Colegio Teresiano was one of Antoni Gaudí's first commissions and stands in sharp contrast to much of Gaudi's other work. The exterior of the building is relatively simple. Colegio de las Teresianas does not have the bold colors or playful mosaics found in other buildings by Gaudi. Gaudi was clearly inspired by Gothic architecture, but instead of using pointed Gothic arches, Gaudi gave the arches a unique parabola shape. Natural light floods the interior hallways. The flat roof is topped with a chimney similar to the ones seen at Palau Güell.
It's especially interesting to compare Colegio Teresiano to the luxurious Palau Güell, since Antoni Gaudí worked on these two buildings at the same time.
During the Spanish Civil War, Colegio Teresiano was invaded. Furniture, original blueprints, and some decorations were burned and lost forever. Colegio Teresiano was declared a Historical-Artistic Monument of National Interest in 1969.