The Aporia · Wall Street titan lists bulletproof Upper East Side mansion for $80 million; property could become the neighbourhood’s priciest

John Mack, former CEO of Morgan Stanley, and his wife Christy are selling their Upper East Side mansion for $80 million, potentially making it New York City's most expensive townhouse ever sold. They purchased the landmarked limestone building in 2009 for $13.5 million and transformed it into a roughly 16,000-square-foot fortress with state-of-the-art security features, luxurious amenities like a private wellness club and screening room, and extensive living spaces. The Macks are retiring to North Carolina and listing the property through Mike Fabbri of The Agency.

Written by AI on 2026-10-14, from this article's own text only (the story summary below draws on all the coverage).

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The former Morgan Stanley CEO John Mack and his wife Christy have listed their Upper East Side townhouse in New York City for $80 million, making it the most expensive currently on sale. If sold at this price, it would surpass the previous record set by a 22,000-square-foot mansion that sold for $77.1 million in June 2019. The Macks bought the property in 2009 when Mack was CEO of Morgan Stanley for $13.5 million. They transformed the landmarked limestone building from a non-residential structure into a roughly 16,000-square-foot mansion with 20 rooms over six years, adding a floor and reinforcing it with steel beams. The original design by architect C.P.H. Gilbert dates back to 1902 for banker Henri P. Wertheim.

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In a following six-year gut job, the couple kept the landmarked limestone facade, added a floor and reinforced the guts with steel beams, transforming it into a roughly 16,000-square-foot mansion with 20 rooms.

framing: assertive · carried by 1 article(s) · first seen 2026-10-14

🔮 If sold at the listed price, the deal would break the city's townhouse record, previously set in June 2019 when 14 East 67th Street, a 22,000-square-foot mansion, was sold for $77.1 million.

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Wall Street titan lists bulletproof Upper East Side mansion for $80 million; property could become the neighbourhood’s priciest · assertive framing

Former Morgan Stanley CEO John Mack and his wife Christy have put their Upper East Side abode on the market for a whopping $80M, making it the most expensive townhouse currently on sale in New York City. asserted

it → put → City

If sold at the listed price, the deal would break the city's townhouse record, previously set in June 2019 when 14 East 67th Street, a 22,000-square-foot mansion, was sold for $77.1 million. asserted

Street → sell → million

The couple bought the abode in the form of a 33-foot-wide building that had never been a home at all. asserted

that → buy → building

Located at 165 East 70th Street, they scooped it up for $13.5 million in 2009, according to property records, back when Mack was a Wall Street giant, working at Morgan Stanley as the CEO. uncertain

Mack → locate → CEO

The building actually dates to 1902, when society architect C.P.H. Gilbert, the mind behind some of Fifth Avenue's grandest mansions, designed it for banker Henri P. Wertheim. asserted

Gilbert → date → Wertheim

couple → follow → rooms

The Macks had hunted for roughly a decade for a move-in-ready townhouse before settling on building their own, said listing agent Mike Fabbri of The Agency to The Post. asserted

Fabbri → hunt → Post

Now the couple is cashing out and retiring to North Carolina, where they both grew up. asserted

they → cash → Carolina

The home is a secured fortress. asserted

home → secure → ?

It has a state-of-the-art alarm system, dedicated security offices and even a bulletproof front door. asserted

It → have → system

A snowmelt system keeps the sidewalk clear in the winter. asserted

system → keep → winter

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

Fabbri → snow → snow

Inside, heat runs everywhere. asserted

heat → run → ?

“Not just the bedrooms and the baths, like every single floor is heated,” he said. asserted

he → heat → ?

The cellar works as a private wellness club with a hot tub, cold plunge, steam room, sauna and massage room. asserted

cellar → work → tub

Other highlights include a wood-panelled library, two soundproof offices, a full gym and private guest quarters with a full kitchen and a chef's kitchen with a walk-out dining terrace. asserted

highlights → include → terrace

There is also a private curb cut leading to a garage that doubles as a party space. asserted

that → be → space

“You’re usually giving up something to live in a townhouse,” Fabbri said. asserted

Fabbri → give → townhouse

“You’ve got it all in this house.” asserted

You → get → house

Previously, only five people have owned the site, according to Fabbri. uncertain

people → own → Fabbri

Singer sewing machine heir Stephen C. Clark used it as a garage and chauffeur's quarters while Paul and Bunny Mellon, used it as a private garage before selling it to the Macks. asserted

Mellon → use → Macks

“It’s completely turnkey, which is the magic word,” Fabbri said while highlighting that the new owner would not have to lift a finger to make the house comfortable and luxurious. asserted

house → ’ → finger

“It’s not just a showpiece, which it is. asserted

it → ’ → ?

It’s also somewhere that’s really functional.” asserted

that → ’ → ?

Wall Street titan lists bulletproof Upper East Side mansion for $80 million; property could become the neighbourhood’s priciest

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