In April 1904 , Julia Morgan , an American architect and engineer who pioneered the aesthetic use of reinforced concrete , completed her first reinforced concrete structure , the 72-foot bell tower at Mills College , El Campanil , which is located across the bay from San Francisco . Two years later , El Campanil survived the 1906 San Francisco earthquake without any damage , which helped build her reputation and launch her prolific career . One of the first skyscrapers made with reinforced concrete was the 16-story Ingalls Building in Cincinnati , constructed in 1904
1906 San Francisco earthquake
1906 San Francisco earthquake
Reinforced concrete