[Suicide Junkie]

* Facilities that degrade over time after death of a colony. I was playing a proportions game, and got a couple of cultural centers built, then a plague wiped out all of the population. Wouldn't those buildings remain standing for the 2 turns it took new colony ships to get there?

Plagues do tend to leave the buildings intact. All you have to do afterwards is decontaminate the area with a medical bay, and drop population back on it.