[bgumeny]

You definetly want buildings on the taller side, and make sure things are somewhat crowded together. If you want it to be like New York City, then the roads should be more or less a 90 degree angle, with some randomness here and there. Try throwing in a few little parks here and there, and try changing the way the buildings are designed every few blocks to give it a feel of different neighborhoods.

Btw, this might be better off in the levels section as it is not a playerworld of its own I don't think.