What is the common denominator for all of these properties?

At one time they were owned by the People of Canada.
1.)  CFB Rockcliffe - Department of National Defence.
2.)  Booth Street Complex - Natural Resources Canada
3.)  811 Gladstone Avenue - Canada Mortgage and Housing Corporation-now an Ottawa Community Housing asset, and they are building Rochester Heights.
4.)  933 Gladstone Avenue - Department of National Defence - an Ottawa Community Housing asset, they are building the massive Gladstone Village--- the National Capital's Regent Park.
5.) 91 acres of Central Experimental Farm land at Baseline and Merivale - Agriculture Canada
6.)  Wallis House - Rideau Street - Department of National Defence
7.)  800 Montreal Road - Forestry Canada
8.)  Lees Avenue Armoury - Department of National Defence
9.)  363 Smyth Road - Veteran's Affairs
10.) Chateau Laurier Hotel
11.) The former Teachers College/Normal School - Elgin Street - now part of Ottawa City Hall.
12.) The Rideau Centre Shopping Mall - PWGSC
13.) The Daly Building - National Capital Commission - Several people wanted to see the vacant land preserved and designated "The John Lennon International Peace Park". John Lennon and Yoko Ono briefly stayed at the nearby Chateau Laurier Hotel during their 1969 Bed Ins for Peace campaign, and they visited Prime Minister Pierre Trudeau in the Parliament Buildings. They also talked to Federal Health Minister John Munro about legalizing marijuana.
14.) Mackenzie King Bridge and Laurier Avenue Bridge - National Capital Commission
15.) Lansdowne Park - Department of National Defence

The Brooke Claxton Building, Tunney's Pasture during the early 1970's. This is a family photo.

Hank LeClair, John Lennon, Yoko Ono and Federal Health Minister John Munro in the Brooke Claxton Building, Tunney's Pasture Ottawa.