VERY little of NYC is build on Fill - and what is, usually has pilings that go to bedrock

There are some spots out in Queens that are on fill that would be an issue (remember all of Brooklyn and Queens is on a giant sandbar called Long Island)

Places that would have to worry include Flushing Meadows Park, the stuff built in the College Point Lowlands down where Flushing Airport was, believe it ot not, stuff near the intersection of Main St and Northern (The RKO Keiths is build on mud, but the building - at least as originally designed was sealed and will float) and other places built on fill