Except as otherwise provided in this article, the lawful use of land or building existing at the date of the adoption or amendment of this chapter may be continued, although such use or building does not conform to the regulations specified by this chapter for the zone in which such land or building is located. A nonconforming activity, use, structure or lot may not:
B. Be changed to another use, activity, structure or lot size that is nonconforming.
C. Revert to nonconformity after having once been made conforming.
D. Be reinstated if the activity or use is discontinued for a period of twelve consecutive months, regardless of the intent to abandon.
E. Be restored in case of destruction, provided that this restriction shall not be construed to prohibit restoration or repair of a nonconforming structure in the event of partial destruction.