This is a city I made with the intention of making a min of 2-3 Palace Blocks. I then expanded as I had a very stable support system in place. I tried for a 5th, but that one took a couple hours to get stablize. Part of the problem was aging popultion, that I kept fighting to keep up, by adding more worker housing. Then I reached the walker limit, which was causing more problems. So I had to fix that. Overall for now, the city is stable.