71 Pa. Stat. § 1563
The Secretary of Property and Supplies, with the approval of the Governor, shall have power to enter into contract with any person, firm, or corporation which shall agree to lease within the city of Pittsburgh or the county of Allegheny, or within the city of Philadelphia or county of Philadelphia, at a location suitable to the Governor and the Secretary of Property and Supplies, a suitable office building in each of the respective counties above mentioned, for the use of agencies of the Commonwealth, and to agree, on behalf of the Commonwealth of Pennsylvania, to lease said building for a period of not more than thirty years, at such rental and subject to such terms and conditions as may be agreed upon, and any such contract shall provide that upon the termination of said thirty year lease the building so leased and the ground on which the property is situated shall become the property of the Commonwealth, and any such lease shall provide that at any time during the period of said lease the Commonwealth is empowered to accept title in fee simple to any such land and building under said lease: Provided, That no additional moneys are paid in consideration for the said deed.
71 P.S. § 1563