In 1977, the stadium replaced Jarry Park Stadium as the home ballpark of the National League's Montreal Expos. As a part of the team's franchise grant, a domed stadium was supposed to be in place for the 1972 baseball season. However, due to the delays in constructing Olympic Stadium, until 1977, the Expos annually sought and received a waiver to remain at Jarry. As late as January 1977, it was thought the Expos would have to play at least part of the 1977 season at Jarry as well. The Parti Québécois' landslide victory in the 1976 provincial elections caused the Expos to break off lease talks. However, an agreement was reached in February, and an official announcement came in March.