I wish I could find a way to post it. I've got a spreadsheet file of Austin building heights that I've been putting together for 15+ years. Besides building heights it also includes their completion dates of course, but I also created another sheet listing buildings by decade and by their construction start date. The data came from photographs mostly.
Frost actually finished in 2004. It was topped out in June of 2003. I remember watching Back to the Future in Republic Square Park at their "Movies in the Park" showing, and I could look over and see the building before they started putting on the crown. They even had the mechanical penthouse lit up and I could see the tree on top signifying it had been topped out. I also distinctly remember the sound from the movie echoing off the Intel Building's shell. That would have been right around the time they halted construction, or just before it. Frost started in 2001. My brother and I went with Greg from the forum and sat in the back of Greg's truck and watched them put up the cranes for the building right across Brazos. The building broke ground on November 27, 2001, which I'll never forget since it was my 21st birthday.
300 West Sixth broke ground in March of 2000. I remember in 1999 when the rendering was posted on the forum by
CTroyMathis. It was finished in 2002.