72000
According to answers.com, the Alamodome's seating capacity for basketball is 20,662 which can be expanded to 39,500.
Alamodome has a seating capacity of 65,000 people for American football, 52,295 people for baseball, 59,000 people for Canadian football, 20,662 people for basketball, 36,000 people for ice hockey, and 40,000 people when used for boxing.
The Verizon Center has a seating capacity of 20,356 for basketball and 18,506 for hockey.
The seating capacity for basketball at the Thomas and Mack Center is 18,776.
33,000
For a basketball game there is 19309 seats
Brigham young university
Syracuse University (Carrier Dome) capacity: 33,000
The seating capacity of the United Center is just under 22,000 for basketball, 20,500 for hockey and 23,500 for concerts and other events.
The Amway Center has a seating capacity of 18,846 for NBA games and 20,000 for NCAA basketball games.
According to the Toyota Center's website (http://www.houstontoyotacenter.com/about/atozguide.php#S), seating capacity is 18,300 for basketball.
Seating capacities vary for every STAPLES Center event. For basketball, the capacity is 19,079; for hockey it is 18,118. For concerts and other special events, the capacity nears 20,000 guests, depending on the set-up of the event. Check this site: (under S for seating Capacity) http://www.staplescenter.com/doublecol.php?section=guestservices&page=faqs