---
schema_version: "secwatch.filing_event.v1"
accession: "0001104659-23-125716"
form_type: "8-K"
ticker: "SLS"
cik: "0001390478"
company_name: "SELLAS Life Sciences Group, Inc."
filed_at: "2023-12-13T23:59:59+00:00"
generated_at: "2026-06-07T13:23:35.025209+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.2
calibrated_materiality_score: 0.2
confidence: "high"
source: SEC EDGAR
---

# SELLAS extends NYC office sublease term to Sept 2025; annual rent $635K from Jan 2025

## Summary
- Second Amendment to Sublease extends term from Dec 30, 2024 to Sep 30, 2025.
- Annual rent for Jan 2025–Sep 2025: $635,250 ($52,937.50/month); Dec 31, 2024 rent is $0.
- Premises deemed 8,470 rentable sq ft; accepted in 'as is' condition; no landlord work.
- Security deposit of $225,000 to be transferred to new sublandlord Times Square Tower Associates LLC.
- Electricity to be paid based on metered consumption plus 3% administrative charge.

## SEC filing metadata
- accession: 0001104659-23-125716
- form_type: 8-K
- ticker: SLS
- cik: 0001390478
- company_name: SELLAS Life Sciences Group, Inc.
- filed_at: 2023-12-13T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.2
- calibrated_materiality_score: 0.2
- confidence: high
- sec_items: 1.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1390478/000110465923125716/0001104659-23-125716-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1390478/000110465923125716/tm2332783d1_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001104659-23-125716
- JSON: https://secwatch.observer/filing/0001104659-23-125716.json
- Plain text: https://secwatch.observer/filing/0001104659-23-125716.txt

## Key facts
- Material Agreements
  SELLAS Life Sciences Group, Inc. amended Second Amendment to Sublease with Times Square Tower Associates LLC (effective 2023-12-11).
  - Action: amendment
  - Agreement: lease
  - Counterparty: Times Square Tower Associates LLC
  - Effective: 2023-12-11
  source text: SELLAS Life Sciences Group, Inc. (the “Company”) entered into a Second Amendment to Sublease (the “Sublease Amendment”), dated December 11, 2023, with Times Square Tower Associates LLC (the “Sublandlord”), which Sublease Amendment amends that certain Sublease, dated as of June 5, 2020 (the “Original Sublease”)
  evidence_url: https://www.sec.gov/Archives/edgar/data/1390478/000110465923125716/0001104659-23-125716-index.htm

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