The poorest in the US can't find housing even as low-income units sit empty

The poorest people in the U.S. face the most acute shortage of affordable homes. That’s partly because the majority of low-income housing financed in recent years has been for those earning at least 50% of an area’s median income. Now, some cities are seeing an uptick in vacancies in these units as their rents approach those of market-rate apartments. As…