The Main Academic Building is comprised of the following: Founders Hall, O'Shaughnessy Hall, Garberg (Military) Wing, Middle School and Flynn Hall. The school features three gymnasiums and an indoor pool.
The main Gymnasium is located in Vincent J. Flynn Hall, which opened to the public in 2013. The nearly 100,000-square-foot building was designed and built by Opus Design-Build LLC, and includes a fine arts center, classrooms, state of the art athletic facilities and meeting areas for faculty and administration. The space is named after esteemed alumnus, author, parent and former trustee, Vince Flynn ’84, who passed away in June of 2013. Flynn also co-chaired the capital campaign to construct the new building and was a benefactor of the Academy.
Gerry Brown Stadium, built in 1994 is named after alumnus, Gerry Brown, a former cadet football player and coach. Brown coached football at Saint Thomas Academy for 21 years, baseball for eight years, and track and field for five years. He also served as the Athletic Director for six years and as an Academy instructor. In 2000, he received the Myser Family Foundation Award for Teaching Excellence, and in 2004, he received the Edward G. Hames Alumni Honors Award, an award voted on by presidents of the Alumni Association.
The Saint Thomas Academy Baseball fields were built in conjunction with the school in 1965. In 2012, the state of the art scoreboard was funded largely in part by Joe Jensen in honor of his late son and Academy alumnus, Jack Jensen ’73.
The Saint Thomas Academy Track, a 400 meter, eight-lane, all-weather facility, is named after 2010 Honorary Alumnus, William J. Culbertson. Culbertson has held many positions over the years, including: Teacher, Coach, Dean of Students, and College Counselor. Culbertson is member of the Saint Thomas Academy Athletic Hall of Fame.
The Saint Thomas Ice Arena is located just across the street from the main campus of Saint Thomas Academy. This state of the art arena, is home to the Saint Thomas Academy Cadet Hockey Program and the University of Saint Thomas Men's and Women's hockey programs.
The Grotto opened at Saint Thomas Academy in 1999/2000 and was redone in 2013, 2014, and 2015. Longtime teacher, Mr. Ziebarth has transformed the Grotto over the years into a beautiful garden for the students and faculty of Saint Thomas Academy to enjoy.