By the end of our game, it was perhaps half full (with some of the upper sections blocked off by curtains); maybe a little less than that.
An event like this in NYC is tricky. I suspect that most New Yorkers had no idea this tourney was being played. I didn't hear a single ad for it on WFAN, the city's top sports talk station, which would have been the obvious place to advertise it.
Seton Hall is nearby, Va. Tech is pretty close, and there are lots of Big 10 alums in the New York area, so those schools probably made up most of the crowd. There were some Sooner fans there last night, but not terribly many.