The school moved into its landmark Manhattan building at 33 Central Park West in 1904. The entire school was located in that building until 1928 when the high school division (Fieldston) moved to its 18-acre (73,000 m²) campus on Fieldston Road in the exclusive Fieldston section of Riverdale; the Manhattan branch of the Lower School remained there, and in 1932 a second Lower School was opened on the Riverdale campus. In 2007, a new middle school was opened on the same Riverdale campus, for the 6th, 7th, and 8th grades.