16 Pa. Stat. § 5621
Whenever in locating, relocating, opening, widening, straightening or extending any road or highway or parts thereof the same shall be found to pass through, take or injure buildings, barns or other valuable improvements thereon, the said viewers or a majority of them shall have the right to recommend that such buildings and improvements, situate in part or in whole on the road or highway so to be improved, opened, widened, straightened or extended, shall be permitted to remain thereon for such time as shall be deemed wise and proper, and if the court shall approve the finding and report of said viewers or a majority of them, the owner or owners of such buildings or improvements may continue to use and enjoy the same during the time so fixed and determined. In case of the destruction, vacation or abandonment of any such building within the time they are so authorized to remain, such owners or owner shall not have the right to re-erect and reconstruct or retake such buildings or improvements within the line of such road or highway.
16 P.S. § 5621