Nexen Building, Calgary

Geographic coordinate system List of tallest buildings in Calgary Downtown Calgary

Nexen Building
Nexen Building Calgary.jpg
Nexen Building south and east facade
General information
StatusVacant [1]
LocationCalgary, Alberta, Canada
Coordinates51°02′47″N 114°04′46″W / 51.04639°N 114.07944°W / 51.04639; -114.07944Coordinates: 51°02′47″N 114°04′46″W / 51.04639°N 114.07944°W / 51.04639; -114.07944
Cost121931465 $
Roof152 m (499 ft)[2]
Technical details
Floor count37
Floor area55,855 m2 (601,220 sq ft)[3]
Design and construction
ArchitectCPV Group Architects and Engineers
Main contractorCANA Construction Company

801 Seventh Avenue S.W., commonly known as the Nexen Building, is a high rise office building in downtown Calgary, Alberta, Canada.[4]

It is a 37-storey skyscraper, with a height of 153 m (502 ft).[2] 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 employs a composite stub-girder steel-frame floor system,[5] originally developed in part by Joseph Colaco.[6]

It is unique in that it is one of the few buildings in Calgary that do not follow the traditional grid pattern of the downtown core. Instead of facing south–north, or east–west, it stands diagonally.


The original tenant of the Nexen Building was the NOVA Corporation. In 2000, the building became Nexen's headquarters. In 2013, Nexen was purchased by Chinese state-owned CNOOC and reduced its workforce over time.

Nexen moved from the Nexen Building in 2019, instead subleasing 8 floors of The Bow from Cenovus, leaving the Nexen Building the largest-ever completely vacant building in downtown Calgary.[7][1]

See also


  1. ^ a b Toneguzzi, Mario (February 24, 2020). "Calgary's 600,000-sq.-ft. Nexen Building sits vacant". Calgary: Real Estate News Exchange (RENX). Archived from the original on March 5, 2020. Retrieved May 4, 2020.
  2. ^ a b Emporis. Nexen Building
  3. ^ "Nexen Building". Skyscraper Center. CTBUH. Retrieved September 27, 2017.
  4. ^ "Four downtown Calgary office buildings, including old Nexen tower, sit empty". CBC News. February 25, 2020. Retrieved April 8, 2020.
  5. ^ Stringer, David C. "Staggered Truss and Stub Girder Framing Systems in Western Canada Archived 2011-07-06 at the Wayback Machine". Technical paper published by the Canadian Steel Construction Council. 1982. Retrieved on January 20, 2009.
  6. ^ Colaco, Joseph P. "A Stub-Girder System for High-Rise Buildings[permanent dead link]". Technical paper presented at the AISC National Engineering Conference, New York. May 1972. Retrieved on January 20, 2009.
  7. ^ Hudes, Sammy (October 1, 2018). "Nexen moving into Bow Tower, subleasing eight floors from Cenovus". The Calgary Herald. Archived from the original on November 26, 2019. Retrieved January 26, 2020.