Would you buy a property that already has tenants

[Luther A.]

I found a property for 45K that already has paying tenants. The property has been on the market for over 18 months. There are no pics of the inside of the house only outside. The outside pics look good. I have done the numbers and I'll be getting at least a 12% ROI on this property. So it will cash flow.

This seems too good to be true. I don't understand why the owner would be selling something like this unless there is something wrong with the property or tenants. What do you guys think?