Notwithstanding the provisions of Section 17.100.020 of this Zoning Code, initiation of amendments to the zoning map or modification of the provisions of this Zoning Code shall be as follows:
(a) By Resolution of intention of the City Council; or
(b) By Resolution of intention of the Planning Commission; or
(c) By application by one or more property owners of property proposed for rezoning. Such application shall be filed as required by Section 17.100.020. Furthermore, the application shall explain the reason of public necessity, convenience, health, safety, or general welfare requiring such amendment.