The school's main building was constructed in 1971 from a modern architectural design by
Earl Flansburgh & Associates under the direction of then Headmaster Robert S. Hurlbut Jr. Built of reinforced precast concrete as a stack of modular classroom and office spaces with wall-length windows for more natural illumination of rooms, it exemplifies the
brutalist concrete construction style pioneered by Swiss architect
Le Corbusier. But its brick wall accents and its preserved oaks and
Roxbury puddingstone outcroppings pay homage to historical New England building traditions and topography. The building features an inner courtyard with a "Space Churn" stainless steel mobile sculpture by
George Rickey, donated by a Park parent in 1971. In 1996, the West Building designed by Graham Gund and Associates, added two full-sized basketball courts, three modern science labs, and four classrooms to the school's facilities. In 2008, the school completed a major expansion and renovation of all of the Pre-kindergarten – grade 5 classrooms. A new wing houses Grade 4 & 5 classrooms, after-school program space, a conference room, and adjoins the newly renovated 5,400-square-foot library. In the fall of 2021, Park students returned to a transformed Upper Division learning environment. Summer construction focused on the dated and unrenovated classrooms on the fourth floor of the Main Building and an unused former locker room area on the first floor. ==Program==