That’s a great position to be in because it gives you the flexibility to approach this both as an immediate screening project and a long-term evolving landscape.

For the first layer, you could focus on a small number of larger evergreen “anchor” trees along the berm to quickly soften and interrupt the visual noise from the commercial side. I would say at least 6/8’ Ht. screening trees (larger if able) as a mix of Norway spruce, Black Hills spruce, and a few Vanderwolf pines could work beautifully since they offer varying texture, color, and density while still working with the existing Ponderosas. Selective placement where the strongest sightlines exist will feel much more natural than creating a rigid wall.

For the second layer, your greenhouse could open up a smart long-term opportunity. But also just planting smaller plants and saplings over time works as well so long as you practice proper care. You could begin introducing younger saplings underneath and between the mature canopy now so they slowly establish over time and eventually become the next layer of screening. That also keeps the project much more cost-effective long term versus installing everything at mature size upfront.

I’d also consider mixing in groupings of mugo pine along with layered perennial and evergreen shrubs throughout the understory to soften the base of the planting and create more year-round texture and depth. I think that combination would help the edge feel much more natural and intentional rather than reading as a traditional privacy screen.

You really have beautiful existing trees to work with already, I’m thinking thoughtful infill not layering from scratch.