Billionaire Citadel founder and CEO Ken Griffin has reportedly expanded his enormous international property portfolio with the addition of a $38 million duplex apartment inside a storied New York City apartment building.
Griffin, 57, whose real estate holdings are believed to be worth upward of $1.5 billion, is said to have purchased the unit in an off-market deal, according to The Wall Street Journal, which reports that the property is located directly adjacent to a condo he already owned.
The property, which spreads across 7,500 square feet, including five bedrooms and 5.5 bathrooms, is located inside 740 Park Avenue, a building known for its incredibly wealthy and high-profile residents. Property records show that fashion designer Vera Wang owns a unit inside the co-op, as does billionaire hedge fund manager Israel Englander.
Indeed, Griffin’s new unit sits alongside the apartment that he purchased for $45 million from billionaire philanthropist Julia Koch—widow of billionaire businessman David Koch—in an off-market deal in 2025.
While the Citadel founder’s latest property is also understood to have been bought off market, a previous listing for the unit, which was first put on the market in September 2013, described it as being located in “one of the most sought after lines in the building.”
That listing also touted the unit’s incredible views and its “triple exposure,” courtesy of the 41 windows found throughout its many rooms.
At the time, the unit had three wood-burning fireplaces, 21 closets, a private elevator, a chef’s kitchen, a private library, and a formal dining room.
Other impressive features found in the space included original teak plank flooring, an original marble staircase, and original picture moldings and wainscoting.
The primary suite in the unit featured its own private sitting room, an enormous spa-like bathroom, and its own fireplace—as well as “multiple closets,” the listing noted.
There was also a separate guest wing, which housed two of the five bedrooms, as well as sizable staff quarters.
Between 2013 and February 2018, when it was eventually delisted, the property’s asking price was lowered significantly from a high of $29.5 million down to $22.5 million—a significant decrease from the price that Griffin is now said to have paid.
However, it is unclear whether the seller—whose identity is not known—made any upgrades to the unit in the years after it was removed from the market.
It is not known whether Griffin is planning to combine the new property with his existing unit in the building, or if he purchased the latest apartment as an investment opportunity.
The billionaire certainly isn’t lacking for housing options in the Big Apple, where he owns several dwellings—including an extraordinary penthouse that he bought for $238 million in 2019. That purchase remains the most expensive residential real estate trade in modern history.
His new unit is dwarfed by that record-breaking abode, which is located inside a glittering high-rise at 220 Central Park South, and which spans 24,000 square feet across four floors.
Not long after purchasing that impressive penthouse, Griffin added two additional units in the same building to his real estate collection for just under $4 million—bringing the total cost of his New York City portfolio alone to $325 million.
However, his collection of properties expands well beyond Manhattan.
When he wishes to escape the hustle and bustle of city life, he need only drive (or helicopter) a short distance to the Hamptons, where he owns a stunning $84.45 million compound.
Perhaps his most ambitious abode is his as-yet unfinished megamansion in Palm Beach, which is reportedly going to be worth a staggering $1 billion when completed. Should it achieve anywhere close to that valuation, it will be among the most expensive homes to have ever been built across the globe.
Set on a huge 27-acre parcel that Griffin spent several years amassing, it’s estimated that the home will cost anywhere between $150 million and $400 million to complete.
Located on South Ocean Boulevard in an area known as “Billionaires Row,” the dwelling will sprawl across a projected 50,000 square feet, and offer both ocean and lake views, as well as a spa, pool, and abundant gardens.
However, Griffin also owns several other Florida dwellings in nearby Miami, where he moved his Citadel headquarters to in 2022, having spent decades based in Chicago.
That same year, he snapped up two bayfront houses in Coconut Grove for $106.9 million, before also buying up multiple parcels of land on Star Island for a combined $169 million.
Griffin spokesperson Zia Ahmed later told the Journal that Griffin mostly purchases “one-of-a-kind properties and oceanfront lots that are inherently of limited supply and therefore likely to keep increasing in value,” noting that he also targets areas where he travels for work and that will serve as homes for him and his family for years to come.
To that end, the businessman also owns multiple other properties inside and outside the U.S., including a $122 million mansion in London; a $90 million beach escape in Saint-Tropez, France; and an enormous abode in Aspen, CO.