LOS ANGELES (CBSLA.com) — The Los Angeles City Council was set to vote Tuesday on a $100 million expansion effort at an elite Brentwood girls school despite opposition from residents.

About a dozen homeowner groups have come out against the proposal from the Archer School for Girls located at 11725 Sunset Blvd., long considered by many to be one of the city’s most consistent traffic congestion hotspots.

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Hundreds of petition signers have urged Councilman Mike Bonin, who represents Brentwood, to delay any City Council action until an environmental impact report is conducted on the Archer project.

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Some residents believe the plan will only worsen already-congested traffic along a 1.2-mile corridor of Sunset between the 405 Freeway and Bundy Drive.

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Archer officials say they have already cut the size and duration of the project by 50 percent and that they will make every effort to limit the impact from construction.