Denton Hall and Eversheds have lost out to a 15-partner firm on a property contract for the Greenwich Millennium Village housing scheme.
Westminster firm Campbell Hooper beat off a rival bid from 96- partner firm Denton Hall to represent a consortium - comprising Countryside Properties, Taylor Woodrow and land owner English Partnerships and Greenwich Council - setting up the 1,400 house development.
It is also understood that Campbell Hooper won out against 346-strong Eversheds.
A spokesman at Denton Hall admitted the firm bid for the business but refused to comment further.
Property partner at Campbell Hooper Helen Meyler acted for the consortium, while managing partner Martin Wright negotiated a loan facility from Midland Bank, which was advised by Norton Rose.
Wright, aided by Duncan Salmon, a litigation partner specialising in property, also acted for the consortium on a land agreement with English Partnership.