Errázuriz Palace, Art museum and national historical monument in Palermo, Buenos Aires, Argentina

The Errázuriz Palace is a four-storey French academic-style mansion in Palermo, Buenos Aires, now the National Museum of Decorative Art. Its Louis XVI facades are clad in Paris-stone simili, with a central pediment and portico of four fluted columns behind a black iron fence. Inside, the stuc pierre vestibule has Doric pilasters and a vaulted coffered ceiling, and the rooms span more than 200 years of French decoration.

In 1911 the Alvear siblings commissioned French architect René Sergent, who designed the palace without ever visiting Argentina; local firm Lanús y Hary oversaw construction from the early 1910s, delayed by World War I material shortages and by materials and craftsmen imported from Europe. The Errázuriz-Alvear lived here about twenty years; the Argentine state bought it in 1937 for a symbolic price with most of its furniture, and it was declared a National Historic Monument on 16 May 1997.

The building houses the Museo Nacional de Arte Decorativo and also serves as the seat of the Academia Argentina de las Letras and the Academia Nacional de Bellas Artes. Its rooms trace more than 200 years of French decorative styles, from Louis XVI to the Art Deco petit salon painted by José María Sert on the first floor.

The palace stands at Avenida del Libertador 1902 in Palermo, behind an iron fence with pointed finials and circular motifs; the entrance portico has four fluted columns. The building has four floors, with the social rooms on the main floor reached by the honor staircase from the vestibule. Since 2018 the original furniture is frequently moved for temporary exhibitions, so room displays change between visits.

René Sergent directed the project from Paris without ever visiting Argentina, and the Paris-trained firm Lanús y Hary carried out the work locally. The gardens by Achille Duchêne were laid out as outdoor salons, and because the house fills most of the plot, the cour d'honneur opens directly into one of them.