When any street improvement or repair is ordered to be made by the city council under the provisions of this chapter, such order shall describe the kind of walk or improvement to be built or repaired and state the estimated cost thereof and declare what part of the expenses thereof, if any, shall be borne by the abutting property, or by property to be benefitted, and name the ratio or benefit the property affected will receive from such improvement. After the adoption of such order by the city council, the street commissioner shall forthwith notify the owner or the agent of such owner of the property affected by serving upon him a notice in the manner herein provided. (1983 Code § 12.02.050)