; (2) purchase from a willing seller with donated or appropriated funds; (3) exchange; or (4) transfer from another Federal agency. (b) Outside boundary (1) In general Subject to subsection (c), the Secretary may acquire, using the methods described in subsection (a), land or interests in land located outside the boundary of the Recreation Area, in consultation with the Advisory Commission as described in section 11(b)(2)(B). (2) Inclusion in Recreation area On acquisition of land or an interest in land under paragraph (1), the boundary of the Recreation Area shall be modified to reflect the acquisition. (c) Limitation Any land or interest in land owned by a State or a political subdivision of a State that is within the boundary of the Recreation Area or described in subsection (b)(1) may be acquired only by donation. (d) Condemnation No land or interest in land may be acquired for the Recreation Area by condemnation unless the owner of the applicable land or interest in land consents to the condemnation. (e) Environmental quality standards Prior to the acquisition of land or an interest in land under this section, the Secretary shall ensure that the land or interest in land meets all applicable environmental quality standards. (f) Boundary adjustment As the Secretary determines to be necessary, the Secretary may make minor revisions of the boundary of the Recreation Area by publishing a revised map or other boundary description in the Federal Register. 6. Acquisition of land-based resources for the Chesapeake National Recreation Area (a) In general Subject to subsection (b), the Secretary may acquire land-based resources, including associated docks, piers, and structures extending into adjacent waters, within the boundary of the Recreation Area only by— (1) donation; (2) purchase from a willing seller with donated or appropriated funds; (3) exchange