Palau Baró de Quadras was remodelled into a Neo-gothic palace to plans by Catalan architect Josep Puig i Cadafalch between 1904 and 1906. The original building was constructed in 1882.
The detailed stonework of main facade on Avinguda Diagonal was created by Eusebi Arnau and Alfons Jujol.
Carriages and later cars, could pass through the building. The ceramics were created by Mario Maragliano.
A central interior courtyard with a fountain and Roman-style mosaic flooring gives access to the monumental stone staircase leading to the main floor. It is illuminated by a stained glass skylight.
The living room overlooks the Diagonal avenue. It features a large central hall and a gallery, separated by marble columns. Its eight stained-glass windows are decorated with floral motifs.
The dining room overlooks Carrer Rosselló. Flanked by two columns made from red marble, its fireplace is decorated with blue ceramic tiles and a large coat of arms of the Baron.