It is available for free when placed during the Missing Mystery Goal and takes 5 Energy to build. Once placed, it allows an extra 100 Population. Collecting from this every 24 hours will give the player 250 Coins. This is the same for all levels.
Upgrading this to Levels 2, 3, 4, and 5 requires the player to be at Levels 4, 6, 8, and 10 in CityVille 2, respectively.
With the closure of CityVille 2 on March 8, 2013, this is no longer available and may not be upgradeable anymore.