(a) Whenever any part of a building, structure or land occupied by a non-conforming use is changed to or replaced by a use conforming to the provisions of this Zoning Code, such premises shall not thereafter be used or occupied by a non-conforming use, even though the building may have been originally designed and constructed for the prior non-conforming use.
(b) Whenever a non-conforming use of a building or structure or part thereof, has been discontinued for a period of twelve consecutive months, or whenever there is evident a clear intent on the part of the owner to abandon a non-conforming use, such use shall not, after being discontinued or abandoned, be re-established, and the use of the premises thereafter shall be in conformity with the regulations of the district.
(c) Where no enclosed building is involved, discontinuance of a non-conforming use for a period of six months shall constitute abandonment, and shall not thereafter be used in a non-conforming manner.
(d) A non-conforming use not authorized by the provisions of this Zoning Code, in effect at the time an amendatory ordinance becomes effective, shall be discontinued and not re-established, except when the provisions of the amendatory ordinance find the use to be conforming to the district in which it is then located.
(1977 Code § 73-302)