Amendments to the Development Code or Map may be initiated in one of the following ways:
(a) By adoption of a motion by the Planning Commission.
(b) By introduction of an ordinance in Council.
(c) By the filing of an application by the owner of the property or lessees of property or developers with an option or a signed purchase contract on such property within the area proposed to be changed or affected by said amendment. If the applicant is not the property owner, the property owner shall sign the application.