Only about 10' tall right now.
SOLVED: Tree ID Please
Could you post full size pictures? Those two are so compressed, not much can be made out.
I suspect it is a fruit tree of some sort, maybe a Prunus sp.
I rescind the Prunus sp. suggestion.
That's a Rhamnus sp. (syn. Frangula sp.) - possibly Rhamnus cathartica - one of the invasive exotic Buckthorn clan.
There looks to be a cluster of greenish fruit that will mature to blue/black. These are relished and then distributed by birds far and wide - as is how many pest plants are dispersed.
See if there are spiky/thorny tips to the stubby branchlets. That's another good ID feature. If you are not absolutely beholden to the plant, you could prune off a good chunk of a branch, and lay it down to intensively photograph all its parts to then post here.