The Masdar Headquarters building will produce more power than it needs (an energy positive building). In fact, the solar roof (one of the largest in the world) will be constructed first, and it will power the construction of the rest of the building. The video link on this page has a great view of the sun-infused interior.
The 1.4 million square foot building was designed by Chicago architecture firm Adrian Smith + Gordon Gill.
It will serve as the centerpiece of Masdar City, which will end up being about a $22 billion development in Abu Dhabi
Masdar Headquarters will have the lowest energy consumption per square foot, it will feature the largest photovoltaic system and also the largest cooling and dehumidification system. This building will also consume about 70% less water than a typical mixed-use building of its size.
The building will have integrated wind turbines and outdoor air-quality monitor and the construction will be completed by the end of 2010 and while the entire city will be finished by 2016.