---
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"
generated_at: "2026-06-20T18:51:28.866960+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.35
calibrated_materiality_score: 0.35
confidence: "high"
source: SEC EDGAR
---

# Keros amends lease for 35,662 sq ft in Lexington; 8-year term, base rent $202K/mo

## Summary
- 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.

## SEC filing metadata
- 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
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.35
- calibrated_materiality_score: 0.35
- confidence: high
- sec_items: 1.01
- 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

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001664710-23-000003
- JSON: https://secwatch.observer/filing/0001664710-23-000003.json
- Plain text: https://secwatch.observer/filing/0001664710-23-000003.txt

## Key facts
- Material Agreements
  Keros Therapeutics, Inc. amended Lease Amendment with Revolution Labs Owner, LLC (effective 2023-01-06).
  - Action: amendment
  - Agreement: lease
  - Counterparty: Revolution Labs Owner, LLC
  - Effective: 2023-01-06
  source text: 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_url: https://www.sec.gov/Archives/edgar/data/1664710/000166471023000003/0001664710-23-000003-index.htm

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.