San Francisco has several examples of flatiron construction.  The Columbus Tower, also known as the Sentinel Building, was begun before the 1906 earthquake and finished in 1907.  It stands at 916 Columbus Avenue.  It was designed by Salfield & Kohlberg.

The Flood Building at 870-898 Market Street was built in 1904 and survived the 1906 earthquake.  Mystery writer Dashiell Hammett, creator of Sam Spade, worked here, and ate nearby at John's Grill on Ellis Street.  It was built by James Leary Flood, son of the silver magnate James Clair Flood, and remains a family-owned office building.