How Are You at Tree ID?

I keep admiring this tree in the neighbor's yard across the street. I've posted the tree, from a distance, so you can see the shape of the trunk and branches. I've also posted a closer view of the leaves at one end of the drooped branch. And finally, I scanned a leaf (which nearly fills an 8 1/2 X 11 piece of paper) as compared to a US quarter, but it came out as a pdf file and I'm not sure how to put that here - if you have some ideas, send me a note and I'll send back a scan of the leaf.

No, the tree does not bloom or at least not that I've seen, nor have I spotted any fruit. Any tree experts out there?