(a) A building may be erected or altered on any lot held in single and separate ownership on the effective date of the ordinance from which this chapter derives which is not of the required minimum area or width or is of such unusual dimensions that the owners would have difficulty in providing the required open spaces for the Zoning District in which the lot is situated, provided however, notwithstanding anything in the above to the contrary, no building shall be constructed on a lot less than six thousand (6,000) square feet in area or less than fifty (50) feet in width.

(b) Where at least two (2) and not more than five (5) contiguous undeveloped lots are held in single ownership within a subdivision which has been duly recorded prior to the effective date of the ordinance from which this chapter derives, which lots are individually not of the required minimum area or width for the zoning district in which they are situated, no variance shall be required for the issuance of building permits, provided that such lots shall be developed in groups or fractions thereof, as single lots, to provide the minimum lot area required for each structure. Such groups or fractions of lots developed as single lots shall be re-subdivided as provided in the subdivision control ordinance.