HOCHTIEF has rehabilitated the core of the so-called IC complex on the grounds of the Ruhr University of Bochum. This is a nine-story building structure with heritage status together with its two three-story annexes and the lecture halls belonging to the complex. HOCHTIEF first of all demolished all parts of the building except the primary bearing structures, and thereby performed the comprehensive disposal of hazardous wastes. Shortly after this it worked on building complex IA – IB, which was completely demolished because of the extreme contamination with hazardous substances, and then rebuilt it according to heritage status requirements. HOCHTIEF also built a new adjoining research building with laboratories and clean rooms.