The project for the rehabilitation and extension of the Faculty of Cellular and Genetic Biology of the University of Alcalá was conditioned by two aspects: an existing building that had to be both maintained and extended in order to adapt to the needs and demands of today.The existing building, originally the first aerodrome building for military use dating from the first half of the twentieth century, had been adapted with some difficulty from the late sixties onwards to suit the needs of the university with the founding of the present-day campus. Following a series of minor renovation-works over the last forty years, the building was in need of refurbishment and lacked the necessary space for the research and teaching required by the Departments of Cellular and Genetic Biology.