Countryside Properties has been appointed along with London and Quadrant Housing Trust (L&Q) to deliver a housing development in east London.
It is understood the two developers have been selected by Mayor Boris Johnson to lead the regeneration of Beam Park.
Plans for the former Ford factory 29 hectare site include building over 3,000 homes, a new train station on the C2C line and community facilities.
Richard Cherry from Countryside Properties said: "Countryside and L&Q are delighted to have been selected for this hugely important scheme which will spearhead the regeneration of the London Riverside Opportunity Area.
"We look forward to working with the GLA, the London Boroughs of Barking and Dagenham, and Havering to transform Beam Park into a well-connected, sustainable place for people to live, work and socialise."
The project is one of the last 414 hectares of land transferred to Mayor Johnson that have all been released for development.
(LM)
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