Horace C. Guittard , Étienne 's son , was in charge when the 1906 San Francisco earthquake destroyed the city . In the aftermath of the quake , a new plant was built on Commercial Street . The company expanded in 1921 and 1936 onto property on Main Street south of Market . In 1954 , Guittard sold its property to the city so that Embarcadero Freeway could be built . The company relocated to a facility at the corner of Guittard and Rollins road in Burlingame , California , where it is still located today
1906 San Francisco earthquake
1906 San Francisco earthquake
Guittard Chocolate Company