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Anthropic grows San Francisco headquarters alongside climbing valuation

Lease delivers latest signal of office market turnaround fueled by AI
Artificial intelligence company Anthropic initially moved into San Francisco's Foundry Square office complex as part of a sublease deal with Slack. (CoStar)
Artificial intelligence company Anthropic initially moved into San Francisco's Foundry Square office complex as part of a sublease deal with Slack. (CoStar)
CoStar News
September 23, 2025 | 10:56 P.M.

Artificial intelligence company Anthropic has cemented a deal to expand its San Francisco headquarters within weeks of closing a $13 billion funding round.

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