The purpose of this chapter is to promote the health, safety, morals and general welfare of the City by regulating and restricting the location and use of buildings, structures, and land for industry, business, trade, residence and other uses; regulating and restricting the heights, number of stories and size of buildings, the proportion of a lot that may be occupied, the size of yards, courts and other open spaces, and the density of population; requiring permits for land uses, building structures, and uses thereof; and requiring parking areas, all in accordance with the Comprehensive Plan of the City. Except as hereinafter provided, no structure shall be erected, converted, enlarged, reconstructed, remodeled or structurally altered, nor shall any structure or land be used except in accordance with the provisions of this chapter.