53 Pa. Stat. § 7110
In all cases where a tax or municipal claim is levied on or filed against separate and distinct properties as one estate, it shall and may be lawful for the proper public authority, either before or after filing a claim therefor, to apportion the same ratably upon the separate and distinct properties so assessed together. And the court in which the claim is filed, on proof that the properties were separate and distinct at the time the tax was levied or the work was done, shall, at any stage of the proceedings, apportion the charge against such properties. When apportioned, they shall be treated and considered in all respects as if separate and distinct claims had been filed; and payment and satisfaction of any one portion may be made without prejudice to the claim as against the rest.
53 P.S. § 7110