The Fairmont Chateau Lake Louise addition is exactly the same as the original hotel.

The Fairmont Chateau Lake Louise Hotel is located in the Banff National Park UNESCO World Heritage Site. The Glacier Wing (second from the right) was constructed from 1988-1992.

" Chateau Lake Louise initiated a series of major capital expansions to the existing hotel in preparation for the 1988 Winter Olympics. These additions and renovations included a new entry pavilion, parkade, renovations and the new Glacier Wing. The architectural design for the Chateau's new entrance pavilion and Glacier Wing built upon the historic image of the Canadian Pacific's grand train station entrances. The entire building is clad in Canadian Tyndal stone." (From: MTa-Chateau Lake Louise addition.)
Tyndall limestone is from Manitoba.
The following railway hotels were clad with Indiana limestone:
1.)  Chateau Laurier - Ottawa, Ontario.
2.)  Fairmont Hotel Macdonald - Edmonton, Alberta.
3.)  Fort Garry Hotel - Winnipeg, Manitoba.
4.)  Fairmont Royal York Hotel - Toronto, Ontario.

Buildings that are constructed with limestone can last for thousands of years; as I have said before, the Great Pyramid of Giza in Egypt is 4,000 years old.

Lord Elgin Hotel - Prime Minister Mackenzie King chose the stone from a quarry in the Niagara Region.
Kingston, Ontario is known as "The Limestone City" because many notable buildings were created with local limestone.
Old Kingston Post Office
The CNR Outer Station on Montreal Street.
Kingston Penitentiary
Prison for Women
Church of the Good Thief
Isabel MacNeill Halfway House for Women
Penitentiary Museum on King Street
Collins Bay Institution
Stone Gables
Royal Military College of Canada.
Queen's University - local and Niagara Region limestone.
Fort Henry National Historic Site of Canada.
Penitentiary Water Tower
Rockwood Asylum
The Armoury on Montreal Street
Kingston General Hospital
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The Canadian pavilion at the Epcot Center, Disney World in Orlando, Florida is modeled after Ottawa's Chateau Laurier Hotel. The "Hotel du Canada" was built in 1982. 

My Dad (left) and Canadian Prime Minister Pierre Trudeau beside Union Station, Ottawa, which is directly across the street from the Chateau Laurier. (1968 photo.) The Grand Trunk Railway station was created with Indiana limestone.

Union Station became the Conference Centre.