Michael Aukett Architects has won planning permission for its highly contentious Croydon Gateway scheme, designed for developer Arrowcroft.
The decision comes as a hammer blow for Foster and Partners and CZWG, which have drawn-up controversial alternative designs for the 5ha site for Stanhope.
The London Borough of Croydon last week approved Michael Aukett's plans, which feature a 12,500-seat arena, despite Stanhope owning most of the land.
Arrowcroft chairman Leonard Eppel said: 'Extensive public consultation has confirmed overwhelming support for one of the most important strategic opportunity sites in south London.' Arrowcroft's proposal, in partnership with the council, includes a landmark 35-floor tower, 834 homes and 57,000m 2 of offices.
The council will now have to use its compulsory purchase powers to acquire the land from Stanhope.