N.D. Cent. Code § 48-04-01

Any civil township and incorporated city located within the boundaries thereof, when authorized by three-fourths of the legal voters of each municipality present and voting at separate elections, may acquire and use jointly any public buildings and grounds within the corporate limits of either one. The question of such joint acquisition and use may be submitted at regular or legally called special elections of both municipalities held not more than three months apart and when once submitted may not again be submitted within one year.