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The Tower, unlike the majority of buildings, does not benefit from the Hit points bonus granted by Large and Major Cities.
After reaching the Gunpowder / Enlightenment / Modern Ages, the Tower would automatically use the Keep / Stockade / Bunker models, even if the required Military technology was not researched yet. However, such a change would only be visual, as the name and the stats of the building would remain unchanged (except for Romans, whose Tower-type structures would actually upgrade without meeting their standard Military research prerequisites, which is granted by the undocumented feature of the Power of Caesar).