Okay, first attempt at closing it (https://www.openstreetmap.org/changeset/181118471). Does the geometry of the works zone (https://www.openstreetmap.org/way/1498072882) match what you saw?

I didn't include the parking alley or the Atelier Brancusi as you told me you weren't sure they were included. I did include the chimneys on the western edge of the Place, as well as the eastern tree row, though not the western one (I wagered they were on the sidewalk of Rue Saint-Martin). I went until the bollards of Rue Saint-Merrie, it should not disturb routers and traffic. But without knowing exactly where to stop, the southern end is kind of arbitrary--it will need correction. Thank you for your contributions to OSM!
