Battery Park City came from the WTC excavation but The Battery itself was also landfill that came from street widening and stuff like that going back to the mid 1800s. The original western edge of lower Manhattan was essentially Greenwich Street all the way up to about 15th St in the Meatpacking District. (So the WTC site was indeed once underwater, but idk if that land came from Grand Central or not).

https://en.m.wikipedia.org/wiki/Lower_Manhattan_expansion