For the purpose of regulating and restricting the erection, construction, reconstruction, alteration, repair, or use of buildings or land, and regulating and restricting the location of trades and industries and the location and design of buildings for specific purposes, and to regulate and limit the height and bulk of buildings, and the area of yards and other open spaces, and to regulate and limit the density of population, the city is hereby divided into districts as follows:

(Code 1964, § 19.120; Ord. No. 9958, § 1, 10-3-83; Ord. No. 10847, § 1, 1-6-86); Ord. No. 11702, § 1, 12-7-87; Ord. No. 14334, § 1, 1-3-95)