Whenever the use of any part of any building, other structure or land occupied is changed to or replaced by a use conforming to the provisions of this title, such premises shall not thereafter be used or occupied by a nonconforming use. Whenever a nonconforming use of such building, other structure or land, or part thereof, has been discontinued for a period of twelve (12) consecutive months, or whenever there is evident a clear intent on the part of the owner to abandon a nonconforming use, such use shall not, after being discontinued or abandoned, be reestablished, and the use of the premises thereafter shall be in conformity with the regulations of this zoning title. Where no building is involved, discontinuance of a nonconforming use for a period of six (6) months shall constitute abandonment. (1983 Code)