Anthropic’s Expansion Signals AI’s Growing Grip on San Francisco Office Demand

Anthropic’s expansion along Howard Street is quickly becoming a strong signal of how artificial intelligence is reshaping San Francisco’s office market.

The company first moved into 500 Howard St. in 2023, taking over space previously occupied by Slack. Since then, it has steadily expanded across nearby buildings. Recent deals at 400 and 405 Howard, along with a full-building lease at 300 Howard for its future headquarters, show how quickly its footprint has grown in a concentrated area.

Instead of consolidating into one location, Anthropic is holding onto its current space while adding more nearby. The company is converting its sublease at 500 Howard into a long-term direct lease and layering in additional offices to support near-term hiring. The approach suggests speed and flexibility are taking priority over long-term efficiency.

The scale of growth stands out. Anthropic now controls more than 900,000 square feet in San Francisco, putting it close to the footprint of OpenAI and in line with what companies like Google and Meta occupied during the last major tech cycle.

This activity is happening as the office market shows early signs of recovery. Vacancy is still high, but demand from AI companies is starting to absorb space, especially in well-located buildings. Leasing activity has picked up compared to the past few years, and AI tenants are playing a visible role in that shift.

There is also a noticeable change in how space is being leased. Companies are willing to take on multiple spaces at once, including short-term deals, to keep up with hiring. The focus is on securing room to grow immediately rather than waiting for a single long-term solution.

Funding is a key part of this story. AI firms are raising large amounts of capital, and some of that money is going directly into office space. In this environment, real estate becomes part of the growth strategy rather than something to minimize.

For the market, this points to a broader shift. AI companies are influencing how space is leased, where demand is concentrated, and how quickly decisions are made. If this trend continues, they are likely to become the main driver of office demand in San Francisco over the next few years.