Any nonconforming uses or structures existing as of the date of adoption of this chapter may be continued upon the lot or in the building so occupied, and any structure may be restored or repaired in the event of partial destruction thereof.

No nonconforming building may be enlarged or expanded to cover a larger area than it occupied at the date of adoption of this chapter. No nonconforming use may be extended or expanded over a larger area than it occupies at the time of enactment of this chapter.

After a nonconforming building or use has been converted to a permitted use, it shall not be changed back again to a non-conforming use.

If a nonconforming use has been abandoned, such use shall not be recommenced. Cessation of a nonconforming use for a continuous period of one year may be taken as prima facie evidence of an intent to abandon such use.