(a) In any district in which one-family dwellings are permitted, notwithstanding limitations imposed by other provisions of this Zoning Ordinance, a one-family dwelling and customary accessory buildings may be erected on any single lot of record on the effective date of the adoption or amendment of this Zoning Ordinance. This provision shall apply even though such lot fails to meet the requirements for area or width, or both, that are generally applicable in the district, provided that yard dimensions and other requirements not involving the area or width, or both, of the lot, conform to the regulations for the district in which such lot is located.
(b) If two (2) or more lots, or combinations of lots and portions of lots, with continuous frontage in single ownership, are of record at the time of passage or amendment of this Zoning Ordinance, and if all or part of the lots does not meet the requirements for lot width and area as established by this Zoning Ordinance, the lands involved shall be considered to be an undividable parcel for the purposes of this Zoning Ordinance, and no portion of such parcel shall be used or sold which does not meet the lot width and area requirements established by this Zoning Ordinance. No division of the parcel shall be made which leaves remaining any lot with a width or area below the requirements of this Zoning Ordinance.