The Nexen Building is a high rise office building in downtown Calgary

Calgary

Calgary is a city in the Province of Alberta, Canada. It is located in the south of the province, in an area of foothills and prairie, approximately east of the front ranges of the Canadian Rockies...

, Alberta

Alberta

Alberta is a province of Canada. It had an estimated population of 3.7 million in 2010 making it the most populous of Canada's three prairie provinces...

, Canada

Canada

Canada is a North American country consisting of ten provinces and three territories. Located in the northern part of the continent, it extends from the Atlantic Ocean in the east to the Pacific Ocean in the west, and northward into the Arctic Ocean...

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It is a 37-storey skyscraper

Skyscraper

A skyscraper is a tall, continuously habitable building of many stories, often designed for office and commercial use. There is no official definition or height above which a building may be classified as a skyscraper...

, with a height of 152 m (499 ft). The commissioner and main tenant of the building is the Canadian energy company Nexen

Nexen

Nexen Inc. is an energy company based in Calgary, Alberta, Canada.-History:Nexen started in 1969 under the name "Canadian Occidental Petroleum Ltd.", aka CanOxy, and was 80% owned by Occidental Petroleum, a Los Angeles-based oil company...

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It was designed by CPV Group Architects and Engineers Ltd and built by CANA Construction Company Limited. The late modernist building was completed in 1982.

The Nexen Building (formerly the Nova Corporation headquarters building) employs a composite stub-girder steel frame floor system, originally developed in part by Joseph Colaco.