Bill Gates added a $43 million beachfront home to his sprawling real estate portfolio last year. Here's a closer look at his empire, which also includes a $130 million Washington mansion and horse ranches in Florida.

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Gates spends most of his time at his 66,000-square-foot mansion in Medina, Washington. It took Gates seven years and $63 million to build this behemoth of a house, which is filled with lots of high-tech features. He purchased the lot for $2 million in 1988, but the property is now worth an estimated $130 million.

Inside, a high-tech sensor system helps guests monitor a room's climate and lighting. There's also a trampoline room, a 60-foot swimming pool, six kitchens, and a dining hall that can accommodate up to 200 people. The house even has its own name: Xanadu 2.0, after the home in "Citizen Kane."

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In October 2014, Gates purchased the 228-acre Rancho Paseana for $18 million. The property includes a racetrack, guesthouse, office, veterinarian's suite, orchard, and five barns. Weight-loss expert Jenny Craig previously owned the property before selling it to Gates.

Gates also owns another horse farm in Wellington, Florida, which he purchased for $8.7 million in 2013. The Gateses' daughter, Jennifer, is an avid equestrian, and they had previously rented the house when in Florida for her competitions.

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In 2009, Gates reportedly purchased a Wyoming ranch that once belonged to Buffalo Bill Cody. Though the price he paid for the 492-acre property was never reported, it was originally listed for $8.9 million.

Gates has made a number of real estate investments through his personal investment firm, Cascade. That includes a partial ownership of the posh Charles Hotel in Cambridge, Massachusetts.

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Gates owns nearly half of the Four Seasons hotel chain through Cascade, including hotels in Atlanta and Houston. Gates shares 95% ownership with Prince al-Waleed bin Talal of Saudi Arabia, according to a Wall Street Journal report from 2017.

In 2013, Gates and several unnamed buyers paid $161 million for the Ritz-Carlton in San Francisco, according to The Journal.

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In 2014, Cascade was linked to the purchase of more than 4,500 acres of farmland in Suwanee County, Florida, near the community of McAlpin. A subsidiary of Cascade paid nearly $28 million for the tract of land.

As of 2021, Gates has become the largest private-farmland owner in the US. He currently owns 242,000 acres of farmland, and the largest holdings are in Louisiana, Arkansas, and Nebraska, according to an analysis by The Land Report.

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Last spring, Gates purchased a $43 million oceanfront beach house in San Diego. The 5,800 square foot home includes six bedrooms, a pool, a 10-person Jacuzzi, and a fire pit.