Growing in SE zone 8a full sun. some of the specimens are 10ft tall or more. All have single, straight trunk, no branching. No signs of seed/flower that I could see. Reminds me of sumac but it's growth habit seems wrong.
Pull one of the compound leaves off and look at the leaf scar it leaves behind.
Here is a link that might be useful:
I'd say ailanthus altissima, tree of heaven, but the leaf stalks are very red. Could still be that, but I don't recall seeing one so red.
ailanthus altissima it is, Thanks!