These are boxwood shrubs at first glance. Consider sending a photo of just one clipped stem, so leaf shape and arrangement is clearly visible. Or, check out these resources and see if my guess is correct.
OSU landscape plants page, with cultivar listing on the right. Photos for ID will be helpful. https://landscapeplants.oregonstate.edu/plants/buxus-sempervirens
You’ll find information online about pruning boxwood. This one from U of Maryland is a good one, https://www.youtube.com/watch?v=3i8mcoKapeY
This is Buxus, commonly called boxwood. They are usually gown as a low hedge. Perhaps these were going to be kept sheared as tall pillars. You’ll be able to reshape them as you desire.