In order to provide adequate protective screening for residential areas adjacent to or near nonresidential areas, the following regulations shall apply.
(A) Where an RM, HRM, RMH, R-O, C-1, C-2, C-3, C-4, M-1, M-2, or P-1 district abuts directly upon a residential district, those districts shall be screened from the contiguous, residentially zoned district by a screened fence, approved by the City Planning Commission or a person designated by the Commission.
(B) Where required fences are provided on the business side of public alleys, fence requirements may be waived to provide necessary entrance to or exit from required off-street parking and loading areas.
(C) Where a C-4 district abuts directly upon a residential district, that district shall be screened from the contiguous, residentially zoned district by a solid ornamental masonry wall 5 feet in height above grade no closer than 20 feet to the property line of commercial use in the C-4 district.
(D) Any nonconforming land or building use shall be required to comply with all the above requirements of this section.