The Barcelona Ciutadella del Coneixement initiative aims to transform the area around Ciutadella Park into a southern European hub for innovation in biomedicine, biodiversity, and planetary well-being. The BIST, which will be the first piece in the development, combines a precise structure that organizes research spaces, offices, and laboratories in a systematic and flexible way with an open distribution that frees up the ground floor, allowing the surrounding gardens to be incorporated into the life of the campus. Light, compact, and simple, the building is formed by the superposition of horizontal planes that extend beyond the glass facade to protect the interior spaces from solar radiation. The interior is organized in eight levels around a central atrium connected to a series of large loggias or elevated courtyards. Besides offering opportunities for exchange and interaction between the users of the building, these intermediate spaces act as thermal devices that regulate the interior climate in a passive way and allow a visual continuity between the different levels and the landscape. Aiming for a zero-impact building, the design follows strategies to minimize carbon emissions, reducing construction time with prefabricated elements.