FWIW: here are the 2007 census numbers (in percentages) for ownership nationwide. Reading from left to right across the row, we have the total, then the five quintiles based on HH income from lowest to highest. There’s a big skew to the high side, for sure, but also a surprisingly high proportion of owners on the lower end too. My sense (though I don’t have data) is that SD would skew even more to the high side given the comparatively high prices and low wages here. Still, its hard to see how the 75th pcntl is any more than a theoretical upper bound, since it assumes 100% ownership for those above the median and 0% ownership for those below. Of course the 50th pcntl is wrong too. The numbers below suggest the ownership percentile is about the 68th (plus the SD skew, minus the equity).