I guess that would not be too hard mike. Draw 4 different buildings, make sure their perspective points all end on the same horizon and then paste them over and under each other. DONE!
Per object, they use an individual 2 point perspective, where only the (in real) horizontal lines are parallel to each other. Thats why you would only need to place them right on the horizon, and you can drag everything horizontally (not vertically) around as much as you can. Draw some more buildings, fill up the gaps, think about general tiling stuff and tadaah, you are done.
I really think it would not be that hard.