The One Bel Air is a 105,000-square-foot megamansion said to be the biggest modern home in the US.

It's pending sale for $141 million, including fees and commission, following an auction - far from the $500 million its developer originally hoped to fetch.

There are five swimming pools, a 30-car garage, a 40-seat movie theater, beauty salon, four-lane bowling alley, glass-encased jogging track, 21 bedrooms, 42 full bathrooms and seven powder rooms. Designed by Irish architect Paul McClean and decorated by Kathryn Rotondi, the blindingly white contemporary structure was also built with a private nightclub, though that space is currently being repurposed into something else after loud opposition from other Bel Air neighbors.

For starters, the One has an enviable location-it's perched atop a lofty hilltop and enjoys 360-degree views of the bustling city below. "Imagine being the king of the hill and really standing on a property where you're looking down an entire city," Rayni Williams tells Robb Report, "And all the while you have a complete compound that encompasses everything you love and everything that's important to you."

It's true that the 21-bedroom property appeals to almost any hobby or interest. For the automotive enthusiast there's a 30-car garage on the subterranean level, complete with two turntables for showcasing your most bragworthy marques. If you're more of the fitness type, the third floor has its own gym and lap pool, plus a four-lane bowling alley, a hair salon and juice bar (great for post-workout smoothies and the like). Also on this level is the movie theater for cinephiles, the 10,000-bottle wine cellar for vino enthusiasts and the cigar lounge for those who'd rather just unwind with a stogie.

Meanwhile the primary bedroom alone is larger than most New York City apartments at 5,000 square feet, and has its own sitting room, massive his and hers closets and an office. And for visiting guests who'd prefer a separate building entirely, there's a 4,500-square-foot guest house on the grounds as well.

A set of infinity pools create a sort of moat that surrounds the main home, further adding to the "castle on a hill" vibe. But it's just one of many reasons you'll want to spend time outdoors here. The 10,000-square-foot roof deck, for instance, has spectacular views of the city-the mansion's elevator stops here, too, so you won't have to hoof it up the stairs.

Obviously the One makes for a great party pad, doubly so because it has its own in-house night club. "We call it the philanthropy wing because it's similar to something in the Pritzker Estate where they host thousands of people for charity events," says Rayni Williams.

Put all of the above together and the home makes a lot of sense for our current real estate landscape, when buyers want as many built-in amenities as possible-that way, even if another quarantine period were to occur, everything they need is already on site.

Still, a gargantuan home like this one wouldn't be everyone's cup of tea. "Obviously it's not for everybody," says Branden Williams. "But for the people it is for, it doesn't get better than this."

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