I had an old save of Tarraco from the CCK maps which ran 40-plus years and had a population of a little over 11k. It was sort of a pick-up game, with no specific goals and no over-all plan. I wanted to see how much bigger and better I could make the city using the old save as a starting point. The basic rule I set was that I could not move any of the existing housing blocks. Everything else was subject to a makeover.