A. Encourage imaginative design and the creation of permanent open space by permitting greater flexibility in zoning requirements than is generally permitted by other chapters of this title;

B. Preserve or create environmental amenities superior to those generally found in conventional developments;

C. Create or preserve usable open space for the enjoyment of the occupants;

D. Preserve to the greatest possible extent the natural characteristics of the land, including topography, natural vegetation, waterways, views, etc.;

E. Encourage development of a variety of housing types;

F. Provide for maximum efficiency in the layout of streets, utility networks, and other public improvements;

G. Provide a guide for developers and city officials in meeting the purpose and provisions of this chapter. (Ord. 583 §2.16(A), 1980).