The building was originally planned by Foster's office as the headquarters of the Banco Ciudad bank, but then the project was redesigned under the administration of the Argentine capital. Changing the purpose of the building "on the fly" was allowed by the planning grid with a step of 8 m, which gave a choice from a large number of specific solutions.
The Town Hall occupies an entire block in the Parque Patricios area, next to the park of the same name. Its glazed facades link the interior with the greenery outside and provide natural light - as do the two patios. At the same time, the building is protected from the heat of the sun by the deep removal of the undulating roof, and blinds on the east and west facades.
The concrete roof and supports, which have received a decorative texture in the interior, remind of the working, industrial past of the area. At the same time, the protruding roof opens the building to the city, connecting the square in front of it with the interior - first of all, with the full-height atrium, which serves as a kind of entrance zone. There are four tiers of offices with a free plan facing. The fact that all parts of the building are visually well connected, according to the architects, creates a sense of community among the employees, of which there are about 1300-1500, and contributes to better communication between different departments.
The use of natural light, thermal mass of concrete to cool the interior, passive sunscreens allowed the town hall to be the first public building in Argentina to receive the LEED Silver Energy Certificate.
