(A) The purpose of this title is:
(1) To encourage, classify, designate, regulate, restrict and segregate the highest and best location and use of buildings, structures and land;
(2) To regulate and limit the bulk and dimensions of buildings and other structures hereafter designed, erected or altered;
(3) To regulate and determine building setbacks and open spaces; and
(4) To regulate and limit the density of population, and for said purpose to divide the city into zones of such number, shape and area as may be deemed best suited to carry out these regulations and provide for their enforcement.
(B) Regulations are deemed necessary in order:
(1) To encourage the most appropriate use of land;
(2) To conserve and stabilize the value of property;
(3) To provide adequate access to light and air and to prevent and control fires;
(4) To prevent undue concentration of population;
(5) To lessen congestion of public rights-of-way;
(6) To facilitate adequate provision for community utilities such as transportation, water, sewage, schools, parks and other public requirements; and
(7) To promote the public health, safety and general welfare so as to implement the city's General Plan.
(`83 Code, § 17.04.020)