What is this tree from a leaf stem
This looks like a type of elm.
I thought so too but the leaves don't have a pronounced point and the veins aren't as pronounced as the elm leaves I compared to it. The leaves are also very small for what will be a large tree. I measured the leaves at about 7/8" wide by about 1 7/8" long.
It might be a lacebark elm (Ulmus parviflora). https://landscapeplants.oregonstate.edu/plants/ulmus-parvifolia
Some jurisdictions in Montgomery County have street tree plans and you can look up the species of trees that are planted, or you could call the county Department of Environmental Protection/Tree Montgomery and ask if they can tell you what species is planted at this location.
I looked at those just now. The leaves seem to come to a narrower point and the veins are more indented, I think. Also the teeth look sharper on the lacebark. I have images of the bark I'm posting if you want to check them. These are saplings so maybe the bark looks different when it matures? I will check with the county and visit their website as you suggest. Maybe it's an Elm afterall!
Take a look also at Zelkova (which is in the elm family and has very similar leaf and bud characteristics). https://landscapeplants.oregonstate.edu/plants/zelkova-serrata
The bark of Zelkova is described as being smooth-gray initially with prominent lenticels (like on cherry trees) which matches what you have in the photos. The lacebark elms get more patchy, mottled, scaly bark.