This video goes through some of the things you should consider before purchasing a property that is already tenant occupied.

1:35 - Screening the Tenant
2:59 - Questions to ask the Tenant
3:43 - Questions to ask the Owner/Manager
4:54 - Understanding your obligations to the lease in place
6:11 - Immediately Income Producing
6:46 - Repairs
9:08 - Rent compared to Market