An NCC document proves that the addition to the Chateau is a condominium project.

"The design and contractual sale condominium agreements for the addition must fully resolve noise generated by continuing events in Major's Hill Park, and avoid any possibility of complaints by residents of the new addition."
(From: "NCC Chateau Laurier Urban Design Guidance." Year 2008.)
The NCC included the following statement in the document:
"The addition should convey a residential character through the treatment of the podium and by implementing a truly contemporary architecture that also recognizes and is compatible with the heritage character of the hotel without falling into a historic or stylized architecture seeking to replicate the original building."
     What is wrong with trying to copy the original design of the hotel? When Sheila Copps was the Minister of Heritage the Fairmont Chateau Lake Louise created an addition that is identical to the original hotel.
It is worth noting that the NCC owned the Chateau during the mid-1960's, and the Crown corporation is the custodian of Major's Hill Park. I can envision:
1.) Larco buying Major's Hill Park land in order to expand their investment even more. If Larco owns the air rights over the hotel the City of Ottawa will never permit a vertical expansion. Federal parkland in Ottawa has been sold before:
--- The City of Ottawa wanted to buy the 88-acre Moffat Farm in the year 2002 for $400,000 dollars, but the offer was rejected.The land was sold to a developer who created a subdivision called "Prince of Wales on the Rideau".
---Many people wanted the Daly Building vacant lot to be transformed into a park. But Chairman Beaudry said that neighbouring businesses, even the Chateau Laurier owner, were against that idea because of "vagrants."
---A vacant property next to the Connaught Building was destined to be part of Major's Hill Park but the green space was sold to the American government for their embassy. (From: Dreams of Major's Hill Park, 1969-1970 - Urbsite.)
---PWGSC is giving Queen Juliana Park at 870 Carling Avenue to the Civic Hospital.

2.) Canada Day celebrations and other events on Major's Hill being banned if the condo residents complain.
3.) Larco cutting down the trees that block Chateau Laurier views of Major's Hill Park.

13, 249 people signed the petition "Block changes to the Chateau Laurier's Classic Look/Protegez le Chateau Laurier" as of  today, August 26, 2019.
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Nineteen years ago a proposed extension to the hotel replicated the architectural character of  1 Rideau Street, Ottawa:
Heritage Alteration - Chateau Laurier, 1 Rideau Street - Executive Report (Page 99 of 111 pages.)
     "This addition will add approximately 159 new rooms and approximately 72 parking spaces...The form of the addition has respected the massing, height, articulation and materials of the existing building while retaining its own character. Limestone will continue to be used as the principal material to face the building...The proposed addition to the Chateau is recommended for approval because it is respectful of the architectural character of the original building while creating a design of interest in its own right." (From: Planning and Economic Development Committee, City of Ottawa--July 27, 2000.)

Heritage Alteration - 1 Rideau Street Ottawa. The trees were retained.The drawing is from a July 27, 2000 report.