Notice of hearing. A Class 2 notice in accordance with Ch. 985, Wis. Stats., shall be published in the City's official newspaper once during each of the two weeks prior to such hearing. At least 10 days before the public hearing, a written notice of such hearing shall also be given to the clerk of any municipality whose boundaries are within 1,000 feet of any lands included in the proposed amendment. Written notification to all adjacent property owners must be given. Failure to give such notice shall not invalidate such amendment.