In a significant real estate transaction, a mansion in San Francisco's Gold Coast sold for $29.15 million after nearly two years on the market, initially listed at $32 million. Previously owned by tech entrepreneurs Michael and Xochi Birch, the custom-designed 11,690-square-foot property features luxury amenities and panoramic views, making it the second-largest sale in the city this year. Meanwhile, the East Bay estate formerly owned by late real estate developer Ken Behring was auctioned for $10.8 million, significantly below its $25 million asking price, after struggling to attract buyers. The sprawling 26,627-square-foot mansion, designed with influences from Frank Lloyd Wright, offers extensive luxury but faced limited interest over the past year. Both sales highlight current trends in high-end real estate, with properties selling below their initial valuations amid changing market dynamics.