Shell Centre was a 33-storey, 140 m office tower in Calgary, Alberta, Canada. At completion in 1977, Shell Centre was the fourth tallest building in Calgary, behind TD Square Dome Tower, Bow Valley Square Two, and Stephen Avenue Place. The building was renamed 400 4th Avenue in 2024, when Shell Canada moved their offices to the Bow building in Calgary, AB. Shell removed their logo in October 2023 before moving offices.
Shell Centre was announced by Olympia and York Developments in February 1975 as a $35-million, 33-storey, 630000 sqft[2] tower to be built on the site of the former Caravan Hotel. The building would be Olympia and York's first development in Western Canada, which went ahead despite the absence of a major tenant at announcement.[3] During construction of the building Shell Oil would step forward to become the primary tenant for the building in a plan that would consolidate the oil company's 1,000 employees in Calgary, and changing the name of the building to Shell Centre.[4] Shell Centre's design called for 34,000 cubic yards of concrete and 4,700 tons of steel in construction, and the structure was cladded with 1.25 inch think slabs of Italian