Might be over a major tunnel juncture. Looks to be over a rumored line running N-S left of Central Park and a rumored spur E-W going towards the pier the hospital ship was docked at (99). That E-W spur has the Clinton Foundation over it, I think.
There was a thread a year or so ago where someone, who very well could have been Kushner himself, said it s location was too strategic to let the bad guys have it (or something along those line, IIRC).