adma
Superstar
... and in the context of the rampant development and 'non-architecture' that steadily encroaches Adma's point about 'authenticity' feels even more urgent because whether you 'like' it or not, or whether we collectively appreciate it yet or not, 90 Harbour is thoughtfull architecture (as Rebecca points out) and carries a certain dignity or integrity that will not likely be the case with yet another boxy glass tower in the area.
Personally, I'd rather shy away from judging "boxy glass towers" in these arguments. It feeds the cynicism re heritage buffs being paranoid reactionaries, etc.
Instead, let's bow to today's green arguments and judge 90 Harbour's value in straight-on terms of "existing building fabric". Sure, it's less romantic than the more common stylistic argument--but it may be the best, most fundamental way of tackling the issue. Start with that fundamental, and let the stylistic details take root from there...