Amendments to this Ordinance may involve an amendment of the text of this Ordinance or the Official Zoning Map, and may be initiated in one of the following ways:
(a) By the introduction of an ordinance by a member of City Council.
(b) By the filing of a petition signed by property owners of fifty percent (50%) or more of all the property within the boundary of two hundred feet (200') of the boundaries proposed to be changed. Council shall act upon such petition within ninety days (90) after the filing thereof.