16 U.S. Code § 698s - Acquisition
Subject to paragraphs (2) and (3), the Secretary is authorized to acquire lands, waters, and interests in lands and waters within the boundaries of the Preserve by donation, purchase with donated or appropriated funds, or exchange.
The Secretary may not acquire lands, waters, or interests in lands and waters for the Preserve without the consent of the owner.
Immediately after publication of a description of the boundaries of the Preserve in accordance with section 698q(d) of this title, the Secretary shall commence negotiations for the acquisition of the lands, waters, and interests in lands and waters within the boundaries of the Preserve.
Any audit described in paragraph (1), and any environmental audit performed by the owner of the property and submitted to the Secretary prior to the date of the acquisition, shall be included as part of the documents transferring title to the property to the United States.
No lands or interest in lands may be added to the Preserve after October 21, 1992, without specific authorization by Congress and the consent of the owner of the lands or interest.