Except that that doesn't work when you're advertising housing in Florida and you want to advertise to people in the Northeast who want to retire somewhere warm but not people in the South who already live somewhere warm.
It is almost as if we have geographic areas larger than zip codes such as cities, states, regions, that can be targeted without running afoul of laws about targeted advertising of real estate.
If you exclude all of Oakland specifically because it's full of minorities, you're discriminating based on race. If you exclude one tiny neighborhood because it's on the other side of a mountain and is physically a part of a different area than it's administratively a part of, you aren't. Granularity isn't the problem.
And state or regional real estate advertising doesn't work because basically nobody in San Francisco is looking for housing in Los Angeles or vice versa, much less San Francisco and Phoenix.
