16 U.S. Code § 410eee–2 - Adams National Historical Park
In order to preserve for the benefit and inspiration of the people of the United States as a national historical park certain properties in Quincy, Massachusetts, associated with John Adams, second President of the United States, his wife, Abigail Adams, John Quincy Adams, sixth President of the United States, and his wife, Louisa Adams, there is established the Adams National Historical Park as a unit of the National Park System.
The historical park shall be comprised of the following:
(1) All property administered by the National Park Service in the Adams National Historic Site as of November 2, 1998, as well as all property previously authorized to be acquired by the Secretary for inclusion in the Adams National Historic Site, as generally depicted on the map entitled “Adams National Historical Park”, numbered NERO 386/80,000, and dated April 1998.
(c) Visitor and administrative sites
To preserve the historical character and landscape of the main features of the historical park, the Secretary may acquire up to 10 acres for the development of visitor, administrative, museum, curatorial, and maintenance facilities adjacent to or in the general proximity of the property depicted on the map identified in subsection (b)(1)(A)  of this section.
The map of the historical park shall be on file and available for public inspection in the appropriate offices of the National Park Service.
 So in original. Probably should be subsection “(b)(1)”.