When Max gets to the D3 needing Gemma's help, he is less than 40km from his meeting with the Notaire Auzet. When he gets to the intersection he is facing south and the sun is to his left, meaning it is morning and his appointment was for the afternoon, giving him plenty of time to arrive at his destination. We are shown him by a tree telling Gemma to reschedule and this would not have been necessary.
It is constantly suggested that Max works in 30 St. Mary Axe, one of London's best known recent buildings designed by Norman Foster, which has a radial plan with a strong diagonal diagrid frame wrapping the exterior wall. The interior shots of the firm take place inside a standard rectilinear office building with regular columns. (See Basic Instinct 2 (2006) for scenes that appear to have been filmed inside 30 St. Mary Axe.)