San FranciscoSan Francisco City HallCity Hall1912 – 19151912 – 1915Constructed underConstructed underMayorMayor““Sunny”Sunny”Jim Rolph, Jr.Jim Rolph, Jr.19161916City Hall opened toCity Hall opened tothe public inthe public inMarch of 1916March of 1916$5,408,000$5,408,000City Hall costCity Hall cost$5,408,000$5,408,000(that’s over(that’s over$400,000,000$400,000,000in today’s dollars)in today’s dollars)
How big is City HallHow big is City Hall??overover 500,000500,000 square feetsquare feetoccupiesoccupies two full blockstwo full blocks of San Franciscoof San Francisco
what’s that I seewhat’s that I see ??In the rotunda of City Hall…In the rotunda of City Hall…• Walls are made of limestone fromColorado• Floor is made of pink marble fromTennessee• Ever notice the four medallionssymbolizing equality, strength, libertyand learning? Just look up!• In 1954, Joe DiMaggio and MarilynMonroe wed in the rotunda!In the Board of SupervisorsIn the Board of SupervisorsChamber...Chamber...• The wood paneling is carved fromManchurian oak, which no longerexists in the world!• Benches and desks are made fromCalifornia oak• Ceiling is cast plaster that’s made tolook like wood• Notice the dahlias in the carpetdesign? The dahlia is San Francisco’sofficial flower.
1999 Restoration• The total constructioncost was $293 million• Cost of the gold on thedome was $400,000• 600 base isolatorsunder the building• Dome is supported by1,200 tons of steelThe Loma Prieta earthquake of 1989 damaged City Hall’sstructure and twisted the dome four inches (102 mm) onits base. Engineers recommended a base isolationsystem to strengthen the building against futuredamage.During an earthquake, the dome acts as a pendulum.The base isolation system separates the building fromthe ground, thus disrupting seismic waves before theycan affect the structure.A four-foot moat around the building allows it to moveside-to-side without being attached to the earth.San Franciscos City Hall is currently the worlds secondlargest base-isolated structure (after the InternationalTerminal at San Francisco International Airport) –a triumph of seismic retrofitting.City Hall reopened after its seismic upgrade in Januaryof 1999.