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CHICAGO — Work is complete on the $75 million renovation of 400 S. Jefferson St. in Chicago, which will serve as the new headquarters for Hillshire Brands Co., formerly known as Sara Lee Corp. The project included repurposing an existing, 300,000-square-foot industrial building, with crews demolishing the building to its cast-in-place concrete skeleton and rebuilding the new exterior. The project team included Leopardo, the general contractor; Sterling Bay Cos., the owner and developer; Proteus Group, the architect; Project Management Advisors, the project manager; and Colliers International, the tenant representative.