In the city centre of Utrecht shopping centre Hoog Catharijne is situated, with offices and apartments on top of it. Altoon and Porter Architects from Los Angeles was asked to redefine the complex in its context and its relation with the city and to extend it and make it more efficient. Partly by high-quality new constructions, but also by means of sustainable renovation and reuse. In that process OeverZaaijer is involved as co-architect.