It is a Tulip tree. The leaf shape can be heavily lobed (as in that pic) or shallowly lobed.
By the way, I looked at your other thread about same, and the tree in this photo is not a Tulip tree, but the seedling in the same post is a Tulip tree.
http://garden.org/thread/view_...
I
think that tree is a Sycamore maple. Look at the bark, especially (and the leaves).
Later in the thread you do post a Tulip tree:
http://garden.org/thread/view_...
See how the bark (and leaves) are very different.
