In the following decade the school began to expand its facilities to accommodate a growing student body.

From the original 16 choristers, Grace has grown to its current enrollment of more than 725 students drawn from a wide variety of ethnic, economic, and religious backgrounds.

[7] While the school has continued its close relationship with Grace Church, since 1972 it has been governed by an independent Board of Trustees, and it is a fully accredited member of the New York State Association of Independent Schools and the National Association of Independent Schools.

[8] In 2015, Grace Church School introduced "antiracist" language into its curriculums.

[6] A rooftop addition by MBB Architects provided a 14,000 square foot gymnasium and athletic center.