venues Downtown Houston has two major league sports venues. Minute Maid Park, opened in 2000, is home to MLB Houston Astros, and the Toyota Center, opened in 2003, is home to the NBA Houston Rockets. From 2004 to 2007, Toyota Center was also home to the now defunct WNBA Houston Comets. The Theater District is one of the largest in the country as measured by the number of theater seats. Houston is one of only five cities in the United States with permanent professional resident companies in all of the major performing art disciplines of opera, ballet, music, and theater. Venues in the theater district include the Wortham Center (opera and ballet), the Alley Theatre (theater), the Hobby Center (resident and traveling musical theater, concerts, events), the Bayou Music Center (concerts and events) and Jones Hall (symphony). The George R. Brown Convention Center is located on the east side of Downtown, between Discovery Green and Interstate 69, and contains of convention space and two adjoining hotels. In the mid-2010s, the promenade between the Center and Discovery Green was transformed into Avenida Houston, a mixed-use corridor featuring restaurants and retail spaces. Hotels and accommodations Major hotels in downtown Houston are: Hilton Americas Convention Center Hotel Marriott Marquis Houston Four Seasons Hotel and Residences JW Marriott Downtown Houston Doubletree Hotel Downtown Houston Hyatt Regency Houston, which features a revolving restaurant, the Spindletop, located on the hotel's 30th floor. The Whitehall Club Quarters Hotel Courtyard Houston Downtown (Marriott) Residence Inn Marriott Westin Hotel SpringHill Suites Marriott Hotel Alessandra Boutique hotels include: The Lancaster Magnolia Hotel Hotel Icon (Marriott) The Sam Houston Hotel Retail and restaurants The Shops in Houston Center, located within the Houston Center complex, is an enclosed shopping mall. A few blocks away, GreenStreet is an open-air shopping center. The Houston Downtown Tunnel System is also home to many shops and restaurants. Several restaurants in Downtown Houston are in the Tunnel system, only open during working hours. Katharine Shilcutt of the Houston Press said in 2012 that because of the Houston tunnel system taking traffic during the daytime and many office workers leaving for suburbs at night, many street level restaurants in Downtown Houston have difficulty operating. She added that the popularity of business-related lunches and dinners resulted in steakhouses in Downtown becoming successful. Fitness centers Downtown hosts a branch of the YMCA, featuring a center for teenagers, a wellness center