(a) Except as provided in Paragraph (b), no sign may be attached to the following structures located on a building:
(1) Elevator penthouse or bulkhead.
(2) Mechanical equipment room.
(3) Cooling tower.
(4) Tank designed to hold liquid.
(5) Ornamental cupola or dome.
(6) Skylight.
(7) Clerestory.
(8) Visual screens which surround roof mounted mechanical equipment.
(9) Chimney and vent stacks.
(10) Amateur communications tower.
(11) Parapet wall over four feet.
(12) Storage facility.
(b) A sign may be attached to a structure located on a building if the sign refers exclusively to:
(1) the identification of the premise; or
(2) a tenant that occupies in excess of 50 percent of the floor area of the premise. (Ord. 20343)