The Harold Washington Library Center is the central library for the Chicago Public Library System. It is located just south of the Loop 'L', at 400 S. State Street in Chicago, in the U.S. state of Illinois. It is a full-service library and ADA compliant. As with all libraries in the Chicago Public Library system, it has free wifi internet service. The building contains approximately 756,000 square feet (70,200 m²) of space. The total square footage is approximately 972,000 square feet (90,300 m²) including the rooftop garden penthouse, according to the Zoning department of the city of Chicago.