Architectural and archaeological investigations by John Milner Architects revealed a number of significant features including leaded-glass casement sash in walnut frames, wood-pegged flooring, stenciled stairway and traces of construction pre-dating 1696. With each section now restored to its respective period, the building has unique interpretive value. Constructed in four stages: 1696, 1730, 1780 and 1860, the Thomas Massey House is a rare example of three centuries of residential architecture in Pennsylvania and the Delaware River Valley.