On all land annexed to the City of Shaker Heights after the effective date of this Zoning Ordinance, no construction or modification of land use shall occur until an ordinance designating the zoning classification of such land is duly adopted by the City of Shaker Heights. Within a reasonable time of annexation, the City Planning Commission shall file an application for an amendment to establish the zoning classification of such land. Action shall be taken on such application pursuant to Section 1213.07, Amendments. If no preannexation hearing is held and the Shaker Heights City Council does not approve a zoning amendment to classify such land as provided for in this Zoning Ordinance, such land will be classified as SF1 Single-Family Residential District, until such time as an amendment changing the zoning classification is adopted.