The world’s most expensive residential apartments at One Hyde Park have been officially unveiled yesterday in London.

Around 350 guests were shown the apartments which reportedly start a £6.5m for one bedroom and go up to £140m for a penthouse. Prices average £6,000 a square foot, and are reportedly the highest ever paid for residential space.

60 percent of the apartments have already been snapped up, mainly by foreign business leaders from the Middle East, Africa, Russia, China and India.

The heart of Mumbai city, once a cotton mill hub, is seeing a rapid change in its skyline as more than 30 skyscrapers are mushrooming out of slumland in the city’s most congested district.

The transformation reflects the breakneck pace of growth in Asia’s third largest economy, as India’s property and capital markets boom and developers build dream homes for a rapidly-growing list of Indian millionaires.

Most of these high-rises, all over 40-storeys, are under construction while some are ready for owners to move in.

A penthouse flat in Monaco has been sold for €240M (US$304) in one of the most expensive residential property sales to date.

La Belle Epoque, a property occupied by Christian and his brother Nick Candy, has been bought by an unnamed Middle Eastern investor.

Each suite in the penthouse, the top two floors of a block of flats, has its own cinema, kitchen, dressing room and two bathrooms, and it has a spa, library and gardens.

Nicole Kidman and husband Keith Urban have splashed out $10million on a luxurious Manhattan penthouse apartment, into which they can drive their car.

Kidman and Urban’s new pad in Chelsea comes with an ‘en suite Sky Garage’, a car elevator that will let them take their limo all the way up to the 6th floor.

The building, which has stunning Hudson River views, is the first in New York City to get the feature, the Dailymail reports.

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.

Hong Kong officials said Wednesday they will look into the controversial sale of a luxury flat that fell through months after its developer said it had snatched world-record price.

Property giant Henderson Land Development revealed on Tuesday that sales of as many as 20 out of the 24 units at “39 Conduit Road” had been cancelled.

The scrapped deals included what was supposed to be the world’s most expensive apartment, a 6,158-square-foot duplex sold for $56.6 million in October.