Hmm, I don't think it's a Leyland either. I'm familiar with those problem children. My Leyland monsters are pretty bullet proof, so I left a couple in place since nothing else grows where they are and they thrive on brutal neglect - full sun & never get water all summer etc. And I haven't had to look at my neighbors since. All the others I removed over time. I must say, I never had a more durable tree but I can't stand how they break when it snows. Mine got enormous fast! Biggest one before I decided I made a mistake was 40% taller than the utility poles and I topped that one several times. That just seemed to make it mad and I think I heard a voice in the wind saying, "Challenge accepted!"
They make a beautiful hedge if you have extra time to trim. They also gum up the electric trimmers pretty badly.
So, these I'm asking about have never been trimmed to my knowledge, so I'd hoped the shape would be key perhaps? Has that low wide pyramid shape. All the ones I've seen around town are similar. They're a lush deep green after new growth matures. The younger ones like these are fairly tight, conformed and very dense, not whispy at all like Leylands can be. I've seen some that were trimmed around the bottom that seem to take well to that. No brown dead areas if kept that way normally. Medium growing too, not a real fast grower like Leyalnds or Grn Giant Thuja. I keep looking for abig mature one. more tree like. But have yet to spot one. Maybe they change enough to look different or they just don't get that big? I think around 25ft is the biggest I've consciously acknowledged. And about that wide too.
I have Grn Giant Thuja's also so I know they aren't those. These do have that scale leaf like a Cedar. Grows in a more upwardly direction and as the limbs get heavier they settle outward. But new growth typically aims upwards. Things like Arborvitae and Green Giants seem to grow more directions. The mystery tree does have that Cedar or Thuja smell if you crush them.
Thanks for your patience. I'm just trying to zero in better for anyone reading. Really appreciate the feedback!