Minute Maid Park participant Populous
Design and construction
Early stadium sketches from Kansas City-based HOK Sport (now Populous) using the working title "The Ballpark at Union Station" were released to the public on October 11, 1996, where Astros President Tal Smith was open about his suggestions for the stadium including the location of the flagpole in center field and a traditional dirt path from the pitcher's mound to home plate.  While the dirt path was not implemented, the flagpole idea became known as "Tal's Hill" and remained a signature feature of the ballpark until 2016.
The design of the new park integrated the former Union Station building's main concourse, reutilizing the space for a clubhouse, cafe, team store, and office space. A large model train was also included within the park's design as an homage to the station.
In late 1997, it was announced that local Brown & Root would manage construction of the stadium, while Populous with Walter P. Moore would design it. The electrification of Minute Maid Park's retractable roof was developed by VAHLE, Inc.Groundbreaking for The Ballpark at Union Station was on October 30, 1997. Its groundbreaking ceremony was attended by Enron CEO Kenneth Lay, Houston Mayor Bob Lanier, Astros owner Drayton McLane, Harris County Judge Robert Eckles, Harris County Commissioner El Franco Lee, and Harris County-Houston Sports Authority Chairman Jack Rains.
Statues of longtime Astros players Jeff Bagwell and Craig Biggio are located in the exterior of the ballpark in a space known as The Plaza at Minute Maid Park. The two former teammates are depicted playing baseball with each other. The plaza also displays pennants for all Astros division and league championships, as well as two World Series titles. There are also several plaques to commemorate notable Astros and their achievements.