American Sycamore (Platanus occidentalis) is sometimes confused for its genetically crossed sibling, London Plane (Platanus × hispanica), which is all over the city, on streets and in parks. In fact, finding an American Sycamore is a good challenge.
London Plane in typical habitat, a park, for comparison. The bark situation stands out.
Am Syc are barky up the trunk, only getting to the smooth, multi-colored, peeling away look higher on the main stem and the branches.
Leaves can be quite large.
Two seed balls on one stem is generally a characteristic of the L.P., and unusual for an American Sycamore, but it has been known to happen.
A couple more of the Am Syc seed balls. Below are two examples of L.P. seed balls:
Backyard and Beyond 
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