---
schema_version: "secwatch.filing_event.v1"
accession: "0001628280-25-033784"
form_type: "8-K"
ticker: "FHTX"
cik: "0001822462"
company_name: "Foghorn Therapeutics Inc."
filed_at: "2025-07-01T23:59:59+00:00"
generated_at: "2026-05-18T10:25:11.076609+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.6
calibrated_materiality_score: 0.6
confidence: "high"
source: SEC EDGAR
---

# Foghorn Therapeutics signs new 9-year lease for 72,846 sq ft HQ in Watertown, MA, terminates Cambridge lease

## Summary
- New lease at 99 Coolidge Avenue, Watertown for 72,846 sq ft; annual base rent starts at $87/sq ft with partial abatement in years 1-2.
- Rent commencement expected October 1, 2026, followed by 3% annual escalations starting October 1, 2027.
- Terminates 81,441 sq ft lease at 500 Technology Square, Cambridge (originally through Sept 2028) via Lease Termination Agreement.
- Security deposit of $2 million; two 5-year renewal options; space for HQ and R&D operations.
- Early occupancy of office portion targeted for December 15, 2025, with full delivery of build-out by December 15, 2025.

## SEC filing metadata
- accession: 0001628280-25-033784
- form_type: 8-K
- ticker: FHTX
- cik: 0001822462
- company_name: Foghorn Therapeutics Inc.
- filed_at: 2025-07-01T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.6
- calibrated_materiality_score: 0.6
- confidence: high
- sec_items: 1.01, 1.02, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1822462/000162828025033784/0001628280-25-033784-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1822462/000162828025033784/fhtx-20250627.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001628280-25-033784
- JSON: https://secwatch.observer/filing/0001628280-25-033784.json
- Plain text: https://secwatch.observer/filing/0001628280-25-033784.txt

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