You posted your question and in half an hour got the answer, Rose of Sharon, Hibiscus syriacus. You are welcome!
For a little bonus information, watch out for RoS, it spreads like crazy. Not only does the colony get bigger and bigger, but it pops up all over the place. I have one that popped up on the opposite side of my house from where the one I planted is and I pull shoots of RoS all the time.
Here's a Rose of Sharon pruned to tree form (and probably grafted on to a standard) :
https://www.meridian.k12.il.us/middle%20 ... 20tree.jpg
Left to its own devices it looks more like this:
https://www.arborday.org/trees/graphics/ ... aron_1.jpg