When you look through windows from inside some buildings, the occlusion culling sometimes hides buildings / props that should be visible through the windows. This happens especially with some of the newer industrial buildings that have been added in the game.
Here are some instances of it happening:
Cherno industrial building:
http://www.pic-upload.de/view-31001987/20160617213748_1.jpg.html
http://www.pic-upload.de/view-31001986/20160617213746_1.jpg.html
Located here -> http://www.pic-upload.de/view-31001964/chernolocation.png.html
Electro large school building:
http://www.pic-upload.de/view-31001996/20160618205811_1.jpg.html