All concrete sidewalks which have been laid before the effective date of the ordinance codified in this chapter, with or without the order of the city council, but with its permission, which are found by the council to be in perfect condition, of full depth, well seasoned and unimpaired or broken, and which conform generally with these specifications, may, by order entered upon the minutes of the council, remain and be excepted from any work ordered by the council after the effective date of the ordinance codified in this chapter, provided that they are on the official grade. (Ord. 12-03, 2012)