Better you go to the office I think are some restrictions
Actually Nathaniel's reply is correct except for one thing if you are doing that kind of photoshoot all you have to do is go to the office and register that you are using those public areas for a photoshoot. That is all there is no cost.
Their website states that photo shoots are welcome, but if they are for "professional or commercial reasons" you should contact them for details on policies.
Look up photo picies on Website.
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