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CHICAGO — The U.S. General Services Administration (GSA) has signed a lease for 28,080 square feet of space at Congress Center, a Class A office building located in Chicago's West Loop. The GSA already leases 113,458 square feet of the building, a 16-story, approximately 520,000-square-foot structure situated at 525 W. Van Buren St. The GSA plans to take occupancy of the new space by mid-2010. Mark Parrish of Grubb & Ellis' Chicago office, with assistance from the company's Washington, D.C.-based Government Services Group, represented the landlord, Grubb & Ellis Realty Investors. Jason Volpe and Jason Lichty of Studley represented the GSA.