For the purposes of this Section, a private road shall be considered to be a street, and a line seven feet from and parallel to the required curb of the private road shall be considered to be a street line, and the applicable yard regulations of Section 23-30 (YARDS, COURTS AND OTHER OPEN AREA REGULATIONS), inclusive, shall be applied accordingly. However, no yard shall be required along that side of a private road, or portion thereof, that does not have a building wall facing it.