According to a front page article in Ottawa Citizen published on Thursday, February 28, 2013, US stone is going to be used for the extension that is being made to the Macdonald building (former Bank of Montreal building), rather than stone from Canada. On March 8th, the WHM board of directors wrote a letter to Rona Ambrose, Minister of Public Works and Government Services Canada suggesting that the government use Queenston Limestone from Niagara-on-the-Lake.
You can read the complete letter on our website. Letter to Rona Ambrose: Re. Macdonald Building