In Assassin's Creed Unity, which famous Paris landmark is the Brotherhood's main headquarters?

In Assassin's Creed Unity, the Café Théâtre is the Assassin Brotherhood's main headquarters in Paris.

Arno Dorian uses the Café Théâtre as his base during the French Revolution. It is located on the Île Saint-Louis and becomes available after the early story establishes Arno's connection to the Parisian Brotherhood.

The building can be renovated and expanded. Improvements provide income and unlock activities, including social events and additional missions. This makes the Café Théâtre one of Unity's important progression hubs, alongside the wider city of Paris.

Unity is set primarily during the French Revolution, beginning in 1789. Its Paris includes famous landmarks such as Notre-Dame, the Louvre, and the Bastille, but those sites are not the Brotherhood headquarters. The Café Théâtre is a fictionalized headquarters placed within the game's historical city.