Off or Off-Off Broadway?

You hear about Off-Broadway and Off-Off-Broadway, right?  I always figured it had to do with small or low budget productions or shows working on improving their plots and staging. These shows weren't ready for the main Broadway drag so were housed a few blocks away, in lesser-known theaters.  I was wrong.  It's all about seating capacity. If a theater has 100 to 499 seats, it's considered Off-Broadway.  If there are less than 100 seats, it's called Off-Off Broadway!