53 Pa. Stat. § 27604
Act of May 26, 1943 (P.L. 629, No. 275), entitled, as amended, "An act relating to the filing and revival of liens for taxes, water rates, sewer rates and other municipal claims and charges, in the office of the prothonotary of common pleas court on real estate within the territorial limits of cities of the second class, prescribing duties and fees of prothonotaries; establishing the office of solicitor for liens for delinquent taxes, rates, claims and charges, defining the powers and duties of said office; providing for enforced collection of said taxes, rates, claims and charges; imposing duties upon cities of the second class, and school districts within the territorial limits of cities of the second class."
Act of July 5, 1947 (P.L. 1258, No. 514), entitled "An act authorizing and empowering city treasurers of cities of the second class to sell at public sale, lands or real estate upon which the taxes, assessed and levied by the city or school district, are delinquent and unpaid; fixing the interests of all taxing authorities where such lands are purchased by the city; providing for the distribution of moneys received as income from or resale of such lands; and providing for a method of reselling such lands purchased, by the city or by the city and school district within said city, at any sale for the nonpayment of taxes, free and clear of all mortgages, ground rents, interest in or claims against said lands."
53 P.S. § 27604