 
 <prompt> Wetin be di most common type of room? Based on di previous question, write a context wey contain di answer. E fit be 1 - 20 sentences. Context: <response>: The palace dey measure 108 metres (354 ft) by 120 metres (390 ft), e dey 24 metres (79 ft) high and e get over 77,000 m2 (830,000 sq ft) of floorspace. The floor area dey smaller pass the Royal Palace of Madrid, the Papal Palace for Rome, the Louvre for Paris, the Hofburg Palace for Vienna, or the Forbidden City. E get 775 rooms, including 19 state rooms, 52 principal bedrooms, 188 staff bedrooms, 92 offices, and 78 bathrooms. The main rooms dey for the piano nobile behind the west-facing garden façade for the back of the palace. The Music Room dey for the centre of this ornate suite of state rooms, with the Blue and White Drawing Rooms on each side. The Picture Gallery dey for the centre of the suite, wey dey top-lit and 55 yards (50 m) long. The Gallery dey hung with plenty works by Rembrandt, van Dyck, Rubens and Vermeer; other rooms wey dey lead from the Picture Gallery na the Throne Room and the Green Drawing Room. The Green Drawing Room dey serve as big anteroom to the Throne Room, and e dey part of the ceremonial route to the throne from the Guard Room for the top of the Grand Staircase. The Guard Room get white marble statues of Queen Victoria and Prince Albert, wey dey wear Roman costume, set for tribune wey dey lined with tapestries. These very formal rooms dey use only for ceremonial and official entertaining, but dem dey open to the public every summer. 