The entirety of Hudson Yards Phase 1 cost $25 billion and they built something like EIGHT skyscrapers, malls, and the biggest cantilever deck over rail in the world I think. The proposed area where Phase 2 is (to the west) doesn't need the same complex cantilever structure so I kind of agree the cost estimate is insane, I can't see how it should cost almost 1/3 the cost of the entire Phase 1.