Alpine hill in NJ is a long uninterrupted hill that a lot of riders use. The Bronx has some, upper Manhattan has some. All said though there isn't all that much. The longest hill that I've done in the NYC area is up Bear Mountain on Perkins. That is 1500' and about a 5% steady grade. Compared to the west though it is just a bump in the road. I used it to train for a climb up Mt Haleakala in Maui, but it wasn't enough. Makawao is at 1500', and that is just the beginning of a very long climb.