The Staff of State Services Organization (SSO) welcomes you to the Hall of the States. Conveniently located just blocks from the U.S. Capitol and Union Station, the Hall of the States is home to many Washington offices of the fifty states, U.S. territories and associations of state officials. State Services Organization, which manages the 225,000 square feet of office space that make up the Hall of the States, is proud to offer a broad range of services to more than 90 organizations.