[7] On September 13, 1810, the Primera Junta created the Public Library of Buenos Aires, being the Cabildo its first location for two years.

[11] Its construction was financed with taxes from the port of Buenos Aires, the building was finished in 1610 but was soon found to be too small and had to be expanded.

The construction of the two humble rooms (the Chapter House and the Prison) was in charge of the builder Juan Méndez, while Hernando de la Cueva was in charge of the braces, Pedro Ramírez of the doors and windows, Hernando Álvarez of the plastering and whitewashing.

[2] On July 23, 1725, construction of the new building began, according to plans by the Jesuit architects Giovanni Battista Primoli and Andrea Bianchi.

[2] After the May Revolution in 1810, when the building served as seat for the congressmen that established the first Argentine government, the cabildo as a political institution continued operating until 1821, when it was dissolved.

Architect Pedro Benoit planned a total renovation that included the elevation of the tower (ten meters) and placing a tiled dome in Nordic style.

[2] In 1889, due to the opening of Avenida de Mayo, three arches on the north side of the building were demolished, with works carried out by architect Juan Antonio Buschiazzo.

The tower built by Benoit was also demolished alleging that its excessive weight endangered the stability of the construction.