There will be far more challenge to making the project financially sustainable over the lifetime of the building than in the challenges of its original construction. This is a tremendous amount of office, retail and living space to put and keep on the market, not to mention the amount of electricity, sewage and services it will require.
Sewage! They don't need no steenking sewage.
Will this massive building be built to the same quality and engineering standards that we see at Harbor Freight? If so, someday its failure will be a substantial disaster.