Public Works wanted to preserve historic buildings on Wellington Street, Ottawa during the year 2010.

Long-Term Vision and Plan for the Parliamentary Precinct.
     "PWGSC is the custodian of the buildings and grounds within the area surrounding Parliament Hill, known as the Parliamentary Precinct. Part of this important mandate is to maintain the historical and architectural integrity of these assets."
Google: Archived Treasury Board Wellington Street---ARCHIVED Treasury Board of Canada.
Now the department is planning to demolish many of the landmarks because "they are past their life cycle."

Bill S-210 An Act to Amend the National Capital Act

Comments on SkyScraper Page about the redevelopment of Block B, with Metcalfe Street to the east, O'Connor Street to the west, Wellington Street to the north and Sparks Street to the south.
"I can't even begin to imagine what could come out of a design competition that includes 2 historic bank buildings, a former embassy and ... 70's office tower. My biggest fear is that most of these buildings might be demolished with only the facade saved."
"I hope to see the parking lot plaza (former Rideau Club site) developed into new 3-4 storey buildings and the 70's block demolished and replaced with a residential tower or hotel."
"I find it concerning that they seem to be discussing razing this entire block. An old bank was converted into archives space about a decade ago. The spectacular old CIBC building is on this block, recently closed."

Don't tear down any heritage buildings on Wellington Street -Opinion-The Hill Times, February 10, 2020.

Parliamentary and Judicial Precinct Area : Site Capacity and Long Term Development Plan, Page 89 of 148.
"The federally owned blocks 1, 2 and 3, facing the Parliament Buildings, are required to have "medium profile buildings" in order to protect the visual integrity of the Parliamentary Lawn composition. The height limit for the buildings facing Wellington Street is 108 metres above sea level. The height limit for the buildings facing Sparks Street is 113 metres a.s.l".
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Conversion of metres to storys, online calculator:
108 metres - 32 storys.
113 metres - 34 storys.

Evidence - OGGO (39-2) No. 13-February 14, 2008.
(0935)
"The buildings potentially on the auction block include such special purpose structures as the National Film Board building in Montreal, the Library and Archives Building in Ottawa and the Film Preservation Centre in Gatineau."
Mr. James Moore: "The Liberals had an RFP to sell more than 360 federal government buildings. We've sold seven."
Mrs. Natalie Bull (Executive Director, Heritage Canada Foundation): You might ask why the Heritage Canada Foundation is interested in this topic and why we've been invited. The federal government is a major property holder and counts more than 1,300 designated buildings in its inventory...The 35 buildings in the real estate study included many heritage buildings such as the Dominion Building in Toronto, the National Printing Bureau in Gatineau, the East Memorial in Ottawa and the Wellington Building that we're sitting in today...Our concerns fall in two areas. One is the important role of the federal government as a trustee of legacy buildings. Our second concern is the risk that heritage buildings faces when they leave the federal inventory.
Federal buildings are about accommodating civil servants, but they do a lot more than that. Traditionally they were designed to make a big impression and do reflect our ideals as a nation. They were built to last as public landmarks and monuments and they really reflect the federal presence in towns and cities across the country. They were also designed to demonstrate high standards of design and construction, and they often showcased some of our best architects. In short, we would say that they represent a legacy that belongs to all taxpayers.
Mr. Mario Silva (Davenport, Lib.): ...I think you're absolutely right that the collection we have of buildings and heritage assets across the country is quite fundamental to our country's essence of what we are as a people and as a nation. It's really the soul of what Canada is all about. If we destroy that we really destroy our history.
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128 Wellington and 140 Wellington are facing demolition or facadism:

The Union Bank Building and Senate of Canada would be protected by Bill S-208, an Act to Amend the National Capital Act:
Section 2 of the National Capital Act amendment, building or work of national significance pertains to:
d.) the Victoria Building located at 140 Wellington Street in the City of Ottawa;
j.) any place that has been commemorated as a historic place under paragraph 3 (a) of the Historic Sites and Monuments Act;
l.) any prescribed building or work.
Also, there would be a 500 m or 1,640 foot buffer zone pertaining to the demolition, alteration or construction of new buildings on a parcel of land near a work of national significance.
The Parliament Hill Complex is a National Historic Site of Canada.

The First Reading of Bill S-208 was December 10, 2019.
The Second Reading was December 12, 2019.