One of Conco’s latest projects is providing concrete services on the new Wilshire Grand Center that will reshape the Los Angeles skyline as the tallest building west of the Mississippi. This got our attention and we started a series of blogs about some of the tallest buildings in the world. Concluding the series, we have reached the tenth skyscraper, and this one is located in the U.S.
The Willis Tower, formerly and maybe better known as the Sears Tower (renamed in July, 2009), is in downtown Chicago. The 110-story, 1,451 ft. (pinnacle height of 1729 ft.) was completed in 1973, and held the title of the tallest building in the world until 1998. It held on to the title of the tallest skyscraper in the U.S. until the recently constructed One World Trade Center passed it by.
The skyscraper was built as the headquarters for the Sears Roebuck and Company and designed by the architectural firm, Skidmore, Owings and Merrill. The structural engineer was Fazlur Khan. The building uses a steel-framed bundled-tube construction method that consists of nine square tubes that support the building. It has 4.5 million gross sq. ft. of floor space. According to the Willis Tower’s website, when the last beam was put into place, it was signed by 12,000 people that included construction workers, Sears’ employees, and Chicagoans.
When Willis Group Holdings bought the building in 2009, they did a multi-million dollar renovation on Skydeck Chicago, the 103rd floor observation deck. The newly remodeled Skydeck now includes The Ledge that offers unobstructed views of Chicago and a glass floor for a view 1,353 ft. straight down. It also has a café and a large retail store.
Conco is a leading supplier of concrete services for the Western United States and is once again involved in doing concrete work for a major landmark project. The new Wilshire Grand Center will reshape the Los Angeles skyline as the tallest building west of the Mississippi. As a part of the project, Conco successfully poured the largest continuous mat foundation ever done in the U.S. on February 15, 2014.