It is a three-story building on Lincoln Way East between Wenger and Gernhart Streets covering four square blocks including the track and football field.

The auditorium was finished in 1925, just in time for the seniors to present their play, and the cafeteria was completed only a few weeks before the summer vacation.

The original gym was remodeled in 1959 to accommodate two full-sized gymnasium floors and provide a total seating capacity of 4,000.

The present shrubbery in the foreground of the building was a joint effort in graduating classes and the student council contributions.

A four-year renovation project (1976–1980) has resulted in an extensive modernization of the indoor and outdoor facilities of the high school.

Major areas of improvement included the auditorium, the cafeteria, the gymnasium, the library, the administrative offices, the industrial education wing, the hallways, the classrooms, and the stadium.

The industrial technology portion of the facility houses a manufacturing lab where students learn about hydraulics, pneumatics, C-N-C lathes, and milling machines.

The industrial technology wing also features a CAD (computer-aided design) lab where students are taught drafting skills with the aid of a computer.

As a result of the new construction, Mishawaka High School now totals 319,949 square feet (29,724.2 m2) and sits on 16.36 acres (66,200 m2).