53 Pa. Stat. § 1173
Any person claiming a reversionary or other interest in and to such property, or any part thereof, may, within six years of the date of such vesting of title in fee simple in the municipality, petition the court of common pleas of the county in which said real estate is situated, setting forth in such petition the chain of title whereby his claim arises, together with the names and addresses of all persons so far as they are known to him whose interests may be affected, and with a reference to the record of all deeds, wills, intestacies, court proceedings, or other muniments of title tending to prove or substantiate his claim. The court shall cause notice to be given to all persons so named, and hear such testimony as may be required to determine the proportionate interest, if any, of such claimant and such other persons, and shall appoint a board of view to hear testimony, to determine the value, if any, of the entire unacquired interest in said real estate, and to award to petitioner or other persons appearing entitled thereto, his or their proportionate parts or shares of such amount. Either claimant, or other such person, or the municipality shall have the right to file exceptions or to appeal, with a right of trial by jury, as in other cases: Provided, however, That a final determination, as hereinabove provided for, shall be conclusive of the matters so determined: upon any subsequent And provided, further, that the valuation of any such property shall be based upon its condition and worth as of the time that the municipality perfected its fee simple title, as hereinabove provided, and that if the municipality shall have sold such real estate, either at public or private sale, prior to such determination, the price or sum received at such sale shall be prima facie evidence of the value of such real estate or such part thereof as may have been so sold, with due allowance for improvements or other changes of condition between the time when the municipality perfected its title as aforesaid and the time of such sale.
53 P.S. § 1173