Here is the history of that building:
The Triage Lavoir building was built shortly after world war 2. It was a coal washing plant. Often coal that's pulled from the ground needs to be washed before it can be sold to homes or industry. It was built under the Marshal plan that was to help rebuild Europe. It's just over the border in Belgium.
Several years after it was built, the local coal mines shut down and the building was abandoned and much of the machinery was stripped from it.
So it sat abanadoned and then in 2003, Alizee became a star and an idea came up for a video for the song A Contre Courant. "The video was directed by Pierre Stine, who also suggested the filming location.
After that, there was a plan to fix up the building and put in some small businesses and offices. They completed the outside, but then construction stopped for a few years.
Scuffydog has posted before that he visited that building in 2011. Here is a video of his drive up to that building:
When he was there, he found all the ground floor entrances locked, but he found a way in and took many pictures and videos. Good for Scruffydog!
Inside, he found a relatively new, archaeology speaking, hand print on a window ledge where Alizeé can be seen putting her hand during the video. It must've been hers, because who else would want to put their hands on that dusty surface?
This was posted in this forum in 2011:
Here are is a photo of the handprints, and also a photo of Alizeé, during the filming, putting her hand down on that ledge.
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