The best advice I would give you to estimate the value of the house x years from now is to simply put a spread sheet together that illustrates it for you. Run the estimation 10 years out. In any given year or years use a depreciation or appreciation rate that mimics what you think will happen. For instance, for this property perhaps run a depreciation of say 5% a year for a few years. Then a few years out start running an appreciation rate of 2-3% for a year or two, then pick it up to 4% and see how long it takes you to get back to your selling price. The entire exercise is much easier then it sounds.
