53 Pa. Stat. § 30910
The interests of all taxing authorities, having taxes or claims against any property sold to any city of the second class A by the city treasurer under the provisions of this act, shall be fixed and determined as of the time of the certification by the city treasurer, as provided for in section nine, and shall remain fixed without the necessity of filing or reviving liens or otherwise preserving such taxes or claims, and shall take priority over all mortgages, ground rents or claims whatsoever until said taxes or claims are fully paid, or otherwise divested by law, and if the said city received income from the property, it shall distribute any net income first to the cost of the treasurer's sale and the balance to the interested taxing authorities in proportion to their taxes and claims against the property, until such taxes and claims have been liquidated, and thereafter in proportion to their rate of tax levy within the city.
53 P.S. § 30910