What is the name of building where premier Dalton McGuinty works?

The name of the building where Premier Dalton McGuinty works is the Ontario Legislature Building, also known as Queen's Park. It is located in Toronto, Ontario, and serves as the seat of the Legislative Assembly of Ontario, which is the provincial parliament of Ontario. The building houses the offices of the Premier and other members of the provincial government, as well as the Legislative Assembly Chamber and other legislative facilities.