Is this a good deal? Rent-to-Own Purchase

[Tucker Cummings]

Just got off the phone with a gentleman who is wanting to sell his last 2 houses from a 55 house portfolio. I'm a newbie investor so I'm not sure what to think about it. They are currently on a rent-to-own lease option agreement with tenants in place. So I guess I would be buying a property that already has a guaranteed seller later this year for one property and next year for the other and no repair or holding costs since its already rented (which sounds pretty nice now that I'm typing it out). Seller just wants to walk away with 10k/property in his pocket and no ties to the property. I've run my own comps/ARV and looks like I could make a pretty penny by the end (numbers below). I guess my only question or concern is that I've never personally heard of this kind of deal (sale of a lease optioned house) and am wondering if there is someone out there who could offer some counsel.

Property 1:

---Remaining Balance: $80,000

---Current Rent: $890/month

---Purchase Price: $90,000

---ARV: $100,000

Property 2:

--- Remaining Balance: $110,000

--- Current Rent: $1,150/month

--- Purchase Price: $120,000
--- ARV: $160,000

Total: 

--- Remaining Balance: $190,000

--- Purchase: $210,000

--- Current Rent: $2,040

--- Sell: $260,000

--- Profit: $50,000