Any nonconforming use, building, or structure which existed lawfully at the date of the adoption of this chapter and which remains nonconforming, and any use, building, or structure which shall become nonconforming upon the date of the adoption of this chapter or any subsequent amendment hereto, may be continued, or converted to a conforming use, provided that:
(A) No structural alterations shall be made to a nonconforming building or structure, except as may be required by law, or to make the building, or structure, and use thereof conform to the regulations of the district in which located;
(B) No nonconforming building or structure shall be moved in whole or in part to any new location, unless made to conform to all regulations of the district to which moved;
(C) A nonconforming building or structure which is destroyed or damaged by fire or other casualty or act of God to the extent that the cost of restoration of the destroyed or damaged portion shall exceed 50% of the cost of the restoration of the entire building new, shall not be restored unless made to conform to all regulations of the district in which located;
(D) Any nonconforming building or structure which is or hereafter becomes vacant and remains unoccupied or is not used for a continuous period of one year shall not thereafter be occupied or used except by a use which is conforming;
(E) Any nonconforming use which is discontinued for a period of one year shall not be renewed;
(F) No nonconforming building, structure, or use shall be enlarged, expanded, or extended, nor shall any such building, structure, or use be changed to another nonconforming use.