A luxury penthouse in London has sold for a record-breaking £140 million ($220 million), as the market for “trophy homes” bucks the wider property slump.

The two-floor apartment at the One Hyde Park development in Knightsbridge features bullet-proof windows, an air purifying system and a panic room.

The new owners will have access to 24-hour room service from the neighbouring Mandarin Oriental hotel, and protection from SAS-trained security guards.

The £140 million price tag makes the penthouse the most expensive property in Britain, passing the £115 million paid for a flat at the exclusive 8 St James’s Square development in Westminster in 2008.

The flat is believed to cost more than £6,000 a square foot compared with the Kensington and Chelsea average of £1,214 and capital wide average of £450.

One Hyde Park, next door to the Mandarin Oriental Hotel, features more than 80 flats in four linked towers designed by architect Lord Rogers.

Around 65 percent of all the properties in the block, due to open later this year, have already been sold at an average cost of £20 million.

Yesterday, we revealed that British supercar maker McLaren will open a luxe new showroom in the development as well.

Via PropGOluxury – Telegraph