Leicester Square is an entertainment square in the West End, home to the Alhambra Music Hall. In Syndicate its central fountain is reused from Assassin's Creed Unity.
Robert Sidney, Earl of Leicester, walled the land off in the 1630s and public anger forced it open again. It later became known for duels and then for entertainment.
The square's main draw is the Alhambra Music Hall, Maxwell Roth's theatre, where Jacob's memories with Roth begin, including Strange Bedfellows and Triple Theft. The fountain in the centre is modelled on the one in the Place des Vosges in Paris, by way of Unity.
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.
Adelphi Theatre
The Adelphi Theatre is a London playhouse in the Jack the Ripper expansion. It ties into the Woody Shinnings bounty, where Inspector Abberline asks Evie to bring in the understudy who murdered the actor Richard Altman.
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.
Alhambra Music Hall
The Alhambra Music Hall is Maxwell Roth's theatre on Leicester Square in the Strand, the Blighter leader's base and the stage for Jacob's final showdown with him. Several of Jacob's memories with Roth start here.