Following final approval by Council, the final plat map, as approved, may be legally recorded by forwarding the same with the required fee to the Clerk of the County Plat Board for additional approvals and recording in compliance with the Subdivision Control Act. Approval of the final plat by Council shall be null and void if the plat is not recorded within ninety days after the date of approval, unless application for an extension of time is made in writing during such ninety-day period to Council and granted.