The building responds to a complex, urban situation of disconnection between the buildings of the Campus, a problem that the building attempts to solve with its implementation. On the other hand, the volume that occupies Phase 1 will condition the possibilities of development and implantation of Phase 2, which will contain the main uses of the ITB, explaining why Phase 1 works as a tool for the recovery of soil. It is a simple and austere building, which voluntarily renounces to highlight, in order to prepare the best conditions for the development of Phase 2 to be located above. Phase 1 of the ITB is a building-square, which takes advantage of the unevenness of the plot so that its cover functions as a large square that acts as a hinge between the University Hospital, the College of Medicine and other adjacent uses.
The Phase 1 building has laboratories and animal facilities, including a maximum safety area for immune-suppressed animals. The glazing of the facades and the patios with zenithal light guarantee a correct and homogenous illumination of the laboratories. The laboratories are located on the ground floor; the animal center in the basement and in between both there is a technical plant facility, so that the cover is released for public use.