These trees are a columnar beech tree called Fagus sylvatica 'Dawycii Green'. They are really versatile and great for privacy in tight urban spaces.

Thank you, thank you. I really like these trees and would love to have a look at the rest of the planting that I can't see. It is so much like my yard with a new fenced area that is difficult to design the landscape. I had a design done but am not happy with it after two summers. Thank you so much if you could reply to this. Margaret