72 Pa. Stat. § 5860.610
In cases where the upset price shall not be bid at any such sale, the sale shall be continued, but not beyond the end of the calendar year, without further advertising, and the bureau may, at any time during or after the continuance, and shall, immediately at the written direction of a taxing district, file its petition in the court of common pleas of the county to sell the property under sections 612 and 612.1. The bureau shall set forth on the petition (1) the tax claim upon which the property was exposed for sale, (2) that neither the owner, his heirs or legal representatives or any lien creditor, his heirs, assigns or legal representatives or other person interested has caused stay of sale, discharge of tax claim or removal from sale, (3) that the property was exposed to public sale and the date of such sale, (4) that before exposing the property to public sale the bureau fixed an upset price, as herein provided, and (5) that it was unable to obtain a bid sufficient to pay said upset price. Upon the presentation of such petition, accompanied with searches, showing the state of the record and the ownership of the property and all tax and municipal claims, liens, mortgages, ground rents, charges and estates against the same, the court shall grant a rule upon all parties thus shown to be interested to appear and show cause why a decree should not be made that said property be sold, freed and cleared of their respective tax and municipal claims, liens, mortgages, charges and estates, except separately taxed ground rents. The rule shall be made returnable in not more than thirty (30) days from the date the petition was presented or as otherwise determined by the court.
72 P.S. § 5860.610