Here's a wild idea to do about all them defunct, unowned buildings that will go kapoof when reclaims happen. Blighted homes. The homes become blighted from disuse and start wandering around attacking players (animated buildings) The power of the animated building would be dependant on the tier of building it is. Once destroyed, it would random choose what harvestable resource you could reclaim from it.
This would only happen to buildings that are being reclaimed and are not open to public or guild use.