There’s a New Menace Stalking Suburbia. Meet the McBasement.

When Sterling McDavid’s parents bought a roughly 9,000-square-foot home on Aspen’s Red Mountain, the 33-year-old interior designer directed the architect and contractors to start digging.

Limited by zoning above ground, Ms. McDavid, who led the renovation, envisioned an expansive basement with a world-class gym, guest suites and hotel-caliber spa for her parents, former college track star Stacie McDavid, and David McDavid, a former owner of the Dallas Mavericks and car-dealership mogul.

“I love a basement,” says Ms. McDavid, who ultimately blew out her parents’ basement to more than double its size. “When you walk into a home, if all the magic is just within the first few steps, that’s no fun.”

Wealthy Londoners have long built basements reaching two, three, and even four stories below ground. Now, there is a cellars market in the U.S. among property owners facing restrictions on mansion sizes above ground. The McBasements of today have bars, bowling alleys, pools, climbing walls and whiskey-tasting rooms. To sidestep subterranean gloom, builders usher in natural light via grand staircases or skylights cut into the ground above.

“Down is the new up,” says Randy Correll, partner at Robert A.M. Stern Architects, who designs basements with luxe finishes. “Twenty years ago, basements were the ‘B word.’”

Ms. McDavid says the excavation for her parent’s 4,000-square-foot Aspen basement added about a year to the three-year renovation, since workers dug underneath the home and into a mountainside. The resulting basement has guest suites, a gym with white oak floors, a 12-person hot tub and an “absurdly large” steam room, she says. “You feel like you’re in a luxury cave.”

She says the prior owner, by contrast, had done little to maximise the basement, which was “absolutely heinous.” (“It had wine storage, not to be confused with a wine cellar,” she says.)

Still, some towns have cracked down on the chic crypts, worried about unsettling topography and having truckloads of excavated dirt roll through residential streets. In Aspen, a resident sued the city for permitting a neighbour’s two-story basement, alleging excessive noise and dust. Aspen now limits basements to one level. And the Beverly Hills Planning Commission is now mired in a down-and-dirty basement brouhaha.

The island of Nantucket, just 14 miles long and 3.5 miles wide, limits home sizes with more than 20 zoning districts. Some areas allow a footprint covering only 2 percent of the property.

One solution? Go low. “The possibilities are endless,” says Stephen Cheney, owner of Cheney Custom Homes, who is currently constructing a roughly 16,000-square-foot home and guest home with a 5,600-square-foot “bunker” below for a bowling alley, 3-D golf simulator, and spa.

Basements can dwarf homes above. Designer Andrew Kotchen, a principal at Workshop/APD, is working on a 5,000-square-foot Nantucket abode that will have a 10,000-square-foot basement with a basketball court, garage, bedrooms and a wellness space.

In beach towns, architects are deploying extreme waterproofing measures.

For the 10,000-square-foot grotto, workers are using the same waterproofing technique as Boston’s Big Dig highway project, Mr. Kotchen says. An emergency pump system and thick concrete slab underneath will prevent the foundation from floating up should water levels rise, he says.

In Aspen, a 5,000-square-foot basement at the confluence of two rivers required “dewatering,” says Ryan Walterscheid, a partner at architecture firm Forum Phi. Workers drilled wells around the site and pumped out almost a billion gallons of water before pouring the foundation. (The water was poured back into the river.)

Architect Charles Cunniffe, who designed the McDavids’ remodel, also did a basement with a tennis court. “You can’t hit big lob shots,” he says, “but you can play a decent game of tennis.”

Interior designer Bryan Graybill says a large basement at his home in East Hampton, N.Y., was the only way to fit all the amenities he and his husband desired in their 4,100-square-foot house. For frequent hosting, their 1,800-square-foot lower level has full guest quarters, a laundry room with three sets of washers and dryers, and a catering pantry with extra stemware and service for 48. “It’s like an instant party,” he says.

Beverly Hills residents are also keeping up, and down, with the neighbours.

Architect Paul McClean crafted a house there with 7,400 square feet above ground and another 12,000 below, including a 3,000-square-foot garage. The firm also designed developer Nile Niami’s roughly 105,000-square-foot Los Angeles megamansion “The One,” where about half the home sat below grade. First listed at $500 million, the property fetched $126 million at auction this year. (A relative bargain-basement deal.)

