The National Capital Commission has the power to veto the Chateau Laurier addition.

Confederation Square in Ottawa, Ontario. (Photo is from Library and Archives Canada.)

1993-1994 NCC Annual Report- Executive Summary - Page 9 of 36.
Mission Statement - The NCC's mission statement reflects it's mandate:

• to use the Capital to communicate Canada to Canadians;
• to make the Capital a meeting place for Canadians; and
• to safeguard and preserve national treasures in the Capital.

1994-1995 Annual Report of the National Capital Commission - Page 19 of 50.

Too many modern cities have paid the price of uncontrolled and disharmonious development. That is why Canada's Parliament appointed the NCC to guard against inappropriate design and land use in the Canadian Capital. The Commission has been authorized to examine all applications for design approval, land-use changes, realty transactions and demolitions affecting federal property in the region, rejecting those that are inappropriate or suggesting changes to make others acceptable.