New condos may be constructed on the Central Experimental Farm Ottawa.

From: The City of Ottawa website that provides information about zoning changes.
Application #D01-01-17-0016 - ZONING BYLAW AMENDMENT
520 Preston Street, 930 Carling Avenue - Official Plan Amendment - No Appeal. Adopted July 16, 2018.

 12.3553 acres of Experimental Farm land has been rezoned as a General Urban Area by Ottawa City Council.
    "Description - The purpose of the amendment is to facilitate the use of the selected site for a new Hospital. The amendment would remove approximately 5 ha. of land designated as Agricultural Research Area within the current Central Experimental Farm boundary and designate these lands as General Urban Area. It is also proposed to amend the Preston Carling District Secondary Plan to create a new "Hospital Area" designation for the entire hospital site. The new "Hospital Area" designation will contain key policy direction to guide the future direction of the Ottawa Hospital."
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     This is what the zoning term "General Urban Area" means in this city:
     Policies- 1.) General Urban Area designation permits many types and densities of housing, as well as employment, retail uses, service, industrial, cultural, leisure, green space, entertainment and institutional use.

4.)  The General Urban Area permits uses that may generate traffic, noise or other impacts that may have the potential to create conflicts with the surrounding community. These types of uses are often large and serve or draw from broader areas.
     General Urban Area designation permits the development of a full range and choice of housing types to meet the needs of all ages, incomes and life circumstances, in combination with conveniently located employment, retail, service, leisure, entertainment and cultural uses. 
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Perhaps an apartment will be built for medical students or a high rise hospice will be created. I am sure that many ideas have been floated around to make the presence of residential towers on the Farm palatable. Then in a few years an entity such as Ottawa Community Housing will buy one of the buildings. A federal Crown corporation called the CMHC built many subsidized housing communities, for example Regent Park in Toronto. Then Regent Park was sold to Toronto Community Housing.
The Experimental Farm and the Dominion Observatory are National Historic Sites of Canada, but that does not preclude the construction of office buildings and subdivisions on the land. The Skyline Towers on 1400 Merivale Road Ottawa were federally-owned until Larco Investments (Chateau Laurier) bought them in 2007. The buildings are classified as "low rise" by EMPORIS. The Clyde/Merivale Experimental Farm land was sold to the Municipality of Ottawa in 1988, then to a private businessman who created "Central Park".
 People from all over the world wrote letters to the National Capital Commission imploring the federal Crown corporation to "Save the Central Experimental Farm", see the 2017 YouTube video "Ottawa prepares to hand over Historic Federal Farmland to corporate developers".