It originally served to house the regulatory body for lawyers in Ontario along with its law school, formally established as Osgoode Hall Law School in 1889, which was the only recognized professional law school for the province at the time. The original building was constructed between 1829 and 1832 in the late Georgian Palladian and Neoclassical styles. It currently houses the Ontario Court of Appeal, the Divisional Court of the Superior Court of Justice, the offices of the Law Society of Ontario and the Great Library of the Law Society.