Warhammer Online: Age of Reckoning Interview

Gameplanet offers an interview with associate producer Josh Drescher, talking Warhammer Online.
GP: We learned more about city sieges in Warhammer Online in Singapore this year, but our readers wanted to know what happens after you have eventually booted out your invader. Is it a complete rebuild from scratch, or do some of your previous achievements remain standing?

Josh: It depends on how successful the invasion was. Our Living Cities have five levels of content in them that enemies can destroy during an invasion. So a Rank 5 city that is invaded might only drop to Rank 4 if the invasion isn't successful in destroying enough parts of the city. It's also possible that it will be knocked all the way to Rank 1 by a very successful invasion.
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Once an invasion ends, you have to rebuild from whatever point the city was reduced to though we never allow core functions like trainers, merchants, etc. to be destroyed.