Record concrete pour underway in Los Angeles

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(CNN) - The tallest building west of the Mississippi is under construction in Los Angeles is setting a world record this weekend, as concrete trucks are lining up for the longest continuous pour ever, expected to last 20 hours.  An official from the Guinness Book of World Records will verify the results.

Two-thousand truckloads of concrete will be poured for the New Wilshire Grand, a hotel and office building.

The building will top out at over 1000 feet tall.

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