City of Ottawa, Section 3 - Designations and Land Use.

Section 3.4 - Central Experimental Farm
"The Central Experimental Farm is a National Historic Site and a cultural landscape of national historic significance as well as having significant local heritage value that contributes to Ottawa's distinct identity.
 It is owned and operated by the federal government as an active and operating agricultural research station, containing a complex of laboratories, research fields, offices, greenhouses and farm buildings, an arboretum, public gardens and museums. Many of those buildings and sites also have local heritage value. The Historic Site also accommodates part of the future campus of The Ottawa Hospital.(Amendment #214, July 17, 2018.)"

Amendment #214, July 17, 2018-Preston-Carling District Secondary Plan.
4.1.1. Station Area
"Centred around the Carling Avenue O-Train/future LRT station along Carling and Champagne Avenues, the Station Area will incorporate a wide range of transit supportive use and see the tallest buildings and highest densities in the entire District. A gradual reduction in height and density from the centre towards the surrounding neighbourgoods as well as Dow's Lake and the Central Experimental Farm will be necessary to provide the desirable transition."
"Exceptional architectural design will be required for all buildings to ensure the highest streetscape quality and to create a unique skyline that symbolizes the southwestern gateway of the future expanded downtown. Integration with the O-Train future LRT station will be required for buildings immediately adjacent to the Station. Opportunities for a nationally significant building will be explored on lands owned by the National Capital Commission south of Carling Avenue east of the O-Train/future LRT. The Station Area will be a priority area for public realm improvements as outlined in Section 5 of this Plan."
Southwest Quadrant
j. High-rise and mid-rise mixed use development up to a height as detailed on Section B of this Plan may be permitted on the federal government property located south of Carling Avenue and north of Prince of Wales Drive. (Emphasis mine - A.C. savecfbrockcliffe.)

The Sky, 845 Carling Avenue in Ottawa. From Skyscraper Forum, March 27, 2013. This drawing was created before the Ottawa Civic Hospital pressured the National Capital Commission (again) into giving them federal land for a new health care facility.