---
schema_version: "secwatch.filing_event.v1"
accession: "0001888524-26-016518"
form_type: "8-K"
ticker: null
cik: "0001840121"
company_name: "BANK 2021-BNK31"
filed_at: "2026-09-02T13:17:44+00:00"
generated_at: "2026-09-02T13:19:27.193888+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.5
calibrated_materiality_score: 0.5
confidence: "high"
source: SEC EDGAR
---

# C-IV AM acquires Greystone's special servicing portfolio; becomes special servicer for BANK 2020-BNK30 loans

## Summary
- Greystone sold special servicing division to C-IV AM effective Sept 1, 2026; C-IV AM assumes duties for 605 Third Avenue and McDonald's Global HQ loans.
- Portfolio: ~60 transactions, $20.7B UPB, 1,928 loans; 33 CMBS deals with $14.2B.
- Active special servicing: $2.1B across ~108 assets as of 6/30/2026.
- C-IV AM rated MOR CS2 (Morningstar DBRS) and CSS2 (Fitch); on S&P Select Servicer list.
- No servicer event of default; financial condition not expected to impact performance.

## SEC filing metadata
- accession: 0001888524-26-016518
- form_type: 8-K
- cik: 0001840121
- company_name: BANK 2021-BNK31
- filed_at: 2026-09-02T13:17:44+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.5
- calibrated_materiality_score: 0.5
- confidence: high
- sec_items: 6.02
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1840121/000188852426016518/0001888524-26-016518-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1840121/000188852426016518/wcm21b31_8k-09012026.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001888524-26-016518
- JSON: https://secwatch.observer/filing/0001888524-26-016518.json
- Plain text: https://secwatch.observer/filing/0001888524-26-016518.txt

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