In the M-1 zone:
A. Required Walls: On those sides of property in the M-1 zone which abut a residential zone, school or park, a solid masonry wall not less than six feet (6') in height shall be built and maintained along the property lines adjoining such residential zone, school or park, except that the wall shall be three feet (3') in height where it adjoins the front yard setback area, such wall to be installed at the time the property is used for M-1 purposes.
B. Required Landscaping: A minimum of ten feet (10') of the front yard area adjacent to the street shall be landscaped when the front yard area adjoins a residential district, a major or secondary highway, or a freeway frontage road. Landscaping shall be provided and maintained in accordance with the standards established in sections 18.168.110 through 18.168.190 of this title. (Ord. 1000 § 28.20(E), 1955)