House prices have fallen for a seventh consecutive month, with the speed of the decline tracking at the fastest pace in 40 years, according to a property research group. newsiviewlistenLoading ABC NewsNews Home'Largest property downturn in 40 years' in sight as house prices fall for seventh timeShareShare article'Largest property downturn in 40 years' in sight as house prices fall for seventh timeTopic:Property Prices.