So I just created my first real level from scratch 
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I went a bit further and placed some more lights, props and 2 windows (including the glass :-))
It went awesome.
I also copied the chair material and placed it in my own folder for inclusion in source control 
The only thing I don’t know how to get rid of is the weird lighting differences on the walls. You can clearly see the switch between the different wall blocks because the walls look different, but its the same material.
In this screenshot you can clearly see what I mean:
Anybody know how to get rid of it?