Pennsylvania Statutes Title 53 P.S. Municipal and Quasi-Municipal Corporations § 13810. Where city takes additional property from owner;  aggregate of damages

Where part of any land and property is acquired for an improvement, and the remainder, or a portion of the remainder thereof, in the same ownership, is acquired in the same proceeding as additional land and property, the portion of the damages, due to the acquisition of the land and property required for the improvement, shall be determined and stated separately from the entire damage due to each such owner.  In determining the damage due to the acquisition of that portion of such land and property which is required for the improvement, the same rule shall be applied as would govern the determination of damages for the taking of the land and property required for the improvement in case no additional land and property were acquired.  Where part of any land and property is acquired for the improvement, and the remainder, or a portion of the remainder thereof, in the same ownership, is acquired in the same proceeding as additional land and property, the damages due to the acquisition of title to the land and property required for the improvement shall, in every case, equal the amount which would be awarded to such owner in case only that part of his land and property which is required for the improvement were acquired.

The aggregate of damages, due to the acquisition of the land and property required for the improvement, shall be determined by the court or other tribunal authorized to determine the compensation to be paid to the owners, and, when so determined, be assessed as a part of the damages in the proceeding.