How to approach rent to own owner

[Lynn Por]

Hi 

After absorbing the knowledge and mindset of investor for awhile ,  I started to aware that primary residency is not considered  a good asset . My husband and I decided to downsize  our home to smaller single family home in the same  neighborhood . 

I encountered a rent to own house in my neighborhood which I tnink is a perfect size for us. 

I wanna to approach the owner but I am not sure what is the best strategy for me. This is the situation , it is still a buyer market over here in Naperville IL . 

The house is a 3 bed room house at the market value of 300K to 350 K. 

We can sell the current house and  pay cash up to 250 K and have no mortgage . Or should I convince the seller finance straggly ?i am not familiar with the seller finance . From the bigger pocket , I read that the bank won't allow loan assumption if the loan is the recent one ?

Since the owner has the sign of rent to own , I would like to hear what is the best strategy for me . the primary resident house will be funded by my spouse and it does not affect my reserve for other properties investment . But if the loan assumption strategy allows me to loose up more cash , we would be happy to do that if the purchase price  still make sense . 

I look forward to your advice 

Lynn