its kinba hard to tell. if catkins are present on it i would be inclined to say maybe a gray birch(betula populifolia).
im not sure but the bark exhibits similar characteristics and the leaves look slighty like birch in the photo, although i dont know for sure.
I was not sure yesterday because I have not seen one in a while . I saw one today and I am going to say Zelkova for sure .It is being used as A street tree replace for American Elm due to the vase shaped canopy.