If topographical vegetation, screening, or other barriers along the perimeter of a PRD project, which exceeds five (5) acres of total land area, do not achieve reasonable compatibility with adjacent existing uses in terms of building massing and spacing, the City may impose the following requirements:
A. A PRD located adjacent to an existing housing development may be required to locate housing of the same type adjacent to that development.
B. Structures located on the perimeter of the PRD project may be set back two (2) feet for each one (1) foot in height above twenty (20) feet. This additional setback, if imposed, shall be in excess of the basic setback requirement.