Since then, new Mars Hill locations were added using a multi-campus "meta-church" structure, connecting Driscoll's sermons via high-definition video to the remote campuses during weekly worship services. This format allowed each location to retain local leadership and ministries while under the leadership of the main campus. A fourth and fifth Mars Hill location opened in 2007, and in 2008 a sixth location was added in downtown Seattle. A seventh campus, in Olympia, Washington, opened in Fall 2008 and an eighth campus, the first outside of Washington state, opened in Albuquerque, New Mexico in Fall 2009. The church launched four new churches on January 15 in Portland (Oregon), Rainier Valley (Seattle), Sammammish (near Seattle), and Orange County (California), the same day as the first sermon in the "Real Marriage" sermon series, based on Mark and Grace Driscoll's book, "Real Marriage".