Supreme Court hears Ontario Place Case
On October 15, 2026, the Supreme Court of Canada heard the case pitting Ontario Place Protectors against the Government of Ontario. The case raises issues around the limits to which a government can shield itself from accountability in the courts and whether there is a “public trust” that protects significant heritage places, even in the absence of legislation.
A considerable engineering feat, Ontario Place was considered a futuristic architectural marvel when it opened in 1971. It was designed by one of Canada’s most notable landscape architects, Michael Hough and RAIC gold medalist, architect Eberhard Zeidler. The landscape, dome and its monumental interconnected mast-hung pavilions formed a singular cultural landscape that expressed the avant-garde architectural ideas of the time. It was put on the National Trust’s Endangered Places list in 2012.
The Supreme Court agreed to hear the appeal after the Ontario Court of Appeal decided against Ontario Place Protectors, concluding that the Rebuilding Ontario Place Act (ROPA) had not exceeded constitutional limits and that there is no “public trust”. All nine justices on the Supreme Court were present for the day of oral arguments, indicating that the questions are significant. The court documents are available here: Supreme Court of Canada | 41805
In the court room, lawyers for OPP and the Government of Ontario presented their cases at length, interrupted only by pointed questions and comments from the justices. In addition to the two parties to the case, nineteen intervenors also spoke. These intervenors included six attorneys general, two First Nations groups, civil liberties associations, environmental groups and the city of Toronto.
The National Trust also intervened in the case, as part of a coalition of intervenors with Ontario Place for All, Toronto Field Naturalists, and Democracy Watch. We were ably represented by Jackie Esmonde, a partner at the law firm Cavalluzzo. You can read our joint press release here: Coalition intervenes at Supreme Court of Canada in case challenging Ontario government’s destruction of Ontario Place – National Trust for Canada
Our position is that ROPA undermines the public’s ability to ensure that Ontario Place is redeveloped in accordance with its heritage value. Certain cultural or natural resources are so important that government should protect them for the public’s benefit, whether or not there are specific heritage laws in place.
Ontario Place Protectors, a small coalition of concerned citizens, deserve enormous credit for taking this fight – which will have implications for thousands of historic places across Canada – through the courts. Options to donate to the legal defence are available on the Ontario Place Protectors website.
At the end of the long day of oral arguments, the Supreme Court reserved judgment. No date was set for the release of a decision.
