got a closer look today from the One Liberty Observation Deck, looks like a little bit of activity - some welding going on about half way up the hotel portion, saw maybe 5 workers in total spread around though nothing on the roof level. Not the greatest pictures but with the binoculars they have mounted up there you can get a pretty detailed view of everything & from what I could see it looks like they're welding some beams that fall somewhere between each floor presumably to attach the windows to. It looks like they're working from the top down, there are maybe 4 sets of these.
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