A.    Whenever any street, alley, public way, railroad right-of-way, waterway or other similar area is vacated by proper authority, the districts adjoining each side of such street, alley, public way, railroad right-of-way or similar area, shall be extended automatically to the center of such vacation and all area included in the vacation shall then and thenceforth be subject to all appropriate regulations of the extended districts. In the event of a partial vacation, the adjoining district, or district nearest the portion vacated, shall be extended automatically to include all the vacated area.

    B.    Whenever an area is annexed to the city, the area shall be zoned in accordance with the requirements of law. (Prior code § 40-3-3)