When foreign buyers tax came in, prices "dropped" but only theoretically. Prior to march 2017, prices spiked as people tried to beat the deadline. After march 2017 they returned to prices ~six months before. If a correction only corrects out a few months of fake appreciation, I don't consider it real. I like to think of corrections in terms of years of regression as opposed to percentages as I believe that is more reflective of reality (and the pain that owners may feel). The correction in the 80's had some people underwater for a decade. Recent corrections have been months of fake gains disappear (which hurts people that bought in those months and immediately need to sell but that is a very small percentage of owners). If you start getting regression of five years or more, you probably have a decent percentage of homeowners but they have been paying down principal so they are mostly still above water.