" And it's pretty easy to do using a terrain. You just import a greyscale image which has a few squares on it of different shades and then tile the resulting terrain." That's good to generate the initial buildings, but they seem to be missing the "greeble" effect. Ie., widgets and things on the "rooftops" etc. Greeble basically extrudes the polys, but also adds micro-elements to selected faces.

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Tools :  3dsmax 2015, Daz Studio 4.6, PoserPro 2012, Blender v2.74

System: Pentium QuadCore i7, under Win 8, GeForce GTX 780 / 2GB GPU.