If two (2) or more lots or combinations or portions of lots with continuous frontage are in single ownership regardless of separate deeds of record, and if all or part of the lots do not meet the requirements for lot width and area as established by this chapter, the land involved shall be considered to be an undivided parcel for the purposes of this chapter, and no portion of the parcel shall be used which does not meet lot width and area requirements established by this chapter, nor shall there be any division of the parcel.