16 U.S.C. § 460s-10
Any owner or owners of improved property on the date of its acquisition by the Secretary may, as a condition to such acquisition, retain, for a term of not to exceed twenty-five years, or for a term ending at the death of such owner or owners, the right of use and occupancy of such property for any residential purpose which is not incompatible with the purposes of this subchapter or which does not impair the usefulness and attractiveness of the area designated for inclusion. The Secretary shall pay to the owner the value of the property on the date of such acquisition, less the value on such date of the right retained by the owner. Where any such owner retains a right of use and occupancy as herein provided, such right during its existence may be conveyed or leased for noncommercial residential purposes in accordance with the provisions of this section.
Any deed or other instrument used to transfer title to property, with respect to which a right of use and occupancy is retained under this section, shall provide that such property shall not be used for any purpose which is incompatible with purposes of this subchapter, or which impairs the usefulness and attractiveness of the lakeshore and if it should be so used, the Secretary shall have authority to terminate such right. In the event the Secretary exercises his power of termination under this subsection he shall pay to the owner of the right terminated an amount equal to the value of that portion of such right which remained unexpired on the date of such termination.
Any land acquired by the Secretary under this subchapter on which there is situated a cottage or hunting lodge which, on December 31, 1964, was under lease to any lessee or lessees shall, if such lease is in effect on the date such land is so acquired, be acquired by the Secretary subject to such lease and the right of such lessee or lessees to continue using the property covered by such lease in accordance with the provisions thereof. Upon the expiration of such lease, the Secretary shall have the authority to enter into a lease with such lessee or lessees authorizing them to continue using such cottage or lodge (as the case may be) for a term of not to exceed twenty-five years, or for a term ending at the death of such lessee or lessees, subject to such conditions as may be prescribed by the Secretary.
16 U.S.C. § 460s-10