I figured looking up tall residential building and seeing what they do would be a good indicator of norms. The tallest Residential building in New York is Cent

I figured looking up tall residential building and seeing what they do would be a good indicator of norms. The tallest Residential building in New York is Central Park Tower at 98 above ground floors: The residential stories have casement windows, within the curtain wall, that can swing up to 4 inches (100 mm) outward. In addition, some condominium units have motorized windows at least seven feet (2.1 m) above the floor.[1] The condominiums start on the 32nd floor, according to the same article. If building can't easily be retrofitted to allow openable windows, then I would assume they either can't be used for residential or they could try to get some sort of exemption if they can prove it's safe. I'm mostly going off what I know about building codes and what I've read previously on the topic when it's posted and it's delved into what the actual problems are in converting to residential. 1: https://en.wikipedia.org/wiki/Central_Park_Tower https://en.wikipedia.org/wiki/Central_Park_Tower