Suggestion[]
Make the building articles do something somewhat like the {{itemtip}} or {{faction disambiguation}}. The tabs will be something like: Level 1, Level 2, Level 3. This is obviously for the buildings that can be upgraded. --— Surafbrov T / C 06:59, 25 May 2014 (UTC)
Reason: Each upgrade seems to have more stuff available for that specific building, and especially the appearance changes differently. I'd personally like the way the {{itemtip}} was designed. How I picture it: Clicking each tab only changes the infobox information and pictures of whatever level chosen. Everything else on the article remains the same. — Surafbrov T / C 16:41, 25 May 2014 (UTC)