Sarah Armstrong Wallis (1825-1905) was a pioneer in the campaign for women's voting rights. In 1870 she was elected president of California's first statewide suffrage organization which in 1873 incorporated as the California State Woman Suffrage Education Association. The home she built on this site, Mayfield Farm, was a center of suffrage activities attracting state and national leaders such as Susan B. Anthony, Elizabeth Cady Stanton, and Ulysses S. Grant.

California Registered Historical Landmark No. 969

Plaque placed by the State Department of Parks and Recreation in cooperation with the Women's Heritage Museum of Palo Alto and the City of Palo Alto, October 11, 1986.