In any zoning district, notwithstanding limitations imposed by other provisions of this ordinance, where an existing lot of record fails to meet the requirements of this ordinance for minimum lot area, minimum lot width or both, of the zoning district in which it is located, the lot may be used for the permitted uses of the zoning district, including permitted accessory uses, provided other requirements of the zoning district in which the lot is located are met. The lot must be an existing lot of record, created prior to the effective date of the original zoning ordinance or the amendment that made the lot nonconforming.