What you're basically talking about is retaining a "life estate" in your property. As Ray mentioned, the willingness of someone to do that would be dependent in a significant part, on your age.
Back in my attorney days I represented the bankruptcy trustee for the broker of what was then a very large real estate firm. That broker somehow found a woman in her 90s who owned a house out on Perkins Lane in Seattle. He cut a life estate deal with her that he would pay her money each month which would allow her to live there until she died. I don't remember the number for certain, but I think it was at least $2,000 a month, and this was over 20 years ago, so that was a fairly good sum. In your case though, what you're talking about would be more of an upfront investment, so that would make it more difficult to find someone.
If you do find someone willing to do this, make sure you hire your own attorney to set it up properly.