The Millinery Mart Building, located at 65 East Wacker Place in Chicago, was designed in 1928 by the architectural firm Rissman & Hirschfeld, which later became FitzGerald Associates Architects. This 24-story steel-framed structure, clad in dark red masonry, was established to centralize the millinery industry—the craft of hatmaking, particularly women's hats—in Chicago's "furniture row" district, providing proximity to the city's main exhibition hall, the Chicago Coliseum.

Following World War I, the consolidation of wholesale firms into Marshall Field’s Merchandise Mart inspired the creation of specialized business 'marts,' where multiple product lines were gathered in one location. The Millinery Mart Building became a hub for the city's millinery wholesalers, housing more than a third of them when fully occupied.

Originally addressed as 65 East South Water Street—a block-long shortcut between Michigan and Wabash Avenues just south of Wacker Drive—the street was renamed East Wacker Place in the late 1980s. Today, the building is best known as the home of Morton's Steakhouse.

The Millinery Mart Building is an example of early 20th-century commercial architecture, reflecting the economic and industrial growth of Chicago during that era. Its design and purpose highlight the city's role as a central hub for various specialized industries, including the millinery trade.