21 Aug the mighty manhattan: oldest surviving skyscraper in the world with a purely skeletal supporting structure
constructed between 1889 and 1891, the manhattan building at 431 south dearborn street is recognized as the oldest surviving skyscraper in the world with a purely skeletal supporting structure. this 16-story landmark marked a major advance in early skyscraper engineering.
instead of relying on thick masonry load-bearing walls, the building’s weight is carried by an internal frame of iron and steel beams, allowing for greater height and more light. to address site constraints and avoid shifting weight onto neighboring properties, it used innovative steel cantilevers to transfer wall loads back to the interior columns. the building was designed by the chicago school firm jenney & mundie, led by william le baron jenney—often called the “father of the american skyscraper”—and william b. mundie.
on the upper floors, the facade shifts to warm buff and brown terra cotta tiles with glazed roman brick. jenney used these lighter materials to reduce the building’s dead load while adding expressive detail, including the distinctive terra cotta faces, or “gargoyles,” that look down toward the street.
chicago’s northwestern terra cotta company produced the building’s ornamental buff-colored terra cotta cladding and trim. the winslow brothers, also based in chicago, fabricated the intricate interior metalwork, including the copper-plated iron elevator grilles and staircase panels enclosing the open stairwell. several salvaged winslow fragments from the building are now preserved as significant historic artifacts in museums.
