Wall Street titan offers bulletproof Upper East Side mansion for $80 million, in what could become most expensive

Talk about power.

Former Morgan Stanley honcho John Mack and his wife, Christy, have put their converted Upper East Side carriage house on the market for a staggering $80 million, making it the most expensive townhouse currently for sale in New York.

If a buyer pays, the deal would shatter the borough’s townhouse record, set in June 2019 when 14 East 67th Street, a 22,000-square-foot mansion, traded for $77.1 million.

“If this listing ends up selling for $80 million, it would be the highest townhouse sale ever in Manhattan,” appraiser Jonathan Miller of Miller Samuel told the Post.

“If there’s any house that deserves this record, it’s this one,” listing agent Mike Fabbri of The Agency told the Post.

Former Morgan Stanley chief John Mack and his wife, Christy, have listed their converted Upper East Side carriage house at 165 East 70th Street for $80 million. Francisco Rosario/DD-Reps
This asking price currently makes it the most expensive townhouse on the New York market. Francisco Rosario/DD-Reps
If it sells for that figure, it would surpass the $77.1 million record for Manhattan townhouses, set in June 2019 by 14 East 67th Street, according to appraiser Jonathan Miller of Miller Samuel. Francisco Rosario/DD-Reps
The couple purchased the 33-foot-wide building for $13.5 million in 2009 when it was a distressed property that served only as a garage. Francisco Rosario/DD-Reps
Over six years, under Christy’s direction, they preserved the limestone facade, added a floor, and reinforced the structure with steel to create a home of approximately 16,000 square feet and 20 rooms. Francisco Rosario/DD-Reps

The Macks acquired 165 East 70th Street for $13.5 million in 2009, real estate records show, when John was still running the Wall Street giant. At the time, the 33-foot-wide building had never been a house.

“It was a distressed property,” Fabbri said. “It’s always been used as a garage.”

What followed was six years of instinctive work, with Christy leading the design, according to Fabbri. The couple kept the limestone facade, added a floor and reinforced the innards with steel beams, transforming the stable into a mansion of approximately 16,000 square feet with 20 rooms.

“It took our client six years to realize this and build this,” Fabbri said.

The Macks had been looking for a move-in ready townhouse for about a decade before deciding to build their own, he said. Now the couple is cashing out and retiring to North Carolina, where both grew up.

The finished mansion features a bulletproof front door, dedicated security offices, heated floors throughout and a snow melting system that clears the sidewalk out front. Francisco Rosario/DD-Reps
Its cellar functions as a private spa with hot tub, cold bath, hammam, sauna and massage room, as well as a gym, a 13-seat theater and a wine cellar containing 6,319 bottles. Francisco Rosario/DD-Reps
Other perks include two elevators, six wood-burning fireplaces, three decks, and a rare private curb leading to a garage that doubles as an entertainment space. Francisco Rosario/DD-Reps
The building was designed in 1902 by architect CPH Gilbert for banker Henri P. Wertheim and was later owned by Singer heir Stephen C. Clark and Paul and Bunny Mellon (pictured). Penske Media via Getty Images
The renovation reused relics from the stables’ days, transforming old chestnut horse ramps into paneling for the gym. Francisco Rosario/DD-Reps
Listing agent Mike Fabbri of The Agency is listing the home as completely move-in ready, a rarity among Manhattan townhouses. Francisco Rosario/DD-Reps

John, who led Morgan Stanley as CEO during the 2008 financial crisis, stepped down as chairman in 2011.

Security has been built in from the start, with a bulletproof front door, state-of-the-art alarm system and dedicated security offices.

“I think everything was thought of in this house, even safety and security,” Fabbri said, adding that the house was “built like a fortress.”

Creature comforts are just as serious. A snow melting system keeps the sidewalk clear in winter.

“So when it snows outside, the sidewalk in front of the house melts the snow,” Fabbri said.

Inside, radiant heat circulates everywhere. “Not just the bedrooms and bathrooms, because every floor is heated,” he said. The HVAC was replaced this year.

The Macks (pictured) are now retiring to North Carolina, where they are both from, and Fabbri is confident the house can achieve its record price. MovieMagic
A study. Francisco Rosario/DD-Reps
The grand staircase. Francisco Rosario/DD-Reps
The dining room. Francisco Rosario/DD-Reps
A formal living room. Francisco Rosario/DD-Reps
A living space. Francisco Rosario/DD-Reps

The winery functions as a private health club with a hot tub, cold pool, hammam, sauna and massage room. There’s a 13-seat screening room, a 6,319-bottle wine cellar, two elevators (one high-speed), six wood-burning fireplaces and three landscaped terraces, including a 480-square-foot rooftop perch.

Then there’s Manhattan’s rarest luxury, a private curb leading to a garage that doubles as a party space.

“You usually give up something to live in a townhouse,” Fabbri said. “You have everything in this house.”

The building dates to 1902, when architect CPH Gilbert, the talent behind some of Fifth Avenue’s grandest homes, designed it for banker Henri P. Wertheim.

“It’s not like you can recreate a CPH Gilbert house,” Fabbri said.

The soundproofed theater with 13 seats. Francisco Rosario/DD-Reps
The gym. Francisco Rosario/DD-Reps
One of 13 bathrooms. Francisco Rosario/DD-Reps
One of six bedrooms. Francisco Rosario/DD-Reps
A large corridor. Francisco Rosario/DD-Reps
The outdoors. Francisco Rosario/DD-Reps

Only five owners have held the keys for more than a century, according to Fabbri. The list includes Singer sewing machine heir Stephen C. Clark and Paul and Bunny Mellon, who used it as a private garage before selling it to the Macks.

Rather than erasing the building’s cart past, the renovation integrated it directly into the design. The old railings, scarred by decades of hooves, turned out to be virgin chestnut slabs. They now wrap the lower level gym in the form of paneling.

For Fabbri, the real selling point is that the next owner won’t have to lift a finger.

“It’s completely turnkey, that’s the magic word,” he said. “It’s not just a showpiece, as it is. It’s also a really functional place.”

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