(a) Existing dwellings and accessory buildings in a manufacturing district may be expanded or improved by a conditional use permit, providing the dwellings and accessory buildings, when expanded or improved, are of the type permitted and as regulated in the least restrictive contiguous district, and otherwise comply with the terms and provisions of this Zoning Code.
(b) New dwellings and accessory buildings may be constructed on a vacant lot in a manufacturing district by a conditional use permit, providing the dwelling and accessory buildings are of the type permitted and as regulated in a Residential One-Family-40 District, including area and yard requirements, otherwise comply with the terms and provisions of this Zoning Code, and provided further that the lot for which a conditional use permit is sought is not further than one zoning lot away from a lot being devoted to residential use, or more than 50% of the lots on the same side of the street for a distance of 200 feet from it in either direction are devoted to residential use.
(c) In addition to other standards set forth in the Code, it must be also determined that the proposed expansion or improvement to an existing dwelling or accessory building, or the construction of a new dwelling or accessory building, will not unduly interfere with the assembly of land for industrial development.
(1980 Code 151.74)