An Ambassadorial 1st floor apartment at 47 Grosvenor Square providing 5,006 sqft (465.24 sqm) of lateral living space with a 63 foot balcony and south facing terrace, formerly the London home of Artemis Onassis, sister of billionaire Aristotle, is the finest residence and refurbishment opportunity in the world-renowned square and is being brought to market by sole agent Wetherell for the first time in 28 years.

One of the largest and grandest apartments in Grosvenor Square, the 1st floor five bedroom apartment at 47 Grosvenor Square has an illustrious history which combines aristocracy, wealth, glamour and celebrity.

The palatial brick and stone apartment building at 47 Grosvenor Square was built in 1938-1939 in a neo-Georgian style to designs by Detmar Blow, Estates Manager to the Duke of Westminster, and Fenand Billerey, the French Beaux-Arts architect. The internal fit out was disrupted by WWII so it was not until after 1945 that the building was fully completed, allowing residents to occupy the apartments.

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 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 63ft in length, all facing the square, complete with 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 apartment’s first owner was Sir John Anderson, 1st Viscount Waverley (1882-1958), who was Winston Churchill’s wartime Home Secretary and later Chancellor of the Exchequer. In 1946 Sir John moved into his new Grosvenor Square residence and in the same year took up his post-war roles as Chairman of the Port of London Authority and Chairman of the Royal Opera House.

It was Sir John who helped welcome legendry opera singer Maria Callas (1923-1977) to her first performance at the Royal Opera House in 1952 and he championed her following visits to the Covent Garden opera house in 1953, 1957 and 1958.

Maria Callas first met Greek billionaire Aristotle Onassis (1906-1975) in 1957 and the two started a famous love affair that continued for over 11 years. Given the links between opera patron Sir John, Callas and Onassis it is perhaps no coincidence that when Sir John’s Grosvenor Square residence became available the Onassis family acquired it.

During the 1960s and 1970s the Ambassadorial 1st floor apartment at 47 Grosvenor Square 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, the Greek national carrier which between 1956 to 1974 was owned by Aristotle Onassis.

Under Aristotle and Theodore Olympic Airways was given a luxury makeover with Pierre Cardin designed uniforms for the staff and gold cutlery and candelabra for first class passengers. On 21st October 1968 Aristotle Onassis married Jackie Kennedy with Artemis Onassis acted as her sponsor at the wedding.

Guests at the 1st floor apartment at 47 Grosvenor Square included Christina Onassis, Artemis’s niece, who owned a home in nearby Reeves Mews; other visitors included Jackie Kennedy Onassis and Princess Lee Radziwill (Jackie’s sister).

In 1975 Jackie’s daughter Caroline Kennedy was studying in London and staying at the Campden Hill Square home of MP Sir Hugh Fraser, a family friend, when an IRA bomb placed under Sir Hugh’s car exploded. Caroline was evacuated and stayed for several days at the apartment at 47 Grosvenor Square, the American Ambassador advising she would be safe based so close to the Embassy.

Fast forward to today and the apartment at 47 Grosvenor Square has been significantly modernised and altered since the days of Viscount Waverley and Artemis Onassis, however there are still features that serve as a reminder that the capacious living spaces once entertained Christina, Lee and and Jackie O.

Benefitting from a bright and airy ambience, the apartment has grand spacious rooms, floor-to-ceiling windows providing unparalleled views across Grosvenor Square and generous ceiling heights of 10.3 ft (3.15 m).

The large reception hall gives access to the 32ft main reception room, formal dining room and study, all opening onto the ornamental balcony overlooking Grosvenor Square. This trio provides approximately 2,000 sqft of reception space facing over the gardens of Grosvenor Square.

The library has full height glazing, with sliding doors opening onto the private terrace overlooking the south facing rear façade of the apartment building. The large family kitchen and breakfast room has a central island with breakfast bar, complete with a separate cocktail bar and utility room.

The size of a conventional apartment, the magnificent master bedroom suite has large His and Her walk-in dressing rooms and His and Her master bathrooms. There is also a principal guest suite with walk-in dressing room and ensuite bathroom. There are three further bedrooms, one with an ensuite and the others sharing a guest bathroom. The apartment building has a grand ground floor entrance foyer with two passenger lifts and 24 hour uniformed porterage.

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