Burnham's other works included overseeing the design for the 1893 Columbian Exposition in Chicago and designing the 1902 Flatiron Building in New York City.
In 2006, Michelangelo Real Estate Corporation acquired 17% of the Flatiron Building.
The "flatiron" V-shape of the building may have been a reason for its name.
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In the 1890s, it was replaced with the Gooderham's Flatiron Building.
Under the banner of First Second Books, located in the Flatiron Building in New York City, Siegel is the editor of works by authors and artists such as Joann Sfar, Eddie Campbell, Paul Pope, Jessica Abel and Lewis Trondheim, Jane Yolen, and Adam Rapp.
In 1915 Eastham left Clapp-Eastham to form the General Radio Company, first located on the third floor of a small flatiron building still standing at the corner of Massachusetts Avenue and Windsor Street in Cambridge, Massachusetts.