Swansea Council has appointed the contractor to complete detailed designs and market testing for the five-storey development, which will house up to 800 workers.
The project, part of the wider regeneration of the St David’s site, will see high-quality offices above ground-floor commercial space for food, drink or leisure.
The council will occupy one floor, with the remainder let to public and private sector tenants. Development partner Urban Splash and manager RivingtonHark are also on the team, with Swansea Council retaining ownership of the building.
Designed by shedkm, the scheme will feature a blue roof for urban drainage, an intensive green roof to boost biodiversity, and PV panels to cut carbon emissions.
Construction is due to start in spring 2026, finishing in summer 2027.