Where uncertainty exists as to the boundaries of any zone shown on the zoning map, the following shall apply:
(A) A street, alley, railroad right-of-way, watercourse channel or other right-of-way included on the official zoning map, unless otherwise indicated, shall be included within the zone of adjoining property.
(B) Where such street, alley, railroad right-of-way, watercourse or other right-of-way serves as a boundary between two or more different zones, the center-line of said right-of-way shall be considered the zone boundary.
(C) Where uncertainty exists, the Commission shall, by written decision, determine the location of the zone boundary.
(D) In the event that a vacated street, alley, or other right-of-way was the boundary between two or more zones prior to its being vacated, the new zone boundary shall be at the new property line. Where said vacation does not involve the establishment of a new property line, said zone boundary shall be fixed by written decision of the Commission.
('64 Code, § 23.01)