Immediately after any assessment shall become payable, it shall be placed in the hands of the city attorney, who shall advertise notice once a week for three consecutive weeks in some newspaper published in the city, to the effect that if the assessment be not paid within the time stated in the notice, which time shall be fixed by the city council, suits will be commenced to enforce the collection thereof, and the attorney shall commence and prosecute suits against all persons delinquent. (Prior code § 21.04.027)