Beverly Hills leaders passed ordinances in recent years in response to what Craig Corman, former Planning Commission chairman, called a “pernicious” trend of mammoth dwellings with wedding cake-style retaining walls and massive basements. “They can be quite offensive,” he said during a recent commission meeting. Now, property owners in the Hillside area cannot remove more than 3,000 cubic yards of earth without special permits.

This has hampered real-estate investor David Taban, who is trying to build a 23,144-square-foot house, of which 9,829 would be a basement. (He wants to dig down to appease neighbours who worried his home would hurt their views.) But getting a basement of that size required removing 5,346 cubic yards of dirt, which one city planner said would amount to 594 truckloads.

“Violence to the land,” Planning Commission Chair Myra Demeter dubbed it at an August meeting.

Asked to revise, Mr. Taban’s team is set to return to the commission Thursday. As of late September, plans called for removing just 3,276 cubic yards of soil, according to attorney Ronald Richards, a representative for Mr. Taban, who also argued the project should be permitted since the proposal predates some restrictive rules.

“It’s not even that crazy of a project in our mind,” says Russell Linch, another Taban representative.

Spec developers know the more liveable space, the bigger the price tag, says Brett Loehmann, a project manager at McClean Design. “If you don’t have great amenities, you’re not going to be the coolest person on the block.”

Elon Musk Sells Gene Wilder’s Former Home Back To The Late Actor’s Family

Jordan Walker-Pearlman was heartbroken when he was told, erroneously, that the house where he grew up with his uncle, the late actor Gene Wilder, had been demolished.

He still had vivid memories—sometimes even dreams—of Mr. Wilder’s morning swims in the kidney-shaped pool, the Sunday after-tennis hangouts with the likes of Mel Brooks and Sidney Poitier, raucous dinner parties, and listening to Mr. Wilder read scripts and play piano while he nursed a Lillet cassis cocktail.

The low-slung, white-shingled house, in the Bel-Air neighbourhood of Los Angeles, was also where actress, comedian and “Saturday Night Live” cast member Gilda Radner died from ovarian cancer in 1989. Mr. Walker-Pearlman considered her a second mother after she married Mr. Wilder in 1984.

“I mourned the house,” says Mr. Walker-Pearlman, a 53-year-old film director and writer, who directed the 2000 film “The Visit” and whose wild hair and prominent, expressive eyes are similar to those of his late uncle, known for his work in “Willy Wonka & the Chocolate Factory” and “Blazing Saddles.” From an early age, Mr. Walker-Pearlman split his time between living with Mr. Wilder, and living with his grandmother in Harlem. His biological parents, he says, were “a little crazy and not enthusiastic about the responsibilities of child rearing.”

Then one day, when he was in the neighbourhood, Mr. Walker-Pearlman drove by to show his wife, screenwriter Elizabeth Hunter, where the house had been. He was shocked to find it still standing. Owned by tech billionaire Elon Musk, there was a large party under way, but the security guard opened the gate so they could peek in.

About a year later, a friend sent him a screenshot of Mr. Musk’s now-famous May 1, 2020, texts:

“I am selling almost all physical possessions. Will own no house” and “Just one stipulation on sale: I own Gene Wilder’s old house: It cannot be torn down or lose any of its soul.”

A US$9.5 million listing appeared on forsalebyowner.com, advertised as the “former home of Gene Wilder/Willy Wonka,” “upgraded with modern amenities, but preserved original charming and quirky vibe.” The listing stipulated that the home was being sold with the condition that it must be preserved.

Mr. Walker-Pearlman said he reached out to Mr. Musk’s team immediately. He knew he couldn’t afford that price, but the tweet gave him optimism they might reach a deal. “The only person who could possibly want it not to be torn down as much as him was me,” he says. Mr. Musk didn’t respond to a request for comment.

After four months of negotiations, Mr. Walker-Pearlman says Mr. Musk agreed to sell the house to him and Ms. Hunter for US$7 million along with what’s called a “long form deed of trust and assignment of rents,” in which Mr. Musk agreed to lend the couple $6.7 million, according to public documents.

“He could have sold it for so much more,” says Mr. Walker-Pearlman. “His sensitivity to me can’t be overstated.”

The sale closed in October 2020. The timing for Mr. Walker-Pearlman was exquisite, because it allowed him to use the house as the set for his upcoming film “The Requiem Boogie,” produced by his production company, Harlem, Hollywood. The somewhat autobiographical plot follows a middle-aged former child actor, played by Mr. Walker-Pearlman, who is mourning the loss of his movie-star father. It is a spiritual, quasi-comedy about dealing with Mr. Wilder’s death and the nature of show business, says Mr. Walker-Pearlman.

