All nonconforming uses and structures legally existing at the time of the adoption of this chapter and all uses and structures which become nonconforming by reason of amendment thereof may be continued.

Any nonconforming use or structure legally existing at the time of the passage of this chapter may be continued upon the lot or in the building so occupied, and any such structure may be restored or repaired in the event of partial destruction thereof.

Nothing in this section shall be deemed to prevent keeping in good repair a building in which a nonconforming use is conducted.

If any nonconforming use is changed to or replaced by a conforming use or is moved for any distance for any reason, the land building theretofore devoted to such nonconforming use shall thereupon be subject to all the regulations as to use for the district in which such land and building are located, as if such nonconforming use had never existed.

The foregoing provisions shall apply to all nonconforming uses existing at the time of the adoption of this chapter and to all uses that become nonconforming by reason of any amendment thereof.