 Floors 2 to 33 are occupied by several businesses, with Daewoo occupying levels 9 to 21.The 36th and 37th floors are allocated for banquets, restaurants, meeting rooms and other formal activities, while floors 38 to 64 features a residence hotel with 423 guest rooms, including a penthouse on the upper floor.In February 2010, the 65th-floor observatory temporarily opened to the public for the G-20 major economies meeting of finance ministers.