Hiroshi Mikitani, worth $6.2 Billion

Forbes: Billionaire Home Sales

Purchased: $11.9 estate
Location: Million Britton Ave., Atherton, CA
Time of Purchase: September 2011

The online shopping mall founder snapped up a 6,212-square foot Valparaiso Park abode that was built in 2008. His new neighbors include fellow billionaires Meg Whitman, Charles Schwab and Eric Schmidt.

(Courtesy of Zillow)

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Inside Mega Mans... Forbes searched through property records and databases to unearth some of the biggest billionaire real estate transactions of the past year. Sticking only to single-family, condo and co-op sales of the past 12 months, the world’s richest people have been off-loading properties and snatching up new ones. Most of the purchases Forbes uncovered were secondary homes and for every transaction it identified there are dozens more that remain a mystery, since rich and famous home buyers tend to conduct their residential real estate dealings behind the privacy of anonymous third-party LLCs.

(Evan Kafka for Forbes)

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Peter Thiel, wor... Purchased: $11.5 million estate
Location: Los Angeles
Time of Purchase: March 2012

Purchased: $27 million beach estate
Location: Maui, HI
Time of Purchase: July 2011

The PayPal co-founder reportedly just bought a Hollywood Hills abode designed by renowned Hollywood Golden Age architect Paul R. Williams. The 1.25-acre estate has panoramic city views and two driveways that lead to two different streets. Last summer the Facebook investor bought an oceanfront Maui retreat believed at the time to be the biggest home sale ever in Maui County.

(Steve Strand)

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Edward Lampert, ... Purchase Pending: $40 million estate
Location: Indian Creek, FL Contract Entered: March 2012

The hedge fund billionaire behind Sears Holdings will break sales records once the purchase of his 2.7-acre, 17,000-square foot estate is complete. The home boasts an “arrival court” with reflection pool and sits on a exclusive island where fellow billionaires Carl Icahn, Charles Johnson and Norman Braman also own homes.

(ONE Sotheby's International Realty)

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Alexander Rovt, ... Selling: $27 million townhouse
Location: East 63rd Street, New York, NY
Bought: $33 Million Henry T. Sloane Mansion, New York, NY
Time of Purchase: July 2011

The fertilizer mogul spent four years and $18 million gut renovating E. 63rd St, adding an indoor pool and spa, a velvet home theater and gold finishes. He is selling it now because he plans to spend his time renovating the Sloane Mansion, a $30 million, two-year project, a few blocks away.

(Evan Kafka for Forbes)

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Ron Burkle, wort... Purchased: $4.5 million Ennis House Location: Los Angeles
Time of Purcahse: July 2011

The investor added Frank Llloyd Wright’s Ennis House to his collection of trophy homes in need of restoration. Inspired by a Mayan temple, the Los Feliz architectural icon was constructed from 27,000 concrete blocks and has played host to films like Blade Runner.

(AP)

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Silvio Berluscon... Purchased: Historic Villa
Location: Lake Como, Italy
Time of Purchase: March 2012

The former Italian premier bought a villa on Lake Como from his former business aide after years of reportedly house-hunting on the swank Alps-flanked lake. Though price is unknown, the manse has 30 rooms, a tennis court and a boat dock.

(E-pics / Splash News/Newscom)

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Dmitry Rybolovle... Purchased: $88 million penthouse
Location: 15 Central Park West, New York, NY
Time of Purchase: Officially closed February 2012

The ultra exclusive Central Park condo building welcomed the biggest home sale ever in New York when the Russian fertilizer king purchased the former Citigroup chariman's 7,000-square foot apartment for his 22 year-old daughter Ekaterina Rybolovlev while she reportedly attends university in the States. The pricey pad is currently the subject of a divorce-related lawsuit.

(AP)

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Paul Allen, wort... Purchased: $25 million penthouse
Location: East 66th Street, New York, NY Time of Purchase: October 2011

Listed For Sale: $13.5 million home
Location: Allan Island, Anacortes, WA

The Microsoft co-founder's new Upper East Side pied-a-terre sits next to an 18-room unit he already owns, signifying he will likely combine the two units. The limestone building remains ultra-exclusive and houses other rich residents like oil billionaire Sid Bass. Allen is also trying to unload a virtually undeveloped 292-acre private island off the coast of Seattle, which first listed for $25 million in 2005.

(Windmere Real Estate)

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Rinat Akhmetov, ... Purchased: Penthouse
Location: One Hyde Park, London, England
Sales Price: £136 million (roughly $221 million at time of purchase)
Time of Sale: April 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.

(Getty Images)

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Roustam Tariko Purchased: $25.5 million Star Island estate
Location: Miami
Time of Purchase: April 2011

The Russian vodka billionaire, reportedly a long-time renter of this 15,000-square foot abode, bought the nine-bedroom Star Island home for the largest sales price recorded since 2006. His neighbors include pharma billionaire Phillip Frost and celebrities like Rosie O'Donnell and Sean Combs.

(Courtesy of Trulia)

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Petra Ecclestone... Bought: The Manor - $85 billion
Location: Los Angeles
Time of Purchased: July 2011

Once America's most expensive home for sale (asking $150 million), the Manor has 56,500 square feet, and was purchased by the Formula One heiress. The humongous mansion has 56,500 square feet that includes everything from a beauty salon to a dog grooming room to a new underground private nightclub the new owner has requested.

(Zillow.com)

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Mark Pincus, wor... Sold: $8.2 million home
Location: 3855 Washington Street, San Francisco, CA
Time of Sale: March 2012

Recently Sold: $1.89 million home
Location: 1572 Shrader Street, San Francisco, CA
Time of Sale: January 2012

Last fall, the Zynga founder listed two San Francisco homes, one four-story Presidio Heights manse for $8.9 million and a second smaller Cole Valley house for $2.2 million. Less than half a year later both homes have sold for slightly prices than asking, the pricier one closing in early March.

(Courtesy of Trulia.com)

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Larry Ellison, w... Listed: $19 Million equestrian estate
Location: Turkey Farm Lane, Woodside, CA
First Listed: October 2011

Oracle's founder has long enjoyed a reputation as America's most prolific trophy home collector. Among his hundreds of millions of dollars worth of properties is this 6-plus-acre horse farm, which the tech titan is offloading. Recent real estate activities include purchasing a $43 million golf estate in Rancho Mirage, Calif. last year and currently, construction of a massive compound on the shores of Lake Tahoe.

(Trulia.com)

More From Forbes:
Inside Billionaire Alexander Rovt's $27 Million Man Cave
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America’s Richest Neighborhoods

The opinions expressed are solely those of the author and do not necessarily reflect the views of Comcast.
Hiroshi Mikitani... Purchased: $11.9 estate
Location: Million Britton Ave., Atherton, CA
Time of Purchase: September 2011

The online shopping mall founder snapped up a 6,212-square foot Valparaiso Park abode that was built in 2008. His new neighbors include fellow billionaires Meg Whitman, Charles Schwab and Eric Schmidt.

(Courtesy of Zillow)

More From Forbes:
Inside Billionaire Alexander Rovt's $27 Million Man Cave
America’s Most Amazing High-Rise Mansions
America’s Richest Neighborhoods

The opinions expressed are solely those of the author and do not necessarily reflect the views of Comcast.
More From Forbes Click here to see which neighborhoods have the most homes up for foreclosure.

The opinions expressed are solely those of the author and do not necessarily reflect the views of Comcast.