The City Hall you see today took two years to build. Steel, granite, and four floors of white marble interiors make up San Francisco's symbol of resilience, built after the previous City Hall was destroyed in the Great Earthquake and Fire of April 18, 1906.
Civic leaders were determined to demonstrate the city's rebirth in time for the start of the World's Fair of 1915. Designed by architect Arthur Brown, Jr. and begun in 1913, natives and the world were suitably awed by the gilt exterior detailing, the sweeping grand staircase, and the massive dome. At 307 feet in height, the dome is a full 42 feet taller than the dome of the nation's capital.
During the past century, the building has seen major political upheavals and demographic shifts in the makeup of its legislators. City Hall is often a focus of drama: the tragic assassinations of 1979; and jubilation when same-sex marriages were first performed in 2004. Once the repository of records and a site for smaller courts, current debates and decisions about labor, land use, and public policy issues take place inside on a regular basis. City Hall has been a location for movies from Dirty Harry and Indiana Jones to Invasion of the Body Snatchers.
http://sfgov.org/cityhall/