These numbers, though, don't convey the rise and spread of out-of-reach real estate quite like the below animation does. This map from Trulia tracks the methodical advance of million-dollar homes from the San Francisco neighborhoods where they've long been common to parts of the city that are newly becoming inaccessible. In some neighborhoods where a small fraction of homes five years ago were worth a million, a majority are today. These red dots represent homes that Trulia has valued at seven figures or more, not necessarily homes that have sold at that price:
That picture captures what long-time residents no doubt experience as an advancing threat with its own front lines (the blood-red visual certainly aids the impression of a contagion). And in the next five years? There's not a lot of city left, especially in this city that has long struggled to expand as the demand to live there has.