Carillion has signed a contract with the Homes and Communities Agency for an £80m regeneration project in Leeds.
The new Tower Works scheme will include 90,000 sq ft of commercial space as well as 24,000 sq ft for restaurant and residential use.
A masterplan will be submitted for planning shortly, with construction to begin on site in spring 2016.
In July, Leeds City Council chose Carillion as preferred bidder to develop the listed Engine House complex at the centre of the Tower Works site, which will form part of the overall masterplan.
Carillion chief executive Richard Howson said: “We are very pleased to have signed this contract with Home and Communities Agency, having worked closely with them and Leeds City Council on this important regeneration project.
“Together, we have developed a vision for the regeneration of one of the most important landmark sites in Leeds that will create a sustainable community which meets the aspirations of all stakeholders.”