"luckily no covid virus 20 years ago" Broader pharmacology may have been in play. Plus there was a dress code.
I think the largest occupied floor in the U.S. is at BP in Chicago. NYSE may have more sq. feet, but it's mostly for - IMHO - media showcasing.
In truth, that last photo looks like a bunch of extras on the set of Star Trek: TOS. Got the yellow shirts and the red shirts.
Yellowjackets were non-member lowly clerks, floor opioid dealers, and a handful of off-hour strippers used to attract order flow and entertain desk brokers. Everyone started out as a yellowjacket...except maybe Don R. Wilson (DRW)