Started in an unused classroom of Immanuel Lutheran School with 18 students, it moved in 1904 to the former site of the Wisconsin Synod's seminary at 13th and Vine streets.

Recognizing that more space would be needed, it rented the frame building at 13th and Vine streets[A] that had formerly housed the Wisconsin Synod seminary.

The fall 1904 semester opened in the new location with 48 students, of which 10 were male, thereby making the high school co-educational.

The new brick building was dedicated in the autumn of 1908 and contained three regular classrooms and several other rooms, allowing for an enrollment of about 150.

In January 1922, The conference approved plans to build a large addition and borrowed $32,000 to start construction immediately while fundraising was conducted.

Several solutions were considered: transferring one class to the south side of Milwaukee, thereby establishing a second Lutheran high school; rebuilding the assembly hall; or finding classrooms elsewhere in the neighborhood.

[17] To handle the increase, the gymnasium was converted into four classrooms, and physical training and some athletics were transferred to the Lutheran Center, which was a mile away.

[2] At the April 16, 1943, meeting of the Lutheran High School Conference, three options for handling the increased enrollment were discussed.

[19] About the same time that the need for a new high school had become a priority, doctrinal differences between the Missouri and Wisconsin synods were surfacing.

After much discussion, the conference decided on December 11, 1951, that the best solution would be to divide into two associations, one for each synod, that would each build a new school.

[20] Twenty-seven Missouri Synod congregations formed "The Lutheran High School Association of Greater Milwaukee" on January 23, 1952.

The association obtained approximately 28 acres (11 ha) of land at 97th Street and West Grantosa Drive for the new Milwaukee Lutheran High School.

By May 1956, the music rooms and the gymnasium with its swimming pool had been completed, and the formal dedication occurred during the senior graduation ceremonies on May 6.

Accepting a donation of acreage north of Capitol Drive at about 100th Street would have required the latter option, so the offer was rejected and the convention looked for land in the middle of the city.

The Wisconsin Lutheran High School facility, including equipment, cost $2.25 million and was dedicated on September 21, 1959.

Until then the convention rented the old Lutheran High School facility after the departure of the Missouri Synod contingent.

[2] The old high school was subsequently sold to the city of Milwaukee, who built a fire station there,[2] and the proceeds were divided equally between the two groups.