Just picked up the game recently and was playing it this weekend. I have one question to those that have played this. When you lay the High Density Commercial zone and High residency zone down they say that they'll sometimes generate high rises and skyscrapers. I have yet to see this happen. Are you supposed to do something special to get them to show up. I have big cities of almost 20,000 people but there completely flat. A few apartments and such but no high rises.