The Legislative Body shall not act upon a proposed amendment to this Ordinance until it shall have received a written report and recommendation from the Planning Commission on the proposed amendment and the Legislative Body, after public hearing, may grant or deny any application for an amendment, provided however, that 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 three-fourths (3/4) of the membership of the Legislative Body.