Another observation... the overal site plans show the large, sprawling 2-3 story IBM building (closest to the Burnet/Braker intersection) integrated into their 5-10+ year plans? I'm assuming IBM still owns and operates this structure?
EDIT: Here is a Massing/Conceptual Plan for The Domain. Notice the tall 25-30 floor tower in the center, and the existing retail center along Mopac, on the right-hand side of the image
From Nelsen Partner's website...
http://www.nelsenpartners.com/
Site Plan... Existing Domain retail complex at the bottom center, along Mopac, and the aforementioned IBM building at the top-right corner (light red):
