I found this video on you tube: http://www.youtube.com/watch?v=KGQJ-Own2bw
Between 6:33 and 6:44 it links to this place: http://skeleten.awardspace.com/
There you will find all 3,000 codes to get maximum land value on the entire map. Using this, the zones will not be built already developed, but all zones will reach its highest level of development. I am not sure if this is what you where looking for.