36 C.F.R. § 51.57

If a concessioner requests arbitration of the construction cost of a capital improvement determined by the Director, the request must be made in writing to the Director within 3 months of the date of the Director's determination of construction cost under § 51.56. The arbitration procedures are described in § 51.51. The decision of the arbitration panel as to the construction cost of the capital improvement will be binding on the concessioner and the Director.