One point he brought up is that the fire commissioner opposed the original twin towers for being dangerous; if they hadn't fell, the only way they could fight a fire is to go to the roof or else let the thing burn upward till it went out by itself.
The port authority however is not under NYCity law and built it anyway.
In view of this, unless you give everyone on the upper floors parachutes, I doubt you'll find people to work there...especially since those of use who know Manhatten remember how the towers stood high and lonely at the south side of the island--as opposed to having a lot of other buildings nearby that would make it harder to crash into them.
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