Kamala Harris has proposed a federal rent control scheme to bring down America’s high housing costs. The Netherlands is providing a good example of how that policy might work out in practice. In July, the Dutch government expanded nationwide rent controls—which had already covered about 80 percent of rental units—to almost all remaining rental properties. Fully 96 percent of Dutch rental housing is now subject to rent caps. A report from Bloomberg published last week details the results: Owners of rental properties are selling their buildings and getting out of the rental housing market. The t…