In 1997, Lastman's position was abolished when the provincial government under Mike Harris amalgamated North York with Scarborough, York, East York, Etobicoke, and Old Toronto, creating a single-tier "megacity" forming the new City of Toronto. Lastman ran for the mayoralty of the "megacity" against incumbent Toronto Mayor Barbara Hall. Lastman's electoral victory was credited to his very strong base of support in the suburban cities, namely North York as well as in Etobicoke and Scarborough. Hall had won the majority of the vote in old Toronto, York and East York.