No change in a zoning regulation, restriction, or boundary may become effective until after a public hearing at which parties in interest and citizens shall have an opportunity to be heard. Notice of the hearing must be published in the official newspaper once a week for two successive weeks prior to the time set for the hearing. The notice must contain the following items: (1) the time and place of the hearing, (2) a description of any property involved in any zoning change, by street address if streets have been platted or designated in the area affected, (3) a description of the nature, scope, and purpose of the proposed regulation, restriction, or boundary, and (4) a statement of the times at which the proposal will be available to the public for inspection and copying at the office of the city auditor. (NDCC 40-47-04 and 40-47-05)