One Victoria | 63 m | 19 fl | Complete

[Viewfromthe42]

I've read that all-glass building envelopes are actually kind of problematic for all sorts of practical reasons (e.g. energy efficiency).

A lot of that was information fed to the press by the not-glass-segment of the construction industry. I pointed out, for example, that in Europe the highest levels of energy efficiency essentially demand a glass enclosure on the building, which is the exact opposite of what said lobbyists were claiming.

A building enclosed in glass is different from a glass-walled building. You can get all kinds of temperature and noise control from both, but trying for all-glass solutions tends to perform worse and cost more, though not always.