[
 {
  "prior": "Slack",
  "ai_tenant": "Anthropic",
  "address": "500 Howard Street",
  "sf": 230325,
  "date": "2023-09",
  "semantics": "sublease_in_rsf",
  "source": "https://news.theregistrysf.com/ai-firm-anthropic-to-lease-230000-sqft-at-former-slack-hq-in-san-francisco/"
 },
 {
  "prior": "Uber",
  "ai_tenant": "OpenAI",
  "address": "1455 3rd Street",
  "sf": 486600,
  "date": "2023-10",
  "semantics": "sublease_in_rsf",
  "source": "https://sfstandard.com/2023/10/27/openai-uber-headquarters-mission-bay/"
 },
 {
  "prior": "Okta",
  "ai_tenant": "Hive",
  "address": "100 1st Street",
  "sf": 57000,
  "date": "2023-12",
  "semantics": "sublease_in_rsf",
  "source": "https://propmodo.com/ai-companies-are-looking-to-lease-office-space-in-san-francisco/"
 },
 {
  "prior": "Old Navy",
  "ai_tenant": "OpenAI",
  "address": "550 Terry A Francois Boulevard",
  "sf": 315000,
  "date": "2024-09",
  "semantics": "lease_signed_rsf",
  "source": "https://hoodline.com/2024/09/openai-bolsters-san-francisco-footprint-with-major-315k-square-foot-mission-bay-lease/"
 },
 {
  "prior": "OpenAI",
  "ai_tenant": "xAI",
  "address": "3180 18th Street",
  "sf": 37000,
  "date": "2024-10",
  "semantics": "sublease_in_rsf",
  "source": "https://traded.co/deals/california/office/lease/3180-18th-street/"
 },
 {
  "prior": "Airbnb",
  "ai_tenant": "Scale AI",
  "address": "650 Townsend Street",
  "sf": 180000,
  "date": "2024-12",
  "semantics": "sublease_in_rsf",
  "source": "https://sfstandard.com/2026/04/07/i-leaderboard-san-francisco-office/"
 },
 {
  "prior": "Cloudflare",
  "ai_tenant": "Glean",
  "address": "634 2nd Street",
  "sf": 30000,
  "date": "2025-06",
  "semantics": "sublease_in_rsf",
  "source": "https://news.theregistrysf.com/ai-firm-glean-takes-30000-sqft-in-san-francisco-in-sublease-deal-from-cloudflare/"
 },
 {
  "prior": "Airbnb",
  "ai_tenant": "Physical Intelligence",
  "address": "808 Brannan Street",
  "sf": 60000,
  "date": "2026-03",
  "semantics": "sublease_in_rsf",
  "source": "https://hoodline.com/2026/01/ai-upstarts-gobble-up-block-size-offices-in-showplace-square/"
 },
 {
  "prior": "Meta Platforms",
  "ai_tenant": "Perplexity",
  "address": "181 Fremont Street",
  "sf": 80561,
  "date": "2026-03",
  "semantics": "sublease_in_rsf",
  "source": "https://traded.co/deals/california/office/lease/181-fremont-street-3/"
 },
 {
  "prior": "Dropbox",
  "ai_tenant": "OpenAI",
  "address": "1800 Owens Street",
  "sf": 280000,
  "date": "2026-03",
  "semantics": "sublease_in_rsf",
  "source": "https://therealdeal.com/san-francisco/2026/03/16/openai-inks-another-mission-bay-lease/"
 },
 {
  "prior": "Meta Platforms",
  "ai_tenant": "Mercor",
  "address": "181 Fremont Street",
  "sf": 27272,
  "date": "2026-06",
  "semantics": "sublease_in_rsf",
  "source": "https://news.theregistrysf.com/ai-training-startup-mercor-expands-with-27272-sqft-sublease-at-san-franciscos-181-fremont-tower/"
 },
 {
  "prior": "Sony Interactive Entertainment",
  "ai_tenant": "LangChain",
  "address": "303 2nd Street",
  "sf": 70000,
  "date": "2026-06",
  "semantics": "sublease_in_rsf",
  "source": "https://therealdeal.com/san-francisco/2026/06/17/ai-firm-leases-70000-more-square-feet-in-san-francisco/"
 },
 {
  "prior": "Cruise",
  "ai_tenant": "Cognition",
  "address": "333 Brannan Street",
  "sf": 180000,
  "date": "2026-08",
  "semantics": "sublease_in_rsf",
  "source": "https://news.theregistrysf.com/cognition-subleases-180000-sqft-at-333-brannan-from-cruise-expanding-san-francisco-footprint-sevenfold/"
 },
 {
  "prior": "Airbnb",
  "ai_tenant": "Physical Intelligence",
  "address": "850 Brannan Street",
  "sf": 80964,
  "date": "2026-09",
  "semantics": "sublease_in_rsf",
  "source": "https://therealdeal.com/san-francisco/2026/09/30/robotics-company-subleases-airbnb-offices-in-san-francisco/"
 }
]