Discontinuance. A nonconforming use of a building or structure, or a portion thereof, which is discontinued for a period of 12 consecutive months shall not be reestablished, and any subsequent use shall conform to the use regulations of the district in which the premises are located. A use shall be deemed to have been discontinued under any of the following conditions:
(1)
Vacancy of a nonconforming use building or discontinuance of a nonconforming use for a period of 12 consecutive months.
(2)
Manifestation of a clear intent on the part of the owner to abandon the nonconforming use.