Torre PwC

The Torre PwC, formerly known as Torre Sacyr Vallehermoso, is a mixed-use skyscraper located in Madrid, Spain. Built between 2004 and 2008, the tower stands at 236 m (774 ft) with 52 floors and is one of four buildings in the Cuatro Torres Business Area. It was designed by Carlos Rubio Carvajal and Enrique Álvarez-Sala Walter and was built by Sacyr Sau. It is the only tower with double skin facade and it is covered entirely of glass in the form of flakes. On the upper deck there are 3 wind turbines, of 2.5 kW each, capable of producing wind energy for use in the building.

Building data from Wikidata (CC0); heights normalised. Summary from Wikipedia (CC BY-SA).