One of the world's most famous addresses is up for sale right now. It's 1600 Pennsylvania Avenue. But it's not the White House. This piece of real estate is down the street from where the President and First Family lives. It's 1600 Penn in Southeast D.C. Years ago, it was known for its drug addicted tenants. But as News4's Mark Segraves shows us, the property is being redeveloped with promises of a brighter future.