I don't think I have one of the 1990's but I had one that I posted somewhere in the Austin section of the first ACL Festival which was 2002 and right before Frost was built. I can't think of anything that was built from 1990 to when Frost was built. Maybe the condos on Lamar by Idea City where Ann Richards lived?
I'll see if I can find that photo from the first ACL Fest. It is on this forum somewhere, but probably buried pretty deep in the Austin section.
Edit: In other words all the tall buildings started popping up when Kevin jointed the forums. Coincidence? I think not.