 This arrangement continued until, by 1957, increases in enrollment called for the accommodation of 450 boys.It was decided, therefore, to discontinue all of the departments except McBurney and the Evening High School and to prepare in 15 West 63rd street a proper setting for a college preparatory school.In September, 1958, the first part of the renovation was finished, and the building at 15 West 63rd Street was ready for McBurney use."