Mark Zuckerberg and Priscilla Chan have reportedly sold their San Francisco home for a record-breaking $31 million in an off-market deal. The 7,386-square-foot home, which was built in 1928 and boasts four bedrooms and four bathrooms, was purchased by the couple in 2012 for just under $10 million. The sale, which took place on July 1st but has only recently become publicly available, marks the most expensive home sale in San Francisco so far this year. The buyer was a limited liability company based in Delaware, although their identity has not been revealed. Zuckerberg and Chan are the co-founders and co-CEOs of the Chan Zuckerberg Initiative, which aims to tackle societal issues such as disease and education