There are two possible notices of termination you can serve to your tenant:
The first notice is Form N5 - Notice to End your Tenancy Early for Interfering with Others, Damage or Overcrowding. You can serve this notice to your tenant if your other tenants in the building are complaining, damage is being caused in the rental unit, the condo management is complaining about the constant turnover of people in your unit, or your tenancy agreement does not allow the tenant to rent the unit on a short-term basis. This notice is a 20 day notice to end the tenancy, but it allows the tenant to correct the situation within seven (7) days.  If they do not correct the situation in seven (7) days, you can file an application with the Landlord and Tenant Board as early as the 8th day.
If the tenant is collecting more rent from the Airbnb renters than what the tenant is paying you each month for rent, this is considered illegal act. In this case, you can serve your tenant with Form N6 - Notice to End your Tenancy for Illegal Acts or Misrepresenting Income in a Rent-Geared-to-Income Rental Unit.  This notice is also a 20 day notice to end the tenancy (Reason 2), however, the tenant is not given an opportunity to correct the situation.  You can file an application with the Landlord and Tenant Board right after you provide your tenant with this notice.
In either case, you should collect as much evidence as possible.  For example, print-outs of the advertisements on the Airbnb website showing your unit, proof of what the tenant is charging to rent out your unit and complaints from other tenants or condo management.  It is important to fill in as much detail as possible about the tenant’s behaviour in the Details About the Reasons for this Notice section of each form.
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