SoCal is not just the Mecca of BJJ in the US, I think it has become the Mecca of BJJ in the world. IBJJF Worlds has been held in Long Beach, CA since 2007. (And was last weekend!)
But, I also submit that the NY area is the central place for jiu jitsu on the US east coast.
But, I also submit that the NY area is the central place for jiu jitsu on the US east coast.