Buffer Zones.

One of the definitions of the term buffer zone is "An area of land designated for environmental protection." The following federal properties are now protected by buffer zones:

The National Parks. (House of Commons June 3, 2016. December 17, 1991. June 10, 2013. November 24, 2016.)

The Rideau Canal, from the Nation's Capital to Kingston, Ontario. (The Chateau Laurier Hotel extension and construction of a medical centre on the Farm may force the United Nations to remove UNESCO designation.)

Canadian National Marine Conservation Areas. (House of Commons,November 6, 2001.)

White Lake Dominion Radio Astrophysical Observatory - Penticton, British Columbia. 

Victoria, British Columbia Dominion Observatory - privatized. The surrounding land is now the site of a high end residential neighbourhood.

Gatineau Park and the Greenbelt. (House of Commons,September 16, 2009.)

Dominion Astrophysical Observatory, Carling Avenue Ottawa. "Counc. Riley Brockington, who represents the newly leased land, has been trying to lock into the lease conditions that would preserve as many of the existing buildings on the property as possible...such as the Dominion Observatory." (Reevely: Feds say they'll pay $11.8 M to clean up new Civic site. Ottawa Citizen, February 24, 2018.)

All of the government of Canada properties on Wellington Street facing Parliament Hill and properties near National Historic Sites of Canada in the National Capital Region. Pending. Read Senate Bill S-203 (November 2019) "An Act to Amend the National Capital Act." The buffer zone is 500 metres.

The Dominion Observatory in Ottawa. A local politician will "try" to save the landmark. Wikipedia photo.