The AI Office Boom Is Rewriting San Francisco's Real Estate Market — and Spreading Fast
OpenAI crossed 1 million square feet in SF alone. AI companies now occupy 10% of the city's office stock, and the expansion is moving to Mountain View, Bellevue, and London.
By Jimmy Lo
AI companies have gone from niche tenants to the defining force in U.S. office markets in under three years.
OpenAI alone now occupies more than 1 million square feet in San Francisco — all concentrated in Mission Bay — after signing a 280,000 sf sublease at the former Dropbox headquarters in March 2026. At the same time, it locked up a five-building, 450,000 sf campus in Mountain View and expanded its Bellevue footprint by another 223,000 sf. Anthropic signed a major London lease alongside OpenAI as both companies accelerated international expansion.
The aggregate picture is striking: 413 AI companies now occupy 8.5 million square feet in San Francisco alone — roughly 10% of the city's entire office stock. That footprint has grown 700% since 2022, turning a market that was widely written off during the remote-work era into one of the tightest office markets in the country.
The implications for commercial real estate are structural, not cyclical. Unlike the last tech boom, AI companies are signing long leases for large, amenity-heavy campuses — the kind of space that signals organizational commitment rather than hedging. For cities that can attract AI headquarters, the demand is durable. For cities that can't, the gap in office absorption is widening.
Source: The Real Deal · Bisnow · Bloomberg
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