When it was completed in 1903 in Cincinnati, the Ingalls Building became the tallest reinforced concrete building in the United States. Although its overall dimensions were only 50 x 100 feet, the 16-story structure was twice as tall as any previous reinforced concrete building. It offered economy, fire safety, strength, and durability.
All the important developments in reinforcing for concrete buildings up to that time came together in the Ingalls Building. These developments included heavy monolithic beam-and-slab construction with tension reinforcing, two-way reinforcing systems, and bent bars and stirrups. Also used were hoops and continuous helixes for compression members.
Now a National Historic Civil Engineering Landmark, the Ingalls Building still stands stout and proud, although its massive monolithic structure would be considered overkill in today's world of slender columns and high-strength concrete. Although expanding concrete technology and daring architectural concepts will continue to dwarf the 210-foot "skyscraper" at the corner of Fourth and Vine in Cincinnati, it will remain the forerunner of modern reinforced-concrete skyscrapers in the United States.