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The buoyancy in Central London’s ultra-prime residential property market continues apace with the latest mega-deal understood to be a Middle Eastern buyer who has purchased the famous £25,000,000 (asking price) Onassis residence at 47 Grosvenor Square in Mayfair.

It is understood that the deal, listed on Lonres at £18,600,000, is the highest price achieved for a single unmodernised apartment in Mayfair this year, brokered in less than 24 hours by leading Mayfair agent Wetherell, involving the head of the firm Executive Chairman Peter Wetherell. The last time a property deal in Mayfair for a home priced above £10,000,000 was agreed and implemented in less than 24 hours was over 10 years ago during the era before the introduction of Stamp Duty.

During the 1960s and 1970s the Onassis residence was used as a London pied-a-terre by Artemis Onassis, the sister of Aristotle Onassis, Christina Onassis, Artemis’s niece, Jackie Kennedy Onassis and Princess Lee Radziwill (Jackie’s sister). The interest in the property has been captivated by the glamorous history of the residence and also the potential to restore the property to its former glory; once restored it could be worth up to £30,000,000.

The Ambassadorial 1st floor apartment at 47 Grosvenor Square provides over 5,000 sqft of lateral living space with a 60+ foot balcony and south facing terrace. It was formerly the London home of Artemis Onassis, sister of billionaire Aristotle, and this deal is the first time in over 28 years that the historic Greek billionaire family’s Mayfair property has been brought to market and sold. 

The only apartment in the building with a balcony overlooking Grosvenor Square, the 1st floor apartment spans the prime central frontage of 47 Grosvenor Square, and extends almost the entire width and depth of the building, benefitting from a spacious south facing private terrace overlooking the rear façade.

The residence has three adjacent reception rooms, totaling over 60ft in length, all facing the square, complete with generous ceiling heights of 10.3 ft (3.15 m) with the accommodation including an impressive entrance hall, family kitchen, library, bar, guest powder room, five bedrooms, four ensuite bathrooms, guest bathroom, utility room and walk-in storage room.

The palatial neo-Georgian apartment building at 47 Grosvenor Square was built in 1938-1939 and the apartment’s first owner, from 1946, was Sir John Anderson, 1st Viscount Waverley (1882-1958) who was Chairman of the Royal Opera House and patron of legendry opera singer Maria Callas (1923-1977).

During the 1960s and 1970s the apartment served as the London home of Artemis Onassis (1902-1981), the sister of Aristotle Onassis, and her husband Theodore Garoufalidis (1898-1978), who was President of Olympic Airways, which between 1956 to 1974 was owned by Aristotle Onassis.

Guests at the apartment included Christina Onassis, Artemis’s niece, who owned a home in nearby Reeves Mews; other visitors included Jackie Kennedy Onassis, Princess Lee Radziwill (Jackie’s sister) and Jackie’s daughter Caroline Kennedy.

When approached, Wetherell declined to comment on the buyer or provide details of the deal. However, when asked about the deal being listed on Lonres Peter Wetherell conceded the following: Peter Wetherell, Founder & Chairman of Wetherell says: “The landmark sale of the Ambassadorial 5,000 sqft Onassis residence at 47 Grosvenor Square, in a £18.6 million deal done in under 24 hours, shows the continuing appeal by global wealth for trophy London properties. Ultra-high-net-worth buyers from around the world are currently wanting to acquire trophy properties of this type in Mayfair which will soon be in short supply. This is due to Westminster City Council’s new planning brief, which will prohibit the building of new homes of over £2,155 sqft (200 square metres). These planning changes mean that the pipeline supply of these type of large Ambassadorial residences will diminish over time.”

For further information contact Wetherell on 020 7529 5588.