Buffering. Along each property line which directly abuts any residential district or any use permitted in those districts, a buffer area of not less than 100 feet in width, of which not less than 25 feet shall be landscaped, shall be provided. Along any property line which abuts any other use along any street line, a buffer area of not less than 25 feet in width, of which not less than 15 feet shall be landscaped, shall be provided. All landscaping shall be designed, installed and maintained in accordance with Article XXI.