Two Sundance Square buildings called 420 Throckmorton and Carnegie Building were both designed by David M. Schwarz and HKS, Inc. The 420 Throckmorton building features 207,600 sq. ft. of prime office space. The design of the structure features red brick with cast stone trim on the office tower, which will be compatible with Sundance West, diagonally across the street. The parking garage has a retro Art Deco look on the 3rd Street side with a large neon sign to mark the entrance. The parking garage is called the 3rd Street Garage.

FMG developed a comprehensive graphics look for the 420 Throckmorton tower, Carnegie Building and adjacent parking structure.