Always worth remembering that, at least for property prices, "being down 10%" doesn't mean that 1y they were worth 100 and this year are worth 90, but that 2y ago they were worth 100, 1y ago they were worth 110, and this year they are worth 119. In other words we often talk about "the % year on year increase is down", not "the value of the house is down".
Can you point to a single usage in the context of property prices where "being down X%", without specifying that X is referring to a YoY increase, means what you say?
