A separate and independent building sewer shall be provided for every building; except where one building stands at the rear of another on an interior lot, and no private sewer is available or can be constructed to the rear of the building through an adjoining alley, court, yard or driveway, the building sewer from the front building may be extended to the rear building and the whole considered as one building sewer. Other exceptions will be allowed only by special permission granted by the Superintendent of Public Works.
(Prior Code, § 6-804)