Seller wants to sell, rent with option to buy back

[Silvica Rosca]

Hi everyone. I've been following the podcast and forums for a while now and have question. A seller contacted me recently. He wants to sell me his house, but rent from me with the option of buying it back in the future. This is my first time with this scenario. How should I go about comping the property and determining an asking price? The property is in a high value area in Southern California.