Thorsen House, Historic residence in Berkeley, California.

The Thorsen House is a 1909 residence in Berkeley, the last of five "ultimate bungalows" by Charles and Henry Greene. Its entry hall is paneled in Burmese teak, while the living and dining rooms use Honduras mahogany with square ebony plugs over brass screws. The living-room fireplace is set in mauve tile from the Grueby Faience Company.

It was built in 1909 for William Thorsen and represents the design principles of the American Arts and Crafts movement that shaped the era. This movement valued handcrafted quality over mass-produced industrial goods.

Since 1942 the house has been the home of the California Alpha Chapter of the Sigma Phi Society, the oldest national fraternity in continuous existence in the United States. Members live in the Greene & Greene rooms, hold communal dinners and small concerts, and give informal tours that bring in thousands of visitors a year.

The house can be toured informally throughout the week: visitors simply knock on the front door to be admitted. It is a student residence of the Sigma Phi Society, so visits depend on whoever is home at the time.

The front door and its side lights hold leaded art glass in the design of a gnarled grape vine, made by Emil Lange, who also created glass for the Gamble House. Greene & Greene were later called back to design extra furniture and modest additions for the Thorsens.