Keystone Building (Aurora, Illinois)

The Keystone Building, constructed in 1922 and listed on the National Register of Historic Places in 1980, is a significant example of Prairie Style architecture located on Stolp Island in Aurora, Illinois. Designed by renowned architect George Grant Elmslie, it is the largest private office building of its kind and features a unique triangular shape with a ground floor dedicated to individual shops. The building showcases intricate terra cotta details, decorative shields, and a striking facade made of brown glazed brick. Visitors can explore its historic significance as part of the Stolp Island Historic District, which includes a collection of Elmslie's commercial buildings, making Aurora a notable destination for architecture enthusiasts and history buffs alike.