Adding another house to property to make the deal better

[Adam Snow]

Hey BP a family friend has offered to sell me his rental house. It rents for $600 and he is asking $60,000, so not bad. But I think the house is worth closer to $50,000. I do really like the house and would love to get it because I think it would cash flow. So I have been trying to think of ways to make the deal better for me without going down on the price. The house comes with a pretty big backyard so I had a thought about putting a Mobile home in the backyard to add more value and cash flow. Does anyone have any experience with this or does anyone have another idea to make the deal better. Thank you in advance everyone

Without Mobile Home cash flows $150