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CHICAGO — J.C. Anderson has completed the build-out for Colliers International’s Chicago headquarters at 71 S. Wacker Drive. The global real estate services and investment management company has relocated its Chicago headquarters from 200 S. Wacker Drive. The space features raised flooring, open ceilings, new light fixtures and new painting. Irvine Co. owns 71 South Wacker, a 48-story office tower that was completed in 2005.