This had to have happened in just the last couple of weeks -- Google has updated the satellite maps for the The Rivers School campus, and it now includes the Athletics Center:
We're pretty sure this is a Saturday in Spring 2005 since the baseball field is not yet been moved beind behind Maintenance. It looks like the site has shifted a bit under my model (see the roof edges sticking out from under the walls?), so I'll have to try to snap-shot and export the model again, see if I can get it to line up better.
It's interesting that there was about two years from the time of the satellite photo to its incorporation into Google Earth.