One single-family detached dwelling may be erected and used on any lot located in any industrial district which is unimproved and held in single and separate ownership at the effective date of this chapter, if permitted by, and subject to, the zoning regulations applicable to such lot immediately prior to the effective date of this chapter, and such lot shall be used only for such dwelling purpose and accessory uses customarily incidental thereto.
(1995 Code, § 153.151) (Ord. 68-15, passed 8-22-1968)