Exterior :

Mix of BSP and modified photo scan models.

The wall, window, doorway and light fixture were modeled and textured using scan sources.

The rooftop was made of BSP and models from the library. 

The door model was created by prop team.  

Interior :

BSP based building structures using in-house game engine.

Blending and Applying materials from In-house material library.

Prop set-dressing.