The Zoning Ordinance shall consist of the officially adopted Zoning Map or Maps of the City designating certain Zones and the regulations set forth in this chapter controlling the uses of land, the density of population, the uses and locations of structures, the height and bulk of structures, the open spaces about structures, the external appearance of certain uses and structures, the areas and dimensions of sites, and requiring the provisions of off-street parking, off-street loading facilities and landscaping.