Researching housing policy requires a mix of sources. In addition to law, a number of social science disciplines like sociology, political science and even economics need to be considered. Interdisciplinary databases are a good place to start.
Housing is such a multi-faceted issue that you need to narrow your research to a specific element of policy. A great way to do this would be to look towards a database's Advanced Search options, letting you combine different keywords to find only articles with every search term, like housing AND discrimination.