BBC: "Tomorrow's buildings: Is world's greenest office smart?"

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"The Edge office building in Amsterdam prides itself on good coffee, lots of natural light - no desk is far from a window - and a gym that allows you not just to get fit but also to contribute to the energy supply of the office.

"It also flushes its toilets with rainwater, has a robot security guard that will challenge you if you wander around at night and a whole range of clever technology to make the building sustainable.

"The developers behind it, Dutch firm OVG, liked it so much that they moved in when it was finished.

"So is the office that has already been dubbed the world's greenest, really as smart as it seems?"