The survey by Beauchamp Estates and Dataloft looks at ultra-prime property values, billionaire lifestyles and billionaire property assets across Western Europe.
London's wealthiest reside in the so-called 'platinum triangle' which comprise the upmarket districts of Mayfair, Knightsbridge and Belgravia. Leafy St John's Woods and Regent's Park are also favorites.
Billionaires typically pay around £21.7 million ($36.1 million) for a Mayfair mansion, while similar properties in St John's Wood and Regent's Park go for around £22.3 million.
They tend to own four homes worldwide and on average, this includes a £22.3 million mansion in London; a £18.6 million holiday home on the French Riviera and a £12.1 million Tuscany estate.
And when it comes to choosing a mansion, a billionaire is most likely to be swayed by a property's location, size, outside space, security and design.
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The average billionaire is worth a whopping £1.79 billion. They generally hold 42 percent of their wealth (£750 million) in private holdings; 35 percent (£626m) in publicly-held companies; 18 percent (£325 million)in cash; 3 percent (£50 million) in residential real estate and 2 percent (£35 million) in luxury assets such as yachts and private jet travel, according to the report.
The survey also found that there are over 2,170 billionaires globally with a combined net worth of £3.88 trillion. Of these, 60 percent are self-made.
The French Riviera is the favorite for billionaire beach-side mansions and has around 39 such homes. The social calendar of a typical billionaire also lends itself to the location as it is in close proximity of the Grand Prix and Cannes Film Festival.
A six- to seven-bedroom beach mansion on the French Riviera costs around £18.6 million.
Other popular sunny spots include Tel Aviv/Israel (39), Tuscany (14) and Greece and the Greek islands (9).
Billionaire mansions on the Greek islands typically cost about £4.15 million.