The Merchandise Mart is the world's largest commercial center and largest wholesale design center. The enormous property is 42,000,000 square feet (3901927 square meters) and acts as one of Chicago's premier international business locations. The upper levels of office space, designer showrooms and conference center space are closed to the general public. The first two floors, however, have been converted into a full retail mall that includes a post office and a food court. For more information, visit the website.