No plant, rock, sign, fence, wall, structure or object in excess of three feet (3') in height shall be placed on any corner lot within a triangular area formed by the street property lines and the line connecting them at points thirty feet (30') from the intersection of the street lines. Mature trees which are located in the clear vision zone shall be pruned to a height of at least seven feet (7') above the established sidewalk or street elevation. (Ord. 2007-02, 1-16-2007)