Question: On which street in Mayfair, London is the Apple Corps office of the Beatles? 

Context articles: Apple Corps
Apple Boutique
Derek Taylor
Apple Corps v Apple Computer
The Longest Cocktail Party
Savile Row
The Beatles' rooftop concert
Run of the Mill (George Harrison song)
Alistair Taylor
Apple Records

Apple Corps Ltd (informally known as Apple) is a multi-armed multimedia corporation founded in London in January 1968 by the members of the Beatles to replace their earlier company (Beatles Ltd) and to form a conglomerate.
 Its name (pronounced "apple core") is a pun.
 Its chief division is Apple Records, which was launched in the same year.
 Other divisions included Apple Electronics, Apple Films, Apple Publishing and Apple Retail, whose most notable venture was the ill-fated Apple Boutique, on the corner of Baker Street and Paddington Street in central London.
 Apple's headquarters in the late 1960s was at the upper floors of 94 Baker Street, after that at 95 Wigmore Street, and subsequently at 3 Savile Row.
 The latter address was also known as the Apple Building, which was home to the Apple Studio.
The Apple shop was a retail store located in a building on the corner of Baker Street and Paddington Street, Marylebone, London.
 It opened on 7 December 1967 and closed on 31 July 1968.
 The shop was one of the first business ventures by The Beatles' fledgling Apple Corps.
Derek Taylor (7 May 1932 – 8 September 1997) was an English journalist, writer, publicist and record producer.
 He is best known for his role as press officer to the Beatles, for whom he became one of several associates to earn the moniker "the Fifth Beatle".
 Before returning to London in 1968 to head the publicity for the Beatles' Apple Corps organisation, he worked as the publicist for California-based bands such as the Byrds, the Beach Boys and the Mamas and the Papas.
 Taylor was known for his forward-thinking and extravagant promotional campaigns, exemplified in taglines such as "The Beatles Are Coming" and "Brian Wilson Is a Genius".
 He was equally dedicated to the 1967 Summer of Love ethos and helped stage that year's Monterey Pop Festival.
Between 1978 and 2006 there were a number of legal disputes between Apple Corps (owned by The Beatles) and the computer manufacturer Apple Computer (now Apple Inc.) over competing trademark rights.
 The High Court of Justice handed down a judgment on 8 May 2006 in favour of Apple Computer, but the companies did not announce a final settlement until 5 February 2007.
The Longest Cocktail Party: An Insider's Diary of the Beatles, Their Million-dollar Apple Empire and Its Wild Rise and Fall (ISBN  ) is a rock history book by Richard DiLello, published in 1973 by Playboy Press, and reprinted in 1981 and 2005.
 "The Longest Cocktail Party" is one man's account of the history of the Beatles' company Apple Corps, the break-up of the Beatles, and the beginning of their solo careers.
 The title is a reference to the press office's habit of entertaining members of the media, and the company's potential business partners, with expensive drinks, luncheons and perks – which ultimately led to a financial and spiritual hangover, as did the unrealised potential of the company.
Savile Row (pronounced ) is a street in Mayfair, central London.
 Known principally for its traditional bespoke tailoring for men, the street has had a varied history that has included accommodating the headquarters of the Royal Geographical Society at 1 Savile Row, where significant British explorations to Africa and the South Pole were planned; and more recently, the Apple office of the Beatles at 3 Savile Row, where the band's final live performance was held on the roof of the building.
The Beatles' rooftop concert was the final public performance of the English rock band the Beatles.
 On 30 January 1969, the band, with keyboardist Billy Preston, surprised a central London office and fashion district with an impromptu concert from the roof of the headquarters of the band's multimedia corporation Apple Corps at 3 Savile Row.
 In a 42-minute set, the Beatles were heard playing nine takes of five songs before the Metropolitan Police Service asked them to reduce the volume.
 Footage from the performance was later used in the 1970 documentary film "Let It Be".
"Run of the Mill" is a song by English musician George Harrison, released on his 1970 triple album "All Things Must Pass".
 Harrison wrote the song shortly after the Beatles' troubled "Get Back" sessions in early 1969, during a period when his growth as a songwriter had inadvertently contributed to the dysfunction within the Beatles' group dynamic.
 The lyrics reflect the toll that running their company Apple Corps had taken on relationships within the band, especially between Paul McCartney and the other three Beatles, as well as Harrison's dismay at John Lennon's emotional withdrawal from the band.
 Commentators recognise "Run of the Mill" as one of several Harrison compositions that provide an insight into events behind the Beatles' break-up, particularly the difficulties surrounding Apple.
James Alistair Taylor (21 June 1935 – 9 June 2004) was the English personal assistant of Brian Epstein, the manager of the Beatles.
 As an employee at Epstein's company NEMS, Taylor accompanied him when he first saw the Beatles perform, at the Cavern Club in Liverpool on 9 November 1961.
 Taylor subsequently worked as the group's so-called "Mr. Fixit", devising escape routes from crazed fans and assisting the band members in purchasing property.
 He later became general manager of Apple Corps but was fired soon after Allen Klein arrived to address the company's financial problems.
 Taylor published various memoirs of his years in the Beatles' employ, including "Yesterday: The Beatles Remembered" and "With the Beatles".
Apple Records is a record label founded by the Beatles in 1968, as a division of Apple Corps Ltd.
 It was initially intended as a creative outlet for the Beatles, both as a group and individually, plus a selection of other artists including Mary Hopkin, James Taylor, Badfinger, and Billy Preston.
 In practice, by the mid-1970s, the roster had become dominated with releases by the former Beatles as solo artists.
 Allen Klein managed the label from 1969 to 1973.
 It was then managed by Neil Aspinall on behalf of the four Beatles and their heirs.
 He retired in 2007 and was replaced by Jeff Jones.