Hereafter all sidewalks shall be of single- course construction and shall be constructed and laid in accordance with standard plans and specifications hereby adopted by reference and filed in the office of the city clerk as provided by K.S.A. 12-1802. It shall be unlawful for any person, firm or corporation to construct, reconstruct or repair any sidewalk except as provided by this article. (Ord. 111, Sec. 4; Code 2000)