Metro Hall was opened in November 1992 to serve as headquarters of the Municipality of Metropolitan Toronto.

In 1988, Metro changed from a confederation of area municipal governments where councillors had been chosen from and by the councils of the area municipalities and had their offices in the local offices, to a clearly separate level of government with directly elected councillors.

It was expedient that Metro Council have meeting space and councillor offices in the same building and away from any of the area municipality offices.

Also it had been demonstrated that housing Metro staff, then scattered over many buildings, in one central headquarters would be more cost effective.

Metro Hall was built with the latest in energy conservation measures and features to accommodate people with disabilities.

The ground, second and third floors are public areas, while floors four to twenty seven house some City departments.