HALF MOON BAY, Calif. (AP) — California’s coastal regulator is threatening to fine a billionaire investor millions of dollars for ignoring a court order to open a popular beach to the public.

A San Francisco appeals court ruled in August that venture capitalist Vinod Khosla broke state law when he blocked the public from Martins Beach, south of Half Moon Bay. He bought a $32.5 million beachfront property there in 2008 about 30 miles (48 kilometers) south of San Francisco.

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Vinod Khosla of Khosla Ventures speaks onstage during TechCrunch Disrupt SF 2015 at Pier 70 on September 23, 2015 in San Francisco, California. (Photo by Steve Jennings/Getty Images for TechCrunch)

On Tuesday, the California Coastal Commission released a cease-and-desist letter ordering Khosla to remove a locked gate and signs warning of no trespassing and beach closed. It also seeks to ban further development without a permit.

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An attorney for Khosla, Dori Yob Kilmer, declined to respond to the letter.

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