What is the architectural significance of the Wainwright Building in St. Louis?

The Wainwright Building is architecturally significant primarily because it represents one of the early examples of a steel-framed skyscraper. Completed in 1891 and designed by Louis Sullivan, this building exemplifies the advancements in building technology during its time, particularly the use of steel frame construction. This innovation allowed for taller structures and opened the door for the skyscraper movement in the United States.

The Wainwright Building's design features a clear vertical emphasis and large, prominent windows that reflect the principles of the Chicago School of architecture, which includes both the use of steel framing and an aesthetic that emphasizes the building's height. The combination of these elements not only marked a shift in construction methods but also in architectural design, showcasing a functional yet visually appealing structure. The building's significance lies in how it set precedents for future skyscrapers, influencing urban architecture significantly.

While the building does relate to the Chicago School style, which is characterized by simplicity and the use of modern materials, it is its pioneering use of a steel frame that underlines its architectural importance.