they will demolish completely?
Yes! Gone forever!
If 270 Park looks anything like that it will make every other building near it look very dated.
I am not a fan of that base. From a pedestrian perspective, besides maybe landscaping and some seating, all one sees is a building on stilts, a huge slanted wall/overhang and a concrete core. That is not very inviting or attractive.
It’s very reminiscent of his Toronto proposal. External structure doubling as a decorative feature with green wall:
It really seems like a poorly executed, Russian version of 45 Broad just from the base.