Whenever the use of a building, structure or land becomes non-conforming through an amendment to the Zoning Code or Zoning District Map, such use may be continued. Where a lot of record at the time of the effective date of this Chapter (July 12, 1999) has less area or width than herein required in the district in which it is located, and the owner of the lot does not own any other parcel or tract adjacent thereto, said lot may be used for a single-family dwelling or for any non-dwelling use permitted in the district in which it is located.