The third phase of the Cardiff University post-graduate project includes a new translation facility, and innovation centre with a new pedestrian bridge connecting the centre to the existing business school.
Kier has carried out pre-construction work on the project but decided not to proceed with the main design and build contract.
Several contractors including Sir Robert McAlpine were also in the bid race but it is now understood Bouygues is favourite to sign a deal.
Architects HawkinsBrown and HOK have worked up project designs alongside site masterplanners BDP.
Arup delivered M&E and Jacobs structural designed for the development which been designed to achieve BREEAM Excellent rating. The associated works include sewer systems, landscaping, infrastructure and enabling works.
The bridge proposal comprises a 30m long single span virendeel truss system, with stairs and dual access lift at each end.
It will terminate in Exchange Square, a large public open space, at the heart of the Innovation System Campus, east of the Innovation Centre Building. To the west it will terminates the existing Business School car park.