Oh.. In the guide posted earlier in this thread.. Actually I repost the link here: http://db.gamefaqs.com/console/snes/file/simcity_b.txt
The guy is talking about a donut shape but minimalized. He builds residentials and then buldoze some of it. Then he places new residentials and do the work all over again. My question here is.. Does this method equal a regular strategy? I mean.. Can you fit the same ammount of people in the buldozed houses as you can in a regular house? Will these houses be able to change into tops as well?