Basically, I believe you can't do nothing unless you have written certain terms in the lease. Normally, landloards all have something in lease like "if tenant decides not to renew a lease, landlord will have the right to enter the room in the last two months before lease termination in order to show the room to potential new cutomers..."
If your tenant gives you the consent, he is doing you a favor...
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Other reasons for eviction
There are some other reasons for eviction that are not related to what the tenant has done or not done. For example:
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- the landlord wants the rental unit for their own use or for the use of an immediate family member or a caregiver,
- the landlord has agreed to sell the property and the purchaser wants all or part of the property for their own use or for the use of an immediate family member or a caregiver,
- the landlord plans major repairs or renovations that require a building permit and vacant possession,
- the landlord plans to demolish the rental property,
- in a care home that is occupied for the sole reason of receiving therapy or rehabilitation, the tenant’s rehabilitation or therapy program has ended,
- a tenant of a care home needs more care than the care home can provide, or no longer needs the level of care provided by the landlord.
http://www.ltb.gov.on.ca/en/Key_Information/STEL02_111677.html
Landlord has rights too, I would evict the renter if I choose to sell the house. It shows better.
And if you only rent out a room not a unit, since it is a shared accomadation , you could let them go at anytime with a written notice.