The Walter E. Washington Convention Center is a convention center located in Washington, D.C., owned and operated by the city's convention arm, Events DC. Designed in a joint venture by the Atlanta-based architecture firm Thompson, Ventulett, Stainback & Associates, Washington, DC- based architects Devrouax & Purnell Architects Planners PC and Mariani and Associates, the convention center is located in a superblock bounded by Mount Vernon Square and 7th, 9th and N streets, N.W. It is served by the Mount Vernon Square station on the Yellow and Green lines of the Washington Metro. It was completed in 2003. The center is noted for its extensive permanent collection of contemporary art, the largest of any convention center in the United States and one of the largest public art collections in Washington outside of a museum, including works by Sam Gilliam, Sol LeWitt, Jaune Quick-to-See Smith, Sarah Sze, and Carrie Mae Weems. Major events Six of the nine official inaugural balls for the 2005 second inauguration of George W. Bush were held at the convention center. In 2006, the Council of the District of Columbia approved legislation naming the then-Washington Convention Center in honor of the city's first home rule mayor, the late Walter E. Washington. In 2008, the WCSA Board of Directors agreed to expand the newly built convention center by . Six of the 10 official balls of the 2009 Presidential Inauguration of Barack Obama took place there, including the first-ever Neighborhood Ball. The center was the principal site of the 2010 Nuclear Security Summit hosted by President Barack Obama. On November 10, 2011, ground was broken on the 14-story Washington Marriott Marquis, a $520 million, four-star, 1,175-room "convention center headquarters hotel" with more than of meeting room space. Also in 2011, the convention center hosted a major fight card with a welterweight championship match between Lamont Peterson and Amir Khan at the Walter E. Washington Convention Center. In 2013, it was announced that the Walter E. Washington Convention Center would be the 5 year host of Otakon, the Japanese and East Asian culture convention that was held since 1999 in the Baltimore Convention Center in Baltimore, Maryland, starting with Otakon 2017 and going at least until Otakon 2021 which was considered to be a "great win" for Washington, D.C.'s convention business with an estimated $25 million annual revenue for D.C. and over 30,000 visitors expected during the time Otakon is