The project’s proposal is complex, in response to a place with a great mix of urban interference. The choice of this shape is based on two considerations: first, the character that the main façade adopts as a backdrop for the site where the building is located. This façade should be considered as an addition to the large rear façades of the buildings that have access to República Argentina Avenue. Secondly, the project takes into account the transformations of use and concept that will take place in this part of the city thanks to the connection of the "green corridor" with Lesseps Square. In the first case, an attempt is made to merge the volume of the library with the subsequent volumes. In plan, this translates into a rhomboidal perimeter that completes the morphology initiated by those buildings. The library thus confronts the staircase and the character of Lesseps Square as another piece of the urban fabric behind it.

The proposal stems from two considerations:

a) Understanding the importance of the façade as a backdrop for the library site and the sum of the large rear façades of the buildings with access via República Argentina Avenue.

b) Provide the radical change that the direct connection of the "green corridor" (limited between the Hospital Militar Avenue and Bolívar Street) with Lesseps Square will have on the use and understanding of this part of the city will have.

In the first case, an attempt is made to merge the library's own volume with that of the later buildings. This goal translates into the plan by defining its boundary with a rhomboidal geometry that completes the volume initiated by these buildings. With this operation, the library faces the large open area that embodies Lesseps Square from the stairs and protection that provides the volume that makes up the buildings already mentioned.

In the second case, the opening of this green corridor, to the north of Lesseps Square, has been understood as a public axis that expresses and collects the singular topography on which this part of the city is based (slope of a mountain, green area mixed with construction), of which precisely the square is presented as the end or as the beginning. It could be said that the mountains (Collserola) reach Lesseps and from there the city has a different consistency, more linked to the layout of the streets than to the topography or the slope.

Expressing this condition of Lesseps Square’s mountain-city boundary has led us to configure the library in terms of volume, almost like a building that, coming from Collserola, is located above the city with the attributes of the mountains.