In 1926, it became necessary to formulate plans for a new building that would accommodate a greater number of students seeking admission into the parish school.

The second floor of the building contained high school classrooms, science laboratories, and facilities for a commercial course.

The site for the new Lebanon Catholic High School was to be Assumption Hill; land on Chestnut Street purchased in 1949.

On April 9, 1956, the Most Reverend George L. Leech, Bishop of Harrisburg, created a diocesan institution out of what had been a parochial high school.

This meant that five other parishes would lend their support to the proposed new building, and thus a Board of Pastors was also created.

On October 11, 1959, the new Lebanon Catholic High School on Assumption Hill was dedicated by the Most Reverend Egidio Vagnozzi, Apostolic Delegate to the United States.

For the 1963/1964 school year, enrollment was 700 students, the highest figure in Lebanon Catholic’s history.

To accommodate this merger, modular classrooms were placed on the grounds to extend the upper floor space to house grades 3 – 6.

[4] Our Lady of the Cross School had plans to open in North Lebanon Township circa 2021, as a way of replacing LCS.