Hello @Zielak79
I would argue that the answers given thus far are not misleading, when the original question was "Maximum Storage and War Card Level?". If you find your city is easier to manage with only Capital City unlocked and 700 storage slots (+ any temporary storage from Mayor's Pass), you may choose to play that way. Whatever best suits you and your style of play.
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*Please translate future posts to English prior to posting in the English speaking forum, so that all may understand the point you're trying to make. Thank you.