Living in the house again has been both wonderful and spooky, says Mr. Walker-Pearlman. He feels the ghosts of the people who made it come alive. When he walks into a certain room, a memory will pop up and he will get teleported back, he says. At times he even feels like messages from beyond are being sent, such as when the crew was filming in what was Ms. Radner’s dressing room and suddenly the water in the shower and sink came on.

When he and Ms. Hunter were signing the papers for the loan from Mr. Musk, a buck they had never seen before appeared from the hedges and stood in the window, staring at them, hanging around for nine hours that day; they haven’t seen it since. The couple’s 3-year-old nephew, Hunter, has told him there are ghosts in the house, he says.

The house came with many of Mr. Musk’s furnishings, including a purple sofa, a drawing of a clown, a large chess set and a swing encased in a giant metal birdcage in the backyard, which Mr. Walker-Pearlman says was a party gift to Mr. Musk.

Mr. Walker-Pearlman says he believes Mr. Musk originally bought the property to protect the distant views of Los Angeles and the Pacific Ocean from his primary house across the street, which Mr. Musk sold for $29.72 million to Chinese billionaire William Ding in June 2020, according to public records. He says he believes Mr. Musk used the garage as a school for his children at one point and the main house to hold parties. Mr. Musk didn’t respond to a request for comment.

Some things have changed since Mr. Wilder owned it: There used to be white shag carpet in the living room (a recommendation to his uncle from the late actor Burt Reynolds, says Mr. Walker-Pearlman); the main bathroom had a bath. Mr. Wilder’s much-used piano and a dart board are gone. The ceiling is now painted with black and white stripes and trees no longer block the view of the Bel-Air Country Club’s golf course below.

But much is the same. Mr. Walker-Pearlman still uses the indoor grill in the dining room where he says Mr. Wilder loved to cook chicken three times a week. He sits at the small kitchen desk, where he says Mr. Wilder would eat his morning bran muffins and drink Earl Grey tea. And he swims in the same pool where Mr. Wilder would do morning laps and where he taught Mr. Walker-Pearlman how to swim. Almost every wall and shelf contains memorabilia, including photographs of Mr. Wilder playing tennis, dressed as Willy Wonka.

Mr. Wilder, who was born Jerome Silberman, bought the 2,800-square-foot, five-bedroom, five-bathroom house in Bel-Air for around $300,000 in 1976, buoyed by the success of the 1974 film “Young Frankenstein,” in which he starred.

Mr. Walker-Pearlman had been living part time in Harlem with his grandmother, and part time with Mr. Wilder, who was his mother’s brother. He soon started spending all summer and time during a few other months in Los Angeles.

In L.A., Mr. Wilder gave him an education rich in the history of film, moviemaking and acting. He says he learned to process the world in terms of film, being hyper-aware of lighting and constantly wanting to change people’s dialogue. He started acting as a child and made and starred in his own film for Nickelodeon as a teenager. He also learned a lot about French red wines and the importance of romance, he says. “I didn’t leave his side.”

Ms. Radner urged Mr. Walker-Pearlman to try college, so he attended George Washington University and Howard University for stints. But she was also upset when he said he didn’t want to pursue an acting career. He says she told him “this house is for crazy people. You have to become one of us.”

The result was a mixed relationship with film. He says he learned to hate what he sees as the commodification and narcissism of the film industry, but he loved being in the editing suites and on set, especially during the filming of “Hanky Panky” in 1981, directed by Mr. Poitier, when Mr. Wilder and Ms. Radner met as co-stars.

In 1991, two years after Ms. Radner died, Mr. Wilder married his fourth wife, the former Karen Boyer. They eventually moved permanently to Ms. Radner’s former farmhouse in Stamford, Conn., where Mr. Wilder had been living much of the time after Ms. Radner’s death. He sold the Bel-Air house in 2007 for $2.7 million to Bristol Capital LLC. Mr. Musk bought it in 2013 for $6.75 million, according to PropertyShark.

Mr. Walker-Pearlman says he’s still mourning his uncle, who died in 2016 at age 83, and Ms. Radner. Living and filming in the house has triggered a range of emotions. “It’s the closest you can get to going back to the past,” he says. He worries that his wife pays a toll for that.

But Ms. Hunter says she’s thrilled to get the chance to live in such a beautiful house in a neighbourhood she never thought she would be able to afford. “It’s magic,” she says.