I wonder if it's time to think about 'scale'
No, I don't mean - react with fear of concentration as "a target" - just: whether there is any actual advantage to having so many diverse (however finance-related) operations in One Huge Place?
Renewal of other neighborhoods could be a byproduct of the necessary rebuilding. Or *must* we react mindlessly, simply to "show them we'll build it taller and better"? Are we yet over, Bigger Must be Better?
With NY's superb transporation system, surely the spreading of 9-5 mass movements could always be better accommodated via a dispersal: and via fibre - you'd retain the same connections amongst all those workstations dealing with imaginary 'money' / 1s, 0s.
Such an intentional deconcentration would also set the stage for - much more decentralization, the 'work at home' option now clearly as emotion-effective as it is cost-effective (for at least significant portions of many businesses).
??
Ashton