The chrysler building in PE is only available during the second playthrough in the game, it's unlocked in the Second Day, when you have access to the NY map. But I only recommend you going there after you defeat the T-Rex on the museum at the Fifth Day, since the enemies there are hellishly strong, and the bosses are stronger than the final boss of the game. Also, the final boss at the top of the Tower was trully a shocker xD
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