In case the owner of abutting property is a corporation and has no agent or officer residing with the city, then service shall be made upon such corporation in the same manner as provided by the laws of the state for the service of summons upon a corporation in a civil action, commenced in the district courts of the state. If the owner is a nonresident of the city, then the city clerk may serve the notice by registered mail, if he can ascertain the place of residence of such nonresident owner, and in the event he cannot be so served, then service can be made by advertising twice in a weekly newspaper published in the city.
No irregularity in the method of service shall in any manner affect any assessment made under the provisions of this article, if the provisions of this section have been substantially complied with, and shall not affect such assessment whatsoever, if the owner of such property has actual notice of the resolution or action of the council for the same length of time fixed in the notice herein required to be served upon him.
Service in a newspaper shall be deemed completed at twelve o'clock (12:00) noon following the day of the last publication. (1960 Compilation § 14-203)