To store all your buildings, go to the Kingdom Editor view and look for the "Store All" icons in the bottom corner of the screen.

You can store all of your buildings, or just buildings of a certain type (like Attractions). Change your selection by selecting a different section tab to the right.

You can store buildings from only one zone or from your entire Kingdom.

Make sure you collect your Magic or event currency before storing your buildings, since uncollected rewards are lost when you store a building!