The Most Expensive Billionaire Homes In The World In 2014

1. Antilia, Mumbai, India

Owner: Mukesh Ambani, net worth $23.9 billion

Value: upward of $1 billion 

The twenty-seven story, 400,000-square foot skyscraper residence, named after a mythical island in the Atlantic, has six underground levels of parking, three helicopter pads, a 'health' level, and reportedly requires about 600 staff to run it. It is the world's most expensive home far and away with construction costs topping $1 billion

2. Villa Leopolda, Villefranche-sur-mer, France

Owner: Lily Safra, net worth $1.3 billion

Purchase Price: 500 million euro ($750 million at the time) in 2008

King Leopold II reportedly built a series of waterside homes for his many mistresses. This 20-acre estate was valued at 500 million euros in 2008, when Russian billionaire Mikhail Prokhorov attempted to buy it. He eventually pulled out of the deal, forfeiting a 50 million euro deposit.

3. Fair Field, Sagaponack, N.Y.

Owner: Ira Rennert, net worth $6 billion

Property value: about $248.5 million, according to 2014 tentative tax assessment

The industrial billionaire's hulking 29-bedroom, 39-bath Hamptons compound has not one, but three swimming pools, plus its own power plant on premises.

4. One Hyde Park, London, U.K.

Owner: Unknown

Sale Price: $237 million in May 2014

The latest penthouse to sell at One Hyde Park reportedly went to an Eastern European, who paid 140 million pounds, shattering the prior record for world's most expensive apartment. Prior to this sale, another penthouse in the tony Knightsbridge area of London held the title, having sold for $221 million in 2011. 

5. Kensington Palace Gardens, London, U.K.

Owner: Lakshmi Mittal, net worth $16.6 billion

Purchase Price: £117 million ($222 million at the time) in 2008

The steel magnate is believed to own three homes on the high-security street known as Billionaires Row, including a neo-Georgian mansion near the Israeli embassy. The home (not pictured), rumored to have been purchased for Mittal's son, was sold by hedge fund billionaire Noam Gottesman. It is reportedly up for sale.

6. One Hyde Park, London, U.K.

Owner: Rinat Ahkmetov, net worth $11.8 billion

Sale Price: $221 million in 2011

The world's most expensive apartment, located in posh Knightsbridge, was purchased by the Ukraine's richest man. It boasts a staggering 25,000-square feet, bullet proof glass and 24-hour hotel concierge service.

7. Ellison Estate, Woodside, Calif.

Owner: Larry Ellison, net worth $51.4 billion

Value: estimated $200 million to construct

The Oracle founder, arguably the world's most avid collector of real estate, built his 23-acre Japanese-style estate in 2004 with 10 buildings, a man made lake, a tea house, a bath house and a koi pond. The property is was assessed at $73.2 million in 2013.

8. Kensington Palace Gardens, London, U.K.

Owner: Roman Abramovich, net worth $9.4 billion

Purchase Price: £90 million (about $140 million) in 2011 

The Russsian tycoon owns several huge London estates (not pictured), including a Billionaires' Row mansion. Since purchasing, plans to build a subterranean extension that includes a tennis court, health center and auto museum were approved by the city. He also owns a French Riviera chateau and in 2009 spent a record $90 million on a 70-acre estate on St. Bart's.

9. Blossom Estate, Palm Beach, Fla.

Owner: Ken Griffin, net worth $5.2 billion 

Total Purchase Price: nearly $130 million in December 2012 

The hedge fund titan purchased four side-by-side properties totaling eight acres on the ocean. Three lots tout houses while the fourth was already torn down; the entire swath of property was once used as a single estate.

10. Xanadu 2.0, Seattle, Wash.

Owner: Bill Gates, net worth $77.5 billion

Market Value: $120.5C million, 2014 tax assessment

The high-tech Lake Washington complex owned by the world's second-richest man boasts a pool with an underwater music system, a 2,500- square foot gym and a library with domed reading room.

(From Forbes.com)