Ingalls Building

The Ingalls Building, built in 1903 in Cincinnati, Ohio, was the world's first reinforced concrete skyscraper. The 16-story building was designed by the Cincinnati architectural firm Elzner & Anderson and was named for its primary financial investor, Melville E. Ingalls. The building was considered a daring engineering feat at the time, but its success contributed to the acceptance of concrete construction in high-rise buildings in the United States.

• http://en.wikipedia.org/wiki/Ingalls Building