The Harold Washington Library Center is the central library for the Chicago Public Library System. It is named for former Mayor Harold Washington. 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. At approximately 756,640 square feet (70,294 m2), it the largest public library building in the world.

The building was designed by the architectural firm of Hammond, Beeby and Babka, now known as Hammond Beeby Rupert Ainge, Inc., winners of a design competition held in 1987 to replace the old central library, which had been housed in the present Chicago Cultural Center.

en.wikipedia.org/wiki/Harold_Washington_Library