<Tr> <Th_colspan="2"> Design and construction </Th> </Tr> <Tr> <Th> Architect </Th> <Td> Helmut Jahn </Td> </Tr> <P> The James R. Thompson Center (JRTC) is located at 100 W. Randolph Street in the Loop district of Chicago and houses offices of the Illinois state government . </P> <P> The building opened in May 1985 as the State of Illinois Center . It was renamed in 1993 to honor former Illinois Republican Governor James R. Thompson . The property takes up the entire block bound by Randolph, Lake, Clark and LaSalle Streets, one of the 35 full - size city blocks within Chicago's Loop . In front of the Thompson Center is a sculpture, Monument With Standing Beast, by Jean Dubuffet . The Thompson Center is sometimes referred to as the State of Illinois Building . </P>

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