Roca Museum - Historical Research Institute, National history museum in Recoleta, Buenos Aires, Argentina

The Roca Museum occupies the former residence of surgeon and diplomat José Arce at Vicente López 2220, in Recoleta. Architect Francisco Squirru gave the house, finished in 1933, a modern neoclassical style close to art deco. Inside are ebony wood panelling, ivory and limestone decoration, a music room with a piano, and one of the oldest libraries in Buenos Aires.

José Arce, a surgeon and diplomat, donated his house and Roca-related objects to the national state; the research institute was agreed with President Arturo Frondizi on 25 August 1961 and inaugurated on 17 July 1964 under President Arturo Illia. The Arce family formally donated the property in 1968, and the state later added objects from Roca's presidencies, the Generation of 1880 and the national organization.

The entrance vestibule bears the motto attributed to Aristotle, "Amicus Plato. Sed magis amica veritas", chosen by José Arce to signal that the institute would study Roca without glorifying him. The music room, where Arce played piano as an amateur, hosted musical gatherings broadcast by Radio Splendid, with Belgian pianist Julio Perceval taking part.

The museum is at Vicente López 2220 in Recoleta, not San Telmo. The upper floor, kept as an art deco interior with objects from the Arce family, can be visited. The building is also used as a film set, so some rooms may be closed for filming.

José Arce had a music room with a piano installed in the house, where he played as an amateur; the musical gatherings there were even broadcast by Radio Splendid, with Belgian pianist Julio Perceval taking part. The second floor is now open to visitors as an example of art deco style, with objects from the Arce family's life.