No San Francisco neighborhood has so squarely positioned itself at the epicenter of opposition to rising housing costs than the Mission District. Of course, housing un-affordability is but one of many rapid changes in the neighborhood, and seeking legislative action is but one response (sidebar: remember when protestors were blocking tech shuttles?) — and median home prices have soared 76% citywide since 2011! For now, let’s take a focused look at some of the real estate sales dynamics in the Mission. …