In 1990, the Trustees voted to engage in its second capital campaign, this time adding 20,000 square feet of space to include additional classrooms, an elementary gymnasium, and a dedicated science and art space. Having finished this expansion, the School completed its first accreditation with the Association of Independent Maryland Schools
(AIMS) in 1993 and developed a long-range plan to chart the waters for the next decade. In 1998, with the approval to increase the student body to 250, planning began to add an additional 25,000 square feet of learning space, including new dedicated space for art, music, and science, new classrooms, a full-size gymnasium
and performing arts center, and a media center
. With this complex complete, the School could have the full complement of two sections per grade, from prekindergarten through eighth grade. The following year, the School purchased 28 acres across the street from the School, which include farmland, trees, and a stream.