Marin County's $50M Belvedere Island Mansion by Wurster and Church

An off-market modernist mansion situated on Belvedere Island has been listed for $50 million by Compass agents Bill Smith and Ann Aylwin. Designed by architect William Wurster and landscape architect Thomas Church, the residence was completed in 1967 for Leonard M. Sperry Jr., a deputy attorney general, and his wife, Rita. It previously changed hands in 1979 for $1.2 million. Following a $5 million renovation, the 9,170-square-foot property boasts eight bedrooms, nine bathrooms, and two powder rooms across three levels, accessible via an elevator and a skylit staircase. The upper deck provides sweeping views of San Francisco and the Golden Gate Bridge, while the grounds feature a pool, sport court, and parking for 12 vehicles. A sale near the asking price would establish a new record for Marin County.