Universiteitssingel 50 is part of the so-called Medizinische Kleinstadt (‘medical city’), an urban development plan by Ungers/Von Brandt. In this plan, the new buildings for this area are linked to each other and designed in harmony with their immediate environment. The linked buildings form a kind of city wall that serves to protect, as it were, the medical city behind it. This original concept was elaborated by Architecten aan de Maas (AadM). The concept underlying the urban development plan of the Ungers/Von Brandt firm was that the buildings of Universiteitssingel 50 would together form a city wall, stretching in a north-south direction, parallel to the nearby highway. The round library building and the east building serve as bastion, further emphasizing the notion of a reinforced fortress. Footbridges, which interconnect the various buildings, serve much like entrance gates in the wall that provide access to the medical city behind it. The walled fortress concept is also reflected in the shape and sizes of the buildings that constitute the wall. The main building, for instance, has seven stories, a length of 240 meters and a width of 23 meters. Built in 1990, Universiteitssingel 50 houses offices, meeting spaces, lecture halls, classrooms, computer rooms, meeting halls, archives, laboratories, workstations and spaces for laboratory animals, including all the various complex technologies needed. In 1992, the semi-circular large bastion was realized to house the skills lab as well as several collections of the University library.