This is not really a bug, but I think there is a specific situation that should be avoided in city building distribution, and it's the 3x3 building blocks (actually 3xN, where N>=3). That kind of blocks make the middle tile(s) to be bareland for ever; I use to build there small parks or monuments, just to avoid the s**k-looking effect of the middle tile empty. Any ideas or workarounds to this problem?
Personally I think it's easier to fix the empty inside ;)