While you may expect long-term housing price to rise, experts like Kevin Corish recommend that property owners invest for income instead of short-term capital growth. To compare different property's values use their yield (i.e., the annual rent received as a percentage of the purchase price). For example, a property delivering £10,000 worth of rent per year that costs £200,000 has a 5% yield. Rent should be the key return for buy-to-let.