Happened as dated, per the source^[1]: "the $1bn US embassy in London opened its doors to the public for the first time on 16 January" 2018.

Start: Jan 16, 201890% CONFIDENCEsource

US Embassy Opens in Nine Elms, London

The US opened its $1BN embassy in London's Nine Elms, a 12-storey glass-cube fortress replacing the historic Grosvenor Square site the US had occupied since 1785.

The US embassy at 33 Nine Elms Lane was open to the public from 13 December 2017 and formally opened on 16 January 2018 - the pin's date^[2]
It is the largest American embassy in Western Europe, overlooking the Thames^[2]
Neither source states the $1 billion the pin gives: the Wikipedia article carries no cost figure^[2], and on the video page the only such number is inside the link slug "the-secret-architecture-of-americas-1billion-fortress", which the description itself does not state^[1]
The US presence in Grosvenor Square runs back to 1785, when John Adams opened the first American legation in London at 9 Grosvenor Square, upgraded to an embassy in 1893; the mission moved several times (Victoria Street 1883-1912, 4 Grosvenor Gardens 1912, 1 Grosvenor Square 1938) before the Eero Saarinen chancery at 30 Grosvenor Square opened in 1960^[2]
That old chancery was leased from the Duke of Westminster for a symbolic peppercorn rent, carried Theodore Roszak's gilded aluminum eagle with a wingspan of over 11 metres, was Grade II listed in October 2009, served as chancery until 2017 and reopened in 2025 as The Chancery Rosewood hotel^[2]
The B1M's film, "The Secret Security of America's London Embassy" published 11 December 2023, frames the building as "how the US built its most hi-tech and controversial embassy", with chapters on London Embassies, Little America, Sarf London and The Secret Fortress^[1]
Its cited research includes a Harvard Design Magazine piece "Fortress London: the new US embassy and the rise of counter-terror urbanism", Lambeth council's Vauxhall Nine Elms Battersea regeneration page and the embassy's own design concept page^[1]
The site has drawn repeated protest: 10,000-strong Vietnam War demonstrations in March 1968 at the old embassy, the 2020 George Floyd protests, Just Stop Oil painting the compound wall on 6 November 2024, and Greenpeace UK activists pouring red dye into the water on 10 April 2025 with six arrested^[2]
Neither wiki describes the building as a 12-storey glass cube, as the pin does^[1][2]

@BuildDesk

Cost $1B

References 385% CONFIDENCE

The first entry is always the pin's source. Overall confidence is a weighted average of how firmly each reference supports the start and end times used above; a reference counts half as much for every 180 days older than the newest.

[1]90%

youtube.com/watch?v=2G-HdtbO4CI

youtube.com· Posted Sep 15, 2026· Starts Jan 16, 2018 ✓· 60% of score

Happened as dated, per the source: "the $1bn US embassy in London opened its doors to the public for the first time on 16 January" 2018.

[2]78%

Embassy of the United States, London – Wikipedia

en.wikipedia.org· Published Jun 1, 2026· 40% of score

Wikipedia confirms the embassy "has been open to the public since 13 December 2017" and "was formally opened on 16 January 2018," an exact match to the pin's stored date for the formal opening.

[3]80%

A First Look Inside The New U.S. Embassy In Nine Elms – Londonist

londonist.com· Published Jan 16, 2018· 0% of score

Londonist's own piece, "A First Look Inside The New U.S. Embassy In Nine Elms," carries the same 16 January 2018 publish date as the pin's stored date, though the article itself returned a 403 error and could not be retrieved to confirm further detail.

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