The architects of the building were Fred W. Clark & Edwin B. Clarke, whose firm also designed the Clifton Hill and Sherman Elementary Schools in Omaha.
The five-winged building and large athletic field occupied three city blocks between Burt and Cuming Streets, from 30th to 33rd Streets in North Omaha. The new school opened on October 15, 1923, with nearly 2,400 pupils. By 1940 enrollment had reached 3,684.
As a high school focused on technical education, Tech had many amenities designed to teach students in specific areas. It had two large gymnasiums and a swimming pool, which was for many years the only pool in any Omaha public school. The roof of the building featured a deck with a canopy that housed an exercise area.
An entire floor was dedicated to classrooms for home economics. There were extensive wood and metal shops, as well as scientific laboratories and a greenhouse. The building had 124 rooms. As early as 1947, there were 2,700 students and 100 teachers. Developed with high academic standards, the school was a forerunner in vocational high schools by offering students who largely chose not to go to college the opportunity to learn a trade or profession.
There was a high school radio station at Tech in the 1920s, whose call letters were KFOX.