No portion of the post office block is within a cvc. The project was a two block project with a second tower across the street that I believe was within a cvc. I actually forget the exact location of the 2nd block, but it was across the street. One was stated to be 40 floors and 550 feet, while the other was planned as 37 floors and 480 feet.
This was the shorter tower. The project was being planned by Novare, which is the same group that developed 360 Condos.
http://www.theprestonpartnership.com/project/ovation/
Here's the map. You can see that the block isn't inside a cvc.
ftp://ftp.austintexas.gov/LURTrainin...0Corridors.pdf