16 Pa.C.S. § 16105
(a) General rule.— The county commissioners may acquire real property by purchase for not more than the fair market value, gift, devise or eminent domain. The county commissioners may acquire, improve and maintain real property at the county seat or in other places as the county commissioners deem necessary for the purposes of a county courthouse, prison and other facilities necessary for county purposes. The fair market value of real property for a purchase valued in excess of $10,000 shall be determined by the county commissioners in consultation with two of the following: