16 U.S.C. § 410z–1 — Acquisition of additional sites

(a) Studies: Besides the properties named in section 410z of this title, the Secretary must study these properties to see if they're feasible and suitable to add to Boston National Historical Park: (1) Boston Common; (2) the Dillaway-Thomas House; (3) the Thomas Crease House, also known as the Old Corner Book Store; and (4) the King's Chapel, Granary, and Copp's Hill burying grounds. While studying them, the Secretary may make tentative agreements with owners for including their property, and take options, for a small payment, to buy them — but no new property can actually be added to the park except by an act of Congress. (b) Cooperative agreements: (1) To further the purposes of section 410z of this title, the Secretary may sign cooperative agreements with the city of Boston, Massachusetts, or private organizations, to mark, interpret, restore, or give technical help preserving and interpreting the properties named in section 410z, or parts of them, when the Secretary thinks private, city, or state ownership works best, alongside the Boston National Historical Park. These agreements must let the Secretary, through the National Park Service, reach public parts of the property at all reasonable times, for tours and public interpretation, and must require mutual agreement before making changes to the property — except that no agreement may limit or control how a property customarily used for church purposes is used. The agreements may spell out in detail how much the Secretary will help restore, preserve, and maintain the property. (2) The Secretary may also agree with the Boston Public Library to distribute information about the park and the Freedom Trail. (c) Identification and marking: The Secretary may identify other significant colonial and Revolutionary-era historic sites in and around Boston connected to this park, and, with the owner's consent, may appropriately mark them and mention them in interpretive materials.