Live in a WWII-Era U.S. Embassy in London for £21.5 Million

In the heart of London, a duplex apartment within the city’s former U.S. Embassy, which has been recently transformed into super-prime residences, has hit the market for £21.5 million (US$26.9 million).

The unit, which has been given the presidential moniker of the “Oval Residence,” is within No. 1 Grosvenor Square, and is the last sponsor unit available from developer Lodha UK. The building, on Mayfair’s uber-posh Grosvenor Square, served as the U.S. Embassy from 1938 until 1960, and then as the Canadian High Commission from 1962 until 2013. After being restored brick by brick, quite literally , it reopened as residences in 2022.

Some of the prominent figures of the 20th century have passed through its doors, including John F. Kennedy, who called it home when his father was appointed U.S. Ambassador to the U.K. in the 1930s, Winston Churchill and Eleanor Roosevelt, who was loaned an apartment when she visited London during World War II.

The three-bedroom home spans 4,400 square feet and was designed by Blandine de Navacelle, creative director of Studio Lodha, the developer’s interior design practice.

“No.1 Grosvenor Square is one of the capital’s most iconic addresses, and the design of the Oval Residence needed to reflect this,” de Navacelle said in a news release. “With large, open-plan living spaces and floor to ceiling windows, the residence offered the perfect backdrop for statement artwork and eclectic, sculptural furniture.”

The home also boasts a sleek kitchen, a home theatre, a dining area, wood-panelled walls, fireplaces and a 576-square-foot terrace.

“I regularly visit French galleries and furniture ateliers and am drawn to their art-centric approach to design and interiors,” de Navacelle said. “I wanted to bring a touch of this Parisian eclecticism to No.1 Grosvenor Square, creating a sophisticated and elegant private residence that blends both the classic and the contemporary.”

The turn-key flat is being sold with all of its furnishings.

Future occupants will also have access to the building’s amenities, including an in-house concierge team, a private health club and spa, a pool and a cinema.

Grosvenor Square has been one of London’s most-famed addresses for centuries. Currently in the middle of a dramatic remaking, No.1 Grosvenor Square is just one the enclave’s storied buildings to be undergoing, or to have undergone, a complete transformation.

The former U.S. Naval Building at No. 20, has been transformed into the first solely residential project from the Four Seasons, and the iconic Eero Saarinen-designed U.S. Embassy that spans the entire western side of the square, is set to become the Chancery Rosewood hotel by 2025.

London has no shortage of diplomatic buildings that have been transformed into luxury homes. In February, and for the first time in more than a century, the former Italian Embassy, now a lavish mansion, hit the market for £21.5 million . The former Cypriot Embassy, meanwhile, sold in March for £25 million to a buyer seeking a grand family home in the city.

The typically busy spring season for the housing market was a dud, and the summer isn’t looking much brighter.

Housing services companies like Zillow Group and Rocket RKT +3.78% were loud and clear last week on earnings calls: Rocket CEO Varun Krishna called the quarter through June “one of the toughest spring housing markets in years.”

Jeremy Hofmann, Zillow’s chief financial officer, said on a conference call that the company predicted earlier this year that the market for mortgages would be flat. “We actually now think it’s going to be down low-to-mid-single digits,” he said.

The rest of 2026 will remain challenging for mortgage origination volume, says KBW analyst Bose George. The question now is what happens in 2027. “If mortgage rates remain [around] 6.75%, I think that’s going to be challenging even for next year,” he says.

But what’s bad news for mortgage companies could be a positive for bargain hunters. Buyers can expect prices to grow more slowly—or mildly decline—with less competition as long as mortgage rates remain unpredictable.

Mortgage rates at the beginning of the year were solidly below year-ago levels, notes Zillow senior economist Kara Ng. But they surpassed last year’s levels recently, she adds, referencing Freddie Mac’s weekly survey of 30-year fixed mortgage rates. Last week’s reading, at 6.69%, was higher than year-ago levels for the first time in 2026.

“From the affordability point of view, it’s going to get more challenging in the second half of the year,” she says. “And when affordability gets more challenging, that impacts sales and home price appreciation.”

Mortgage application data tracked by the Mortgage Bankers Association has cooled since the beginning of the year. The trade group expects that the number of mortgage originations in the remaining two quarters will lag behind last year’s levels, after exceeding 2025 levels in the first half.

Rocket’s early-stage data—which the company told Barron’s it derives from its brokerage Redfin, demand for its mortgage products, and signs in its servicing portfolio that a homeowner is preparing to refinance or move—“leads us to expect the third quarter mortgage market to be smaller than the second,” Chief Financial Officer Brian Brown, said on the company’s call. He added that such an occurrence is “something the industry has not seen since 2022.”

Prices will be about flat nationally, Ng says. Zillow’s most recent forecast, which shows how values are expected to change in the year ending June 2027, show them dropping in roughly half of the 100 largest U.S. metros for which data is available.

Buyers aren’t rushing in at a time when mortgage costs are rising and unpredictable. But those with the right combination of patience and cash could stand to benefit. “If you are financially qualified to buy a starter home, you are facing less competition and you’re more likely to get a price cut,” Ng says.

Live in a WWII-Era U.S. Embassy in London for £21.5 Million

The three-bedroom, duplex apartment in the notable Mayfair building spans 4,400 square feet