Is there any place in the 5 boros of NY City where one would need an eiruv techumin? I am thinking specifically of Rockaway Turnpike going toward the 5 Towns or back. Kennedy airport's fence is on the right and it seems to me that there are large stretches of land with no buildings unless you count some airport buildings behind the fence but quite far in from the road.
Also Staten Island may or may not have uninhabited areas that equal 2000 amos.
I'm afraid we cannot help you with this. You will have to ask a local Posek who knows what the city looks like.
Kollel Iyun Hadaf