Montagu House is a Whitehall town house in Westminster, a database landmark in Syndicate. By 1868 it has been rebuilt as a French Renaissance-style mansion.
Walter Francis Scott inherited it in 1859 and replaced it with a palatial mansion. The government took it over in 1917 and demolished it in 1950.
You find it on Whitehall among the government buildings of Westminster. It is a database entry, recorded when you reach it.
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.
Admiralty
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.
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.