Me and my husband rent this house that I would say is about 40-50 years old. I think it has been added to. In about the same place in the kitchen and in the bathroom, they parallel each other, there is a vertical crack along the walls. What does this usually indicate and how can it be fixed. Is it foundation? Reason I ask is this could be an owner finance home it has about 1-1 1/2 land to it. Is this something the owner would have to fix before he sells it?