The City Council is authorized to render a final determination on a zoning amendment application; provided, however, that a change in the regulations of this title, or a change in zoning boundaries or designation of a property or properties all or in part within the Coastal Zone, shall be subject to the provisions of subsection D of this section. The City Council's determination shall be made upon receipt of advisory recommendations from the Planning Commission. The Council's authority to render a determination on a zoning amendment application includes the authority to approve, approve in a modified form, or deny such application.