55 ! after the building came under his control in 1820 he commissioned his favourite architect, john nash, to it on a more magnificent scale. build despite costly alterations, which reached around half a million pounds, the palace wasn't occupied until victoria became queen in 1837 and made it the royal residence in london. office the palace has 775 rooms, of which 19 are state rooms. but only two sections of the palace are open to the public: the royal mews which contain royal vehicles from coaches and rolls-royces to horses, and the queen's gallery, which displays paintings from the priceless royal collection. regular
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