Stone Chateau in Northern N.J. Sells for US$17.7 Million, the State’s Biggest Home Sale in Three Years

A Versailles-style chateau in Alpine, New Jersey, has just been sold for US$17.7 million, the state’s highest home sale in the past three years.

The sale of the custom megamansion, which closed Tuesday, is also the highest-priced in the affluent town and in the Rio Vista neighbourhood since January 2022.

David and Mindy Kwon bought the vacant Bergen County land in 2011 for $3.95 million, according to records on Property Shark. They declined to comment on the sale.

The Kwons spent four years building their dream house, which they christened Chateau de la Roche for the boulder that had to be blasted out of the ground before the project could commence.

The interiors are by Denise Albanese, who, in her dual role as realtor associate at the Christie’s Mahwah-Saddle River Sales Gallery, also represented the Kwons in the sale.

“Among the luxury homes in Rio Vista, Chateau de la Roche is the cream of the crop,” she said. “It’s one of the most elegant—there’s a general feeling of grandeur and luxury.”

The seven-bedroom, 10.5-bath house, which was completed in 2017, is palatial enough to suit royalty.

The 25,700-square-foot house, which is about a half hour from Manhattan, has a 15-seat theatre, an elevator, a gas fireplace, a billiards room, two bars, a wine cellar, two indoor plunge pools, a sauna, a steam room, a conservatory and a central-vacuuming system.

Other features include a grand central staircase illuminated by a massive crystal chandelier, a great room warmed by a mammoth fireplace, a conservatory, a mezzanine and an ornately wood-panelled library with a fireplace. The garage can accommodate four vehicles.

On the left, palatial windows define the conservatory. While in the wood-panelled library, on the right, a fireplace adds atmosphere and warmth. David Heald Photography

Outside, there’s a resort-style swimming pool and a spa.

It’s the details, Albanese said, that set the chateau apart.

“It has soaring ceilings, custom fireplaces and bridal staircases,” she said. “In one of the powder rooms, there is glass-beaded wallpaper.”

Mansion Global could not immediately confirm the identity of the buyer, who was represented by Richard Orlando and Jason Pierce of Prominent Properties Sotheby’s International Realty and Taylor Lucyk of Christie’s International Real Estate Group

Albanese said that the Kwons, who own several other homes, are downsizing.

The transaction, she said, was a “full-circle moment for me as an interior designer and real estate agent. It’s a little sad to see the chateau go, but I’m already working with the sellers on their next interior design and real estate venture.”

Kwon is the corporate vice president and chief legal officer of ADP (Automatic Data Processing), a Roseland, New Jersey., company that provides human resources management software services. And he’s a trustee on the board of SEEDS, a New Jersey-based nonprofit that helps high-achieving students from low-income families.

Chateau de la Roche was originally put up for sale in 2021 for $25 million. Since 2023, the asking price has been $22.49 million.

A landmark beachfront home in Balgowlah Heights has sold for $17.5 million, setting a new residential record for the tightly held Northern Beaches suburb.

The six-bedroom residence at 30A Beatty Street changed hands on July 21 through Clarke & Humel Property, eclipsing its own previous benchmark by $5.7 million.

The property last sold for $11.8 million in October 2017, a result reported as a Balgowlah Heights record at the time. Its latest sale represents an increase of more than 48% in almost nine years and places it well ahead of other known sales in the suburb.

It is not the first time the address has reshaped local expectations. The home sold for $3.15 million in 2013 before extensive alterations and additions transformed it into the substantial trophy residence seen today. From that transaction to its latest sale, its recorded value has increased more than fivefold.

Occupying 1,074sqm in an exclusive no-through pocket, the property backs directly onto the golden sand of Forty Baskets Beach. A gate at the bottom of the garden opens to the beach and surrounding foreshore walks, creating the kind of direct harbour access rarely available on the Northern Beaches.

The home’s elevated, cascading design takes full advantage of its position. Walls of glass frame panoramic views across North Harbour, while a succession of indoor and outdoor living spaces follows the slope towards the water.

Arrival is suitably dramatic. The four-car garage—complete with harbour views—is connected to the residence by a lift. From there, a covered walkway leads through tropical gardens to an entrance framed by a koi pond, stone flooring and soaring ceilings.

At the centre of the home is an expansive living and entertaining level. A stone kitchen fitted with Miele appliances steps down towards the view, incorporating an integrated refrigerator and freezer and a built-in breakfast bar positioned to overlook the harbour.

The adjoining formal dining room opens through a bi-fold wall to a landscaped side courtyard. A substantial living room, anchored by a gas fireplace, also connects to the main terrace, creating a continuous relationship between the interior, gardens and water.

An electrically operated roof allows the terrace to be used in different weather conditions, while automated internal blinds and ducted airconditioning add to the home’s extensive technology and comfort features.

Outside, the entertaining areas continue around a swimming pool and spa. A built-in barbecue, steam room and generous terraces give the property the atmosphere of a private resort, with the beach only steps away.

The accommodation has been arranged to suit a large or multigenerational household.

Four bedroom suites occupy an upper level, while the main bedroom commands an entire floor. The private retreat includes sweeping harbour views, a large walk-in wardrobe and a luxurious ensuite.

On the lower level, a billiard room and bar are accompanied by two bedrooms and a bathroom. A separate self-contained studio provides further flexibility for extended family, guests or live-in staff.

The residence also includes a private home office, yoga room and extensive storage—features that allow it to function as both a secluded family home and a large-scale entertaining destination.

Sustainability and energy resilience have also been incorporated through solar panels and a Tesla battery.

Despite its rare waterfront setting, the property remains close to the conveniences of the lower Northern Beaches. Bus services are approximately 450 metres away, while Balgowlah Village, local schools and North Harbour Reserve are within easy reach. Manly is about three kilometres from the home.

The sale underlines the scarcity premium attached to Sydney homes combining substantial land, direct beach access and uninterrupted harbour views.

Balgowlah Heights has a median house value of about $4.23 million, according to PropTrack data displayed on realestate.com.au. At more than four times that figure, the Beatty Street result sits in a different tier from the suburb’s conventional prestige market.

Its price is also $6.65 million above the $10.85 million paid for neighbouring 30 Beatty Street in December 2025.

While conventional luxury features helped support the result, the defining asset is one that cannot be readily replicated: a private rear gate opening directly onto Forty Baskets Beach.

Stone Chateau in Northern N.J. Sells for US$17.7 Million, the State’s Biggest Home Sale in Three Years

The custom megamansion is located in the affluent town of Alpine, not far from New York City.