In any district where dwellings are permitted, a one-family detached dwelling may be erected on any lot of official record on the effective date of this Ordinance, even though such lot does not comply with the lot area and width requirements of the district in which it is located, provided said lot has a minimum of twenty-five (25) feet frontage on a public right-of-way; and further provided the following conditions are complied with:
(a) If the owner of such lot does not own adjacent property and did not own such property at the time this Ordinance became effective, two (2) inches may be deducted from the required minimum width of each side yard and four (4) inches from the required sum of minimum widths of both side yards for each foot that the lot is narrower than the required width for the district. In no case, however, shall any side yard be narrower than three (3) feet.
(b) If the owner of such lot owns two (2) or more adjacent lots, or other adjacent property, such owner shall redivide the property in such a manner that they conform to the minimum width of such lots in the most proximate single-family district. However, if such redivision would result in lots that exceed width requirement of lots in the most proximate district, such redivision shall provide for one (1) more building lot than would otherwise be allowed.