ABC7News: Curiosity, concern over mysterious rocket being built in East Bay, September 26, 2018

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Excerpt:

The rocket belongs to a startup called Astra. They won't talk to us on camera. But their application to operate in Alameda says the company is building the next generation of rocket to launch satellites weighing 100 kilograms into orbit, compared to a much larger SpaceX rocket designed to lift 56,000 kilograms into space.

The Alameda Fire Department couldn't tell us if they store flammable rocket fuels on site, but by phone, fire captain Jim Colburn says Astra is complying with safety codes.

"This company has been a willing partner of the city and the fire department to operate in a very safe fashion. We're very pleased in how seriously they've taken their business and we honestly have no issues at this point with how they are conducting their business," he said.