A planned unit development is a mechanism by which the city may permit a variety in type, design, and arrangement of structures; and enable the coordination of project characteristics with features of a particular site in a manner consistent with the public health, safety and welfare. A planned unit development allows for innovations and special features in site development, including the location of structures, conservation of natural land features, conservation of energy and efficient utilization of open space. Large scale developments as defined herein shall be submitted as planned unit developments. (Ord. 566, 5-15-2007)