Seller becomes tenant until new property purchased

[Travis Hargreaves]

My real-estate agent just informed me of a deal in which a property is for sale with a unique situation. This property has a seller who wants to sell now, but is still looking for a house in a nearby town and would like to live in the current house as a renter until she finds a new property. The sales price is $189,900 with comps of $237,000 and average rental prices in that area as $1300. It does require work once she moves out, which we still have to estimate the cost in our scope of work. I have just never heard of a situation of this nature. I like the uniqueness of it and would like to help her situation, but I am curious of the motivation to sell and still live there a while longer, instead of waiting until she finds a house and then sells her own home. I know there is not a lot of inventory in the area she is looking at, it just seems unique. Any suggestions in this situation would be much appreciated.  Thank you.