A commissioner of an authority may not be an employee of the authority. If an authority is governed by articles of organization, only one commissioner of the authority may be an employee of the political subdivision. Otherwise, a commissioner of an authority may not be an employee of the political subdivision. A commissioner of an authority may not be an elected official of the political subdivision. This subtitle does not bar a tenant of a housing project or of property included or planned to be included in a housing project from being a commissioner of an authority.