Most of the movie takes place in the wedge-shaped building located at the corner of Boulevard Saint-Michel and Avenue de l'Observatorie, in Paris. Note, however, that the building looks different in the early top-down shot of the main character running from one end of the roof to the other. That is because the building in real life does not have an open rooftop. The rooftop in the top-down shot was digitally superimposed onto the real-life building. And the other rooftop scenes were shot on an entirely different building. (Also, in real life, the building is much larger than it would seem from that digital superimposition.)
