Bourn Mansion, Tudor and Georgian mansion in Pacific Heights, San Francisco, US

Bourn Mansion is a 28-room, 14-fireplace house at 2550 Webster Street in Pacific Heights, built in 1896 for William Bowers Bourn II. Its red clinker-brick facade, with a stone balcony and green metal lanterns flanking the entrance, resembles an English townhouse. The 9,762 sq ft (907 m²) interior was designed in a heavy, dark formalist style.

William Bowers Bourn II, who had inherited the Empire Mine at age 17, commissioned architect Willis Polk to design this house in 1896. Polk went on to design other Bourn buildings, including the Filoli estate in Woodside. The house was sold in 2010, then underwent a seismic retrofit in 2011 and a renovation in 2012.

In the 1970s the house belonged to socialite Arden Dee Van Upp, who with her partner held lavish rock-and-roll themed parties there. Her teenage daughter Tammy Ann performed belly dances with her large python Gideon, often seen at these parties.

The Bourn Mansion is a private residence at 2550 Webster Street, not open for tours, so visiting means viewing the brick facade and stone entrance from the street. The 2011 seismic retrofit and 2012 renovation followed the 2010 sale, when the house was listed at US$2.9 million with 14 bedrooms and 4.5 bathrooms.

In 1975, Arden Dee Van Upp's teenage daughter Tammy Ann drew national attention for belly-dance routines performed with her large python, Gideon, at parties in the house. The red clinker bricks of the facade and the carved stone balcony with its central medallion are details to look for from the street.