The idea of being able to see everything built in your village by list. On this list you would be able to see what level your items are and how much it will cost for the next level (if it is maxed for that TH level then state need TH level X for next upgrade). You could group similar level items the same way they are on the Village Edit mode. This way you can see everything that is maxed out for that TH level and everything that still needs to be upgraded and what price they will cost. That will help out instead of having to check each building to see if it is able to be upgraded and what they cost for their next upgrade.
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