All existing and named streets, avenues, places, boulevards, drives or ways shall continue to bear the designation heretofore existing under the King County numbering system unless changed by resolution or ordinance of the city council after the council has determined that the prior designation does not conform to the official street designating ordinance, that the public convenience and welfare will be served by such change in designation, or that the change in designation will implement the goals and policies of the city. (Ord. 5098 § 1, 1998; 1961 code § 10.08.070.)