Most of them are working in a more subtle way...but they work (Fig.30).
I used an area shadow here. This allowed me to get a little more definition on the surfaces of the right building (Fig.31).
Bouncing Lights at the Right Window
To add an extra level of realism, I positioned three square spots pointing to the side, top and the bottom of the window on the right side. This creates the illusion of a more convincing light coming from inside the building. Cinema 4D allows the possibility to scale the form of the light object along the axis. So I created a kind of rectangle. Because of the fact that I wanted to add this extra illumination to a very limited area only, I used the include option in the attribute menu.
While creating this setup I added the same bouncing lights to the other windows but due to the cameras point of view you'll see no difference. I therefore decided to drop them out of this set again. (Fig.32 - 34).