Is the United Club at SAN before or after security? Both united.com and the SAN website say "mezzanine level" but I don't know whether that's before or after security.

I am looking for a place to meet with a friend after a flight. He is arriving on Alaska from SEA and I am arriving on United/Continental from IAH, so I am trying to figure out whether both (or even one) of us will be able to get to the club.

Thanks!