The Senate will today debate the 21st Century ROAD to Housing Act. Buried in the sprawling legislation is a section reportedly written by Sen. Elizabeth Warren titled “Homes Are for People, Not Corporations.” It has the backing of the White House and broad support in the Senate. The idea sounds politically appealing. In practice, it could sow the seeds of the next housing crash. The provision targets large institutional investors that own single-family rental homes. It effectively blocks investors that own more than 350 homes from buying additional single-family houses except under narrow circumstances. Even those purchases must generally be...