To include in St. Marks National Wildlife Refuge, Florida, the land and facilities comprising St. Marks lighthouse.

Revokes any reservation of specified public land within the external boundaries of St. Marks National Wildlife Refuge in Wakulla County, Florida, for lighthouse purposes by the Executive Order dated November 12, 1838, as amended by Public Land Order 5655, dated January 9, 1979.

Transfers administrative jurisdiction over such lands, including improvements, structures, and fixtures located thereon from the department in which the Coast Guard is operating to the Secretary of the Interior, without reimbursement.

Includes the lands as part of the St. Marks National Wildlife Refuge.

Subjects the transfer and administration of the lands to conditions and restrictions the Secretary of Homeland Security considers necessary to ensure maintenance of specified navigation functions.