Pacelli expanded again in 1999, with new additions including a fully equipped science lab, updated art studio, renovated kitchen and faculty dining facilities, and new building for administrative offices connected to St. Anne School.

Pacelli and St. Anne School operate in a unified manner, sharing office workers, admission directors, and other employees.

In 2011, the Nathan Rustin Fitness Center was completely renovated, and additions included new high quality weight lifting and exercise equipment.

[8] In May 2012, a donation from the Sisters of Mercy prompted a major renovation of the Pacelli media center/library, which was completed at the end of 2012.

It offers AP classes in American Government, Biology, Calculus, Chemistry, English Literature, Microeconomics, Statistics, Studio Art, and United States History.

[2] No strict core curriculum exists, but ninth and tenth graders are offered limited flexibility in their courses.

Students must take one core course each year in English, math, science, social studies, and religion.

[2] Each year, students must complete community service projects as part of religion class.

Although Pacelli plays Brookstone in all of their sports, the most popular rivalry is their yearly football game, dubbed the "Battle for the Jug".