In Assassin's Creed Unity, the Café Théâtre contains the first major Assassin headquarters that Arno restores in Paris.
The Café Théâtre is located in the Île Saint-Louis district and becomes Arno Dorian's base of operations after he is inducted into the Assassin Brotherhood. Players can renovate the building, unlock improvements, and use it as a hub for additional activities and income.
Notre-Dame Cathedral, the Louvre, and Versailles Palace are all important locations in Unity, but they serve different narrative or exploration purposes. Their prominence in the game's recreation of revolutionary France can make them seem like likely headquarters.
Unity is set during the French Revolution and depicts Paris in 1789 and the following revolutionary years. The Café Théâtre also gives the game a social and economic management layer alongside its stealth missions.