Trying to househack, but tenants already in place!

I'm working towards buying a house hack in central Florida, but the handful of properties I've identified as possibilities are all already rented out. I know I have to honor any existing leases (assuming there's no language to the contrary in the lease agreements). But would it be possible to put some language in an offer that says that the purchase is contingent on the current landlord being able to negotiate the release of one of the tenants from their current lease? Are there other ways of approaching this situation? Or do I just need to keep looking for a property that has vacancies?