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Obtaining these buildings is a though job. At the moment you can only get them from Mystery superbuilding. You buy it regularly for 99 greenies, 69 discounted price from Duke and 19 only during sale. You receive a box with a hidden building and if you have good luck, you can get few valuable ones (both you mentioned and Astro Academy, Ski Resort, Tree of Life and few more - I can't recall the others however).

If you are interested, check in wikia what could contain each of the 4 Superbuildngs boxes.