lakekoshare 的鑑定

I believe this is a blue magnolia or cucumber tree, but would love some help. The leaves are alternating, ovate, and smooth on the margins. Leaves are brighter green on the top, but I could not say that they are downy on the underside.
The bark does not have any protuberances, which is one reason I do not think it is a Hackberry.

There are no flowers or fruits on the tree yet.
I cannot tell whether the tree was cultivated or not, but there are three of these trees planted pretty close together along a community pathway, so I am going to mark them as cultivated.