<P> Many security measures are in place at Grimmauld Place: there are anti-Apparation charms, the place is Unplottable, the whole house is under a Fidelius charm and it is disguised from Muggles and other interlopers . In the seventh book, it is noted that the neighbours had long ago come to terms with the houses on their square running straight from 11 to 13 . It is as secure as any magical dwelling can be and can accommodate a large number of people . For this reason, it was chosen as the headquarters of the reconstituted Order of the Phoenix when Sirius offered it to the Order . Only magical people can see it, and only if told the location by the Secret Keeper himself . The house is even immune from the' Taboo' imposed by the Ministry of Magic after the coup d'état . This is known because Hermione Granger mentions Voldemort by name at least once whilst inside the house . </P> <P> Because Sirius was incarcerated in Azkaban, the house fell into disrepair over the next several years . When he later returned to his family home in the fifth book, it was a gloomy and unpleasant dwelling teeming with dust, decay, magical creatures, and various dangers . Harry inherits the house at the beginning of Half - Blood Prince after Sirius's death, although he donates it to the Order (wanting no connection to the place where Sirius felt trapped and useless before his death). </P> <P> In Deathly Hallows, it becomes a sanctuary for Harry, Ron, and Hermione while hiding from Voldemort . Harry loses the house to Voldemort when Corban Yaxley grabs hold of Hermione when she attempts to escape by Disapparition . She drops Yaxley off at 12 Grimmauld Place, thus revealing the location to Voldemort . </P> <P> The Claremont Square area of London was used for the exteriors of Number 12, Grimmauld Place . </P>

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