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

Nonconforming buildings or structures, which comply with the use requirements of this chapter and are nonconforming because of height, area or yard regulations may be enlarged provided that any enlargement meets all the requirements of this chapter.