Calgary Tower

When Marathon Realty and Husky Oil built their new head offices in Calgary, they proposed building the tower both to honour Canada's centennial year of 1967 and to encourage urban renewal and growth of the downtown core.[3] The structure was designed by A. Dale and Associates, and was designed to withstand earthquakes and winds of up to 161 km/h (100 mph).[4] Construction began on February 19, 1967, and completed in 15 months at a cost of C$3.5 million.[5] The column of the tower was built from an unprecedented continual pour of concrete. Pouring began May 15, 1967 and was completed 24 days later at an average growth of 7.6 m (25 ft) per day, a rate that was praised by industry officials as an "amazing feat of technical and physical workmanship".[6]

Upon completion, the Husky Tower stood 190.8 m (626 ft) tall and was the tallest structure of its type in North America.[3] It dominated the Calgary skyline, standing well over twice the height of the previous tallest structure in the city, Elveden House.[6] Developers deliberately misled the public, claiming the tower would stand 187 m (614 ft), in the hopes of preventing competing developers from surpassing the Husky Tower's height record. Shortly after officials in San Antonio, Texas attempted to claim the record in announcing the completion of the 190 m (620 ft) Tower of the Americas, developers revealed the Husky Tower's true height.[7]

The Husky Tower officially opened on June 28–30, 1968, in three separate ceremonies.[5] The observation level featured a lounge/restaurant called the Hitching Post.[8]

The Calgary Tower in 1978, showing the original red and yellow paint scheme

Marathon Realty acquired a controlling interest in the tower in 1970.[9] The structure was formally renamed the Calgary Tower on November 1, 1971 as a tribute to the citizens of the city. It is still called the Husky Tower by airport officials, however, to distinguish it from the tower at the Calgary International Airport.[5]

The Petro-Canada Centre's west tower overtook the Calgary Tower as the tallest structure in Calgary in 1983.[9]

The tower underwent significant renovations between 1987 and 1990. The addition of a souvenir shop and a revolving restaurant were part of a $2.4 million refurbishment of the upper levels of the tower. [3] In 1990. a glass rotunda to serve as the new lobby was added. [5]

A natural gas-fired cauldron was constructed at the top of the tower by Canadian Western Natural Gas in October 1987 as a gift to celebrate the 1988 Winter Olympics.[9] The torch, which consumes 850 cubic metres (30,000 cu ft) per hour, was first lit on February 13, 1988 when the Games opened, and burned 24 hours a day throughout. It continues to be reignited for various special events, including Canada Day.[5]

The tower was a founding member of the World Federation of Great Towers in 1989 along with the Eiffel Tower, among others.[10] It celebrated its 25th anniversary in 1993, a year in which it topped 500,000 visitors for the first time.[3]

A glass floor extension was constructed on the north side of the tower's observation deck and opened on June 24, 2005. When standing on the glass, one can look straight down on 9th Avenue South and Centre Street.[11]

An LED, multicolour exterior lighting system was added and was first tested on August 1, 2014. 12 lights were added to the crown and 24 to the exterior floor. Each light has been programmed to be able to create over 16.5 million combinations of colour and lighting effects. It has been used since October 8, 2014, becoming a more noticeable part of the city skyline at night.[12]