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This very early stone house is so named as one of the William Penn family's forty-four original manors. Built by George Ross, the house is only a few hundred yards from the Allegheny River and its confluence with Crooked Creek. The gable-roofed, two-story house has returning eaves, multipaned double-hung windows, and elegant porches that date c. 1870s. The frame portion on the west elevation was probably added shortly after the original house was completed. The Ross family maintained the house and land throughout the nineteenth century with income from the saw and grist mills.