Hi, i took a look at your scene just to be sure, and here is a few hints:
1, Poor modeling... i have merged scene into new one, with just bright gray material, to minimize any setup errors. I have removed sky and any lights, and left there sun only. As you can see on the picture attached below, your geometry is leaking somewhere, so the modeling is not perfect. You should always make sure your interior is air-tight so no light can leak through.
2, Albedo... As keymaster already mentioned, you should not use superbright materials... Materials with value over RGB 220 220 200 appear only very rarely in nature.
3, Your scene was very far from origin. Do not do that, always have your scene as close to scene origin as possible, to avoid problems...
4, It seems that some of the content you uploaded with the scene is copyrighted, such as models and textures. Never upload copyrighted material publicly anywhere, because you could get in serious problems with the companies that created this content.
After cleaning it up, and sealing the holes in the model, everything works properly.
