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World Record: Wilshire Grand developers complete largest concrete pour in history

Construction on the Wilshire Grand project in downtown Los Angeles broke a world record Sunday for the longest concrete pour, surpassing a record set by crews pouring the foundation for Las Vegas' Venetian hotel back in 1999.

Crews poured 21,200 cubic yards of concrete from 208 trucks. Work began shortly before 5 p.m. Saturday.

"We're usually scrambling and you see a lot of chaos – it's pretty much the norm in construction," said Scott Borland, vice president of construction for the Wilshire Grand. "That's not been the case here over the last 20 hours. The plan that we've executed here is actually playing out just the way we thought."

The pour laid the foundation for a planned 73 story luxury hotel, office and retail space in downtown LA. When completed in 2016 the structure will be the tallest west of the Mississippi.

Related: World Record: Wilshire Grand developers attempt largest continuous concrete pour in history

A representative from the Guinness Book of World Records was on hand Sunday to confirm the record.

When the record was announced, drivers in the cement trucks lining the construction site blasted their horns.

"A lot of times when I come to places it's for something really frivolous. Coming here, this is such a great thing for the community, for Los Angeles, the downtown area, that I'm really excited to be part of it," said Michael Empric, an adjudicator with Guinness World Records. "And setting the Guinness World Record is just a small part of it. This is more about revitalizing the community."

The record-breaking pour involved 300 workers and took about 20 hours.

"As the engineers described it to me, this has been a ballet of moving concrete trucks in and out to break this world record," Empric said.

After Empric announced the new record, he gave a plaque to Borland and other Turner Construction executives.