Hmm, that could be Tree of Heaven. Can you get a close up of one set of leaves?

I'm thinking either privet or Euonymus alatus. Yes, a close up of the the foliage would help.

Sorbaria sorbifolia?

Here is a link that might be useful:

Thanks everyone-- here's a close up!

Well, not Tree of Heaven!

Thank Heaven for that!

And not either of my guesses, either!

Rhus glabra.

Op's plant is bi-serrate not simply serrate like R. glabra.

Now that I look at pictures and think back, it did get white flowers like the Sorbaria sorbifolia...