This title classifies and regulates the use of land, buildings, and structures within the city limits, as hereinafter set forth. The regulations contained herein are necessary to promote the health, safety, convenience and welfare of the inhabitants by dividing the city into zones and regulating therein the use of the land and the use and size of buildings as to height and number of stories, the coverage of the land by buildings, the size of yards and open spaces, the location of buildings and the density of population. (1991 Code § 25-4)