40 U.S.C. § 8732: Acquiring land subject to limited rights reserved to grantor and limited permanent rights in land adjoining park property

fee title to land subject to limited rights, but not for business purposes, reserved to the grantor; and permanent rights in land adjoining park property sufficient to prevent the use of the land in certain specified ways which would essentially impair the value of the park property for its purposes. The reservation of rights to the grantor shall not continue beyond the life of the grantor of the fee. The Commission must decide that the permanent public park purposes for which control over the land is needed are not essentially impaired by the reserved rights and that there is a substantial saving in cost by acquiring the land subject to the limited rights as compared with the cost of acquiring unencumbered title to the land. The Commission must decide that the protection and maintenance of the essential public values of the park can be secured more economically by acquiring the permanent rights than by acquiring the land. All contracts to acquire land or rights under this section are subject to the approval of the President.