The board of county commissioners of any such county and the city council of such city desiring to avail itself of the provisions of this act shall at any time, set up a metropolitan area planning commission by resolution of the board of county commissioners, entered in the commissioners' journal of proceedings, setting forth its intention to avail itself of the provisions of this act and to enter into an agreement with the municipality for the organization of the metropolitan area planning commission herein provided for and upon such terms and conditions as may be agreed upon.
Okla. Stat. tit. 19, § 866.5