The total area of the national historic site as established or as enlarged by transfers pursuant to sections 450ff to 450ff–2 of this title shall not exceed ninety acres. Establishment of the historic site shall be effective, upon publication in the Federal Register of notice of such establishment, following the transfer to the Secretary of the Interior of administrative jurisdiction over such lands as the Secretary of the Interior shall deem to be sufficient for purposes of establishing the national historic site. Additional lands may be added to the historic site in accordance with the procedure prescribed in section 450ff of this title