 It was topped by an octagonal ornament shaped similarly to the terraced trading pits and was designed in a postmodern style by Helmut Jahn.Colored black and silver, with a sunlit atrium on the 12th floor facing the south wall of the older structure, the annex provided a four-story granite lined agricultural trading floor, then the world's largest at .Even as the Sydney Futures Exchange and other markets were ceasing outcry trading, Mayor Richard M. Daley led the groundbreaking on January 17, 1995, for additional expansion into a five-story building to the east designed by architects Fujikawa Johnson and structural engineers TT-CBM.