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Originally known as the John Hancock Observatory (JHO) when it was first opened in 1969, the observatory has enthralled tens of thousand of visitors each year.

In this section, youll learn more about the history of our building, you also learn how the 360 CHICAGO observatory became the go-to destination for visitors who want to experience the best views of the city and its historic lakefront.

And best of all, youll also learn more about the making of TILT A true architectural achievement.

Construction of the tower was interrupted in 1967 due to a flaw that was discovered in an innovative engineering method used to pour concrete in stages.

The engineers were getting the same soil settlements after the first 20 stories had been built as they expected for the entire 99 stories.

This forced the owner to stop development until the engineering problem could be resolved, and resulted in a credit crunch.

The owner went bankrupt, which resulted in John Hancock taking over the project, which retained the original design, architect, engineer and main contractor.

Once the tallest building in the world outside of New York when it was completed in 1970, the John Hancock Center stands along with the Willis (Sears.

The one hundred story tall John Hancock Center, is recognized as an icon to local Chicago and skyscraper enthusiasts worldwide.

The Skidmore, Owings Merrill building stands 343.5 meters to the roof and is an additional 114 meters to the top of the tall antenna.

Its first resident was Ray Heckla, the original building engineer, responsible for the residential floors from 44 to 92.

Including its two antennas, the John Hancock Center has a height of 1,500 feet (457.2 m), making it the fourth highest building in Chicago and the thirty-third tallest building in the world when measured to pinnacle height.

The observation deck elevators in the John Hancock Center, were manufactured by Otis, and travel 96 floors at a top speed of 1,800 ftmin (20.5 mph).

The observatory is a member of the World Federation of Great Towers.

It has won various awards for its distinctive style, including the Distinguished Architects Twenty-five Year Award from the American Institute of Architects in May 1999.

Design construction highlights John Hancock Center is characterized by the distinctive X-shaped external bracing that made it an architectural icon.

This bracing also eliminated the need for inner support columns, greatly increasing amount of available floor space.

The buildings design allows only five to eight inches of sway in a 60 mph wind; its been tested to withstand winds of 132 miles-per-hour.

At the peak of construction, more than 2,000 people worked on the project; some five million man-hours were required to complete the development.

The buildings 1,250 miles of wiring carries enough power to supply a city of 30,000 people Theres enough aluminum in the building to cover 12 football fields.

Its 11,459 extra-thick, bronze windows contain enough glass to produce a single, 5 ft sheet 13 miles long.

Because of the John Hancock Centers lakeside location, caissons had to be sunk into 10 ft wide holes drilled 190 ft into bedrock.

The unusual design required innovative construction methods, including the use of creeper cranes, previously used only in bridge construction, to hoist steel beams into place.

History of 360 CHICAGO With its unique location and breathtaking 360 views, our 94th floor observatory has long been acknowledged as the best place to see Chicago at its best.