As required by M.S. § 462.357 and M.S. § 462.3595 a public hearing shall be held by the City Council or the Planning Commission, if a Planning Commission exists in the city, before any conditional use permit, variance, or zoning amendment may be granted. A notice of the time, place and purpose of the hearing shall be published in the official newspaper of the city at least ten days prior to the day of the hearing. In the case of an amendment to the zoning code which involves changes in district boundaries affecting an area of five acres or less, and in the case of an application for a conditional use permit or a variance, a similar notice shall be mailed at least ten days before the day of the hearing to each owner of affected property and property situated wholly or partly within 350 feet of the property to which the zoning code amendment, conditional use or variance relates. The applicant shall provide a list of the owners of affected property and property situated wholly or partly within 350 feet of the property to which the hearing relates. The Clerk or other person appointed by the City Council to administer this chapter may use any appropriate records to determine the names and addresses of owners. A copy of the notice and a list of the owners and addresses to which the notice was sent shall be attested to by the Clerk or other person appointed by the City Council to administer this chapter and shall be made a part of the records of the proceedings. The failure to give mailed notice to individual property owners, or defects in the notice shall not invalidate the proceedings, provided a bona fide attempt to comply with the mailed notice requirements has been made.