@pokoy
You're right. I always need to fake something. What I try to say, that if I know how it is working - I know how to fake things.
BTW the new PBR tutorials of CoronaTeam is very understandable, but doesn't help in my particular case. I think that with new level of renders we'll have options to fake less and less. :)
"If the material on the balconys' ground is reflective - disable reflections, so more light can bounce off from the diffuse part of the shader." - Must to test this. Never thank this way :(
Edit: I tested it. With dark materials no different, with bright - reflection adds more light in surrounding. As it must be by logic.