Pennsylvania Statutes Title 53 P.S. Municipal and Quasi-Municipal Corporations § 7181. Intervening or substituted defendants

Any person having an interest in the property, whensoever acquired, may, after ten days' prior notice in writing, by leave of court, intervene as a party defendant and make defense thereto, with the same effect as if he had been originally named as a defendant in the claim filed.  And the claimant may, by writing filed at his costs, strike off the name of any defendant therein, and may substitute as a defendant, and issue a scire facias against, any person who may have any interest therein as owner, or who is the personal representative of an owner who has died either before or after filing the claim, but such substitution shall always be without prejudice to any intervening rights.