36 Pa. Stat. § 3425
For the purpose of carrying into effect the provisions of this act, the joint commission is hereby authorized to purchase in the Commonwealth of Pennsylvania such lands, structures, rights of way, franchises, easements, or other interests in lands, including lands under water and riparian rights, of any person, railroad, or other public or private corporations or municipality, necessary for the building of said bridge and the approaches thereto, upon such terms, prices, or considerations as may be considered by it to be reasonable and can be agreed upon between it and the owner or owners. But if for any reason the said joint commission does not agree with the owner or owners of said lands or interests upon the price or consideration therefor and receive a proper conveyance or proper conveyances thereof, the said joint commission, having given to the owner or owners and the person or persons in possession thereof at least sixty days notice of its intention so to do, shall enter upon and take possession of said lands and interests in the name of the Commonwealth of Pennsylvania. Said joint commission is hereby authorized to accept on behalf of the Commonwealth of Pennsylvania any gifts of lands, rights or interests in lands, or other interests, contiguous or adjacent to said bridge in the Commonwealth of Pennsylvania or in the State of New Jersey, for the purpose of building the same. Such joint commission shall also have the power to alter or change the grade of any highway or public street when necessary for the purpose of carrying out the plans by it adopted. If it shall become necessary to change the location or gradient of any waterway, canal, railroad, or street railway, or the appurtenances thereof, the person or corporation owning and operating the same shall be required to so relocate and change the same so far as needful, and, if possible, to agree with said joint commission upon the details thereof; the costs thereof to be paid by said joint commission as part of the expense of said work.
36 P.S. § 3425