The building was originally constructed in 1798. It is one of the better-known structures in the Vieux Carre from the period. The building was completed in 1806, operating first as a grocery. The first floor was converted into a bar around 1836. By 1842, the Aleix family began to manage the bar; the family were
Catalonian immigrants, like the building's owners. Under their ownership, the bar gained a bohemian following, though it was not considered one of the leading bars in New Orleans. By 1869, it began being advertised under the name "the Absinthe House". Around 1870, Aleix hired bartender Cayetano Ferrer, who was highly regarded for his work at the French Opera House. Ferrer took over management of the bar three years later, and helped it earn its reputation, by then titled as the Old Absinthe House or Old Absinthe Room. Ferrer's work, and that of his heirs, helped transform New Orleans from a working-class city into a tourist destination.
Owen Brennan bought the bar in 1943. ==Architecture==