*video* Are CityEngine-generated building models reasonably optimal in Unity?

hey folks, because I'm hoping to import a city from CityEngine, can one of you modeling wizards please tell me if the following model setup is reasonably optimal for Unity? There will be a LOT of buildings in my scene, so optimal would be really beneficial.

Because of the way CityEngine exports/merges models based on materials, with FBX, would the following setup be efficient and render well in Unity?

- separate elements of model (usually roof, walls) held together by a dummy
- open edges
- co-linear edges
- intersecting faces
- not at all watertight

You can see what I mean in this 1-minute video of a very simple building model I exported (for simplicity, I exported just one model... though CityEngine can generate many, many)

Thanks! ;-)