Bryan Singer has tweeted a new photo:
It seems that it could be the practical set for the model that he tweeted a little less than a month ago:
No word yet as to what this building is. Speculation is this is Xavier’s underground facility and that is the most likely bet at this juncture. It will depend what these walls get painted and fitted with. If it’s shiny grey, then we have our answer.
X-Men: The (fan fic) Series 
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