5000 units, and you think that's a lot? Last year in Warsaw (which is smaller than SF) there were almost 20,000 new apartments built. You now see how much impact all those zoning laws have.
According to Wikipedia SF City and County has a population of 870k, Warsaw 1.8 million. The metro area 4.6M vs 3.1M respectively. So I'd say the same ballpark. That said 5000 units seems like nothing at these population sizes. I live near Wrocław (650k city population, 1.1M metro), there were 10.000 new units in 2016 and this year will be similar. And this number doesn't include private investments (people building a house for themselves), only housing built by developers and sold on the market.
