I am looking at a much broader area to establish "median value."
For exemple, a whole County, not a whole "street!"
You can do this, and you will quickly develop counties that all the "rich" want to live in, and then develop counties where all the poor will be stuck...then we hear lamentations about divides between the rich and the poor.
And the median value already takes into account the "high" and "low" in any area. I don't want to "punish" anyone. But, although I believe that revitalization of a ghetto area is a good thing, it can easily turn into gentrification fo that area, which is VERY negative, as it take the (inferior, certainly, but still )only home poor people have ever known, and displaces those people with no affordable place to go to. . .while the "new gentry" drives the price up far beyond the original residents' affordability.
Cities push for revitalization because it pushes people out that pay no taxes, pushes people out that drive property values down and replaces them with tax payers (mostly) and allows the area to see an increase in property values and attract new business to the city.
It does a city no good to have multiple ghettos. It also does no one any good to tax people even more on trying to enact a change that only serves to benefit a town and attract new business, and new jobs.