36 C.F.R. § 13.116

(a) A permittee shall not accrue a compensable interest in a cabin or other structure in a park area unless specifically authorized by Federal statutory law.

(b) A cabin or other structure in a park area may not be sold, bartered, exchanged, assigned or included as a portion of any sale or exchange of other property by a permittee unless specifically authorized by Federal statutory law.

(c) The Superintendent shall determine the extent and nature of a permittee's possessory interest at the time a permit is issued or denied.