The oldest nonsectarian independent school in the city, it serves students from pre-kindergarten through the twelfth grade and offers a college preparatory curriculum.

It was founded in 1764 by what is now Columbia University to teach future freshmen English, Greek, and Latin grammar.

Originally consisting of one building, it added five brownstones through its 1956 merger with the adjacent Leonard School for Girls.

One of the most illustrious headmasters during that period was Charles Anthon, one of America's earliest and most distinguished classical scholars.

During his tenure, the Grammar School provided over half the students to Columbia College's freshman class.

[7] In 1996, 36 West 93rd Street was completed, adding 42,500 square feet (3,950 m2) of space to the physical plant.

The new CGPS Middle School opened its doors to students in grades 5, 6 and 7 on Thursday, September 8, 2016.

New art studios as well as a new library, three science labs, a rooftop play yard and twelve classrooms have been added to the building.

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