# Form LTB-COS-L10: Certificate of Service: Serving a Former Tenant (L10)

Ontario Landlord and Tenant Board.

Used for: Records how and when the landlord served an L10 application, Notice of Hearing or other document on a former tenant, or a tenant no longer in possession.

## Official source
- Form file: https://tribunalsontario.ca/documents/ltb/Other%20Forms/Certificate%20Of%20Service%20-%20L10.pdf
- Source page: https://tribunalsontario.ca/ltb/forms-filing-and-fees/
- Version: 2022-04-01
- Last checked by Router.law: 2026-10-19

## Only the person can do
- The person who served the document signs the certificate. Router.law does not sign anything.

## Fill it with Router.law
- REST: POST https://router.law/v1/forms/LTB-COS-L10/fill (API key)
- MCP: https://router.law/mcp, tool fill_form with form_id "LTB-COS-L10"
- Questions and input schema: get_form_spec("LTB-COS-L10")
- Docs: https://router.law/docs

Router.law spec status: draft. Router.law returns the filled form for a person to review. It never files anything and does not give legal advice.