Motor Mart Building
- Also Known As: Commerce Building
- Address: 520 Nebraska St
Constructed in 1912, the Motor Mart in Sioux City, Iowa, was specifically designed to display, repair and provide parking for automobiles during the city's early automotive boom. One of Sioux City's first reinforced, poured-concrete buildings, it is also the earliest local structure to incorporate Claude A P Turner's flat-slab mushroom system, patented in 1908. Built by the C F Lytle Company and designed by E J Henriques, the building stands among a broad wave of pre-World War I commercial development, reflecting the period's rapid growth and the emerging architectural demands of the automobile industry. - AsNotedIn