Each side lot line in any proposed subdivision shall be as close as is practicable to perpendicular to the center line of the street at the point at which the lot sideline terminates. Lot lines on cul-de-sacs shall maintain the minimum frontage requirements and will be reviewed on a case-by-case basis. All lots in the proposed subdivision shall conform to the minimum lot area and width requirements of the zone in which the proposed subdivision is located. Each lot to be used for residential purposes shall be served by a public street unless located on a private street that is within a planned unit development and/or has appropriate ingress and egress easements approved by the planning commission. (Ord. No. 1500, § 3 (part).)