For $31 million, Mark Zuckerberg and Priscilla Chan sell their San Francisco home.

A spokesman for the family confirmed that Mark Zuckerberg and Priscilla Chan sold one of their San Francisco properties for $31 million in an off-market transaction.

According to Zilllow, the transaction represents the most expensive sale in San Francisco so far this year. The 7,386 square foot property, which is on the border of the Mission District and Dolores Heights sections of the city,

was built in 1928 and features four bedrooms and four bathrooms. Although the deal was completed on July 1, the documents have just recently been made accessible to the public.

According to documents with PropertyShark, the 38-year-old co-founder of Facebook and Meta and his wife, 37, bought the house in 2012 for little under $10 million through a California limited liability company, SFRP.

The Chan Zuckerberg Initiative's vice president of operations, Na'eem Salaam, signed a grant document between the seller and the buyer on behalf of SFRP.

The arrangement was verified by an organisation spokesperson, but Mr. Zuckerberg and Ms. Chen were unavailable for comment.

According to PropertyShark data, the purchase was a limited liability business located in Delaware. Although Michael M. Gordon, a director at the Wilmington law firm of Gordon, Fournaris and Mammarella, was named as the contact for the LLC, 

Mansion Global was unable to determine the buyer's identity further. When asked for comment, he did not respond right away.

The Chan Zuckerberg Initiative was established in 2015 with the stated mission of "helping tackle some of society's hardest challenges—from eliminating cancer and boosting education, to addressing the needs of our local communities." The co-founders and co-CEOs are Ms. Chan and Mr. Zuckerberg.

According to Mansion Global, they paid $53 million for nearly 600 acres of land on the Hawaiian island of Kauai last March. Their entire land holdings on the Hawaiian island now exceed 1,300 acres.