Whenever the governing body of the municipality may deem it for the public interest, it may change or add to the official master plan by laying out new streets, improvements, or conveniences mentioned in this chapter or by widening, enlarging, closing, or abandoning existing streets, improvements, or conveniences. At least ten days’ notice of a public hearing on any proposed action with reference to such change in the official master plan shall be published in the official newspaper of the municipality. Before any such addition or change is made, the matter shall be referred to the planning commission for report thereon as provided in section 40-48-11. Such additions and changes, when adopted by an ordinance of the governing body, shall become a part of the official master plan of the municipality and shall be deemed to be final and conclusive with respect to all matters shown thereon. The layout, widening, enlarging, closing, or abandoning of streets, plazas, open spaces, and parks or playgrounds by the municipality under provisions of the laws of this state other than those contained in this chapter shall be deemed to be a change or addition to the official master plan and shall be subject to all the provisions of this chapter.