In the I, B-3 and SW zones, no parking shall be permitted in any required front yard or within 10 feet of any rear or side lot line. When any parking area is visible from a public street adjacent to the lot containing such parking area, the parking area shall be screened from the street by a landscaped wood fence, landscaped decorative masonry wall or a solid evergreen hedge, each at least five feet but not more than six feet in height.