At the end of the Challanges, if one is a VIP. Fire House!
That being said, I have decided that from here on out, I am keeping the buildings I get from MS/leveling up and any others will be evolved. Or, at least that is what I am hoping to do. 
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Remember if you like unique buildings (like I do) then be sure you don’t sink them into monuments. They are not in the Building menu so you can’t replace them if you do that.
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Exactly what I was thinking!
I have looked ahead to see what all I will be acquiring in the next few MS, which is why I made my comment about evolving some. A thought…group the ones I get from MS together…
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