Subject to the provisions of section 460aaa-2(b)(8) of this title and subsection (b) of this section, the Secretary is authorized and directed to acquire by purchase, gift, exchange, or otherwise, lands, waters, structures, or interests therein, including scenic or other easements, within the boundaries of the national recreation area to further the purposes of this subchapter: Provided, That the Secretary may not acquire any privately owned lands within the national recreation area other than with the consent of the owner so long as the owner agrees to the restrictions contained in subsection (b)(1) of this section and grants the Secretary a right of first refusal as provided in subsection (b)(2) of this section. The Secretary also is authorized and directed to acquire lands or structures by such means on the mainland to the extent necessary for access to and administrative facilities for the national recreation area. In acquiring lands or structures under this subsection, the Secretary is directed to give prompt and careful consideration to any offer to sell land or structures made by an individual, organization, or any legal entity owning property within the boundaries of the national recreation area.
16 U.S.C. § 460aaa-3