In the event a dispute shall arise between the parties to this [contract, lease, etc.], the parties agree to participate in at least four hours of mediation in accordance with the mediation procedures of United States Arbitration & Mediation. The parties agree to share equally in the costs of the mediation. The mediation shall be administered by the offices of United States Arbitration & Mediation 500 N. Broadway, Suite 1800, St. Louis, MO 63102 (314) 231-4642.