The Filoli Mansion and Garden were built and developed by Mr. and Mrs. William Bourn 11, owners of the Empire Gold Mine of Grass Valley. They hired Willis Polk, a well recognized architect, who had previously designed homes for them in Grass Valley and San Francisco. The home, built between 1915 and 1917, exhibits a Georgian Revival, architectural style. Exterior features include a Flemish brick exterior, French windows, arched double chimneys, a Spanish tile roof, and an overall English Country House resemblance. Interior features include beautiful carved moldings, inlaid parquet floors, marble fireplace facades, grand doorways, and 17 foot high ceilings in major rooms. The Mansion remains in its original setting, with native garden areas and lush landscaping. The Bourns resided at the estate until their deaths in 1936. The new owners of the property were Mr. and Mrs. William P. Roth, in whose possession it remained until 1975, when Mrs. Roth generously donated it to the National Trust for Historic Preservation.