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Anthropic in talks to take over entire San Francisco office tower

Fast-moving AI giant negotiates deal to expand corporate headquarters
The vacant office tower at 300 Howard St. in San Francisco has previously played home to companies such as StubHub and Fitbit. (CoStar)
The vacant office tower at 300 Howard St. in San Francisco has previously played home to companies such as StubHub and Fitbit. (CoStar)
CoStar News
November 21, 2025 | 10:27 P.M.

In a sign of the furious demand among artificial intelligence companies for San Francisco office space, tenants are not only looking to sign multi-floor deals — they're now shopping for entire buildings.

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News | Anthropic in talks to take over entire San Francisco office tower