36 Pa. Stat. § 1758-204
After the streets described in section 202 of this act shall have been taken over by the Commonwealth they shall be maintained, constructed, reconstructed and resurfaced by the Department of Highways at the expense of the Commonwealth and such construction, reconstruction and resurfacing shall be of such type as shall be determined by the Secretary of Highways, with the approval of the Governor, and repairs and maintenance shall be of such type as shall be determined by the Secretary of Highways. The obligation of the Commonwealth in the reconstruction, resurfacing or maintenance as hereinbefore provided shall be limited to that part of the street or section thereof between curb lines as established at the time of passage of this act, but shall not include the portions of such streets which are or may be used and occupied by the structures or surface facilities of any public utility company. It shall, nevertheless, be lawful for the Department of Highways to enter into agreements, in the discretion of the Secretary of Highways, with the city or with persons, associations or corporations for the sharing with the Commonwealth of the cost of construction, reconstruction or resurfacing of the streets or sections thereof taken over by the Commonwealth under this act.
36 P.S. § 1758-204