Commission, be affected by such amendment, supplement or change, unless such omission is intentional, shall not invalidate any ordinance passed hereunder, it being the intention of this section to provide so far as may be for notice to the persons substantially interested in the proposed change that an ordinance is pending before the Council, proposing to make a change in zoning.