Elon Musk's last remaining home, a 47-acre Bay Area estate, hits the market for $37.5 million

• Elon Musk says he's selling his last remaining house.
• His Bay Area estate hit the market this week for $37.5 million.
• The 16,000-square-foot mansion sits on 47 acres and has a pool, hiking trails, and space for 11 cars.

Tesla and SpaceX billionaire Elon Musk has been shedding multimillion-dollar properties left and right over the last year. Now he's parting ways with what he says is his last remaining house.

In a Monday tweet, Musk announced the sale and called the Bay Area property a "special place" that he wants to sell to a large family. The property in question - a massive, century-old estate just south of San Francisco - popped up on Zillow around the same time.

Located in Hillsborough, California, the sprawling mansion has 16,000 square feet of interior space, roughly one-third the size of a football field. Perplexingly, it only has six bedrooms to match its 10 bathrooms, the Zillow listing says.

There's also a ballroom, banquet room, and a professional kitchen - all fancy things you'd expect from a home that's asking $37.5 million.

The 1916 mansion sits on 47 acres, complete with a pool, hiking trails, canyons, and a reservoir, according to the Zillow listing. There's room for 11 cars in a garage and carport. "Special" indeed.

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Musk bought the house in 2017 for just over $23 million from Christian de Guigne IV. Prior to Musk's purchase, the property had been in the aristocratic family for 150 years.

For Musk, getting rid of pricey real estate and Earthly possessions is all part of a grand plan for humanity to eventually colonize Mars, he told Insider in December. The SpaceX founder told Mathias Döpfner, the CEO of Insider's parent company, Axel Springer, that he wants to have as much capital available as possible for a mission to the red planet.

And lest you think a trip to Mars is too expensive for most people, Musk has said he intends for there to be "loans available for those who don't have money" and jobs on the red planet for colonists to pay off their debts. Some critics say Musk's plans resemble an interplanetary form of indentured servitude.