Mich. Comp. Laws § 440.2854: Lease contract; sufficiency to show agreement; conduct; open terms.

Sec. 2A204.

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.

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

Although 1 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.