The Café Théâtre is the Assassin Brotherhood’s headquarters during Arno Dorian’s story in Assassin’s Creed Unity.
Arno acquires the Café Théâtre in Paris and uses it as a base while investigating the murder of his adoptive father and becoming involved with the French Brotherhood. The building is both a safe location and a management feature: restoring it unlocks improvements, generates income, and opens additional activities connected to the Paris campaign.
Unity is set during the French Revolution, and its Paris setting includes major landmarks such as Notre-Dame Cathedral, the Louvre, and the Tuileries. Those landmarks are prominent places to visit, but they are not Arno’s headquarters. The Café Théâtre therefore has a specific gameplay and story role that distinguishes it from the city’s famous public monuments.