No building or part thereof, or structure shall be erected, nor shall any existing building be altered, enlarged, or rebuilt or moved into any zone, nor shall any open space be encroached upon or reduced in any manner, except in conformity to the yard and setback regulations designed for the zone in which such building or open space is located, except as specified in Chapter 17.54 of this code.
(Ord. 1397.16.2 §§ 1 (part), 2 (part), 1994)