Regards.
The WTC site in Manhatten is some of the priciest real estate on the face of the planet. But our economy doesn't depend on anything being built there.
If the private sector wants to erect some new office buildings there -- fine, they can build whatever they want. But IMHO, it is disrespectful to refer to any kind of commercial real estate as a "memorial" to those who perished.
And no matter how fancy the new Manhatten offices will be, they are still not vital to our economy. This is the 21st Century: "The Information Age". More and more business is conducted electronicly. There is no need to locate in congested Manhatten.