John, I agree about the image quality. I was not entirely forthright when I said "found this tree in Louisville . . ". My sister actually found it and sent me the pics. So, I can't go out and take more (I'm in Nashville). From the close-up of the foliage, a portion in the upper right corner makes me think the leaves or leaflets may be opposite. Not sure if pinnately compound. Of your suggestions, Robinia seems more likely to me, except for the leaflet size. Again, the picture makes scale difficult to determine, but the leaflets look to be in the 3"-4" range, whereas I think Robinia is more like 1"-2" range.
I will see if my sister can get more pictures and the address.
And thanks for all the responses. At least I have some better ideas now.
