The government of Canada cannot sell the Central Experimental Farm or the Lebreton Flats.

Bill C-37 An Act to Amend the National Capital Commission and other Acts.

 House of Commons Canada  Evidence - TRAN (40-2) No. 32. October 26, 2009. Mr. Jean-Paul Murray (Co-Chair, Gatineau Park Protection Committee)"The government established the National Interest Land Mass in 1988 following a recommendation by the Nielsen Commission that it curtail the National Capital Commission and impose a managerial discipline on its real estate transactions."

The Farm and Lebreton Flats are National Interest Land Mass properties. They will be owned by the citizens of Canada forever.

MP Marcel Proulx - "In Bill C-37, Clause 10-4 deals with environmental stewardship. We want to change the wording. We're saying that the NCC in priority must maintain the ecological integrity of the commission's real or immovable property, such as the greenbelt in Ottawa and all lands of national interest described in section 10-2."

40th Parliament,2nd Session - Legislative Summary of Bill C-37: An Action Plan for the National Capital Commission .

"On 9 June 2009, Bill C-37, An Act to Amend the National Capital Act was introduced in the House of Commons by the Honourable Lawrence Cannon, Minister of Foreign Affairs and Minister of State, for the Honourable John Baird, Minister of Transport, Infrastructure and Communities."

Clause 10 of Bill C-37 - The National Interest Land Mass.

Federal politicians John Baird and John Manley want the Lebreton Flats to be preserved as an Urban Park similar to Central Park in NYC and London, England's Hyde Park. CBC article: 

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House of Commons Debates Ottawa  November 29, 2004. Hon. Sarmite Bulte (Parliamentary Secretary to the Minister of Canadian Heritage.) Liberal. "The ... greenbelt was designed in 1949 to prevent urban sprawl and to provide open space for the future development of farms, natural areas and government facilities. Today the greenbelt's 200 square kilometre crescent of farms, forests, natural areas, recreational facilities and public and private research facilities provide the capital with a rural landscape that is unequalled in any other North American city. ...The greenbelt includes National Interest Land Mass properties which are held in the national trust." more...

A March 19, 1954 Government of Canada Cabinet document.