A. Measure the height of the building at the center point of each exterior wall from existing grade to the point directly above it at the point where the vertical projection of the wall meets the roof surface.

B. Multiply the height at the center of each wall by the length of the wall.

C. Add the results of the above multiplications together, and divide by the total length of the perimeter of the walls of the building. (Ord. 2015-3 Exhibit D, 2015; Ord. 89-1 § 1, 1989.)