The Admiralty is a government office on Whitehall in Westminster, one of the period buildings you can climb and read about in the in-game database. No memory centres on it.
It housed the board that ran the Royal Navy, with a board room, state rooms and apartments for the Lords of the Admiralty. When the street was widened in 1759 and cut into the courtyard, a new street-facing screen was added.
The Admiralty stands at the Trafalgar Square end of Whitehall in Westminster, so it pairs naturally with Horse Guards, the Foreign Office and Downing Street on one walk. In the World War I simulation, Churchill mentions his past as First Lord of the Admiralty when talking about his armed boat.
10 Downing Street
10 Downing Street is the Prime Minister's home and office in Westminster. In 1868 Benjamin Disraeli lives here, and Jacob's work as his bodyguard in Sequence 7 starts outside the house.
Banqueting Hall
The Banqueting Hall, later the Chapel Royal, is a 1622 hall on Whitehall in Westminster and a database landmark in Syndicate. It is the only surviving part of the old Palace of Whitehall.
Blue Anchor Alley
Blue Anchor Alley is a Blighter stronghold in Westminster run under Lilla Graves, one of two in that borough. Freeing it lets the Rooks set up there instead.
Buckingham Palace
Buckingham Palace is Queen Victoria's London home in Westminster and the setting for the climax of Syndicate's story, the Queen's ball. It is also where the Queen hands out the Operation side memories, and it has a viewpoint.