Facebook will expand its main UK offices by three quarters after it signed a new agreement with British Land, the owner of the central London development Regent's Place. The deal will add a further 66,000 sq ft to the social network's existing 87,000 sq feet at the site, located north of Euston Road between Baker Street and Euston stations. It follows Facebook's decision to withdraw from its 36,000 sq ft offices in Covent Garden. That site is now leased by King Digital, the maker of the smartphone game Candy Crush Saga.