The first part of the order is the rehabilitation, extension and conditioning for library use of an existing facility, work of the architect Marcià Codinachs in Via Favència, in an urban section enabled on the roof of the Ronda de Dalt in Barcelona.

The second part of the project consists of the urbanisation of the adjacent spaces, in particular the area between the two existing buildings, where the main access that turns this space into a large outdoor hall open to the city is located.

It is a neighbourhood library with a public area at the level of the access street where the spaces intended for the children's area, computers, daily press, training and study classes are located. The program is organised between the existing building and a new annex building, adjacent to the old one and connected to it through a multipurpose transitional space. On the ground floor, taking advantage of the slope of the Ronda de Dalt, are the meeting room with independent access and the internal work area.

The structural approach of the extended building, conditioned by the delicate situation of the site (above the cover of the ring roads), is solved with a steel structure in the form of a bridge, on three benches supported on existing factory work, with lights of close to 15 metres. This structural principle allows open spaces with natural lighting that provide the complex with a great environmental quality.

In the existing building, running longitudinal skylights, oriented to the north, provide constant homogeneous light and are at the same time the support of a photovoltaic installation.
The general image of the exterior aims to be very aggressive and monolithic, with forceful and clear geometries, in contrast to a warm environment with great acoustic and visual comfort inside. This effect is achieved with the treatment of the materials used, enhancing their characteristics and their own expression: "Corten" steel on the outside and light woods (birch) on the inside.

The annex building is a rectangular "Corten" steel body that is suspended and separated from the existing equipment. This new space opens to the east with a large double-height window and a sloping sky that accentuates the effect of perspective and focuses the vision on the city, while it is completely closed to the noise of the side streets.
The main façade, made of perforated "tallin" sheet metal, allows you to play with very variable light gradients depending on the time of day and night, becoming a completely transparent filter or an absolutely opaque screen.

The library has become a meeting point and point of reference in the neighbourhood due to the forceful and easy-to-read geometries on the outside and the very clear organisation of spaces and routes inside, where the materials used and the scale provide a warm and welcoming atmosphere.