Three Unities Law and Legal Definition

The three unities refer to unities essential to establish a joint tenancy or a unitary business. They are: (1) unity of ownership; (2) unity of operation; and (3) unity of use.

The unitary nature of a business is definitely established by the presence of the three unities. In True v. Heitkamp, 470 N.W.2d 582 (N.D. 1991), the court held that the three unities test states that a unitary business is established by the presence of the following circumstances: (1) unity of ownership; (2) unity of operation as evidenced by central purchasing, advertising, accounting and management divisions; and (3) unity of use in its centralized executive force and general system of operation.