To get at what is occurring you probably need to show it in price bands. say top/bottom and middle third of real estate prices. How much volume at each and trends in each.
What I'm saying is the real estate market has very different characteristics in the low, medium, and high end. So the top third, middle thirds and bottom thirds should be broken out and you can't use median for the market as one sample set.
I agree that it can be misleading but it's the most common statistic used to describe the health of a real estate market. I think that's because it's rather robust to outliers. But, as we show in the post above, it's not robust to tightening / loosening of the price bands above and below median (e.g. median went down last month but the 1st quartile went up).
I'm not advocating for any other single-number analysis presentation, nor do I think the median number is totally meaningless, but you're leaving a lot of data out in the name of creating a simple chart without asking if it's informative.