I’m currently a buyer under contract with an option that seller has 3 months to find a place to live. They’ve had a few offers rejected and have indicated that having more cash in pocket would help. Around the same time I reached out to my agent suggesting a leaseback would protect me from them backing out of the sale after the three months. It sounds like both sides are amenable to the leaseback, and most of what I’ve read so far is that a typical rent covers PITI. Would it be unreasonable to ask for PITI + 10% or so to put a very modest dollar figure to my willingness to accommodate?