 Collectively, the trading floors now encompass approximately .The logo of the CBOT represents a trading pit, and appears prominently on stonework facing Clark Street and on street-level barriers at the service entrance on Van Buren Street.The addition has a twelve-story atrium and melds historical and contemporary design with art deco references such as setbacks, central tower, symmetrical projecting wings, pyramidal roof and abstract cascade and scallop lobby design.