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Optima Chicago Center's exterior building aesthetics evolve from an expression of the functional spaces withih - transparent glass at the street level, black translucent glass at the parking level and energy efficeint silver metallic glass on the residential floors.

The grand opening of Optima Chicago Center is Oct. 5-6, and the public is invited to tour model units of the 42-story luxury rental building at 200 E. Illinois St. in Chicago's Streeterville neighborhood.