Mission · Building 1 of 52 by AI share
AI tenants hold 100% of 3180 18th Street by observed square feet
Exa holds 40,000 square feet on record. DataSF lists the building at 37,104. It is one of 15 San Francisco buildings that are at least half AI. The AI figure is larger than the building record because the two come from different sources; the share is shown as 100%.
- AI share of building SF
- 100%
- AI square feet observed
- 40,000
- Building square feet (DataSF)
- 37,104
- AI tenants, October 2026
- 1
Tenants
AI tenants at 3180 18th Street, October 2026
| Company | Tier | Recorded from | Observed SF | Type | Sources |
|---|---|---|---|---|---|
| Exa | AI-native applications | August 2026 | 40,000 | Lease signed | Link |
Source: DataSF business registrations and DBI permits, SEC filings, press. Observed square feet only. Building square feet from the DataSF property record. "Recorded from" is the date of the registration or the press report of a signing, not a move-in date. See the building on the map.
| Company | Recorded from | Ended |
|---|---|---|
| OpenAI | September 2016 | December 2024 |
| xAI | January 2025 | August 2026 |
Deals
Leases and subleases reported here
- xAI took 37,000 square feet that OpenAI held (sublease, October 2024). Source
Nearby
Other measured buildings in Mission
- 575 Florida Street: OpenAI, 100% AI
- 208 Utah Street: Abridge, 90% AI
- 2300 Harrison Street: Thinking Machines, 88% AI
Part of San Francisco AI tenants, a register of 223 AI companies at 271 locations built from public records. See all majority-AI buildings and the methodology.
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