For this week, we were using Cinema 4D to model buildings from pictures and then use the picture as the buildings texture. Using camera calibration and different views, I was able to simply model the building
Once you remove the background, you can then bake the building. Once baked it produces a texture net and this building can then be imported into other scenes (whilst preserving all textures, sizes etc). This allows you to easily drop your buildings into Unity and become an interactive part of the scene.