(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 chapter, such premises shall not thereafter be used or occupied by any non-conforming use.
(B) Whenever a non-conforming use of a building or structure or a part thereof has been discontinued for a period of 18 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 reestablished, and the use of the premises thereafter shall be in conformity with the regulations of the district.