The government of Canada and historic properties.

The Chambers Building is located on 40 Elgin Street, Ottawa and is part of the Confederation Square National Historic Site of Canada.
Confederation Square monuments and landmarks.
The National War Memorial and Tomb of the Unknown Soldier.
National Arts Centre
Chateau Laurier Hotel - sold to the Canadian Pacific Railway. The hotel is a National Historic Site of Canada.
Central Chambers
Government Conference Centre - Also known as a Grand Trunk railway station, Union Station and Conference Centre. During the early 1980's I was a Conference Centre employee.
Langevin - is part of a massive PWGSC redevelopment plan.The former Langevin block includes
59, 85, 75, 63, 65, 67, and 69 Sparks.
   The government of Canada wants to see modern architecture on the Parliamentary Precinct after the vacant buildings along Wellington, the Mall and Elgin Street are clear-cut. They should care about preserving our history and not about the needs of real estate developers.
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The politician for Somerset Ward is hoping to see more condos on the Mall. And intensification in Ottawa will be focused around LRT stations. The Parliament LRT station is located between O'Connor and Queen.
The Sparks Street Mall is Canada's counterpart to the National Mall in Washington, D.C.
Canada's Mall is part of the Parliamentary Precinct and is across the street from Confederation Square. It is protected by Section V of the Ontario Heritage Act as a Heritage Conservation District and by City of Ottawa By-Law #174-2000.
The National Mall in Washington D.C. 
The National Mall is sacred ground and no one would dare put up residential or office towers. Memorials, cultural institutions, art galleries and statues are located on America's Mall:
World War 11 Memorial
Vietnam Veterans Memorial
Washington Memorial
Lincoln Memorial
The Smithsonian.
Union Station is 1 mile away.

Ottawa's Union Station where I was employed. 

 House of Commons debates  July 20, 1973   
Hon. Jean Eudes Dube, Minister of Public Works.
"...concern has been expressed about the danger of visual encroachment on the beauty of the present parliamentary precinct, which is one of the great symbols of Canada. We must ensure that nearby developments do not affect it...We are all proud of the outstanding appearance and setting of the Parliament of Canada. It is as impressive as any in the world. I think we will agree that we have a duty to preserve its dignity, grace and beauty for the years ahead."

I have a few ideas.
Establish a Terry Fox National Museum in the vacant building on 90 Wellington. A statue of the one-legged runner is located on the plaza in front of 90 Wellington. My sister wrote and performed "A Song for Terry Fox" which is on YouTube.
Another museum could celebrate this country's contribution to the film and tv industry. Photographs, awards, etc. pertaining to Alex Trebek, Lorne Greene, James Cameron (Titanic), John Candy, Catherine O'Hara, Eugene Levy, Mary Pickford and a host of others can be displayed.
Create a tourist information centre on Wellington across from Parliament Hill. I visited Quebec City  and the tourism centre is across the street from the Chateau Frontenac Hotel. The tour bus operator pointed out all the places where Celine Dion sang including the Plains of Abraham and churches.
Create a restaurant on the Mall that serves Canadian food---poutine, split pea soup, Beavertails, Butter tarts, Nanaimo bars, Saskatoon rhubarb pie, Montreal-style bagels, etc. Provide a brochure that gives recipes.

Toronto's CBC Museum permanently closed a few years ago. The CBC is a national institution and the museum should be located in the National Capital. The CBC Headquarters on the Sparks Street Mall would be an appropriate venue. I would like to see Glenn Gould's piano. Glenn Gould donated all of his papers, photographs and memorabilia to the National Archives and the collection would gain a wider audience if it was displayed in the Parliamentary Precinct. More security guards would have to be hired because Glenn Gould artifacts are popular---an American woman stole documents from the Archives and tried to sell them on EBay. They were returned.
Convert one of the buildings into a movie theatre that features home-grown movies and unreleased documentaries:
Canadian Bacon with John Candy and Rhea Perlman.
Goin' Down the Road.
Beautiful Dreamers - the story of Canadian psychiatrist and mystic Dr. Maurice Bucke. Dr. Bucke was a friend of American poet Walt Whitman and wrote "Cosmic Consciousness- A Study in the Evolution of the Human Mind."
Thirty Two Short Films About Glenn Gould.
The Canadian Conspiracy with Martin Short, Howie Mandel, Leslie Nielsen, Anne Murray...

Humanitarian Lotta Hitschmanova created the Unitarian Service Committee, an agency that helped war-torn Europe after World War 11. I often heard Lotta Hitschmanova on CBC radio and television commercials asking for donations for the USC "an agency with a heart, 56 Sparks Street, Ottawa."
One of the vacant buildings could house a Canadian version of Madame Tussaud's Wax Museum.