As I understand it the Avengers Academy is currently housed in the West Coast Avengers former base.
Actually, "currently" there is no Avengers Academy. Hank and Tigra disbanded it after last issue, as the only reason the kids were in danger was that they attended a school called "Avengers Academy". Although. I'm sure the Academy will return in one form or another after AvX.
But pedantic corrections aside, yeah, the Academy has been based out of the old WCA compound since issue 21.