§ 273. Official map, changes. Such town board is authorized and empowered, whenever and as often as it may deem it for the public interest, to change or add to the official map of the town so as to lay out new streets, highways, drainage systems or parks, or to widen or close existing streets, highways, drainage systems or parks within that part of the town outside the limits of any incorporated city or village. At least ten days' notice of a public hearing on any proposed action with reference to any such change in the official map shall be published in a newspaper of general circulation in such town. Before making any such addition or change, the town board shall refer the matter to the planning board for report thereon, but if the planning board shall not make its report within thirty days of such reference, it shall forfeit the right further to suspend action. Such additions and changes, when adopted, shall become a part of the official map of the town, and shall be deemed to be final and conclusive with respect to the location of the streets, highways, drainage systems and parks shown thereon. The layout, widening or closing, or the approval of the layout, widening or closing, of streets, highways, drainage systems or parks, by the town board, or the town superintendent of highways, under provisions of law other than those contained in this article, shall be deemed to be an addition or change of the official map, and shall be subject to all the provisions of this article with regard to such additions or changes.