There are no local affordable housing projects that would be impacted if the tax overhaul bill at the federal level eliminates the tax-exempt status for private activity bonds that help fund that type of construction, but it would remove a potential option.  Mid-Columbia Housing Authority executive director Joel Madsen says they have not utilized the bonds in their projects and they tend to be used for larger projects than we have seen here, but he notes housing advocates don’t want to see any options taken away, and want Congress to preserve three different programs.  Officials with the housing authority in Portland say the U.S. could lose nearly one million units of affordable housing over ten years if the final bill eliminates the tax-exempt status for private activity bonds.