San Francisco City Hall, which opened in 1916, is one of the finest examples of Beaux Arts architecture in the world, and is considered by preservationists to be one of the most significant interior spaces in the U.S. The whole of San Francisco’s Civic Center is designated a National Historic Landmark District, of which City Hall is a Contributor Building.

The Loma Prieta earthquake of magnitude 7.1 subjected City Hall to peak ground acceleration of up to .10 gravity forces. Kent M. Lim & Company, Inc. performed the mechanical portion of the seismic retrofit and earthquake damage repair within the strict historical preservation guidelines of the Secretary of the Interior.