NYCs richest woman, Julia Koch, is mystery buyer of $101M apartments

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Julia Koch is the mystery buyer of a pair of East Side co-ops that sold for $101 million last month, sources exclusively tell Page Six.

The properties were sold off by the estate of late Microsoft co-founder Paul Allen.

The apartments at 4 E. 66th St. include a penthouse and a full-floor unit beneath it. Allen had reportedly acquired the penthouse for a mere $25 million in 2011 after owning the apartment below it since 1996 when he paid $13.5 million for it.

Koch, 60, could not be reached for comment.

The billionaire, whose net worth has been reported to be as high at $70 billion by Bloomberg, has been on a bit of a property buying spree lately.

In late June, Page Six exclusively reported that the widow of David Koch also snapped up a historic Hamptons property nearby her own Southampton estate for below the asking price of $75 million.

An insider told us that Koch plans to restore the historic property but that any ideas are in the early stages, while another source said that the property could actually be a place for Koch’s three grown children and their families to stay.

Koch also has an $18 million mansion along what’s known as “Billionaire Lane” in Southampton, where residents have included Calvin Klein, Leon Black, Aby Rosen, Ian Schrager and Jay Sugarman.

Sources told Page Six that Koch recently hosted a costume party in the Hamptons and that there was buzz among the guests she was purchasing the East 66th Street pad from the Allen estate. The historic building has also been home to Veronica Hearst and Bernard Baruch, and its address is also known as 845 Fifth Ave.

The New York Times reported that the sale of the $101 million property was the largest so far in 2022 (not counting a duplex at 220 Central Park South that went for $188 million that was “finalized in late 2021 but not recorded until mid-January”).

But the private purchase was made via an LLC, so the buyer remained anonymous — until our scoop.

We’ve previously reported that Koch had star designer Peter Marino work on her $40 million Upper East Side townhouse that was purchased with her late husband, David, in 2018.

Koch married David in 1996 at his Southampton estate. The Koch Industries co-owner was also known as a powerful donor in conservative politics and for charitable spending, including giving $100 million to Lincoln Center in 2008 and tens of millions to the Smithsonian, American Museum of Natural History, the Metropolitan Museum and more.

He and his older brother, Charles, were behind the conservative group Americans for Prosperity and pumped hundreds of millions to back GOP pols at all levels.

David died at age 79 on Aug. 23, 2019.

The couple and their three kids were also once known to be among the most famed residents in the city’s most coveted address, 740 Park Avenue, in an 18-room duplex. According to the tome “740 Park: The Story of the World’s Richest Apartment Building,” David bought the pad from the Japanese government which used it to house its UN rep.

Julia reportedly put that apartment on the market this year for around $60 million since she was spending more time at the family’s Southampton and Palm Beach, Fla., residences. But it seems she’s now eyeing more time in the city with her latest buy.

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