Among Wright's most significant alterations was the addition of white marble with Persian-style ornamentation. The marble and decorative details added a sense of luxury to the lobby's steel-laden interior, marked by Burnham and Root's skeletal metal ribbing. The entire interior space is bright and open. A double set of curving, heavily ornamented stairs wind upward from the lobby's second floor into the building's interior. A wrap-around balcony on the second floor enhances the feeling of being within the interior of a "clockwork." The Wright remodel opened the building up to more of the available light.