A new wing was added in early 1980 to provide additional space for the arts, with a large room for orchestra and music and another for studio art.
Filling in the previously open east side of the courtyard, the design is nearly identical in design to the original school, built of red and white-washed brick with a cloister on the courtyard side.
The Gatehouse, which was built in 1929 and had served as the headmaster's residence, was remodeled to house the early childhood program in 1988.

Increased enrollment in the late 1980s and the need for more space led to another addition in 1992.
This addition included a new 17,500-volume library, a 16-station computer lab, and a 236-seat Performing Arts Center (PAC).
Moravian tiles around the new foyer fireplace and library doors pay homage to the original building.
The PAC "is known for its excellent acoustics", and hosts student productions and outside artistic groups, including the Beck Institute for the Arts, which stages musical recitals there.

Avery Coonley added a full-day kindergarten program in 2005, again requiring more space, and a $4 million, 15,000-square-foot (1,400 m²) middle school wing was constructed, financed through tax-exempt bonds from the Village of Downers Grove.
Its cream and red bricks, hipped roof, deep eaves, and detailed brickwork harmonize with the style of the earlier building.
The project added modernized math and science labs, two computer labs, and seven wireless classrooms using tablet computer technology, videoconferencing, and computer controlled overhead projectors.
A new wing was added in early 1980 to provide additional space for the arts, with a large room for orchestra and music and another for studio art. Filling in the previously open east side of the courtyard, the design is nearly identical in design to the original school, built of red and white-washed brick with a cloister on the courtyard side. The Gatehouse, which was built in 1929 and had served as the headmaster's residence, was remodeled to house the early childhood program in 1988.
Increased enrollment in the late 1980s and the need for more space led to another addition in 1992. This addition included a new 17,500-volume library, a 16-station computer lab, and a 236-seat Performing Arts Center (PAC). Moravian tiles around the new foyer fireplace and library doors pay homage to the original building. The PAC "is known for its excellent acoustics", and hosts student productions and outside artistic groups, including the Beck Institute for the Arts, which stages musical recitals there.
Avery Coonley added a full-day kindergarten program in 2005, again requiring more space, and a $4 million, 15,000-square-foot (1,400 m²) middle school wing was constructed, financed through tax-exempt bonds from the Village of Downers Grove. Its cream and red bricks, hipped roof, deep eaves, and detailed brickwork harmonize with the style of the earlier building. The project added modernized math and science labs, two computer labs, and seven wireless classrooms using tablet computer technology, videoconferencing, and computer controlled overhead projectors.
Avery Coonley School