{"schema_version":"secwatch.filing_event.v1","accession":"0001664710-23-000003","form_type":"8-K","ticker":"KROS","cik":"0001664710","company_name":"Keros Therapeutics, Inc.","filed_at":"2023-01-06T23:59:59+00:00","discovered_at":"2026-05-14T18:03:46.063703+00:00","generated_at":"2026-06-20T18:51:28.866960+00:00","sec_items":["1.01"],"event_type":"other_material","sentiment":"neutral","materiality_score":0.35,"calibrated_materiality_score":0.35,"confidence":"high","headline":"Keros amends lease for 35,662 sq ft in Lexington; 8-year term, base rent $202K/mo","bullets":["Phase A (31,991 sq ft) delivered Jan 4, 2023; Phase B (3,671 sq ft vivarium) due by May 1, 2023.","Base rent starts earlier of 8 months post Phase B or 11 months post Phase A delivery.","Initial monthly base rent $202,084.66, escalating ~3% annually.","Lease term is 8 years from Phase A commencement.","Landlord is Revolution Labs Owner, LLC; premises at 1050 Waltham St, Lexington, MA."],"urls":{"canonical":"https://secwatch.observer/filing/0001664710-23-000003","json":"https://secwatch.observer/filing/0001664710-23-000003.json","markdown":"https://secwatch.observer/filing/0001664710-23-000003.md","text":"https://secwatch.observer/filing/0001664710-23-000003.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/1664710/000166471023000003/0001664710-23-000003-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/1664710/000166471023000003/kros-20230106.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-06-20T18:51:28.866960+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":[{"claim_id":"50136103df870798e25217708e297533b23a313c","claim":"Keros Therapeutics, Inc. amended Lease Amendment with Revolution Labs Owner, LLC (effective 2023-01-06).","evidence_excerpt":"On January 6, 2023, Keros Therapeutics, Inc. (the “Company”) entered into a first amendment (the “Lease Amendment”) to that certain indenture of lease, dated September 7, 2021 (as amended, the “Lease”) with Revolution Labs Owner, LLC, a Delaware limited liability company (the “Landlord”), with respect to the Company’s office and laboratory space consisting of approximately 35,662 square feet located at 1050 Waltham Street, Lexington, Massachusetts (the “Premises”).","evidence_source":"SEC 8-K Item 1.01/1.02","evidence_url":"https://www.sec.gov/Archives/edgar/data/1664710/000166471023000003/0001664710-23-000003-index.htm","confidence":0.9,"family_label":"Material Agreements","details":[{"label":"Action","value":"amendment"},{"label":"Agreement","value":"lease"},{"label":"Counterparty","value":"Revolution Labs Owner, LLC"},{"label":"Effective","value":"2023-01-06"}],"fact_type":"material_agreement"}],"license":"Source filings: public domain (SEC EDGAR). Summaries (headline + bullets): CC-BY-4.0; attribute https://secwatch.observer"}