(A) Nonconforming vacant lots in residential district. In any district where dwellings are permitted, a one-family detached dwelling may be erected on any lot of official record as of the effective date of this zoning code when by reason of its lot area, width, or depth it does not meet minimum requirements for a lot under these regulations. However, no lot shall be deemed to be less than 40 feet wide for the calculation of yard requirements, and provided, further, that:
(1) The sum of the side yard widths on any such lot of record shall be at least 25% of the width of the lot;
(2) In no case shall the width of any side yard be less than 10% of the width of the lot, except that on a corner lot the width of side yard adjoining the side street lot line shall be not less than ten feet;
(3) The depth of the rear yard of any such lot need not exceed 20% of the depth of the lot, but in no case shall it be less than 20 feet; and
(4) If the width of such lot meets the standards of this zoning code but the depth is such that the total area is less than 7,500 square feet, the rear yard for such lot shall have a minimum of 30% of the depth of the lot but in no case shall it be less than 30 feet.
(B) Nonconforming vacant lots in other districts. In any district, other than a residential district, a building designed for any permitted use in the district may be erected on any lot of official record as of the effective date of this zoning district provided that the building shall comply with all regulations applicable in the district in which the lot in question is located. However, the width of any required side yard need not be greater than that derived by applying the following equation, where X equals the required side yard width:
X = minimum side yard required by district regulation
actual lot width minimum lot width required by district regulation
actual lot width minimum lot width required by district regulation
('80 Code, § 152.166) (Ord. 94-14, passed 7-5-94)