You can get the Embassy in the in-game Shop in the tab with a house with a star depicted.
The building gives you an opportunity to create your own union that is suggested to do when you press this object constructed on your Island. The Embassy also allows to follow your union news, invite friends, check requests from other players, communicate using the chat, see your points and the items that can be obtained for them, participate in the events. To do that, just press the Embassy on your Island, tap on the To the Union option and use the relevant tabs at the top of the union window.
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