History of San Luis Obispo

San Luis Obispo was also a popular stop on both U.S. Route 101 and California State Route 1 with the rise of car culture. Due to its popularity as a stop, it was the location of the first motel, the Milestone Mo-Tel.

Among San Luis Obispo's historical buildings is the former San Luis Obispo Carnegie Library, located at 696 Monterey Street. The San Luis Obispo Carnegie Library was built in 1905 with a grant of $10,000 from Andrew Carnegie, who funded the establishment of 142 California libraries in the early 1900s. The Romanesque style building was designed by architect W. H. Weeks of Watsonville, California and was built by contractor Joseph Maino of San Luis Obispo. As one of numerous California public buildings designed by W. H. Weeks, it shares features with Carnegie libraries in nearby Lompoc and Paso Robles. The San Luis Obispo Carnegie building served as the city library until 1955, when a new public library was built at the corner of Palm and Morro Streets. It has been home to the San Luis Obispo County Historical Museum since 1956. The Carnegie Library building is listed on the National Register of Historic Places.

San Luis Obispo's largest and oldest voluntary organization is the San Luis Obispo Chamber of Commerce, which also is the oldest and largest voluntary organization in San Luis Obispo County