The original 10-story , structure was designed by Burnham and Root/D.H . Burnham & Company completed 1892 ; and after surviving the 1906 earthquake , was restored by Willis Polk in 1908 , who oversaw subsequent additions in 1914 and 1918 . Named for early San Francisco financial tycoon , Darius Ogden Mills , it is regarded as the city 's second skyscraper , after the Chronicle Building ( 1890 )
1906 earthquake
1906 San Francisco earthquake
Mills Building and Tower