53 Pa. Stat. § 30911
If upon a resale by the city of any property purchased by it under this act, either for a sum sufficient to pay all taxes and claims, or for a lesser sum as provided hereinafter, it should be deemed necessary by said city to conduct proceedings, hereinafter set forth, to perfect its tax title acquired at the treasurer's sale, it shall be lawful for the said city to deduct the costs of said proceedings from the sale price, as well as the cost of the original tax sale and the usual commission to a real estate broker, if any, before distribution of the balance; and if the sale price or balance remaining is more than sufficient to pay all taxes and claims, then the sum left, after all taxes and municipal claims have been satisfied, shall be distributed to the interested taxing authorities in proportion to their rate of tax levy upon real estate within the city at the time of resale. If, however, such sum is less than all taxes and municipal claims, such sum shall be distributed to the interested taxing authorities in proportion to their total tax claims against the property regardless of priority of lien, and such taxes and municipal claims shall be considered as fully paid and satisfied.
53 P.S. § 30911