Township zoning regulations in effect for territory annexed to or consolidated with the City subsequent to the effective date of the enactment of this section shall, upon the effective date of such annexation or consolidation, remain in force and effect for a period of time not to exceed nine months and shall be administered by the Division of Building and Zoning of the City. The Municipal Planning Commission shall recommend to Council within a period of time not to exceed six months from such effective date of annexation or consolidation, a zoning districting plan of such property in accordance with the provisions of this Zoning Code.