The purpose of this chapter is to allow an option for more flexible design than is permissible under the conventional zoning codes. The design should stress energy efficiency, architectural creativity, and innovation; use the natural features of the landscape to their greatest advantage; provide a quality of life equal to or greater than that provided in developments built under the standard zoning codes; be aesthetically pleasing; provide for more efficient land use; and reduce the impact of development on the natural environment and neighborhood.