You make a new waterfront, the same way NYC has already done. You can look at the map at https://www.thirteen.org/dutchny/interactives/interactive-map-manhatta

You make a new waterfront, the same way NYC has already done. You can look at the map at https://www.thirteen.org/dutchny/interactives/interactive-map-manhattan-in-1609/ https://www.thirteen.org/dutchny/interactives/interactive-ma... to see how much land was added. Most of lower Manhattan is built on what was ocean in 1609. It's an engineering problem, and NYC can afford to solve it.