I think its rather problematic now. No lawyer would agree to conclude such deal, bit in several decades it would probably become common practice
It will become very common in the future, but right now is not the moment to try that not only there is not regulation in place to do that but also the price of bitcoin is really low and it is not the time to be buying a house with it, right now is the time to hold our coins and to only sell once the price has skyrocketed or has at least recovered from the crash we suffered.