The Los Angeles County Arboretum & Botanic Garden has a large archive of historic photographs relating to Rancho Santa Anita, Elias J.(Lucky) Baldwin and this history of the Arboretum. It also holds thephotographic archive of William Chrisman Aplin (1912-1993) a photographer who worked for Sunset magazine and photographed extensively the plants and gardens of Southern California.

Mount Saint Mary's University was founded by the Sisters of St. Joseph of Carondelet in 1925 as the first Catholic women's college west of the Mississippi. It comprises two historic sites, the Chalon Campus high above Brentwood (1930), and the Doheny Campus, which occupies the former estate of Edward and Estelle Doheny, including the Doheny Mansion at 8 Chester Place (1899).