(1) Chestnut Street. No new building shall be erected and no existing building shall be rebuilt or its front altered or its height increased, on Chestnut Street between the Delaware River and the Schuylkill River, without making it conform to the lines on the City Plan.

(2) Walnut Street. No new building shall be erected and no existing building shall be rebuilt or its front altered or its height increased, on Walnut Street from Sixth to Twenty-second Street, without making it conform to the lines on the City Plan.