53 Pa. Stat. § 1333
Any sale or conveyance of land made pursuant to the provisions of this act shall be subject to the approval of the majority of the judges of the court of common pleas of the proper county, of the price agreed to be paid therefor, and the terms and conditions thereof. The county commissioners shall also submit to the judges aforesaid, for their approval, the plans adopted for the part of the building to be owned by the county, and also the portion of the building, if any, to be used by the county, in the part to be owned by such city; and when such approval is obtained the county commissioners shall have full authority to erect the part to be owned by the county, in conjunction with the erection by the city of the part to be owned by the city, on the site chosen, and in the manner aforesaid. The county commissioners and the corporate authorities, for the construction of such building, are authorized and empowered to enter into a joint contract for the payment of the whole, or a several contract for the payment by each of their proportionate share, of the cost of such building; and they are further authorized and empowered to make such other agreements, and to do such other acts, as may be necessary to fully exercise the powers herein conferred.
53 P.S. § 1333