Modeling A City: Start In 3D App Then Move To UE4?

I’ve been trying to get my head around this for nine months (literally). I’ve posted all over the place, but I never get an answer that answers my question.

Imagine you’re making a city in GTA for example. Would you model everything out (as a whole) in Maya, then start breaking that down into modules and importing it into Unreal? What’s the process of building an urban environment look like?

Thanks!

i think you should model like the buildings first piece by piece. Thats me tho

Thanks guys. I guess maybe I didn’t explain this well enough. I totally understand the modular part (or making each building one by one), but I don’t understand streets/pavement/sidewalks. Do I make my roads/sidewalks modular, too? I could make a standard sidewalk block (modular on a grid), but how do I account for changes in the terrain (slopes/inclines, etc)?