This combined-use building (offices, stores, and apartments), designed by the Chicago architects, Holabird and Roche, was named for the developer George Cook's father, Aquila Cook. The structure is designed in a U-shape around a central courtyard surrounded by an arcade.
This symmetrical four-story limestone building is neoclassical in style with classical pilasters and engaged columns, balustrades, some pedimented windows, and other classical ornamentation.
The flat roof has mansard sections at the corners and entrance. Above the entrance two plaques display the portraits of George Cook and his father Aquila Cook. The plaque between these represents an eagle (Aquila in Latin means eagle.)