Correct, not ornamental - the leaf looks like a rather large tulip. My father in law is identifying it as tulipwood, but personally, I have no clue. I would guess 30-35 feet tall, and the trunk splits into 3 sections, a rather large trunk at the bottom but at about 3 or 4 feet above the ground the 3 splits might each be 10" (give or take) in diameter.
However, if you're a bowl turner, tulip poplar makes excellent utility ware. The wood, once dried, doesn't impart flavor to food, and while it isn't the most attractive wood in the world, it's somewhat soft so it turns quickly and easily, and it is difficult to split, which is a good property for making salad bowls, dough bowls, etc...