Today, the Royal British Institute of Architects (RIBA) announced Foster + Partners’ Bloomberg headquarters in London as the winner of this year’s Stirling Prize.  This is the third time that the London-based firm has received the prestigious award, which recognizes the best building in the United Kingdom based on design vision, innovation, and originality. The firm last won the prize in 2004 for the bullet-shaped skyscraper The Gherkin.

The project, which comprises two buildings connected by bridges, features a sandstone frame consisting of protuberant fins with built-in vents. Spanning over 3.2 acres, the 10-story headquarters has been credited as the world’s most sustainable office building, and it is rumored to be the largest stone building in London next to St. Paul’s Cathedral. The facility was also a recipient of the RIBA London Award, which celebrates architectural excellence in England’s capital.