It's plenty fair. This is why we have lease contracts. The lease protects both the tenant and the landlord for the lease's duration, and contractually obligates

It's plenty fair. This is why we have lease contracts. The lease protects both the tenant and the landlord for the lease's duration, and contractually obligates the landlord to prevent habitable premises while the lease is in force, but the landlord is under no obligation to renew if he wishes to do something else with his property. That's how ownership works. You don't lose ownership just because you choose to rent to a tenant.