Official Public Space in Midtown Office Building

This was something new to me: I know the City has Cooling Centers during the summer where people can go who either do not have a/c or cannot afford to run it all the time,--but I never saw some place just designated a "Public Space" before. Seems like pretty affluent people hang out  there, it is no magnet for homeless people as far as I can tell....(like the public libraries used to be).

See what Internet says...nope. nothing that seems to explain this place.