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I was wondering the same thing. Between the Broadway condos, Ultima, and 5000 Yonge the Performing Arts' block is complete. It can't be to the North because the Board of Education, NYCC, and Mel Lastman Square are there. It's not to the South because the Madison Centre takes up the whole block. The West is out because that's the cemetery. My guesses are that this is either an addition to the Performing Arts Centre, or it's somewhere on the East side of Yonge.