table will come here http://www.tkoc.net/wiki/index.php?title=Buildings
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Available after the knowledge Mining.
Available after Metal Working combined with Trade.
Available after the knowledge Metal Working.
Available after the knowledge Trade.
'Will I lose my thieves/wizards when destroying my inns?'
No, you will not lose your thieves or/and wizards when destroying your Inns, Wizard Towers or Docks. However you will lose your bonus and you cannot retrain them again. Until you make room again for them.