Anthropic Subleases 30,000 Square Feet in San Francisco
The expansion reflects rapid headcount growth and adds to the company's existing 1 million square-foot SoMa footprint.
Updated on Oct. 27, 2026 in Remote Work
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Anthropic has subleased 30,000 square feet of office space from Meta Platforms at 181 Fremont Street in San Francisco. The expansion adds to the company's existing footprint in the South of Market district as its workforce and revenue grow rapidly.
Why it matters
The move highlights the intense demand for office space among high-growth tech firms in San Francisco, which is reabsorbing space previously shed by major social media companies. This expansion accompanies a significant increase in Anthropic's scale, with headcount jumping to 5,300 in September 2026 from 941 at the end of 2024.
Anthropic has expanded its footprint in the South of Market district to over 1 million square feet, fueled by revenue that surged to $16.3 billion in the first half of 2026 compared to $1.2 billion in the same period of 2025. The new 30,000-square-foot lease at 181 Fremont Street remains active until Meta's lease terminates in March 2031.
The players
Anthropic
An AI research and development company experiencing rapid growth in headcount and revenue.
Meta Platforms
A multinational technology conglomerate and social media operator that has been shedding office leases.
The details
The subleased space occupies the fifth and sixth floors of the 57-story 181 Fremont tower, a property Meta originally leased in its entirety in 2017 before listing much of it for sublease in 2023. This location sits adjacent to Anthropic's upcoming headquarters at 300 Howard Street, consolidating its operational density in the neighborhood. The deal marks another shift in San Francisco's commercial real estate, where fast-growing firms are absorbing office inventory previously vacated by larger, legacy tech entities.
Timeline
2017: Meta leased the office component of 181 Fremont Street.
2023: Meta listed its space at 181 Fremont Street for sublease.
H1 2025: Anthropic reported $1.2 billion in revenue.
H1 2026: Anthropic reported $16.3 billion in revenue.
March 2031: Meta's original lease at 181 Fremont Street expires.
Market Landscape
The sublease follows the 2023 listing of 181 Fremont Street for sublease, representing a significant reversal of Meta's long-term real estate strategy in San Francisco. This move signals a broader transition as AI-focused enterprises absorb high-end office inventory vacated by established social media firms.
Operators in the South of Market district should monitor the absorption rate of sublease inventory, as high-growth tech firms continue to tighten the market for premium office space. Small businesses sharing the area should prepare for potentially rising commercial activity and its subsequent impact on local service demand.
The takeaway
The rapid expansion of Anthropic underscores how quickly operational footprints can grow during a scaling phase, forcing companies to act aggressively on available real estate. Business owners should maintain flexibility in lease structures to accommodate similarly sudden changes in headcount or resource requirements.
Further reading
For more on how local office utilization is evolving, see the Remote Work section.
Source note: This article includes information reported by The Real Deal New York.
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