Fan Girl has posted six photos of Keanu Reeves from Saturday in Paris. They are reporting that he is a convenience store but I believe that to be incorrect. If I recall correctly they are leaving the building on the way to the morning interviews. The photos are here.
Note: If you look at the video that is in the ‘overhelmed by the crowd ‘post, you will see him leaving the building and going through an area that is clearly marked for the CEFF. He also has his CEFF handler with him. There is a sign on the building for a drug store and a steak house but that only indicates they are located in the building and not that he visited them.
Update:One of the readers has left a comment that the Publicis Cinema is in that building.