This district maintains an aesthetic viewshed for motorists and landowners along the length of the Garden Parkway. Any (GP) Overlay district initially established shall contain a minimum depth of at least 1,000 linear feet and shall consist of all lots fronting along the Garden Parkway for a depth of 500 feet on each side of the Garden Parkway as measured from the centerline of the Garden Parkway. The Board of Commissioners shall have the authority to modify the initial or subsequent placement of the (GP) Overlay district boundaries on a case-by-case basis.