Posting a picture of the leaves would be helpful along with any attributes that have been noticed ie fall color, bark, etc.

Perhaps a birch from the bark color.

Maybe a photo in the daylight and closer up... what zone do you live? I see you have hydrangea in front so not too far West?.... The larger tree on the right looks like a Cleveland Pear, hard to say at a far distance and at night. They line my driveway so I am only going by shape and what I can see. They bloom a mass of small white flowers for only about 2 weeks early Spring then look as your tree does until Fall. A shot in the dark, no pun intended. Just looks as my trees lining my drive... very uniform, a bit conical...