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They haven't built the new one yet; they could always make it bigger. Even simply thickening it would likely add a ton of space.

It would also darken the building and require more artificial light, which it seems they're trying to avoid.

They could always use skylight tubes [1]

Or, if they really wanted to go green... [2]

[1] http://www.solatube.com/commercial/index.php

[2] http://www.youtube.com/watch?v=_zMAWztZ6TI

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