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CHICAGO — The U.S. Environmental Protection Agency (EPA) has awarded the Energy Star designation to 123 North Wacker Drive, a 30-story office tower located in Chicago’s West Loop. Completed in 1987, 123 North Wacker contains 541,000 square feet of trophy office space. It was acquired in 2005 by Grubb & Ellis Realty Investors on behalf of tenant-in-common investors. The Energy Start program was introduced by the EPA in 1992 as a voluntary way for consumer products, homes and commercial buildings to reduce their environmental impact through energy efficiency.