General Motors to expand the Renaissance Center

General Motors Co. says it's expanding and renovating its downtown Detroit headquarters.

The automaker announced Friday that upgrades to the Renaissance Center will include a multi-storey addition and a large, LED video screen that wraps over the People Mover station in front of the building. It's also adding a GM retail store and other interactive displays.

Construction is expected to start this summer and finish in 2018.

GM completed a major renovation and expansion about a decade ago that focused on the side of the center facing the Detroit River.

The complex, which includes a hotel and Detroit's tallest building at 73 stories, opened in 1977. GM bought it in 1996 and moved from its historic headquarters in the city's New Center area.