The Blacks were shown to be very anti-Muggle. Their house has anti-Muggle spells placed on it. Yet, their house is placed in a Muggle neighborhood, with a Muggle number.


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    Kudos for trying to expand the collective knowledge of the community, just watch out for other people who had the same question – Jason Baker Jun 3 '15 at 3:50

J.K. Rowling answered this in a Twitter interview: https://twitter.com/jk_rowling/status/563635069102080000

A Black ancestor coveted the beautiful house, so 'persuaded' the Muggle occupant to leave & put the appropriate spells on it.

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