When he understands that the interest and property taxes you pay are usually tax deductible, he may agree and look into it. Sometimes we have to take the initiative and do the first move. Come with numbers. Show him last year's taxes recalculated with the amount you paid for rent used as mortgage interest and figure out what property and school taxes go for in your area. He may like to see how much you get back. In my opinion, the benefit and return in taxes is higher than the chance of the value going down. This only affects you if you are selling it.