Ninety artificial intelligence companies are currently hunting for office space across San Francisco, together seeking a combined 5.3 million square feet, as the city reclaims its title as the country's hottest office market. Twenty-three of those prospective tenants are each looking for at least 50,000 square feet, a sign that AI's office footprint here keeps expanding even as the broader national market cools.
The figures come from real estate data firm VTS, as reported by The Real Deal, which tracks companies as they begin searching for office space rather than when leases are actually signed. Those searches typically precede signed leases by six to nine months, meaning the current wave of AI tenant activity may not translate into finalized deals until well into next year. VTS ranked San Francisco as the top market for office demand in the third quarter of 2026, with artificial intelligence companies driving much of that demand.
Bay Area Captures Nearly Half the Country's AI Office Hunt
San Francisco, Silicon Valley and the East Bay together accounted for 49% of national AI office demand by square footage, according to VTS data reported by the San Francisco Business Times. San Francisco alone represented 29% of that national total, while New York accounted for 18%. Silicon Valley added another layer to the regional dominance, with 60 AI companies there seeking a combined 3.4 million square feet, including 22 tenants each looking for at least 50,000 square feet.
The East Bay's AI footprint is more modest by comparison. Eleven companies are seeking office space there, with combined requirements totaling 186,000 square feet, and fewer than three of those East Bay tenants are looking for 50,000 square feet or more. The contrast underscores how concentrated the region's AI office boom remains within San Francisco and Silicon Valley proper.
Anthropic's Big Footprint Opens the Door for Smaller Startups
Part of the story in San Francisco is which companies came first. Anthropic secured a substantial footprint in the city, and that early move appears to have paved the way for smaller AI startups to enter the market and stake their own claims on office space. The number of AI companies searching for space in San Francisco climbed 51% year over year even as the combined square footage those companies are seeking fell 15% over the same period, a pattern consistent with a market shifting toward a larger number of smaller requirements rather than a handful of massive ones.
That shift shows up nationally too. AI office demand was moving toward more numerous, smaller requirements in the third quarter, according to data covered by Connect CRE. VTS chief executive Nick Romito said AI remained the most important source of new office demand but was entering a more mature phase, with a growing number of AI companies coming to market with more measured space needs rather than chasing sprawling campuses outright.
Quarterly Swings Still Point to a Longer Climb
San Francisco's AI office requirements actually fell 33.6% compared with the third quarter of 2025 and dropped another 8.4% from the second quarter of 2026. Yet despite those quarterly pullbacks, San Francisco's AI office demand is up 21% since the end of 2025, giving the city the largest increase in AI office demand among all markets VTS tracks over that stretch. The city's 81 active AI requirements now average 62,000 square feet each, and San Francisco alone sits at 5.0 million square feet of active AI demand, nearly a third of the national total, according to a separate VTS report.
National AI office demand overall was up 85% year over year, while demand within major AI hubs specifically surged 179%, VTS found. The number of new AI office requirements nationwide rose 27% over the trailing twelve months, climbing from 644 to 820. San Francisco, Silicon Valley and New York together represented 41% of all active AI requirements and 63% of active AI square footage nationally, per VTS; a separate VTS accounting put San Francisco, New York and Silicon Valley at 64% of 16.9 million square feet of active AI demand, with New York's 2.79 million square feet narrowly edging out Silicon Valley's 2.78 million square feet.
Broader Office Market Cools Even as San Francisco Climbs
San Francisco's rise comes against a backdrop of a softening national office market. National office demand cooled in the third quarter of 2026, even as that quarter still registered the second-highest third-quarter reading since the pandemic, according to VTS data. The national VODI finished the quarter at 67, down 11% from the second quarter and 7% year over year, though the index remained 3 points above where it stood at the end of 2025, per Connect CRE.
San Francisco's office demand reclaimed the top spot in VTS's Office Demand Index for the third quarter with a score of 87, Connect CRE reported. Local leasing activity reflects the broader momentum: San Francisco office leasing totaled just over 3 million square feet in the third quarter and more than 10 million square feet year to date, with positive net absorption of 1,068,105 square feet for the quarter, according to Kidder Mathews. The brokerage attributed that demand to growth in the AI and broader technology sectors, a trend that, for now, shows no sign of slowing even as individual quarters swing up and down.
