Chelsea Market is actually 19 different buildings on the same block that have merged together over time. The floor layout is truly crazy. Some floors are staggered by a full half height at the interface between buildings, there are exterior courtyards on the inside of the block that are roofed over, and buildings are of differing height. You can see it all on Google Maps; contrast with 111 8th Ave next door (where I sit) that is all one proper building. https://www.google.com/maps/@40.7402908,-74.0061411,325a,35y...
And yeah, we already have a huge amount of office space in Chelsea Market, up to six floors now, and presumably buying the entire block made sense vs continuing to rent.
Hopefully the ground floor marketspace itself won't be affected. I can't imagine we'd kick all that out, though. It wouldn't be a good look. Chelsea Market is an iconic tourist destination.