'nevets2001uk' asked how i go about creating a building and the level of detail used. Here's a brief explanation.
I start with the area I'm going to build on and start slicing it with the knife tool, creating the outline of the building\/.
Then I extrude the outline of the building up from the plane\/.
I apply a texture to the facade\/.
Continue extruding the building up as I texture it, making sure everything is to scale. In this instance this portion is 1 floor lower, so i use the texture as a guide to it roof height\/.
Add details like services on the roof\/.
And the final building finished. The whole thing probably took about 10-15mins\/.