Allies and Morrison has brushed off challenges from John McAslan & Partners and Ian Ritchie Architects to win the commission for a new flagship office and broadcast centre for the BBC.
The job, at White City, is thought to be worth in excess of £100 million and is the largest single commission the London practice has ever received.
The selection was announced this week and marks the end to a controversial competition which last month saw the BBC scrap an original shortlist of EPR, Aukett Europe and RMJM and rush through a new design competition.
The development will provide 60,000m BBC which is running out of time to find extra space. The lease on the World Service headquarters at Bush House expires in less than five years and new director general Greg Dyke is already pushing through expansion plans for TV and online services.
The BBC already owns a 1.8ha site at White City next to the existing BBC building designed by Scott Brownrigg & Turner. Morrison said that his practice is likely to design a number of different buildings on the site and plans to integrate the existing facility.
BBC director of property Ian Robertson said: 'I'm delighted that Allies + Morrison will be joining us on this high-profile development. This is one of our first opportunities to implement our new property strategy, 20/20 Vision.' As part of this strategy, the BBC is appointing a property partner to help inject £300 million into its 522property portfolio.