As of September 2005, Madison Square Garden's current owner, Cablevision, has plans to build a fifth Garden.  For hockey, Madison Square Garden seats 18,200; for basketball, 19,763; and for concerts 20,000 center stage, 19,522 end-stage.  Madison Square Garden, often abbreviated as MSG, known colloquially simply as The Garden, has been the name of four arenas in New York City, United States.  Madison Square Garden features 20,976 square feet (1949 m²) of arena floor space.  Madison Square Garden is also known for its place in the history of boxing.  Many of boxing's biggest fights were held at Madison Square Garden, including many of Joe Louis, the Roberto Duran-Ken Buchanan affair, and the first and second Joe Frazier-Muhammad Ali bouts.  Subsequently a new 20,000-seat Garden was built at 50th Street and 8th Avenue, and the current Madison Square Garden is at 7th Avenue between 31st and 33rd Streets, situated on top of Pennsylvania Station.  The arena lends its name to the Madison Square Garden Network, a cable television network that broadcasts most sporting events that are held in the Garden.  The first two were located at Madison Square, thus the name.  The present Madison Square Garden hosts 320 events a year but it is best known as the home of the New York Knicks of the NBA and New York Rangers of the NHL.  There have been four incarnations of Madison Square Garden.