We can thank marathoners because they do a great job documenting the elevation profiles of marathon courses, including the NYC marathon.
I can't link it, but search nyc marathon elevation profile and you'll have exactly what you're looking for.
The main reason for the apparent disparity in grades is that while the center is 130 feet high, you start from a hill of over 50 feet in height.
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“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance.