This rendering is from wwmiv's Austin Tower's link. 1801 Congress looks decent for a government building.
I was confused when I read the Austin Towers article. It indicates that the State is just now looking for engineers and architects to design the building. Articles from earlier this year about the music museum said 1801 Congress would be starting soon. The TFC website had the groundbreaking scheduled as this past 05/30 and the Notice to Proceed with excavation is set for this August. The only way this all makes sense is that site prep and excavation will be taking a long time, and they will designing the buildings while site prep and excavation is taking place.