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Grosvenor Square // is a large garden square in the exclusive Mayfair district of London, England. It is the centrepiece of the Mayfair property of the Duke of Westminster, and takes its name from their surname, "Grosvenor".
Sir Richard Grosvenor obtained a licence to develop Grosvenor Square and the surrounding streets in 1710, and development is believed to have commenced in around 1721. Grosvenor Square was one of the three or four most fashionable residential addresses in London from its construction until the Second World War, with numerous leading members of the aristocracy in residence.
The early houses were generally of five or seven bays, with basement, three main stories and an attic. Some attempt was made to produce impressive groupings of houses, and Colen Campbell produced a design for a palatial east side to the square featuring thirty Corinthian columns but this was not carried out and in the end most of the houses were built to individual designs. There were mews behind all four sides.
Many of the houses were rebuilt later in the 18th century or during the 19th century, generally acquiring an extra storey when this happened. Number 23 (later 26) was rebuilt in 1773–74 for the 11th Earl of Derby by Robert Adam, and is regarded as one of the architect's finest works and as a seminal example of how grandeur of effect and sophisticated planning might be achieved on a confined site. It was demolished and rebuilt again in the 1860s. Nearly all of the older houses were demolished during the 20th century and replaced with blocks of flats in a neo-Georgian style, hotels and embassies.
The central garden, which was originally reserved for the use of the occupants of the houses as was standard in a London square, is now a public park managed by The Royal Parks. At the eastern end of the garden there is a small memorial dedicated to the British victims of the September 11 attacks. The memorial includes an elliptical granite block engraved with the names of the victims and the poem For Katrina's Sun-Dial, by Henry van Dyke.
In the 1920s, four of the Bentley Boys - Woolf Barnato, Tim Birkin, Glen Kidston and Bernard Rubin - took adjacent flats in the fashionable south-east corner of the square, where their day-long parties became something of social legend. So common was the sight of their large, green sports cars parked ad hoc outside their flats, that for many years London cab drivers referred to the spot as "Bentley Corner".
American presence 
Grosvenor Square has been the traditional home of the official American presence in London since John Adams established the first American mission to the Court of St. James's in 1785. Adams lived, from 1785 to 1788, in the house which still stands on the corner of Brook and Duke Streets.
During the Second World War, Dwight D. Eisenhower established a military headquarters at 20 Grosvenor Square, and during this time the square was nicknamed "Eisenhower Platz". Until 2009, the United States Navy continued to use this building as its headquarters for United States Naval Forces Europe. A statue of Franklin D. Roosevelt, sculpted by Sir William Reid Dick, stands in the square, as does a later statue of Eisenhower, sculpted by Robert Lee Dean.
In 1960, a new United States Embassy was built on the western side of Grosvenor Square. This was a large and architecturally significant modern design by Eero Saarinen but at the time it was a controversial insertion into a mainly Georgian and neo-Georgian district of London. Since 2001, a series of anti-terrorist devices have been installed around the embassy, and the road running along the front of the embassy has been closed completely to traffic. In 2006, the Grosvenor Square Safety Group residents association took out advertisements in The Washington Post and The Times, accusing the Metropolitan Police and local governments of a "moral failure" for not closing two other roads adjacent to the embassy.
In 2008, the United States Government chose a site for a new embassy in the Nine Elms area of the London Borough of Wandsworth, south of the River Thames. Construction of the new Embassy of the United States in London is expected to begin in 2012 or 2013, with relocation completed by 2016 or 2017. The Grosvenor Square property has reportedly been purchased by the Qatari Diar investment group. In October, 2009, English Heritage granted Grade II listed status to the building. The listing means that the new owners will not be allowed to change the facade, which includes the 35-foot-wingspread gilded-aluminium eagle that hovers above the main entrance.
Adlai Stevenson 
On 14 July 1965, walking with Marietta Tree, then-U.S. Ambassador to the United Nations, Adlai Stevenson suffered a heart attack, later dying at St George's Hospital. His last words were reportedly "Do not walk quite so fast...and do hold your head up, Marietta."
Marietta Tree recounts: [After leaving the Embassy]
"We walked around the neighborhood a little bit and where his house had been where he had lived with his family at the end of the War, there was now an apartment house and he said that makes me feel so old. Indeed, the whole walk made him feel very not so much nostalgic but so much older. As we were walking along the street he said do not walk quite so fast and do hold your head up Marietta. I was burrowing ahead trying to get to the park as quickly as possible and then the next thing I knew, I turned around and I saw he'd gone white, gray really, and he fell and his hand brushed me as he fell and he hit the pavement with the most terrible crack and I thought he'd fractured his skull."
In popular culture 
- It appears in the title of several novels including The Lonely Lady of Grosvenor Square by Mrs. Henry De La Pasture (1907), The Grosvenor Square Goodbye by Francis Clifford (1978), and The House in Grosvenor Square by Linore Rose Burkard (2009).
- In Little Dorrit by Charles Dickens the Barnacles are said to live at "four Mews Street Grosvenor" which "was not absolutely Grosvenor Square itself but it was very near it".
- In the opening act in the play An Ideal Husband by Oscar Wilde, the first scene is in 'The octagon room at Sir Robert Chiltern’s house in Grosvenor Square.'
- It appears in the play The Importance of Being Earnest by Oscar Wilde when Lady Bracknell makes the comment about violence in Grosvenor Square because of the lower classes (or, depending on one's sense of humour, the upper classes) receiving education. This same comment is made in the 2003 film The Importance of Being Earnest by Lady Bracknell, who is played by actress Judi Dench.
- In Oscar Wilde's play Lady Windermere's Fan, the Duchess of Berwick says, "I think on the whole that Grosvenor Square would be a more healthy place to reside in. There are lots of vulgar people live in Grosvenor Square, but at any rate there are no horrid kangaroos crawling about."
- Alfred Sutro's one-act play A Marriage Has Been Arranged (1904) portraits a ball in "the Conservatory of No. 300 Grovesnor Square".
- Robert Hunter's lyrics for the Grateful Dead song Scarlet Begonias begin with the line "As I was walkin' 'round Grosvenor Square".
- Caroline Bingley makes a comment regarding the local dance in Pride and Prejudice "We are a long way from Grosvenor Square, are we not, Mr Darcy".
- It is used as a reference to the CIA's London office in the BBC spy drama Spooks.
See also 
- Video: Britain's Roosevelt Memorial at Grosvenor Square, 1946/11/28 (1946). Universal Newsreel. 1943. Retrieved February 20, 2012.
- Summerson, John (2003). Georgian London. Yale University Press. ISBN 978-0-300-08988-2.
- Gear Wheels: The online motoring magazine. "Bentley Boys". Retrieved 2007-02-13.
- Grosvenor Square at the Open Directory Project
- Introductory page from the Survey of London - the subsequent pages cover the past and present buildings in great detail.