Property that is adjacent to a residential or commercial district shall be provided along such property lines with a wall, fence, compact evergreen hedge or a landscaped strip of trees and shrubs so designed as to form a visual screen not less than six feet high at the time of planting. Except for landscaped areas and parking areas, a use which is not conducted within a completely enclosed building shall be screened by a six-foot solid masonry wall, chain-link fence covered with an evergreen vine or compact evergreen hedge. Where a front yard adjoins a street, the wall, fence or hedge shall be located no closer to the street than the depth of the required yard.