The New York Times reports that multifamily construction—apartment buildings—is leading the recovery in construction. Construction of single-family homes is only a third of the way up from its fall from its earlier heights, while multifamily construction has recovered two-thirds of its peak. Young adults are moving out of their parents’ homes, but instead of buying homes, they’re renting apartments.

Houston is adding thousands of new units, leading to a fear of overbuilding. Rents have been rising, but as the supply of apartment units rises, higher rents may be unsustainable. However, during the recession, young adults did not move out of their parents’ homes, leading to about two million doubled-up households. David Crowe, the chief economist of the National Association of Home Builders, noted that “all of the net addition to households since 2004 has been in rentals.”