The Bow (skyscraper)
|Location||500 Centre Street SE, Calgary, Alberta, Canada|
|Construction started||June 13, 2007|
|Cost||$1.4 billion CAD|
|Roof||236 m (774 ft)|
53 office floors
2 retail floors
4 mechanical floors
3 sky gardens
|Floor area||2,150,425 sq ft (199,781.0 m2)|
|Design and construction|
|Architect||Foster + Partners, Zeidler Partnership Architects|
|Structural engineer||Halcrow Yolles|
|Main contractor||Ledcor Group of Companies|
The Bow is a 158,000-square-metre (1,700,000 sq ft) office building for the headquarters of Encana Corporation and Cenovus Energy, in downtown Calgary, Alberta. The 236 metre (774 ft) building is currently the second tallest office tower in Calgary, since construction of Brookfield Place; and the third tallest in Canada outside Toronto. The Bow is also considered the start of redevelopment in Calgary's Downtown East Village. It was completed in 2012 and was ranked among the top 10 architectural projects in the world of that year according to Azure Magazine.
Early project plans
Encana Corporation, North America's second largest natural gas producer, announced plans for the high-rise in 2006. Early designs suggested that the project would consist of a complex of towers (perhaps two or more) over two blocks. The tallest of these towers could be 60 stories tall, which would make it taller than the current tallest tower in Western Canada, the Suncor Energy Centre (also in Calgary). Conflicting reports suggested that it would be one single tower around 70 stories tall and possibly over convert 1000 ft, making it the tallest building in Canada. Other sources suggested a two tower complex spanning the entire surface of two blocks, with a second tower of 40 to 50 stories connected at sixth stories level over 6th Avenue. Official statements declared that the tower will be 58 stories, or 247 metres (810 ft) tall.
The management company in charge of the project was Texas-based Matthews Southwest, with architectural services furnished by UK-based Foster + Partners & Zeidler Partnership Architects of Calgary.
Announcement of the Bow
The project filed for development permit application is called The Bow, for its crescent shape and the view of the Bow River. On October 12, 2006, Foster + Partners revealed the first designs for the new tower.
Plans called for the project to house two separate companies, both equally occupying the space: Encana Natural Gas, with over 3,000 Calgary-based employees; and Cenovus Energy's more than 3,600 Calgary-based staff. Both companies were located at multiple sites throughout the downtown core. With an estimated 158,000-square-metre total office space, the complex was expected to be the city's largest. Construction started in June 2007, and the building opened in June 2013 with a final cost of $1.4 billion. The tower was lowered down to 236 m due to shadowing concerns and is the 149th tallest building in the world.
On February 9, 2007, EnCana sold The Bow office project assets to H&R Real Estate Investment Trust for $70 million, while signing a 25-year tenant lease agreement that was to start after the project's completion.
Groundbreaking took place on June 13, 2007, with work starting on both sides of 6th Avenue South between Centre Street and 1st Street East. Sixth Avenue was excavated, after closure of the block (August 21, 2007) and the six level underground parkade was constructed on a two block area, on both north and south side of 6th Avenue.
A neighbouring historic building – The York Hotel, built 1929–1930 in the Edwardian Commercial Architectural style – was demolished to make room for the new building. Because of the historical significance of the York Hotel, it was important to save as much as reasonable to incorporate into the new structure. Between 70 and 80 percent of the bricks were saved and used to reconstruct two of the hotel’s exterior walls. The brown brick originally supplied by Clayburn Brick in Abbotsford and the cast-in-concrete friezes have been removed, numbered and graphed to show the original location the brick and friezes were installed on the new building in their original locations. The remainder of the building was demolished ahead of schedule by Calgary-based demolition and environmental contractor Hazco.
The concrete foundation was continuously poured over 36 hours on May 11 and 12, 2008, being the largest of its kind in Canada, and third largest in the world after the Howard Hughes Center in Los Angeles and the Sama Tower (Al Durrah Tower) in Dubai. Some 14,000 cubic metres (18,000 cu yd) of concrete filled the 3,000-square-metre (30,000 sq ft) foundation.
Erection of the above-ground steel superstructure began in October 2008 with the installation of the first of two Favelle Favco heavy-lift tower cranes.
Construction was briefly halted in December 2008 due to a $400 million shortage of financing needed to finish the job. The project continued to move forward, despite the unresolved financing issues. In April 2009, a secondary tower in the project, the 200,000-square-foot (19,000 m2) building planned for a block south of the main tower, was put on hold for at least two years. The main tower, however, was set to continue, having secured the remaining $475 million required for completion of the structure.
On July 8, 2010, the Bow surpassed Suncor Energy Centre as Calgary's highest building. The 215 metres (705 ft) tall Suncor Energy Centre was the highest building in Calgary since 1984. The addition of a steel girder, part of floors 55 to 57, raised the Bow tower to 218 metres (715 ft).
The construction involved building a caisson wall shoring system (July 2007)
Construction on the Bow seen from Crescent Heights in September 2009
Looking up from under 6th Avenue South, downtown Calgary in March 2012
The Bow now replaces Suncor Energy Centre as the tallest building in Calgary.
Encana officially confirmed on June 16, 2008, that Jaume Plensa, an artist most famous for the Crown Fountain in Chicago, had been chosen to complete two major public art installations for the project. The first work, entitled Wonderland, was unveiled on January 25, 2013, on the south plaza. The second work, entitled Alberta's Dream is located on the north side and depicts a bronze casting of the artist embracing a living tree.
- Height: 236 metres (774 ft)
- 58 stories
- Footprint: 190,000 square feet (18,000 m2)
- Parking: 1,400 parking stalls (6 level parkade, spanning two blocks on both sides of 6th Avenue)
- +15 skywalk connections to neighbouring buildings (Telus building, Suncor Energy Centre)
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