A. No walls, buildings, or other obstructions to view in excess of two (2) feet in height shall be placed on any corner lot within a triangular area formed by the street right-of-way lines and a line connecting them at points thirty-three (33) feet from the intersection of the street right-of-way lines.

B. Height of walls and fences in residential districts shall be measured from the lowest adjacent grade, except when adjacent to an alley or street right of way which has a higher grade than the adjacent site. Then the height shall be measured from the top of the crown of road or alley (if no curb). Height of screening devices shall be measured from the highest adjacent grade.