Basic Data Grounds The 5 acres are planted in native alder, maple, and Douglas fir, kept as natural in appearance as possible. Most walkways are covered with slate. Concrete retaining walls are faced with sandstone and granite. Family wing The Gates family's 11,500-square-foot inner sanctum is surprisingly modest, with four bedrooms and quarters for a nanny. A four-car garage is attached. The lower levels include a techno-playland family room and an exercise facility that is better appointed than many health clubs. Guest wing The southern half of the main building, this wing contains the main entrance (with grand staircase), theater, library, formal dining room, reception hall, and conference facilities. It includes only two bedrooms. Basic data: Total assessed value: $53,392,200 Land value: $9,122,200 Estimated property taxes for 1998: $620,183 (based on 1997 rates) Waterfront: Approximately 500 feet Square footage, all structures: More than 66,000 (equal to 1.5 acres) Rooms: Seven bedrooms, 24 bathrooms (includes 10 full baths), six kitchens, six fireplaces Style: Pacific Northwest lodge Architects: James Cutler and Peter Bohlin Interior designer: Thierry W. Despont Primary contractor: Sellen Construction