Address: 431 S. Dearborn St. Year Built: 1891 Architect: William Le Baron Jenney Date Designated a Chicago Landmark: July 7, 1978

The versatility and strength of metal frame construction made the skyscraper possible, as evidenced by this structure, which reached the then-astounding height of 16 stories in 1891. Its architect was a pioneer in the development of tall buildings. The distinctive bay windows provide maximum light to the building's interior spaces, while the combination of a granite (lower three floors) and brick facade (upper stories) help carry and lighten the load of the internal steel framework.

Le Baron Jenney
Early Skyscrapers The Loop
1.	View, circa 1892
2.	Window Detail, photo by Barbara Crane
3.	Dearborn Street Elevation, 1972
4.	Entrance Sign, photo by Hasbrouck/ Hunderman, 1983