Possible inclusion of additional areas

(a) Affiliation authority Any site associated with the Civil War defenses of Washington that is owned by a private individual or organization or a unit of local government in the District of Columbia, Virginia, or Maryland, other than those listed in section 4, that the Secretary determines is eligible for affiliation with the National Historical Park, may be affiliated with the National Historical Park pursuant to a cooperative agreement entered into between the site owner and the Secretary. The Secretary may purchase such properties from willing sellers, subject to the availability of private sector donated funding or appropriations. (b) Consent required No non-Federal property may be included in the National Historical Park without the written consent of the owner of the property. (c) Prohibition on use of condemnation The Secretary may not acquire by condemnation any land or interest in land under this Act or for the purposes of this Act. (d) Consultation and public participation The Secretary shall consult with interested officials of State governments and units of local government, representatives of interested organizations, and interested members of the public before executing a cooperative agreement under this section or section 7(d).