A Pomerleau-Canam Group joint-venture has finalized a $729-million contract to replace Montreal’s Olympic Stadium roof.

CBC reported that the contract was signed in late February. Pomerleau and Canam announced in early February that they had been hired by the Quebec government, which has budgeted $870 million for the project.

Plans call for the two Quebec City-area-based companies to remove and demolish the stadium’s decaying roof and then build and install a new one.

CBC reported that the joint-venture will be responsible for annual roof inspections and repairs for 10 years. The new roof will contain a clear glass top to allow for natural light during the day and views of the stars at night.

The project is slated to be completed in three phases over a four-year span. Canam will added a sixth sports amphitheatre to it project portfolio, said Marc Dutil, the company’s president and CEO.

Built for the 1976 Summer Olympics, the stadium is known as the Big O and Big Owe due to cost overruns associated with the venue and those Games.