Battery Park City was built on landfill – the ground removed for the original World Trade Center excavations.
The architecture, naturally, is all new – post-1980. But the interesting part of Battery Park City is how its apartment and commercial buildings have been combined with green space: there really is a park in the middle of Battery Park City.
The Esplanade is the park’s backbone, running from Battery Place up to Chambers Street along the Hudson River. It is a link in the growing “Greenway” bike/pedestrian path along most of New York’s waterfront.