(A)   The City Council may from time to time amend, supplement or change by ordinance the boundaries of the districts or the regulations herein established.
   (B)   Before taking any action on any proposed amendment, supplement or change, the City Council shall submit the same to the city’s Planning Commission for its recommendation and report.
   (C)   A public hearing shall be held by the City Council before adopting any proposed supplement, amendment or change. Notice of such hearing shall be given by publication three times in the official publication of the city, stating the time and place of such hearing which time shall not be earlier than 15 days from the first day of such publication.
   (D)   Unless such proposed amendment, supplement or change has been approved by the city’s Planning Commission or if a protest against such amendment, supplement or change has been filed with the Building Inspector duly signed and acknowledged by the owners of 20% or more either of the area of the lots included in such proposed change or those immediately adjacent in the rear thereof extending 200 feet therefrom of those directly opposite thereto extending 200 feet from the street frontage of such opposite lots, such amendment, supplement or change shall not become effective, except by a three-fourths vote of the City Council.
(2012 Code, § 93-14)