Hidden House opens up in back thanks to a disappearing glass wall that creates one big indoor-outdoor space.  Photo 1 of 17 in A London Mews Home With a Subterranean Dance Floor Asks £3.8M

A London Mews Home With a Subterranean Dance Floor Asks £3.8M

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Hidden House features a glass wall at the rear that retracts to create one big indoor/outdoor space.