Whenever the grade of any sidewalk has been established, it shall be the duty of the owner of any land binding thereon to lay a sidewalk not more than fifteen (15) nor less than four (4) feet wide, in the discretion of the board of aldermen, to be constructed of concrete, brick or some other approved material equally as good, along any such property, to conform to the grade established by the city, within twenty (20) days after receiving notice in writing from the city engineer to do so. Violation of this section is declared to be a municipal infraction. The penalty for violation shall be the sum of twenty-five dollars ($25.00). (Code 1953, § 18.24; Ord. No. G-80-36, § 1, 8-21-80)