When the Planning and Zoning Commission makes a recommendation to Council for change in, or addition to, any zoning ordinance, Council shall study each such recommendation; and action shall be taken by Council within ninety (90) days after receiving said recommendation, in accordance with Section 9.05 of the Charter, unless the Council votes, at its next regular meeting following expiration of the ninety (90) day period, for an additional sixty (60) days extension beyond the ninety (90) day period. If the period is so extended, Council shall take action on such recommendation prior to the expiration of such extension of sixty (60) days.