Touted to be the most expensive flat in the world, One Hyde Park penthouse is estimated at $200 million.

The most expensive penthouse apartments will feature bullet proof windows, purified air systems and “panic rooms” and everyone on site will have access to an underground passage leading to the nearby Mandarin Oriental hotel.

Alhougth the image is not real, but a computer representation, it does give a view of what it will look like when completed in 2010.

Managed by brothers Christian and Nick’s development company Candy & Candy, the project features 80 flats designed by architect Richard Rogers with communal spas, squash courts and a private wine-tasting facility.

Majority of the buyers are Russians, making up a third of the total. A quarter of buyers are Middle Eastern, 20 per cent are British and the remaining 22 per cent is split equally between the European and American markets.