When you take a province the pillage pop-up gives a total of buildings destroyed, damaged and florins recieved.
What does a damaged building mean? Does that mean the building is lowered a tech level? Destroyed I take it means completely gone?

On another note. I wish there was an option for your armies to not pillage the buildings in a province, especially if all your units are elite. If they aren't going to break when the general or King dies then surely they can understand a 'Don't destroy anything' order before battle. It's sad to see my armies burn buildings that would take 50 years to replace late in the game for a few florins, when I could use the buidlings straight away. What good is an extra 3000 Florins when I have 300,000 already, preserve the Castle and Palaces instead.