Since the mid-1990s, most new market-rate housing in California has been of the single-family detached (SFD) variety. Under traditional assumptions, these units should be generating school-age children at a predictable rate — because they would be occupied by families with a predictable number of children. But when single-family homes represent the only housing being built, those assumptions might go out the window. All types of households might occupy the new houses. And that r