Building a complex city scene for a final build rendered to a PC(desktop only).
Whats a practical upper limit in terms of vertex count, or faces, per scene in Unity?
Don’t limit yourself on verticies. Based on your shaders and materials, a vert from one object can be 50 times more expensive to render than a vert from another.
Also, make sure you use the quality settings under Edit->Project Settings. You can have multiple graphics levels so if your game runs too slow on a computer, you can just lower the graphic quality level.