The provisions of this title are hereby adopted to promote the health, safety, morals and general welfare; to regulate and restrict the height, number of stories and size of buildings and other structures, the percentage of lot which may be occupied, the size of yards, courts and other open spaces, the density of population, the location and use of buildings, structures and land for trade, industry, residence and other purposes; and for the said purposes to divide the city of Menomonie into districts of such number, shape and area as are deemed best suited to carry out the said purposes; to provide a method for its administration and enforcement and to provide penalties for its violation. (1975 Code Ch. 18)