N.D. Cent. Code § 47-16-26: Double letting of room prohibited

One who rents part of a room for a dwelling is entitled to the whole of the room, notwithstanding any agreement to the contrary. If a landlord rents a room as a dwelling for more than one family, the person to whom the landlord first rents any part of it is entitled to the possession of the whole room for the term agreed upon. Every tenant in the building under the same landlord is relieved from all obligation to pay rent to the landlord while such double letting of any room continues.