{"schema_version":"secwatch.filing_event.v1","accession":"0001447362-21-000262","form_type":"8-K","ticker":"CSTL","cik":"0001447362","company_name":"CASTLE BIOSCIENCES INC","filed_at":"2021-12-03T23:59:59+00:00","discovered_at":"2026-05-14T18:04:12.616547+00:00","generated_at":"2026-06-28T03:48:14.558965+00:00","sec_items":["1.01","9.01"],"event_type":"other_material","sentiment":"neutral","materiality_score":0.35,"calibrated_materiality_score":0.35,"confidence":"high","headline":"Castle Biosciences extends Phoenix office leases through April 2033, adds 2,564 sq ft","bullets":["3707 Lease amended: term extended 61 months to April 2033; premises expanded by 2,564 sq ft to 17,752 total.","Base rent at 3707 starts at $20.50/sq ft/year ($30,326.33/mo) with annual $0.50/sq ft increases.","3737 Lease amended: term extended 69 months to April 2033; base rent unchanged until Aug 2027 then $23.50/sq ft/year.","Rent abatement for first full calendar month after 3707 expansion commencement.","Lease amendments involve two properties with Landlord Alturas Siete I and II, LLC."],"urls":{"canonical":"https://secwatch.observer/filing/0001447362-21-000262","json":"https://secwatch.observer/filing/0001447362-21-000262.json","markdown":"https://secwatch.observer/filing/0001447362-21-000262.md","text":"https://secwatch.observer/filing/0001447362-21-000262.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/1447362/000144736221000262/0001447362-21-000262-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/1447362/000144736221000262/cstl-20211129.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-06-28T03:48:14.558965+00:00"},"review":{"review_status":"machine_generated","human_reviewed":false,"corrected":false,"correction_note":null,"correction_timestamp":null,"superseded_by":null,"related_filings":[]},"source_grounded_claims":[],"license":"Source filings: public domain (SEC EDGAR). Summaries (headline + bullets): CC-BY-4.0; attribute https://secwatch.observer"}