LOS ANGELES (-- Crews in Los Angeles are set to pour concrete to lay the foundation for the tallest building to be built west of the Mississippi -- and they're hoping it's one for the history books.
The marathon concrete pour begins Saturday evening and is expected to last 20 hours without interruption. The continuous pour will be verified by an official from Guinness World Records.
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The Los Angeles Times reports that about 2,000 truckloads of concrete will be driven to the construction site in downtown LA where a skyscraper called the New Wilshire Grand will be built.
Once finished, the building will rise 1,100 feet, and will feature an outdoor terrace and swimming pool on the 73rd floor.
The project is estimated to cost more than $1 billion.