In any district in which single-family dwellings are permitted, a single family dwelling and customary accessory buildings may be erected on any single lot of record at the effective date of adoption or amendment of this Zoning Ordinance, notwithstanding limitations imposed by other provisions of this Zoning Ordinance. Such lot must be an isolated lot, and not of contiguous frontage with other lots that have not been built upon and that are in the same ownership. 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 requirements other than those applying to area or width, or both, of the lot shall conform to the regulations for the district in which such lot is located. Where the Zoning Inspector certifies to the Planning and Zoning Commission that these conditions have been met, he may proceed to issue the requisite certificates without referring the matter to the Board of Zoning Appeals.