Council shall, within reasonable time after the public hearing, approve or deny the proposed zoning amendment. For a proposed amendment involving a change in the Zoning Map, Council may modify the original proposal to a more restricted zoning district or a smaller area than advertised for the public hearing, but may not approve a change to a zoning district allowing uses not permitted in the proposed district originally listed in the notice for public hearing, and also may not approve rezoning of any land not listed in the notice for public hearing. No such ordinance, measure or regulation which violates, differs from or departs from the plan or report submitted by the Planning Commission shall take effect unless passed or approved by not less than five members of Council.