Any parcel of land with an area or width less than that prescribed for a lot in the zone in which such lot is located, which parcel was under one ownership at the date of adoption of this Part 5, and the owner thereof owns no adjoining land, may be used as a lot for any purpose permitted in the zone, provided that all other regulations prescribed for the zone by this Part 5 are complied with and that the lot meets the standards and requirements of any other applicable ordinance of the Township or statute of the State of New Jersey, and further provided that no lot of less than 20,000 square feet in area or less than 100 feet of frontage shall be used.