When the grade of any street or sidewalk in any city or town is established by the corporate authority of such city or town and a building shall thereafter be constructed upon a lot abutting on said street, no change must be made in the grade of such street or sidewalk which requires the raising or lowering of any building so constructed until the damages which may accrue by reason of such raising or lowering are ascertained and paid as is hereinafter provided.
§ 7-14-4202, MCA