Tennessee Laws: Terminate Tenant's Lease to Owner Occupy

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For the East Tennessee landlords, 

I'm about to buy a nice off-market duplex Johnson City, TN, but both units are tenant occupied. I want to owner occupy one unit. 

Not knowing TN law that well (yet), how could I best go about this? 

Am I forced to let one of their leases expire? Can I give one a free months rent in exchange for moving out in 30 days? Can I evict one of them since ownership is changing hands? 

Path of least resistance is preferred.