FRENCH firm Bouygues is up against Australian developer Lend Lease for the lion's share of the £4 billion Stratford City development in east London.
A consortium of Kier and house builders Gladedale and Bellway failed to make the cut.
The Olympic Delivery Authority and London & Continental Railways will announce the winner by mid-November.
Work starts early next year.
The deal covers the whole Stratford City scheme excluding the retail development to the south of Stratford International Station, which is being handled by another Australian firm, Westfield.
It also includes the London 2012 athletes' village, plus commercial and hotel developments and legacy housing.