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I'm not sure how many others have been to the new observation deck at liberty place, but one downside is that the glass can get pretty dirty- and I don't think the window washers can get that high on that building. It may seem like a minor issue, but when you consider what they are charging it's a bit disappointing to see a layer of grime on the windows which was bad enough to actually affect photo quality. Hopefully it's much better after a rainstorm.