Since I was analyzing Ben's MLS data rather than the Warren Group data my "quick and dirty" estimate was that most real estate values dropped approximately 16% (Ben's change in median) with a margin of error of 5%. That would mean that most real estate dropped somewhere between 10% and 20% (rounding to the nearest 5% so as not to imply that the estimate of the median was accurate to 1%). I am doing more detailed analysis which may result in a better estimate.