Security Bank Building, Neoclassical bank building in downtown Sioux Falls, United States
The Security Bank Building stands six stories tall at 101 South Main Avenue and was constructed with a steel frame covered in Bedford limestone. The structure showcases early 1900s building techniques and anchors a prominent corner in downtown Sioux Falls.
This structure was completed in 1916 as South Dakota's first steel-framed office building, with construction delayed by steel shortages during World War I. Its completion marked a turning point in regional building methods and set new standards for solid construction.
The building displays early 20th-century banking architecture with substantial Ionic columns and ornamental cornices that mirror the prosperity of that era. These design choices shape the downtown streetscape today and reveal how banks once communicated trust and stability through their facades.
The building sits in central Sioux Falls and is easily reached on foot from downtown areas. It has been recognized on the National Register of Historic Places since 1984 and remains an accessible landmark for visitors exploring the city.
Members of the notorious Dillinger Gang executed a spectacular robbery here in 1934, taking hostages during their getaway after stealing a significant amount of money. This event became a notable chapter in regional criminal history and is still remembered today.
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