Dover Downs is a hotel, casino, and racetrack complex in Dover, Delaware. It has a .625-mile (1.006 km) harness horse racing track, which is surrounded by Dover International Speedway, a 1-mile (1.6 km) concrete track used for NASCAR motor racing events. The speedway is owned and operated by Dover Motorsports. The rest of the Dover Downs complex is the property of Dover Downs Gaming & Entertainment (NYSE: DDE), which will merge and be purchased by Twin River Worldwide Holdings in late 2018.Primary features of Dover Downs Hotel & Casino include a hotel, dining options, over 2,700 slot machines, 40 table games, and the Rollins Center, an 18,000-square-foot (1,700 m2) multipurpose ballroom which features entertainment as well as hosting business conferences, conventions and banquets. Steelman Partners were the original architects and interior designers in 1995.A hotel expansion in autumn 2007 added 268 additional rooms, including 52 suites and 11 spa suites, for a total of 500 hotel rooms. This made Dover Downs the largest hotel in Delaware. Toppers Spa/Salon opened in the hotel on December 29, 2007.Dover Downs began a venture into the online gambling realm in late 2013.