Alteration to a structure which encroaches upon one or more required yard or setback areas, where the alteration will comply with all current setback, yard, building coverage and building height requirements.
If the Building Commissioner determines that proposed alteration, extension or change exceeds one or more of the criteria set forth above, the Zoning Board of Appeals may, by special permit, allow such alteration, extension or change where it determines that the proposed modification will not be substantially more detrimental than the existing nonconforming structure to the neighborhood.