Protective screening areas are established as shown on the recorded Plats and are noted as "non-access easements." Except as otherwise provided herein regarding street intersections under "Sight Distance at Intersection", planting shall be retained and maintained throughout the entire length of such areas by the owner or owners of the lots at their own expense to form an effective screen for the protection of the residential area. No screen planting over seventy-two (72) inches high shall be permitted between the building setback line and front lot line on lots or areas deemed necessary.