Frequented by royalty, celebrities and business leaders since it's opening in 1929, the historic Grosvenor House became a JW Marriott Hotel in September 2008 at the culmination of its restoration, which incorporated every aspect of the hotel. The hotel continues its time-honoured tradition for the exceptional style, service and facilities expected from a 5-star luxury hotel in London set in Mayfair. Regarded as the most elegant and flexible London conference and meeting facility, the hotel offers 31 recently renovated meeting rooms, most with natural daylight. The largest room is the Great Room which has a maximum capacity of 2,000 and is 3147 sq metres.