In order to minimize economic dislocation in acquiring property within the park, the Secretary may acquire with the consent of the owner, lands and interests in lands outside the boundaries of the park, but within the State of Washington, and with the concurrence of the Secretary of Agriculture, he may utilize lands and interests therein within a national forest in the State of Washington hereby authorized to be transferred to the Secretary, for the purpose of exchanging lands and interests so acquired or transferred for property within the park.