The authority of the Secretary of the Interior to acquire land and water for Everglades National Park shall on and after July 2, 1958 be restricted to the area within the boundary described in section
410i of this title. Notwithstanding the proviso contained in section
410 of this title, or any other provision of law, the said Secretary is authorized on and after July 2, 1958, within the boundary fixed in sections
410i to
410p of this title and with any funds made available for that purpose, to acquire land, water, and interests therein by purchase or otherwise.
The authority to acquire land, water, and interests therein within the park boundary fixed in section
410i of this title but outside the area designated in sections
410e to
410h of this title, is further subject to the right of retention by the owners thereof, including owners of interests in oil, gas, and mineral rights or royalties, and by their heirs, executors, administrators, successors, and assigns, at their election of the following: