Let the seller rent the home from you?

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Hi everyone, I'm working on my first investment property and have been reading some books that mention that it would be a bad idea to rent the home back to the seller from whom you are buying.  Is this good advice or is it common practice to rent the home back to the person you are purchasing from?  My initial thought would be to help someone avoid foreclosure by purchasing their home but not have to leave their home (assuming that things were back on the up and up for them).  Any thoughts?