SanderO wrote:I think that current analysis would not justify these monsters.
I totally agree. They are impressive and beautiful but I doubt in most cases are truly economical in the long run. Part of it is likely the influence of antiquated transportation, where distance could be a signficant cost. Now, people commute to Manhattan in droves from the upstate 'tent cities', as Mayor Koch called them. Does it really matter if they stopped 10 miles earlier in their commute, because the metropolis was spread out more? Seems like it would be better.
I think the biggest driver now is ego. Always has been for the tallest buildings.