N.D. Cent. Code § 41-02.1-13: (2A-204) Formation in general

1.A lease contract may be made in any manner sufficient to show agreement, including conduct by both parties which recognizes the existence of a lease contract.

2.An agreement sufficient to constitute a lease contract may be found although the moment of its making is undetermined.

3.Although one or more terms are left open, a lease contract does not fail for indefiniteness if the parties have intended to make a lease contract and there is a reasonably certain basis for giving an appropriate remedy.